1056 lines
34 KiB
PHP
1056 lines
34 KiB
PHP
<?php
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/**
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* Abstract database connectivity class.
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* Sub-classes of this implement the actual database connection libraries
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* @package framework
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* @subpackage model
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*/
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abstract class SS_Database {
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/**
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* @config
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* @var boolean Check tables when running /dev/build, and repair them if necessary.
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* In case of large databases or more fine-grained control on how to handle
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* data corruption in tables, you can disable this behaviour and handle it
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* outside of this class, e.g. through a nightly system task with extended logging capabilities.
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*/
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private static $check_and_repair_on_build = true;
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/**
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* If this is false, then information about database operations
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* will be displayed, eg creation of tables.
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*
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* @param boolean
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*/
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protected $supressOutput = false;
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/**
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* Execute the given SQL query.
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* This abstract function must be defined by subclasses as part of the actual implementation.
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* It should return a subclass of SS_Query as the result.
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* @param string $sql The SQL query to execute
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* @param int $errorLevel The level of error reporting to enable for the query
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* @return SS_Query
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*/
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abstract public function query($sql, $errorLevel = E_USER_ERROR);
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/**
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* Get the autogenerated ID from the previous INSERT query.
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* @return int
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*/
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abstract public function getGeneratedID($table);
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/**
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* Check if the connection to the database is active.
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* @return boolean
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*/
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abstract public function isActive();
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/**
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* Create the database and connect to it. This can be called if the
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* initial database connection is not successful because the database
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* does not exist.
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*
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* It takes no parameters, and should create the database from the information
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* specified in the constructor.
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*
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* @return boolean Returns true if successful
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*/
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abstract public function createDatabase();
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/**
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* Build the connection string from input
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* @param array $parameters The connection details
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* @return string $connect The connection string
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**/
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abstract public function getConnect($parameters);
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/**
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* Create a new table.
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* @param $tableName The name of the table
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* @param $fields A map of field names to field types
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* @param $indexes A map of indexes
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* @param $options An map of additional options. The available keys are as follows:
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* - 'MSSQLDatabase'/'MySQLDatabase'/'PostgreSQLDatabase' - database-specific options such as "engine" for MySQL.
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* - 'temporary' - If true, then a temporary table will be created
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* @return The table name generated. This may be different from the table name, for example with temporary tables.
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*/
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abstract public function createTable($table, $fields = null, $indexes = null, $options = null,
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$advancedOptions = null);
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/**
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* Alter a table's schema.
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*/
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abstract public function alterTable($table, $newFields = null, $newIndexes = null, $alteredFields = null,
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$alteredIndexes = null, $alteredOptions=null, $advancedOptions=null);
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/**
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* Rename a table.
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* @param string $oldTableName The old table name.
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* @param string $newTableName The new table name.
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*/
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abstract public function renameTable($oldTableName, $newTableName);
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/**
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* Create a new field on a table.
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* @param string $table Name of the table.
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* @param string $field Name of the field to add.
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* @param string $spec The field specification, eg 'INTEGER NOT NULL'
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*/
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abstract public function createField($table, $field, $spec);
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/**
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* Change the database column name of the given field.
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*
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* @param string $tableName The name of the tbale the field is in.
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* @param string $oldName The name of the field to change.
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* @param string $newName The new name of the field
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*/
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abstract public function renameField($tableName, $oldName, $newName);
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/**
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* Get a list of all the fields for the given table.
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* Returns a map of field name => field spec.
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* @param string $table The table name.
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* @return array
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*/
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abstract protected function fieldList($table);
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/**
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* Returns a list of all tables in the database.
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* Keys are table names in lower case, values are table names in case that
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* database expects.
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* @return array
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*/
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/**
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*
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* This is a stub function. Postgres caches the fieldlist results.
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*
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* @param string $tableName
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*
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* @return boolean
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*/
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public function clearCachedFieldlist($tableName=false){
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return true;
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}
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abstract protected function tableList();
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/**
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* Returns true if the given table exists in the database
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*/
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abstract public function hasTable($tableName);
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/**
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* Returns the enum values available on the given field
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*/
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abstract public function enumValuesForField($tableName, $fieldName);
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/**
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* Returns an escaped string.
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*
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* @param string
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* @return string - escaped string
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*/
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abstract public function addslashes($val);
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/**
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* The table list, generated by the tableList() function.
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* Used by the requireTable() function.
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* @var array
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*/
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protected $tableList;
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/**
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* The field list, generated by the fieldList() function.
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* An array of maps of field name => field spec, indexed
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* by table name.
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* @var array
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*/
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protected $fieldList;
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/**
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* The index list for each table, generated by the indexList() function.
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* An map from table name to an array of index names.
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* @var array
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*/
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protected $indexList;
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/**
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* Keeps track whether we are currently updating the schema.
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*/
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protected $schemaIsUpdating = false;
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/**
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* Large array structure that represents a schema update transaction
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*/
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protected $schemaUpdateTransaction;
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/**
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* Start a schema-updating transaction.
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* All calls to requireTable/Field/Index will keep track of the changes requested, but not actually do anything.
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* Once
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*/
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public function beginSchemaUpdate() {
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$this->schemaIsUpdating = true;
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$this->tableList = array();
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$tables = $this->tableList();
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foreach($tables as $table) $this->tableList[strtolower($table)] = $table;
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$this->indexList = null;
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$this->fieldList = null;
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$this->schemaUpdateTransaction = array();
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}
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/**
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* Completes a schema-updated transaction, executing all the schema chagnes.
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*/
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public function endSchemaUpdate() {
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foreach($this->schemaUpdateTransaction as $tableName => $changes) {
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switch($changes['command']) {
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case 'create':
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$this->createTable($tableName, $changes['newFields'], $changes['newIndexes'], $changes['options'],
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isset($changes['advancedOptions']) ? $changes['advancedOptions'] : null
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);
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break;
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case 'alter':
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$this->alterTable($tableName, $changes['newFields'], $changes['newIndexes'],
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$changes['alteredFields'], $changes['alteredIndexes'], $changes['alteredOptions'],
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isset($changes['advancedOptions']) ? $changes['advancedOptions'] : null
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);
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break;
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}
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}
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$this->schemaUpdateTransaction = null;
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$this->schemaIsUpdating = false;
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}
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/**
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* Cancels the schema updates requested after a beginSchemaUpdate() call.
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*/
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public function cancelSchemaUpdate() {
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$this->schemaUpdateTransaction = null;
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$this->schemaIsUpdating = false;
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}
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/**
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* Returns true if we are during a schema update.
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*/
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function isSchemaUpdating() {
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return $this->schemaIsUpdating;
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}
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/**
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* Returns true if schema modifications were requested after a beginSchemaUpdate() call.
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*/
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public function doesSchemaNeedUpdating() {
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return (bool)$this->schemaUpdateTransaction;
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}
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// Transactional schema altering functions - they don't do anyhting except for update schemaUpdateTransaction
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/**
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* @param string $table
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* @param string $options
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*/
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public function transCreateTable($table, $options = null, $advanced_options = null) {
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$this->schemaUpdateTransaction[$table] = array(
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'command' => 'create',
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'newFields' => array(),
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'newIndexes' => array(),
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'options' => $options,
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'advancedOptions' => $advanced_options
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);
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}
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/**
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* @param string $table
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* @param array $options
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*/
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public function transAlterTable($table, $options, $advanced_options) {
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$this->transInitTable($table);
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$this->schemaUpdateTransaction[$table]['alteredOptions'] = $options;
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$this->schemaUpdateTransaction[$table]['advancedOptions'] = $advanced_options;
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}
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public function transCreateField($table, $field, $schema) {
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$this->transInitTable($table);
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$this->schemaUpdateTransaction[$table]['newFields'][$field] = $schema;
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}
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public function transCreateIndex($table, $index, $schema) {
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$this->transInitTable($table);
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$this->schemaUpdateTransaction[$table]['newIndexes'][$index] = $schema;
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}
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public function transAlterField($table, $field, $schema) {
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$this->transInitTable($table);
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$this->schemaUpdateTransaction[$table]['alteredFields'][$field] = $schema;
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}
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public function transAlterIndex($table, $index, $schema) {
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$this->transInitTable($table);
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$this->schemaUpdateTransaction[$table]['alteredIndexes'][$index] = $schema;
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}
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/**
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* Handler for the other transXXX methods - mark the given table as being altered
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* if it doesn't already exist
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*/
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protected function transInitTable($table) {
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if(!isset($this->schemaUpdateTransaction[$table])) {
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$this->schemaUpdateTransaction[$table] = array(
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'command' => 'alter',
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'newFields' => array(),
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'newIndexes' => array(),
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'alteredFields' => array(),
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'alteredIndexes' => array(),
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'alteredOptions' => ''
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);
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}
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}
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/**
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* Generate the following table in the database, modifying whatever already exists
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* as necessary.
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* @todo Change detection for CREATE TABLE $options other than "Engine"
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*
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* @param string $table The name of the table
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* @param string $fieldSchema A list of the fields to create, in the same form as DataObject::$db
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* @param string $indexSchema A list of indexes to create. See {@link requireIndex()}
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* @param array $options
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*/
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public function requireTable($table, $fieldSchema = null, $indexSchema = null, $hasAutoIncPK=true,
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$options = Array(), $extensions=false) {
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if(!isset($this->tableList[strtolower($table)])) {
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$this->transCreateTable($table, $options, $extensions);
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$this->alterationMessage("Table $table: created","created");
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} else {
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if(Config::inst()->get('SS_Database', 'check_and_repair_on_build')) {
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$this->checkAndRepairTable($table, $options);
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}
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// Check if options changed
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$tableOptionsChanged = false;
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if(isset($options[get_class($this)]) || true) {
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if(isset($options[get_class($this)])) {
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if(preg_match('/ENGINE=([^\s]*)/', $options[get_class($this)], $alteredEngineMatches)) {
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$alteredEngine = $alteredEngineMatches[1];
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$tableStatus = DB::query(sprintf(
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'SHOW TABLE STATUS LIKE \'%s\'',
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$table
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))->first();
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$tableOptionsChanged = ($tableStatus['Engine'] != $alteredEngine);
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}
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}
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}
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if($tableOptionsChanged || ($extensions && DB::getConn()->supportsExtensions()))
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$this->transAlterTable($table, $options, $extensions);
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}
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//DB ABSTRACTION: we need to convert this to a db-specific version:
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$this->requireField($table, 'ID', DB::getConn()->IdColumn(false, $hasAutoIncPK));
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// Create custom fields
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if($fieldSchema) {
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foreach($fieldSchema as $fieldName => $fieldSpec) {
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//Is this an array field?
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$arrayValue='';
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if(strpos($fieldSpec, '[')!==false){
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//If so, remove it and store that info separately
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$pos=strpos($fieldSpec, '[');
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$arrayValue=substr($fieldSpec, $pos);
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$fieldSpec=substr($fieldSpec, 0, $pos);
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}
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$fieldObj = Object::create_from_string($fieldSpec, $fieldName);
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$fieldObj->arrayValue=$arrayValue;
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$fieldObj->setTable($table);
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$fieldObj->requireField();
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}
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}
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// Create custom indexes
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if($indexSchema) {
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foreach($indexSchema as $indexName => $indexDetails) {
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$this->requireIndex($table, $indexName, $indexDetails);
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}
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}
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}
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/**
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* If the given table exists, move it out of the way by renaming it to _obsolete_(tablename).
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* @param string $table The table name.
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*/
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public function dontRequireTable($table) {
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if(isset($this->tableList[strtolower($table)])) {
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$suffix = '';
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while(isset($this->tableList[strtolower("_obsolete_{$table}$suffix")])) {
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$suffix = $suffix ? ($suffix+1) : 2;
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}
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$this->renameTable($table, "_obsolete_{$table}$suffix");
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$this->alterationMessage("Table $table: renamed to _obsolete_{$table}$suffix","obsolete");
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}
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}
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/**
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* Generate the given index in the database, modifying whatever already exists as necessary.
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*
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* The keys of the array are the names of the index.
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* The values of the array can be one of:
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* - true: Create a single column index on the field named the same as the index.
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* - array('type' => 'index|unique|fulltext', 'value' => 'FieldA, FieldB'): This gives you full
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* control over the index.
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*
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* @param string $table The table name.
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* @param string $index The index name.
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* @param string|boolean $spec The specification of the index. See requireTable() for more information.
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*/
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public function requireIndex($table, $index, $spec) {
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$newTable = false;
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//DB Abstraction: remove this ===true option as a possibility?
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if($spec === true) {
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$spec = "(\"$index\")";
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}
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//Indexes specified as arrays cannot be checked with this line: (it flattens out the array)
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if(!is_array($spec)) {
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$spec = preg_replace('/\s*,\s*/', ',', $spec);
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}
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if(!isset($this->tableList[strtolower($table)])) $newTable = true;
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if(!$newTable && !isset($this->indexList[$table])) {
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$this->indexList[$table] = $this->indexList($table);
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}
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//Fix up the index for database purposes
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$index=DB::getConn()->getDbSqlDefinition($table, $index, null, true);
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//Fix the key for database purposes
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$index_alt=DB::getConn()->modifyIndex($index, $spec);
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if(!$newTable) {
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if(isset($this->indexList[$table][$index_alt])) {
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if(is_array($this->indexList[$table][$index_alt])) {
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$array_spec = $this->indexList[$table][$index_alt]['spec'];
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} else {
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$array_spec = $this->indexList[$table][$index_alt];
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}
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}
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}
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if($newTable || !isset($this->indexList[$table][$index_alt])) {
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$this->transCreateIndex($table, $index, $spec);
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$this->alterationMessage("Index $table.$index: created as "
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. DB::getConn()->convertIndexSpec($spec),"created");
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} else if($array_spec != DB::getConn()->convertIndexSpec($spec)) {
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$this->transAlterIndex($table, $index, $spec);
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$spec_msg=DB::getConn()->convertIndexSpec($spec);
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$this->alterationMessage("Index $table.$index: changed to $spec_msg"
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. " <i style=\"color: #AAA\">(from {$array_spec})</i>","changed");
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}
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}
|
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|
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/**
|
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* Return true if the table exists and already has a the field specified
|
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* @param string $tableName - The table to check
|
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* @param string $fieldName - The field to check
|
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* @return bool - True if the table exists and the field exists on the table
|
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*/
|
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public function hasField($tableName, $fieldName) {
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if (!$this->hasTable($tableName)) return false;
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$fields = $this->fieldList($tableName);
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return array_key_exists($fieldName, $fields);
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}
|
|
|
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/**
|
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* Generate the given field on the table, modifying whatever already exists as necessary.
|
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* @param string $table The table name.
|
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* @param string $field The field name.
|
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* @param array|string $spec The field specification. If passed in array syntax, the specific database
|
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* driver takes care of the ALTER TABLE syntax. If passed as a string, its assumed to
|
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* be prepared as a direct SQL framgment ready for insertion into ALTER TABLE. In this case you'll
|
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* need to take care of database abstraction in your DBField subclass.
|
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*/
|
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public function requireField($table, $field, $spec) {
|
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//TODO: this is starting to get extremely fragmented.
|
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//There are two different versions of $spec floating around, and their content changes depending
|
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//on how they are structured. This needs to be tidied up.
|
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$fieldValue = null;
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$newTable = false;
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|
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// backwards compatibility patch for pre 2.4 requireField() calls
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$spec_orig=$spec;
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if(!is_string($spec)) {
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$spec['parts']['name'] = $field;
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$spec_orig['parts']['name'] = $field;
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//Convert the $spec array into a database-specific string
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$spec=DB::getConn()->$spec['type']($spec['parts'], true);
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}
|
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|
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// Collations didn't come in until MySQL 4.1. Anything earlier will throw a syntax error if you try and use
|
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// collations.
|
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// TODO: move this to the MySQLDatabase file, or drop it altogether?
|
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if(!$this->supportsCollations()) {
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$spec = preg_replace('/ *character set [^ ]+( collate [^ ]+)?( |$)/', '\\2', $spec);
|
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}
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if(!isset($this->tableList[strtolower($table)])) $newTable = true;
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if(!$newTable && !isset($this->fieldList[$table])) {
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$this->fieldList[$table] = $this->fieldList($table);
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}
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if(is_array($spec)) {
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$specValue = DB::getConn()->$spec_orig['type']($spec_orig['parts']);
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} else {
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$specValue = $spec;
|
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}
|
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|
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// We need to get db-specific versions of the ID column:
|
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if($spec_orig==DB::getConn()->IdColumn() || $spec_orig==DB::getConn()->IdColumn(true))
|
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$specValue=DB::getConn()->IdColumn(true);
|
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|
|
if(!$newTable) {
|
|
if(isset($this->fieldList[$table][$field])) {
|
|
if(is_array($this->fieldList[$table][$field])) {
|
|
$fieldValue = $this->fieldList[$table][$field]['data_type'];
|
|
} else {
|
|
$fieldValue = $this->fieldList[$table][$field];
|
|
}
|
|
}
|
|
}
|
|
|
|
// Get the version of the field as we would create it. This is used for comparison purposes to see if the
|
|
// existing field is different to what we now want
|
|
if(is_array($spec_orig)) {
|
|
$spec_orig=DB::getConn()->$spec_orig['type']($spec_orig['parts']);
|
|
}
|
|
|
|
if($newTable || $fieldValue=='') {
|
|
$this->transCreateField($table, $field, $spec_orig);
|
|
$this->alterationMessage("Field $table.$field: created as $spec_orig","created");
|
|
} else if($fieldValue != $specValue) {
|
|
// If enums/sets are being modified, then we need to fix existing data in the table.
|
|
// Update any records where the enum is set to a legacy value to be set to the default.
|
|
// One hard-coded exception is SiteTree - the default for this is Page.
|
|
foreach(array('enum','set') as $enumtype) {
|
|
if(preg_match("/^$enumtype/i",$specValue)) {
|
|
$newStr = preg_replace("/(^$enumtype\s*\(')|('$\).*)/i","",$spec_orig);
|
|
$new = preg_split("/'\s*,\s*'/", $newStr);
|
|
|
|
$oldStr = preg_replace("/(^$enumtype\s*\(')|('$\).*)/i","", $fieldValue);
|
|
$old = preg_split("/'\s*,\s*'/", $newStr);
|
|
|
|
$holder = array();
|
|
foreach($old as $check) {
|
|
if(!in_array($check, $new)) {
|
|
$holder[] = $check;
|
|
}
|
|
}
|
|
if(count($holder)) {
|
|
$default = explode('default ', $spec_orig);
|
|
$default = $default[1];
|
|
if($default == "'SiteTree'") $default = "'Page'";
|
|
$query = "UPDATE \"$table\" SET $field=$default WHERE $field IN (";
|
|
for($i=0;$i+1<count($holder);$i++) {
|
|
$query .= "'{$holder[$i]}', ";
|
|
}
|
|
$query .= "'{$holder[$i]}')";
|
|
DB::query($query);
|
|
$amount = DB::affectedRows();
|
|
$this->alterationMessage("Changed $amount rows to default value of field $field"
|
|
. " (Value: $default)");
|
|
}
|
|
}
|
|
}
|
|
$this->transAlterField($table, $field, $spec_orig);
|
|
$this->alterationMessage(
|
|
"Field $table.$field: changed to $specValue <i style=\"color: #AAA\">(from {$fieldValue})</i>",
|
|
"changed"
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* If the given field exists, move it out of the way by renaming it to _obsolete_(fieldname).
|
|
*
|
|
* @param string $table
|
|
* @param string $fieldName
|
|
*/
|
|
public function dontRequireField($table, $fieldName) {
|
|
$fieldList = $this->fieldList($table);
|
|
if(array_key_exists($fieldName, $fieldList)) {
|
|
$suffix = '';
|
|
while(isset($fieldList[strtolower("_obsolete_{$fieldName}$suffix")])) {
|
|
$suffix = $suffix ? ($suffix+1) : 2;
|
|
}
|
|
$this->renameField($table, $fieldName, "_obsolete_{$fieldName}$suffix");
|
|
$this->alterationMessage("Field $table.$fieldName: renamed to $table._obsolete_{$fieldName}$suffix",
|
|
"obsolete");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Execute a complex manipulation on the database.
|
|
* A manipulation is an array of insert / or update sequences. The keys of the array are table names,
|
|
* and the values are map containing 'command' and 'fields'. Command should be 'insert' or 'update',
|
|
* and fields should be a map of field names to field values, including quotes. The field value can
|
|
* also be a SQL function or similar.
|
|
* @param array $manipulation
|
|
*/
|
|
public function manipulate($manipulation) {
|
|
if($manipulation) foreach($manipulation as $table => $writeInfo) {
|
|
|
|
if(isset($writeInfo['fields']) && $writeInfo['fields']) {
|
|
$fieldList = $columnList = $valueList = array();
|
|
foreach($writeInfo['fields'] as $fieldName => $fieldVal) {
|
|
$fieldList[] = "\"$fieldName\" = $fieldVal";
|
|
$columnList[] = "\"$fieldName\"";
|
|
|
|
// Empty strings inserted as null in INSERTs. Replacement of SS_Database::replace_with_null().
|
|
if($fieldVal === "''") $valueList[] = "null";
|
|
else $valueList[] = $fieldVal;
|
|
}
|
|
|
|
if(!isset($writeInfo['where']) && isset($writeInfo['id'])) {
|
|
$writeInfo['where'] = "\"ID\" = " . (int)$writeInfo['id'];
|
|
}
|
|
|
|
switch($writeInfo['command']) {
|
|
case "update":
|
|
// Test to see if this update query shouldn't, in fact, be an insert
|
|
if($this->query("SELECT \"ID\" FROM \"$table\" WHERE $writeInfo[where]")->value()) {
|
|
$fieldList = implode(", ", $fieldList);
|
|
$sql = "UPDATE \"$table\" SET $fieldList where $writeInfo[where]";
|
|
$this->query($sql);
|
|
break;
|
|
}
|
|
|
|
// ...if not, we'll skip on to the insert code
|
|
|
|
case "insert":
|
|
if(!isset($writeInfo['fields']['ID']) && isset($writeInfo['id'])) {
|
|
$columnList[] = "\"ID\"";
|
|
$valueList[] = (int)$writeInfo['id'];
|
|
}
|
|
|
|
$columnList = implode(", ", $columnList);
|
|
$valueList = implode(", ", $valueList);
|
|
$sql = "INSERT INTO \"$table\" ($columnList) VALUES ($valueList)";
|
|
$this->query($sql);
|
|
break;
|
|
|
|
default:
|
|
$sql = null;
|
|
user_error("SS_Database::manipulate() Can't recognise command '$writeInfo[command]'",
|
|
E_USER_ERROR);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Replaces "\'\'" with "null", recursively walks through the given array.
|
|
* @param string $array Array where the replacement should happen
|
|
*/
|
|
public static function replace_with_null(&$array) {
|
|
$array = preg_replace('/= *\'\'/', '= null', $array);
|
|
|
|
if(is_array($array)) {
|
|
foreach($array as $key => $value) {
|
|
if(is_array($value)) {
|
|
array_walk($array, array(SS_Database, 'replace_with_null'));
|
|
}
|
|
}
|
|
}
|
|
|
|
return $array;
|
|
}
|
|
|
|
/**
|
|
* Error handler for database errors.
|
|
* All database errors will call this function to report the error. It isn't a static function;
|
|
* it will be called on the object itself and as such can be overridden in a subclass.
|
|
* @todo hook this into a more well-structured error handling system.
|
|
* @param string $msg The error message.
|
|
* @param int $errorLevel The level of the error to throw.
|
|
*/
|
|
public function databaseError($msg, $errorLevel = E_USER_ERROR) {
|
|
user_error($msg, $errorLevel);
|
|
}
|
|
|
|
/**
|
|
* Enable supression of database messages.
|
|
*/
|
|
public function quiet() {
|
|
$this->supressOutput = true;
|
|
}
|
|
|
|
/**
|
|
* Show a message about database alteration
|
|
*
|
|
* @param string message to display
|
|
* @param string type one of [created|changed|repaired|obsolete|deleted|error]
|
|
*/
|
|
public function alterationMessage($message,$type=""){
|
|
if(!$this->supressOutput) {
|
|
if(Director::is_cli()) {
|
|
switch ($type){
|
|
case "created":
|
|
case "changed":
|
|
case "repaired":
|
|
$sign = "+";
|
|
break;
|
|
case "obsolete":
|
|
case "deleted":
|
|
$sign = '-';
|
|
break;
|
|
case "error":
|
|
$sign = "!";
|
|
break;
|
|
default:
|
|
$sign=" ";
|
|
}
|
|
$message = strip_tags($message);
|
|
echo " $sign $message\n";
|
|
} else {
|
|
switch ($type){
|
|
case "created":
|
|
$color = "green";
|
|
break;
|
|
case "obsolete":
|
|
$color = "red";
|
|
break;
|
|
case "error":
|
|
$color = "red";
|
|
break;
|
|
case "deleted":
|
|
$color = "red";
|
|
break;
|
|
case "changed":
|
|
$color = "blue";
|
|
break;
|
|
case "repaired":
|
|
$color = "blue";
|
|
break;
|
|
default:
|
|
$color="";
|
|
}
|
|
echo "<li style=\"color: $color\">$message</li>";
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the SELECT clauses ready for inserting into a query.
|
|
* Caution: Expects correctly quoted and escaped SQL fragments.
|
|
*
|
|
* @param array $select Select columns
|
|
* @param boolean $distinct Distinct select?
|
|
* @return string
|
|
*/
|
|
public function sqlSelectToString($select, $distinct = false) {
|
|
$clauses = array();
|
|
|
|
foreach($select as $alias => $field) {
|
|
// Don't include redundant aliases.
|
|
if($alias === $field || preg_match('/"' . preg_quote($alias) . '"$/', $field)) $clauses[] = $field;
|
|
else $clauses[] = "$field AS \"$alias\"";
|
|
}
|
|
|
|
$text = 'SELECT ';
|
|
if($distinct) $text .= 'DISTINCT ';
|
|
return $text .= implode(', ', $clauses);
|
|
}
|
|
|
|
/**
|
|
* Return the FROM clause ready for inserting into a query.
|
|
* Caution: Expects correctly quoted and escaped SQL fragments.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function sqlFromToString($from) {
|
|
return ' FROM ' . implode(' ', $from);
|
|
}
|
|
|
|
/**
|
|
* Returns the WHERE clauses ready for inserting into a query.
|
|
* Caution: Expects correctly quoted and escaped SQL fragments.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function sqlWhereToString($where, $connective) {
|
|
return ' WHERE (' . implode(") {$connective} (" , $where) . ')';
|
|
}
|
|
|
|
/**
|
|
* Returns the ORDER BY clauses ready for inserting into a query.
|
|
* Caution: Expects correctly quoted and escaped SQL fragments.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function sqlOrderByToString($orderby) {
|
|
$statements = array();
|
|
|
|
foreach($orderby as $clause => $dir) {
|
|
$statements[] = trim($clause . ' ' . $dir);
|
|
}
|
|
|
|
return ' ORDER BY ' . implode(', ', $statements);
|
|
}
|
|
|
|
/**
|
|
* Returns the GROUP BY clauses ready for inserting into a query.
|
|
* Caution: Expects correctly quoted and escaped SQL fragments.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function sqlGroupByToString($groupby) {
|
|
return ' GROUP BY ' . implode(', ', $groupby);
|
|
}
|
|
|
|
/**
|
|
* Returns the HAVING clauses ready for inserting into a query.
|
|
* Caution: Expects correctly quoted and escaped SQL fragments.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function sqlHavingToString($having) {
|
|
return ' HAVING ( ' . implode(' ) AND ( ', $having) . ')';
|
|
}
|
|
|
|
/**
|
|
* Return the LIMIT clause ready for inserting into a query.
|
|
* Caution: Expects correctly quoted and escaped SQL fragments.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function sqlLimitToString($limit) {
|
|
$clause = '';
|
|
|
|
// Pass limit as array or SQL string value
|
|
if(is_array($limit)) {
|
|
if(!array_key_exists('limit', $limit)) {
|
|
throw new InvalidArgumentException('Database::sqlLimitToString(): Wrong format for $limit: '
|
|
. var_export($limit, true));
|
|
}
|
|
|
|
if(isset($limit['start']) && is_numeric($limit['start']) && isset($limit['limit'])
|
|
&& is_numeric($limit['limit'])) {
|
|
|
|
$combinedLimit = $limit['start'] ? "$limit[limit] OFFSET $limit[start]" : "$limit[limit]";
|
|
} elseif(isset($limit['limit']) && is_numeric($limit['limit'])) {
|
|
$combinedLimit = (int)$limit['limit'];
|
|
} else {
|
|
$combinedLimit = false;
|
|
}
|
|
if(!empty($combinedLimit)) $clause .= ' LIMIT ' . $combinedLimit;
|
|
} else {
|
|
$clause .= ' LIMIT ' . $limit;
|
|
}
|
|
|
|
return $clause;
|
|
}
|
|
|
|
/**
|
|
* Convert a SQLQuery object into a SQL statement
|
|
* Caution: Expects correctly quoted and escaped SQL fragments.
|
|
*
|
|
* @param $query SQLQuery
|
|
*/
|
|
public function sqlQueryToString(SQLQuery $query) {
|
|
if($query->getDelete()) {
|
|
$text = 'DELETE ';
|
|
} else {
|
|
$text = $this->sqlSelectToString($query->getSelect(), $query->getDistinct());
|
|
}
|
|
|
|
if($query->getFrom()) $text .= $this->sqlFromToString($query->getFrom());
|
|
if($query->getWhere()) $text .= $this->sqlWhereToString($query->getWhere(), $query->getConnective());
|
|
|
|
// these clauses only make sense in SELECT queries, not DELETE
|
|
if(!$query->getDelete()) {
|
|
if($query->getGroupBy()) $text .= $this->sqlGroupByToString($query->getGroupBy());
|
|
if($query->getHaving()) $text .= $this->sqlHavingToString($query->getHaving());
|
|
if($query->getOrderBy()) $text .= $this->sqlOrderByToString($query->getOrderBy());
|
|
if($query->getLimit()) $text .= $this->sqlLimitToString($query->getLimit());
|
|
}
|
|
|
|
return $text;
|
|
}
|
|
|
|
/**
|
|
* Wrap a string into DB-specific quotes. MySQL, PostgreSQL and SQLite3 only need single quotes around the string.
|
|
* MSSQL will overload this and include it's own N prefix to mark the string as unicode, so characters like macrons
|
|
* are saved correctly.
|
|
*
|
|
* @param string $string String to be prepared for database query
|
|
* @return string Prepared string
|
|
*/
|
|
public function prepStringForDB($string) {
|
|
return "'" . Convert::raw2sql($string) . "'";
|
|
}
|
|
|
|
/**
|
|
* Generate a WHERE clause for text matching.
|
|
*
|
|
* @param String $field Quoted field name
|
|
* @param String $value Escaped search. Can include percentage wildcards.
|
|
* @param boolean $exact Exact matches or wildcard support.
|
|
* @param boolean $negate Negate the clause.
|
|
* @param boolean $caseSensitive Perform case sensitive search.
|
|
* @return String SQL
|
|
*/
|
|
abstract public function comparisonClause($field, $value, $exact = false, $negate = false, $caseSensitive = false);
|
|
|
|
/**
|
|
* function to return an SQL datetime expression that can be used with the adapter in use
|
|
* used for querying a datetime in a certain format
|
|
* @param string $date to be formated, can be either 'now', literal datetime like '1973-10-14 10:30:00' or
|
|
* field name, e.g. '"SiteTree"."Created"'
|
|
* @param string $format to be used, supported specifiers:
|
|
* %Y = Year (four digits)
|
|
* %m = Month (01..12)
|
|
* %d = Day (01..31)
|
|
* %H = Hour (00..23)
|
|
* %i = Minutes (00..59)
|
|
* %s = Seconds (00..59)
|
|
* %U = unix timestamp, can only be used on it's own
|
|
* @return string SQL datetime expression to query for a formatted datetime
|
|
*/
|
|
abstract public function formattedDatetimeClause($date, $format);
|
|
|
|
/**
|
|
* function to return an SQL datetime expression that can be used with the adapter in use
|
|
* used for querying a datetime addition
|
|
* @param string $date, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name,
|
|
* e.g. '"SiteTree"."Created"'
|
|
* @param string $interval to be added, use the format [sign][integer] [qualifier], e.g. -1 Day, +15 minutes,
|
|
* +1 YEAR
|
|
* supported qualifiers:
|
|
* - years
|
|
* - months
|
|
* - days
|
|
* - hours
|
|
* - minutes
|
|
* - seconds
|
|
* This includes the singular forms as well
|
|
* @return string SQL datetime expression to query for a datetime (YYYY-MM-DD hh:mm:ss) which is the result of
|
|
* the addition
|
|
*/
|
|
abstract public function datetimeIntervalClause($date, $interval);
|
|
|
|
/**
|
|
* function to return an SQL datetime expression that can be used with the adapter in use
|
|
* used for querying a datetime substraction
|
|
* @param string $date1, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name
|
|
* e.g. '"SiteTree"."Created"'
|
|
* @param string $date2 to be substracted of $date1, can be either 'now', literal datetime
|
|
* like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
|
|
* @return string SQL datetime expression to query for the interval between $date1 and $date2 in seconds which
|
|
* is the result of the substraction
|
|
*/
|
|
abstract public function datetimeDifferenceClause($date1, $date2);
|
|
|
|
/**
|
|
* Can the database override timezone as a connection setting,
|
|
* or does it use the system timezone exclusively?
|
|
*
|
|
* @return Boolean
|
|
*/
|
|
abstract public function supportsTimezoneOverride();
|
|
|
|
/*
|
|
* Does this database support transactions?
|
|
*
|
|
* @return boolean
|
|
*/
|
|
abstract public function supportsTransactions();
|
|
|
|
/*
|
|
* Start a prepared transaction
|
|
* See http://developer.postgresql.org/pgdocs/postgres/sql-set-transaction.html for details on
|
|
* transaction isolation options
|
|
*/
|
|
abstract public function transactionStart($transaction_mode=false, $session_characteristics=false);
|
|
|
|
/*
|
|
* Create a savepoint that you can jump back to if you encounter problems
|
|
*/
|
|
abstract public function transactionSavepoint($savepoint);
|
|
|
|
/*
|
|
* Rollback or revert to a savepoint if your queries encounter problems
|
|
* If you encounter a problem at any point during a transaction, you may
|
|
* need to rollback that particular query, or return to a savepoint
|
|
*/
|
|
abstract public function transactionRollback($savepoint=false);
|
|
|
|
/*
|
|
* Commit everything inside this transaction so far
|
|
*/
|
|
abstract public function transactionEnd();
|
|
|
|
/**
|
|
* Determines if the used database supports application-level locks,
|
|
* which is different from table- or row-level locking.
|
|
* See {@link getLock()} for details.
|
|
*
|
|
* @return boolean
|
|
*/
|
|
public function supportsLocks() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns if the lock is available.
|
|
* See {@link supportsLocks()} to check if locking is generally supported.
|
|
*
|
|
* @return Boolean
|
|
*/
|
|
public function canLock($name) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Sets an application-level lock so that no two processes can run at the same time,
|
|
* also called a "cooperative advisory lock".
|
|
*
|
|
* Return FALSE if acquiring the lock fails; otherwise return TRUE, if lock was acquired successfully.
|
|
* Lock is automatically released if connection to the database is broken (either normally or abnormally),
|
|
* making it less prone to deadlocks than session- or file-based locks.
|
|
* Should be accompanied by a {@link releaseLock()} call after the logic requiring the lock has completed.
|
|
* Can be called multiple times, in which case locks "stack" (PostgreSQL, SQL Server),
|
|
* or auto-releases the previous lock (MySQL).
|
|
*
|
|
* Note that this might trigger the database to wait for the lock to be released, delaying further execution.
|
|
*
|
|
* @param String
|
|
* @param Int Timeout in seconds
|
|
* @return Boolean
|
|
*/
|
|
public function getLock($name, $timeout = 5) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Remove an application-level lock file to allow another process to run
|
|
* (if the execution aborts (e.g. due to an error) all locks are automatically released).
|
|
*
|
|
* @param String
|
|
* @return Boolean
|
|
*/
|
|
public function releaseLock($name) {
|
|
return false;
|
|
}
|
|
}
|