mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
1bd388ee92
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@74337 467b73ca-7a2a-4603-9d3b-597d59a354a9
815 lines
24 KiB
PHP
Executable File
815 lines
24 KiB
PHP
Executable File
<?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 sapphire
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* @subpackage model
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*/
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abstract class Database extends Object {
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/**
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* Connection object to the database.
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* @param resource
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*/
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static $globalConn;
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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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* @param boolean
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*/
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public static $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 Query as the result.
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* @param string $sql The SQL query to execute
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* @param int $errorLevel The level of error reporting to enable for the query
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* @return Query
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*/
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abstract function query($sql, $errorLevel = E_USER_ERROR);
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/**
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* Get the autogenerated ID from the previous INSERT query.
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* @return int
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*/
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abstract function getGeneratedID($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 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 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 $connect The connection string
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**/
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abstract function getConnect($parameters);
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/**
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* Create a new table.
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* The table will have a single field - the integer key ID.
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* @param string $table Name of table to create.
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*/
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abstract function createTable($table, $fields = null, $indexes = null);
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/**
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* Alter a table's schema.
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*/
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abstract function alterTable($table, $newFields = null, $newIndexes = null, $alteredFields = null, $alteredIndexes = 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 $newTableName The new table name.
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*/
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abstract function renameTable($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 $spec The field specification, eg 'INTEGER NOT NULL'
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*/
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abstract function createField($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 $newName The new name of the field
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*/
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abstract function renameField($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 $table The table name.
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* @return array
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*/
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protected abstract function fieldList($table);
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/**
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* Returns a list of all tables in the database.
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* The table names will be in lower case.
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* @return array
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*/
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protected abstract 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 function hasTable($tableName);
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/**
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* Returns the enum values available on the given field
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*/
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abstract function enumValuesForField($tableName, $fieldName);
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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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* Large array structure that represents a schema update transaction
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*/
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protected $schemaUpdateTransaction;
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/**
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* Start a schema-updating transaction.
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* All calls to requireTable/Field/Index will keep track of the changes requested, but not actually do anything.
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* Once
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*/
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function beginSchemaUpdate() {
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$this->tableList = $this->tableList();
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$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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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'], $changes['newIndexes']);
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break;
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case 'alter':
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$this->alterTable($tableName, $changes['newFields'], $changes['newIndexes'],
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$changes['alteredFields'], $changes['alteredIndexes']);
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break;
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}
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}
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$this->schemaUpdateTransaction = null;
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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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function transCreateTable($table) {
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$this->schemaUpdateTransaction[$table] = array('command' => 'create', 'newFields' => array(), 'newIndexes' => array());
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}
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function transCreateField($table, $field, $schema) {
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$this->transInitTable($table);
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$this->schemaUpdateTransaction[$table]['newFields'][$field] = $schema;
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}
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function transCreateIndex($table, $index, $schema) {
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$this->transInitTable($table);
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$this->schemaUpdateTransaction[$table]['newIndexes'][$index] = $schema;
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}
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function transAlterField($table, $field, $schema) {
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$this->transInitTable($table);
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$this->schemaUpdateTransaction[$table]['alteredFields'][$field] = $schema;
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}
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function transAlterIndex($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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);
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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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* @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 $indexSchema A list of indexes to create. See {@link requireIndex()}
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*/
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function requireTable($table, $fieldSchema = null, $indexSchema = null, $hasAutoIncPK=true) {
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if(!isset($this->tableList[strtolower($table)])) {
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$this->transCreateTable($table);
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Database::alteration_message("Table $table: created","created");
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} else {
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$this->checkAndRepairTable($table);
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}
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//DB ABSTRACTION: we need to convert this to a db-specific version:
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$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 => $fieldSpec) {
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$fieldObj = eval(ViewableData::castingObjectCreator($fieldSpec));
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$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 $table The table name.
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*/
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function dontRequireTable($table) {
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if(!isset($this->tableList)) $this->tableList = $this->tableList();
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if(isset($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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Database::alteration_message("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 $spec The specification of the index. See requireTable() for more information.
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*/
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function requireIndex($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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$spec = ereg_replace(" *, *",",",$spec);
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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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Database::alteration_message("Index $table.$index: created as $spec","created");
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} else if($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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Database::alteration_message("Index $table.$index: changed to $spec_msg <i style=\"color: #AAA\">(from {$array_spec})</i>","changed");
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}
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}
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/**
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* 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 $spec The field specification. If passed in array syntax, the specific database
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* driver takes care of the ALTER TABLE syntax. If passed as a string, its assumed to
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* be prepared as a direct SQL framgment ready for insertion into ALTER TABLE. In this case you'll
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* need to take care of database abstraction in your DBField subclass.
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*/
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function requireField($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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$newTable = false;
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Profiler::mark('requireField');
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// backwards compatibility patch for pre 2.4 requireField() calls
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$spec_orig=$spec;
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if(!is_string($spec)) {
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// TODO: This is tempororary
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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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// 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 = eregi_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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// Get the value of this field.
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if(is_array($spec))
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$specValue=$spec['data_type'];
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else $specValue=$spec;
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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(!$newTable) {
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if(isset($this->fieldList[$table][$field])) {
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if(is_array($this->fieldList[$table][$field])) {
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$fieldValue = $this->fieldList[$table][$field]['data_type'];
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} else {
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$fieldValue = $this->fieldList[$table][$field];
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}
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}
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}
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// Get the version of the field as we would create it. This is used for comparison purposes to see if the
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// existing field is different to what we now want
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if(is_array($spec_orig)) {
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$spec_orig=DB::getConn()->$spec_orig['type']($spec_orig['parts']);
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}
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if($newTable || $fieldValue=='') {
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Profiler::mark('createField');
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$this->transCreateField($table, $field, $spec_orig);
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Profiler::unmark('createField');
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Database::alteration_message("Field $table.$field: created as $spec_orig","created");
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} else if($fieldValue != $specValue) {
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// If enums are being modified, then we need to fix existing data in the table.
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// Update any records where the enum is set to a legacy value to be set to the default.
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// One hard-coded exception is SiteTree - the default for this is Page.
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if(substr($specValue, 0, 4) == "enum") {
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$newStr = preg_replace("/(^enum\s*\(')|('$\).*)/i","",$spec_orig);
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$new = preg_split("/'\s*,\s*'/", $newStr);
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$oldStr = preg_replace("/(^enum\s*\(')|('$\).*)/i","", $fieldValue);
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$old = preg_split("/'\s*,\s*'/", $newStr);
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$holder = array();
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foreach($old as $check) {
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if(!in_array($check, $new)) {
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$holder[] = $check;
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}
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}
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if(count($holder)) {
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$default = explode('default ', $spec_orig);
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$default = $default[1];
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if($default == "'SiteTree'") $default = "'Page'";
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$query = "UPDATE \"$table\" SET $field=$default WHERE $field IN (";
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for($i=0;$i+1<count($holder);$i++) {
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$query .= "'{$holder[$i]}', ";
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}
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$query .= "'{$holder[$i]}')";
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DB::query($query);
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$amount = DB::affectedRows();
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Database::alteration_message("Changed $amount rows to default value of field $field (Value: $default)");
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}
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}
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Profiler::mark('alterField');
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$this->transAlterField($table, $field, $spec_orig);
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Profiler::unmark('alterField');
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Database::alteration_message("Field $table.$field: changed to $spec_orig <i style=\"color: #AAA\">(from {$fieldValue})</i>","changed");
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}
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Profiler::unmark('requireField');
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}
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|
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/**
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* If the given field exists, move it out of the way by renaming it to _obsolete_(fieldname).
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*
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* @param string $table
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* @param string $fieldName
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*/
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function dontRequireField($table, $fieldName) {
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$fieldList = $this->fieldList($table);
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if(array_key_exists($fieldName, $fieldList)) {
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$suffix = '';
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while(isset($fieldList[strtolower("_obsolete_{$fieldName}$suffix")])) {
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$suffix = $suffix ? ($suffix+1) : 2;
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}
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$this->renameField($table, $fieldName, "_obsolete_{$fieldName}$suffix");
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Database::alteration_message("Field $table.$fieldName: renamed to $table._obsolete_{$fieldName}$suffix","obsolete");
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}
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}
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/**
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* Execute a complex manipulation on the database.
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* A manipulation is an array of insert / or update sequences. The keys of the array are table names,
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* and the values are map containing 'command' and 'fields'. Command should be 'insert' or 'update',
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* and fields should be a map of field names to field values, including quotes. The field value can
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* also be a SQL function or similar.
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* @param array $manipulation
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*/
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function manipulate($manipulation) {
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if($manipulation) foreach($manipulation as $table => $writeInfo) {
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if(isset($writeInfo['fields']) && $writeInfo['fields']) {
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$fieldList = $columnList = $valueList = array();
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foreach($writeInfo['fields'] as $fieldName => $fieldVal) {
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$fieldList[] = "\"$fieldName\" = $fieldVal";
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$columnList[] = "\"$fieldName\"";
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// Empty strings inserted as null in INSERTs. Replacement of Database::replace_with_null().
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if($fieldVal === "''") $valueList[] = "null";
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else $valueList[] = $fieldVal;
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}
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if(!isset($writeInfo['where']) && isset($writeInfo['id'])) {
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$writeInfo['where'] = "\"ID\" = " . (int)$writeInfo['id'];
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}
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|
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switch($writeInfo['command']) {
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case "update":
|
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// Test to see if this update query shouldn't, in fact, be an insert
|
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if($this->query("SELECT \"ID\" FROM \"$table\" WHERE $writeInfo[where]")->value()) {
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$fieldList = implode(", ", $fieldList);
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$sql = "update \"$table\" SET $fieldList where $writeInfo[where]";
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$this->query($sql);
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|
break;
|
|
}
|
|
|
|
// ...if not, we'll skip on to the insert code
|
|
|
|
case "insert":
|
|
if(!isset($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:
|
|
$sql = null;
|
|
user_error("Database::manipulate() Can't recognise command '$writeInfo[command]'", E_USER_ERROR);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Replaces "\'\'" with "null", recursively walks through the given array.
|
|
* @param string $array Array where the replacement should happen
|
|
*/
|
|
static function replace_with_null(&$array) {
|
|
$array = ereg_replace('= *\'\'', "= null", $array);
|
|
|
|
if(is_array($array)) {
|
|
foreach($array as $key => $value) {
|
|
if(is_array($value)) {
|
|
array_walk($array, array(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 $errorLevel The level of the error to throw.
|
|
*/
|
|
function databaseError($msg, $errorLevel = E_USER_ERROR) {
|
|
user_error($msg, $errorLevel);
|
|
}
|
|
|
|
/**
|
|
* Enable supression of database messages.
|
|
*/
|
|
function quiet() {
|
|
Database::$supressOutput = true;
|
|
}
|
|
|
|
static function alteration_message($message,$type=""){
|
|
if(!Database::$supressOutput) {
|
|
$color = "";
|
|
switch ($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:
|
|
$color="";
|
|
}
|
|
echo (Director::is_cli()) ? " * ".strip_tags($message)."\n" : "<li style=\"color: $color\">$message</li>";
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Convert a SQLQuery object into a SQL statement
|
|
*/
|
|
public function sqlQueryToString(SQLQuery $sqlQuery) {
|
|
if (!$sqlQuery->from) return '';
|
|
$distinct = $sqlQuery->distinct ? "DISTINCT " : "";
|
|
if($sqlQuery->delete) {
|
|
$text = "DELETE ";
|
|
} else if($sqlQuery->select) {
|
|
$text = "SELECT $distinct" . implode(", ", $sqlQuery->select);
|
|
}
|
|
$text .= " FROM " . implode(" ", $sqlQuery->from);
|
|
|
|
if($sqlQuery->where) $text .= " WHERE (" . $sqlQuery->getFilter(). ")";
|
|
if($sqlQuery->groupby) $text .= " GROUP BY " . implode(", ", $sqlQuery->groupby);
|
|
if($sqlQuery->having) $text .= " HAVING ( " . implode(" ) AND ( ", $sqlQuery->having) . " )";
|
|
if($sqlQuery->orderby) $text .= " ORDER BY " . $sqlQuery->orderby;
|
|
|
|
if($sqlQuery->limit) {
|
|
$limit = $sqlQuery->limit;
|
|
// Pass limit as array or SQL string value
|
|
if(is_array($limit)) {
|
|
if(!array_key_exists('limit',$limit)) user_error('SQLQuery::limit(): Wrong format for $limit', E_USER_ERROR);
|
|
|
|
if(isset($limit['start']) && is_numeric($limit['start']) && isset($limit['limit']) && is_numeric($limit['limit'])) {
|
|
$combinedLimit = "$limit[limit] OFFSET $limit[start]";
|
|
} elseif(isset($limit['limit']) && is_numeric($limit['limit'])) {
|
|
$combinedLimit = (int)$limit['limit'];
|
|
} else {
|
|
$combinedLimit = false;
|
|
}
|
|
if(!empty($combinedLimit)) $text .= " LIMIT " . $combinedLimit;
|
|
|
|
} else {
|
|
$text .= " LIMIT " . $sqlQuery->limit;
|
|
}
|
|
}
|
|
|
|
return $text;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Abstract query-result class.
|
|
* Once again, this should be subclassed by an actual database implementation. It will only
|
|
* ever be constructed by a subclass of Database. The result of a database query - an iteratable object that's returned by DB::Query
|
|
*
|
|
* Primarily, the Query class takes care of the iterator plumbing, letting the subclasses focusing
|
|
* on providing the specific data-access methods that are required: {@link nextRecord()}, {@link numRecords()}
|
|
* and {@link seek()}
|
|
* @package sapphire
|
|
* @subpackage model
|
|
*/
|
|
abstract class Query extends Object implements Iterator {
|
|
/**
|
|
* The current record in the interator.
|
|
* @var array
|
|
*/
|
|
private $currentRecord = null;
|
|
|
|
/**
|
|
* The number of the current row in the interator.
|
|
* @var int
|
|
*/
|
|
private $rowNum = -1;
|
|
|
|
/**
|
|
* Return an array containing all values in the leftmost column.
|
|
* @return array
|
|
*/
|
|
public function column() {
|
|
$column = array();
|
|
foreach($this as $record) {
|
|
$column[] = reset($record);
|
|
}
|
|
return $column;
|
|
}
|
|
|
|
/**
|
|
* Return an array containing all values in the leftmost column, where the keys are the
|
|
* same as the values.
|
|
* @return array
|
|
*/
|
|
public function keyedColumn() {
|
|
$column = array();
|
|
foreach($this as $record) {
|
|
$val = reset($record);
|
|
$column[$val] = $val;
|
|
}
|
|
return $column;
|
|
}
|
|
|
|
/**
|
|
* Return a map from the first column to the second column.
|
|
* @return array
|
|
*/
|
|
public function map() {
|
|
$column = array();
|
|
foreach($this as $record) {
|
|
$key = reset($record);
|
|
$val = next($record);
|
|
$column[$key] = $val;
|
|
}
|
|
return $column;
|
|
}
|
|
|
|
/**
|
|
* Returns the next record in the iterator.
|
|
* @return array
|
|
*/
|
|
public function record() {
|
|
return $this->next();
|
|
}
|
|
|
|
/**
|
|
* Returns the first column of the first record.
|
|
* @return string
|
|
*/
|
|
public function value() {
|
|
foreach($this as $record) {
|
|
return reset($record);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return an HTML table containing the full result-set
|
|
*/
|
|
public function table() {
|
|
$first = true;
|
|
$result = "<table>\n";
|
|
|
|
foreach($this as $record) {
|
|
if($first) {
|
|
$result .= "<tr>";
|
|
foreach($record as $k => $v) {
|
|
$result .= "<th>" . Convert::raw2xml($k) . "</th> ";
|
|
}
|
|
$result .= "</tr> \n";
|
|
}
|
|
|
|
$result .= "<tr>";
|
|
foreach($record as $k => $v) {
|
|
$result .= "<td>" . Convert::raw2xml($v) . "</td> ";
|
|
}
|
|
$result .= "</tr> \n";
|
|
|
|
$first = false;
|
|
}
|
|
|
|
if($first) return "No records found";
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Iterator function implementation. Rewind the iterator to the first item and return it.
|
|
* Makes use of {@link seek()} and {@link numRecords()}, takes care of the plumbing.
|
|
* @return array
|
|
*/
|
|
public function rewind() {
|
|
if($this->numRecords() > 0) {
|
|
return $this->seek(0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Iterator function implementation. Return the current item of the iterator.
|
|
* @return array
|
|
*/
|
|
public function current() {
|
|
if(!$this->currentRecord) {
|
|
return $this->next();
|
|
} else {
|
|
return $this->currentRecord;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Iterator function implementation. Return the first item of this iterator.
|
|
* @return array
|
|
*/
|
|
public function first() {
|
|
$this->rewind();
|
|
return $this->current();
|
|
}
|
|
|
|
/**
|
|
* Iterator function implementation. Return the row number of the current item.
|
|
* @return int
|
|
*/
|
|
public function key() {
|
|
return $this->rowNum;
|
|
}
|
|
|
|
/**
|
|
* Iterator function implementation. Return the next record in the iterator.
|
|
* Makes use of {@link nextRecord()}, takes care of the plumbing.
|
|
* @return array
|
|
*/
|
|
public function next() {
|
|
$this->currentRecord = $this->nextRecord();
|
|
$this->rowNum++;
|
|
return $this->currentRecord;
|
|
}
|
|
|
|
/**
|
|
* Iterator function implementation. Check if the iterator is pointing to a valid item.
|
|
* @return boolean
|
|
*/
|
|
public function valid() {
|
|
return $this->current() !== false;
|
|
}
|
|
|
|
/**
|
|
* Return the next record in the query result.
|
|
* @return array
|
|
*/
|
|
abstract function nextRecord();
|
|
|
|
/**
|
|
* Return the total number of items in the query result.
|
|
* @return int
|
|
*/
|
|
abstract function numRecords();
|
|
|
|
/**
|
|
* Go to a specific row number in the query result and return the record.
|
|
* @param int $rowNum Tow number to go to.
|
|
* @return array
|
|
*/
|
|
abstract function seek($rowNum);
|
|
}
|
|
|
|
?>
|