mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
338 lines
11 KiB
PHP
338 lines
11 KiB
PHP
<?php
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/**
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* Global database interface, complete with static methods.
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* Use this class for interacting with the database.
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*
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* @package sapphire
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* @subpackage model
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*/
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class DB {
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/**
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* This constant was added in SilverStripe 2.4 to indicate that SQL-queries
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* should now use ANSI-compatible syntax. The most notable affect of this
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* change is that table and field names should be escaped with double quotes
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* and not backticks
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*/
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const USE_ANSI_SQL = true;
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/**
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* The global database connection.
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* @var SS_Database
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*/
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private static $connections = array();
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/**
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* The last SQL query run.
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* @var string
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*/
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public static $lastQuery;
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/**
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* Internal flag to keep track of when db connection was attempted.
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*/
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private static $connection_attempted = false;
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/**
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* Set the global database connection.
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* Pass an object that's a subclass of SS_Database. This object will be used when {@link DB::query()}
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* is called.
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* @param $connection The connecton object to set as the connection.
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* @param $name The name to give to this connection. If you omit this argument, the connection
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* will be the default one used by the ORM. However, you can store other named connections to
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* be accessed through DB::getConn($name). This is useful when you have an application that
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* needs to connect to more than one database.
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*/
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static function setConn(SS_Database $connection, $name = 'default') {
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self::$connections[$name] = $connection;
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}
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/**
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* Get the global database connection.
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* @param $name An optional name given to a connection in the DB::setConn() call. If omitted,
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* the default connection is returned.
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* @return SS_Database
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*/
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static function getConn($name = 'default') {
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if(isset(self::$connections[$name])) {
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return self::$connections[$name];
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}
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}
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/**
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* Set an alternative database to use for this browser session.
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* This is useful when using testing systems other than SapphireTest; for example, Windmill.
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* Set it to null to revert to the main database.
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*/
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static function set_alternative_database_name($dbname) {
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$_SESSION["alternativeDatabaseName"] = $dbname;
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}
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/**
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* Get the name of the database in use
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*/
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static function get_alternative_database_name() {
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return $_SESSION["alternativeDatabaseName"];
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}
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/**
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* Connect to a database.
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* Given the database configuration, this method will create the correct subclass of SS_Database,
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* and set it as the global connection.
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* @param array $database A map of options. The 'type' is the name of the subclass of SS_Database to use. For the rest of the options, see the specific class.
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*/
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static function connect($databaseConfig) {
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// This is used by TestRunner::startsession() to test up a test session using an alt
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if(isset($_SESSION) && !empty($_SESSION['alternativeDatabaseName'])) {
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$databaseConfig['database'] = $_SESSION['alternativeDatabaseName'];
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}
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if(!isset($databaseConfig['type']) || empty($databaseConfig['type'])) {
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user_error("DB::connect: Not passed a valid database config", E_USER_ERROR);
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}
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self::$connection_attempted = true;
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$dbClass = $databaseConfig['type'];
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$conn = new $dbClass($databaseConfig);
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self::setConn($conn);
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}
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/**
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* Returns true if a database connection has been attempted.
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* In particular, it lets the caller know if we're still so early in the execution pipeline that
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* we haven't even tried to connect to the database yet.
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*/
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public static function connection_attempted() {
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return self::$connection_attempted;
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}
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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 $connect The connection string.
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**/
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public static function getConnect($parameters) {
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return self::getConn()->getConnect($parameters);
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}
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/**
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* Execute the given SQL query.
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* @param string $sql The SQL query to execute
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* @param int $errorLevel The level of error reporting to enable for the query
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* @return SS_Query
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*/
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static function query($sql, $errorLevel = E_USER_ERROR) {
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self::$lastQuery = $sql;
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return self::getConn()->query($sql, $errorLevel);
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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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*
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* Example:
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* <code>
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* array(
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* // Command: insert
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* "table name" => array(
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* "command" => "insert",
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* "fields" => array(
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* "ClassName" => "'MyClass'", // if you're setting a literal, you need to escape and provide quotes
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* "Created" => "now()", // alternatively, you can call DB functions
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* "ID" => 234,
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* ),
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* "id" => 234 // an alternative to providing ID in the fields list
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* ),
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*
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* // Command: update
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* "other table" => array(
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* "command" => "update",
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* "fields" => array(
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* "ClassName" => "'MyClass'",
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* "LastEdited" => "now()",
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* ),
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* "where" => "ID = 234",
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* "id" => 234 // an alternative to providing a where clause
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* ),
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* )
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* </code>
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*
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* You'll note that only one command on a given table can be called.
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* That's a limitation of the system that's due to it being written for {@link DataObject::write()},
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* which needs to do a single write on a number of different tables.
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*
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* @param array $manipulation
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*/
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static function manipulate($manipulation) {
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self::$lastQuery = $manipulation;
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return self::getConn()->manipulate($manipulation);
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}
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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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static function getGeneratedID($table) {
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return self::getConn()->getGeneratedID($table);
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}
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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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static function isActive() {
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if($conn = self::getConn()) return $conn->isActive();
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else return false;
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}
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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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* @param string $connect Connection string
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* @param string $username SS_Database username
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* @param string $password SS_Database Password
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* @param string $database SS_Database to which to create
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* @return boolean Returns true if successful
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*/
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static function createDatabase($connect, $username, $password, $database) {
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return self::getConn()->createDatabase($connect, $username, $password, $database);
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}
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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 $options An map of additional options. The available keys are as follows:
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* - 'MSSQLDatabase'/'MySQLDatabase'/'PostgreSQLDatabase' - database-specific options such as "engine" for MySQL.
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* - 'temporary' - If true, then a temporary table will be created
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* @return The table name generated. This may be different from the table name, for example with temporary tables.
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*/
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static function createTable($table, $fields = null, $indexes = null, $options = null) {
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return self::getConn()->createTable($table, $fields, $indexes, $options);
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}
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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 $spec The field specification, eg 'INTEGER NOT NULL'
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*/
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static function createField($table, $field, $spec) {
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return self::getConn()->createField($table, $field, $spec);
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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. The keys of the array are the names of the index.
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* @param boolean $hasAutoIncPK A flag indicating that the primary key on this table is an autoincrement type
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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('fields' => array('A','B','C'), 'type' => 'index/unique/fulltext'): This gives you full
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* control over the index.
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* @param string $options SQL statement to append to the CREATE TABLE call.
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*/
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static function requireTable($table, $fieldSchema = null, $indexSchema = null, $hasAutoIncPK=true, $options = null, $extensions=null) {
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return self::getConn()->requireTable($table, $fieldSchema, $indexSchema, $hasAutoIncPK, $options, $extensions);
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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 string $spec The field specification.
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*/
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static function requireField($table, $field, $spec) {
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return self::getConn()->requireField($table, $field, $spec);
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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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* @param string $table The table name.
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* @param string $index The index name.
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* @param string|boolean $spec The specification of the index. See requireTable() for more information.
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*/
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static function requireIndex($table, $index, $spec) {
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return self::getConn()->requireIndex($table, $index, $spec);
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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 $table The table name.
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*/
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static function dontRequireTable($table) {
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return self::getConn()->dontRequireTable($table);
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}
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/**
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* See {@link SS_Database->dontRequireField()}.
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*
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* @param string $table The table name.
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* @param string $fieldName
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*/
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static function dontRequireField($table, $fieldName) {
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return self::getConn()->dontRequireField($table, $fieldName);
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}
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/**
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* Checks a table's integrity and repairs it if necessary.
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* @var string $tableName The name of the table.
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* @return boolean Return true if the table has integrity after the method is complete.
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*/
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static function checkAndRepairTable($table) {
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return self::getConn()->checkAndRepairTable($table);
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}
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/**
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* Return the number of rows affected by the previous operation.
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* @return int
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*/
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static function affectedRows() {
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return self::getConn()->affectedRows();
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}
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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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static function tableList() {
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return self::getConn()->tableList();
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}
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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 $table The table name.
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* @return array
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*/
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static function fieldList($table) {
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return self::getConn()->fieldList($table);
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}
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/**
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* Enable supression of database messages.
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*/
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static function quiet() {
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return self::getConn()->quiet();
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}
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/**
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* Show a message about database alteration.
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*/
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static function alteration_message($message,$type="") {
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return self::getConn()->alterationMessage($message, $type);
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}
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}
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