360 lines
9.4 KiB
PHP
360 lines
9.4 KiB
PHP
<?php
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/**
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* PDO driver database connector
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* @package framework
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* @subpackage model
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*/
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class PDOConnector extends DBConnector {
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/**
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* Should ATTR_EMULATE_PREPARES flag be used to emulate prepared statements?
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*
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* @config
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* @var boolean
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*/
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private static $emulate_prepare = false;
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/**
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* The PDO connection instance
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*
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* @var PDO
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*/
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protected $pdoConnection = null;
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/**
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* Name of the currently selected database
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*
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* @var string
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*/
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protected $databaseName = null;
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/**
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* The most recent statement returned from PDODatabase->query
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*
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* @var PDOStatement
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*/
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protected $lastStatement = null;
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/**
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* List of prepared statements, cached by SQL string
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*
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* @var array
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*/
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protected $cachedStatements = array();
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/**
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* Flush all prepared statements
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*/
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public function flushStatements() {
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$this->cachedStatements = array();
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}
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/**
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* Retrieve a prepared statement for a given SQL string, or return an already prepared version if
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* one exists for the given query
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*
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* @param string $sql
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* @return PDOStatement
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*/
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public function getOrPrepareStatement($sql) {
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if(empty($this->cachedStatements[$sql])) {
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$this->cachedStatements[$sql] = $this->pdoConnection->prepare(
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$sql,
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array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY)
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);
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}
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return $this->cachedStatements[$sql];
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}
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/**
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* Is PDO running in emulated mode
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*
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* @return boolean
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*/
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public static function is_emulate_prepare() {
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return Config::inst()->get('PDOConnector', 'emulate_prepare');
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}
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public function connect($parameters, $selectDB = false) {
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$this->flushStatements();
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// Build DSN string
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// Note that we don't select the database here until explicitly
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// requested via selectDatabase
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$driver = $parameters['driver'] . ":";
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$dsn = array();
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// Typically this is false, but some drivers will request this
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if($selectDB) {
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// Specify complete file path immediately following driver (SQLLite3)
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if(!empty($parameters['filepath'])) {
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$dsn[] = $parameters['filepath'];
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} elseif(!empty($parameters['database'])) {
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// Some databases require a selected database at connection (SQLite3, Azure)
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if($parameters['driver'] === 'sqlsrv') {
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$dsn[] = "Database={$parameters['database']}";
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} else {
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$dsn[] = "dbname={$parameters['database']}";
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}
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}
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}
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// Syntax for sql server is slightly different
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if($parameters['driver'] === 'sqlsrv') {
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$server = $parameters['server'];
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if (!empty($parameters['port'])) {
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$server .= ",{$parameters['port']}";
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}
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$dsn[] = "Server=$server";
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} else {
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if (!empty($parameters['server'])) {
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// Use Server instead of host for sqlsrv
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$dsn[] = "host={$parameters['server']}";
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}
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if (!empty($parameters['port'])) {
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$dsn[] = "port={$parameters['port']}";
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}
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}
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// Set charset if given and not null. Can explicitly set to empty string to omit
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if($parameters['driver'] !== 'sqlsrv') {
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$charset = isset($parameters['charset'])
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? $parameters['charset']
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: 'utf8';
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if (!empty($charset)) $dsn[] = "charset=$charset";
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}
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// Connection commands to be run on every re-connection
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$options = array(
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PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
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PDO::ATTR_EMULATE_PREPARES => self::is_emulate_prepare()
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);
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// May throw a PDOException if fails
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if(empty($parameters['username']) || empty($parameters['password'])) {
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$this->pdoConnection = new PDO($driver.implode(';', $dsn));
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} else {
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$this->pdoConnection = new PDO($driver.implode(';', $dsn), $parameters['username'],
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$parameters['password'], $options);
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}
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// Show selected DB if requested
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if($this->pdoConnection && $selectDB && !empty($parameters['database'])) {
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$this->databaseName = $parameters['database'];
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}
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}
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public function getVersion() {
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return $this->pdoConnection->getAttribute(PDO::ATTR_SERVER_VERSION);
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}
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public function escapeString($value) {
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$value = $this->quoteString($value);
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// Since the PDO library quotes the value, we should remove this to maintain
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// consistency with MySQLDatabase::escapeString
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if (preg_match('/^\'(?<value>.*)\'$/', $value, $matches)) {
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$value = $matches['value'];
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}
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return $value;
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}
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public function quoteString($value) {
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return $this->pdoConnection->quote($value);
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}
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/**
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* Executes a query that doesn't return a resultset
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*
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* @param string $sql
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* @param string $sql The SQL query to execute
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* @param integer $errorLevel For errors to this query, raise PHP errors
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* using this error level.
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*/
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public function exec($sql, $errorLevel = E_USER_ERROR) {
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// Check if we should only preview this query
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if ($this->previewWrite($sql)) return;
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// Reset last statement to prevent interference in case of error
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$this->lastStatement = null;
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// Benchmark query
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$pdo = $this->pdoConnection;
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$result = $this->benchmarkQuery($sql, function($sql) use($pdo) {
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return $pdo->exec($sql);
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});
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// Check for errors
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if ($result === false) {
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$this->databaseError($this->getLastError(), $errorLevel, $sql);
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return null;
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}
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return $result;
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}
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public function query($sql, $errorLevel = E_USER_ERROR) {
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// Check if we should only preview this query
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if ($this->previewWrite($sql)) return;
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// Benchmark query
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$pdo = $this->pdoConnection;
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$this->lastStatement = $this->benchmarkQuery($sql, function($sql) use($pdo) {
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return $pdo->query($sql);
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});
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// Check for errors
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if (!$this->lastStatement || $this->hasError($this->lastStatement)) {
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$this->databaseError($this->getLastError(), $errorLevel, $sql);
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return null;
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}
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return new PDOQuery($this->lastStatement);
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}
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/**
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* Determines the PDO::PARAM_* type for a given PHP type string
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* @param string $phpType Type of object in PHP
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* @return integer PDO Parameter constant value
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*/
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public function getPDOParamType($phpType) {
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switch($phpType) {
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case 'boolean':
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return PDO::PARAM_BOOL;
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case 'NULL':
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return PDO::PARAM_NULL;
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case 'integer':
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return PDO::PARAM_INT;
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case 'object': // Allowed if the object or resource has a __toString method
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case 'resource':
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case 'float': // Not actually returnable from get_type
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case 'double':
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case 'string':
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return PDO::PARAM_STR;
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case 'blob':
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return PDO::PARAM_LOB;
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case 'array':
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case 'unknown type':
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default:
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user_error("Cannot bind parameter as it is an unsupported type ($phpType)", E_USER_ERROR);
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}
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}
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/**
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* Bind all parameters to a PDOStatement
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*
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* @param PDOStatement $statement
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* @param array $parameters
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*/
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public function bindParameters(PDOStatement $statement, $parameters) {
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// Bind all parameters
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for($index = 0; $index < count($parameters); $index++) {
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$value = $parameters[$index];
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$phpType = gettype($value);
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// Allow overriding of parameter type using an associative array
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if($phpType === 'array') {
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$phpType = $value['type'];
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$value = $value['value'];
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}
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// Check type of parameter
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$type = $this->getPDOParamType($phpType);
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if($type === PDO::PARAM_STR) $value = strval($value);
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// Bind this value
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$statement->bindValue($index+1, $value, $type);
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}
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}
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public function preparedQuery($sql, $parameters, $errorLevel = E_USER_ERROR) {
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// Check if we should only preview this query
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if ($this->previewWrite($sql)) return;
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// Benchmark query
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$self = $this;
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$this->lastStatement = $this->benchmarkQuery($sql, function($sql) use($parameters, $self) {
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// Prepare statement
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$statement = $self->getOrPrepareStatement($sql);
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if(!$statement) return null;
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// Inject parameters
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$self->bindParameters($statement, $parameters);
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// Safely execute the statement
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$statement->execute($parameters);
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return $statement;
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});
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// Check for errors
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if (!$this->lastStatement || $this->hasError($this->lastStatement)) {
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$values = $this->parameterValues($parameters);
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$this->databaseError($this->getLastError(), $errorLevel, $sql, $values);
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return null;
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}
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return new PDOQuery($this->lastStatement);
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}
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/**
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* Determine if a resource has an attached error
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*
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* @param PDOStatement|PDO $resource the resource to check
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* @return boolean Flag indicating true if the resource has an error
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*/
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protected function hasError($resource) {
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// No error if no resource
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if(empty($resource)) return false;
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// If the error code is empty the statement / connection has not been run yet
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$code = $resource->errorCode();
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if(empty($code)) return false;
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// Skip 'ok' and undefined 'warning' types.
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// @see http://docstore.mik.ua/orelly/java-ent/jenut/ch08_06.htm
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return $code !== '00000' && $code !== '01000';
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}
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public function getLastError() {
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if ($this->hasError($this->lastStatement)) {
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$error = $this->lastStatement->errorInfo();
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} elseif($this->hasError($this->pdoConnection)) {
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$error = $this->pdoConnection->errorInfo();
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}
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if (isset($error)) {
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return sprintf("%s-%s: %s", $error[0], $error[1], $error[2]);
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}
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}
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public function getGeneratedID($table) {
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return $this->pdoConnection->lastInsertId();
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}
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public function affectedRows() {
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if (empty($this->lastStatement)) return 0;
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return $this->lastStatement->rowCount();
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}
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public function selectDatabase($name) {
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$this->exec("USE \"{$name}\"");
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$this->databaseName = $name;
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return true;
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}
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public function getSelectedDatabase() {
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return $this->databaseName;
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}
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public function unloadDatabase() {
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$this->databaseName = null;
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}
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public function isActive() {
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return $this->databaseName && $this->pdoConnection;
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}
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}
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