197 lines
4.0 KiB
PHP
197 lines
4.0 KiB
PHP
<?php
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namespace PicoDb\Driver;
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use PDO;
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use PDOException;
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/**
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* Postgres Driver
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*
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* @package PicoDb\Driver
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* @author Frederic Guillot
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*/
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class Postgres extends Base
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{
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/**
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* List of required settings options
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*
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* @access protected
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* @var array
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*/
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protected $requiredAttributes = array(
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'hostname',
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'username',
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'password',
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'database',
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);
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/**
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* Table to store the schema version
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*
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* @access private
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* @var array
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*/
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private $schemaTable = 'schema_version';
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/**
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* Create a new PDO connection
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*
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* @access public
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* @param array $settings
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*/
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public function createConnection(array $settings)
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{
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$dsn = 'pgsql:host='.$settings['hostname'].';dbname='.$settings['database'];
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if (! empty($settings['port'])) {
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$dsn .= ';port='.$settings['port'];
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}
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$this->pdo = new PDO($dsn, $settings['username'], $settings['password']);
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if (isset($settings['schema_table'])) {
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$this->schemaTable = $settings['schema_table'];
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}
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}
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/**
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* Enable foreign keys
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*
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* @access public
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*/
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public function enableForeignKeys()
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{
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}
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/**
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* Disable foreign keys
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*
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* @access public
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*/
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public function disableForeignKeys()
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{
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}
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/**
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* Return true if the error code is a duplicate key
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*
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* @access public
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* @param integer $code
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* @return boolean
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*/
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public function isDuplicateKeyError($code)
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{
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return $code == 23505 || $code == 23503;
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}
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/**
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* Escape identifier
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*
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* @access public
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* @param string $identifier
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* @return string
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*/
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public function escape($identifier)
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{
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return '"'.$identifier.'"';
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}
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/**
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* Get non standard operator
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*
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* @access public
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* @param string $operator
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* @return string
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*/
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public function getOperator($operator)
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{
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if ($operator === 'LIKE') {
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return 'LIKE';
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}
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else if ($operator === 'ILIKE') {
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return 'ILIKE';
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}
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return '';
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}
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/**
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* Get last inserted id
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*
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* @access public
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* @return integer
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*/
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public function getLastId()
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{
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try {
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$rq = $this->pdo->prepare('SELECT LASTVAL()');
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$rq->execute();
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return $rq->fetchColumn();
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}
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catch (PDOException $e) {
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return 0;
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}
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}
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/**
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* Get current schema version
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*
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* @access public
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* @return integer
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*/
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public function getSchemaVersion()
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{
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$this->pdo->exec("CREATE TABLE IF NOT EXISTS ".$this->schemaTable." (version INTEGER DEFAULT 0)");
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$rq = $this->pdo->prepare('SELECT "version" FROM "'.$this->schemaTable.'"');
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$rq->execute();
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$result = $rq->fetchColumn();
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if ($result !== false) {
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return (int) $result;
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}
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else {
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$this->pdo->exec('INSERT INTO '.$this->schemaTable.' VALUES(0)');
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}
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return 0;
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}
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/**
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* Set current schema version
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*
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* @access public
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* @param integer $version
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*/
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public function setSchemaVersion($version)
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{
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$rq = $this->pdo->prepare('UPDATE '.$this->schemaTable.' SET version=?');
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$rq->execute(array($version));
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}
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/**
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* Run EXPLAIN command
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*
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* @param string $sql
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* @param array $values
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* @return array
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*/
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public function explain($sql, array $values)
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{
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return $this->getConnection()->query('EXPLAIN (FORMAT YAML) '.$this->getSqlFromPreparedStatement($sql, $values))->fetchAll(PDO::FETCH_ASSOC);
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}
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/**
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* Get database version
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*
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* @access public
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* @return array
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*/
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public function getDatabaseVersion()
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{
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return $this->getConnection()->query('SHOW server_version')->fetchColumn();
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}
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}
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