<?php
/**
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.
*
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to kontakt@beberlei.de so we can send you a copy immediately.
*
* @author Benjamin Eberlei (kontakt@beberlei.de)
* @copyright Copyright (c) 2009 Benjamin Eberlei
* @link http://github.com/beberlei/Zend_Db-Adapter-for-ext-mysql
* @license New BSD License
* @package Engine
* @subpackage Db
*/
/**
* @see Zend_Db_Adapter_Abstract
*/
//require_once "Zend/Db/Adapter/Abstract.php";
/**
* @see Engine_Db_Statement_Mysql
*/
//require_once "Engine/Db/Statement/Mysql.php";
class Engine_Db_Adapter_Mysql extends Zend_Db_Adapter_Abstract
{
/**
* Keys are UPPERCASE SQL datatypes or the constants
* Zend_Db::INT_TYPE, Zend_Db::BIGINT_TYPE, or Zend_Db::FLOAT_TYPE.
*
* Values are:
* 0 = 32-bit integer
* 1 = 64-bit integer
* 2 = float or decimal
*
* @var array Associative array of datatypes to values 0, 1, or 2.
*/
protected $_numericDataTypes = array(
Zend_Db::INT_TYPE => Zend_Db::INT_TYPE,
Zend_Db::BIGINT_TYPE => Zend_Db::BIGINT_TYPE,
Zend_Db::FLOAT_TYPE => Zend_Db::FLOAT_TYPE,
'INT' => Zend_Db::INT_TYPE,
'INTEGER' => Zend_Db::INT_TYPE,
'MEDIUMINT' => Zend_Db::INT_TYPE,
'SMALLINT' => Zend_Db::INT_TYPE,
'TINYINT' => Zend_Db::INT_TYPE,
'BIGINT' => Zend_Db::BIGINT_TYPE,
'SERIAL' => Zend_Db::BIGINT_TYPE,
'DEC' => Zend_Db::FLOAT_TYPE,
'DECIMAL' => Zend_Db::FLOAT_TYPE,
'DOUBLE' => Zend_Db::FLOAT_TYPE,
'DOUBLE PRECISION' => Zend_Db::FLOAT_TYPE,
'FIXED' => Zend_Db::FLOAT_TYPE,
'FLOAT' => Zend_Db::FLOAT_TYPE
);
public function setConnectionResource($connection)
{
$this->_connection = $connection;
}
/**
* Returns a list of the tables in the database.
*
* @return array
*/
public function listTables()
{
$tables = array();
$query = "SHOW TABLES FROM ".$this->quoteIdentifier($this->_config['dbname']);
if(false != ($rs = mysql_query($query, $this->getConnection()))) {
while($row = mysql_fetch_row($rs)) {
$tables[] = $row[0];
}
}
return $tables;
}
/**
* Returns the column descriptions for a table.
*
* The return value is an associative array keyed by the column name,
* as returned by the RDBMS.
*
* The value of each array element is an associative array
* with the following keys:
*
* SCHEMA_NAME => string; name of database or schema
* TABLE_NAME => string;
* COLUMN_NAME => string; column name
* COLUMN_POSITION => number; ordinal position of column in table
* DATA_TYPE => string; SQL datatype name of column
* DEFAULT => string; default expression of column, null if none
* NULLABLE => boolean; true if column can have nulls
* LENGTH => number; length of CHAR/VARCHAR
* SCALE => number; scale of NUMERIC/DECIMAL
* PRECISION => number; precision of NUMERIC/DECIMAL
* UNSIGNED => boolean; unsigned property of an integer type
* PRIMARY => boolean; true if column is part of the primary key
* PRIMARY_POSITION => integer; position of column in primary key
*
* @param string $tableName
* @param string $schemaName OPTIONAL
* @return array
*/
public function describeTable($tableName, $schemaName = null)
{
$this->_connect();
/**
* @todo use INFORMATION_SCHEMA someday when
* MySQL's implementation isn't too slow.
*/
if ($schemaName) {
$sql = 'DESCRIBE ' . $this->quoteIdentifier("$schemaName.$tableName", true);
} else {
$sql = 'DESCRIBE ' . $this->quoteIdentifier($tableName, true);
}
/**
* Use mysqli extension API, because DESCRIBE doesn't work
* well as a prepared statement on MySQL 4.1.
*/
if (false != ($queryResult = mysql_query($sql, $this->getConnection()))) {
while ($row = mysql_fetch_assoc($queryResult)) {
$result[] = $row;
}
mysql_free_result($queryResult);
} else {
/**
* @see Zend_Db_Adapter_Mysqli_Exception
*/
require_once 'Zend/Db/Adapter/Mysqli/Exception.php';
throw new Zend_Db_Adapter_Mysqli_Exception($this->getConnection()->error);
}
$desc = array();
$row_defaults = array(
'Length' => null,
'Scale' => null,
'Precision' => null,
'Unsigned' => null,
'Primary' => false,
'PrimaryPosition' => null,
'Identity' => false
);
$i = 1;
$p = 1;
foreach ($result as $key => $row) {
$row = array_merge($row_defaults, $row);
if (preg_match('/unsigned/', $row['Type'])) {
$row['Unsigned'] = true;
}
if (preg_match('/^((?:var)?char)\((\d+)\)/', $row['Type'], $matches)) {
$row['Type'] = $matches[1];
$row['Length'] = $matches[2];
} else if (preg_match('/^decimal\((\d+),(\d+)\)/', $row['Type'], $matches)) {
$row['Type'] = 'decimal';
$row['Precision'] = $matches[1];
$row['Scale'] = $matches[2];
} else if (preg_match('/^float\((\d+),(\d+)\)/', $row['Type'], $matches)) {
$row['Type'] = 'float';
$row['Precision'] = $matches[1];
$row['Scale'] = $matches[2];
} else if (preg_match('/^((?:big|medium|small|tiny)?int)\((\d+)\)/', $row['Type'], $matches)) {
$row['Type'] = $matches[1];
/**
* The optional argument of a MySQL int type is not precision
* or length; it is only a hint for display width.
*/
}
if (strtoupper($row['Key']) == 'PRI') {
$row['Primary'] = true;
$row['PrimaryPosition'] = $p;
if ($row['Extra'] == 'auto_increment') {
$row['Identity'] = true;
} else {
$row['Identity'] = false;
}
++$p;
}
$desc[$this->foldCase($row['Field'])] = array(
'SCHEMA_NAME' => null, // @todo
'TABLE_NAME' => $this->foldCase($tableName),
'COLUMN_NAME' => $this->foldCase($row['Field']),
'COLUMN_POSITION' => $i,
'DATA_TYPE' => $row['Type'],
'DEFAULT' => $row['Default'],
'NULLABLE' => (bool) ($row['Null'] == 'YES'),
'LENGTH' => $row['Length'],
'SCALE' => $row['Scale'],
'PRECISION' => $row['Precision'],
'UNSIGNED' => $row['Unsigned'],
'PRIMARY' => $row['Primary'],
'PRIMARY_POSITION' => $row['PrimaryPosition'],
'IDENTITY' => $row['Identity']
);
++$i;
}
return $desc;
}
/**
* Creates a connection to the database.
*
* @return void
*/
protected function _connect()
{
if(is_resource($this->_connection)) {
return;
}
$this->_connection = @mysql_connect(
$this->_config['host'],
$this->_config['username'],
$this->_config['password'],
true
);
if($this->_connection == false) {
$this->_connection = null;
$this->_throwException();
}
if(@mysql_select_db($this->_config['dbname'], $this->_connection) == false) {
$this->_throwException();
}
if (!empty($this->_config['charset'])) {
if( function_exists('mysql_set_charset') ) {
mysql_set_charset($this->_config['charset'], $this->_connection);
} else {
mysql_query('SET NAMES ' . $this->quote($this->_config['charset']), $this->_connection);
}
}
}
private function _throwException($message=null)
{
//require_once "Engine/Db/Adapter/Mysql/Exception.php";
if( $message === null ) {
if( is_resource($this->_connection) ) {
$message = mysql_error($this->_connection)." (".mysql_errno($this->_connection).")";
} else {
$message = mysql_error()." (".mysql_errno().")";
}
}
throw new Engine_Db_Adapter_Mysql_Exception($message);
}
/**
* Test if a connection is active
*
* @return boolean
*/
public function isConnected()
{
return(is_resource($this->_connection));
}
/**
* Force the connection to close.
*
* @return void
*/
public function closeConnection()
{
if($this->isConnected()) {
mysql_close($this->_connection);
$this->_connection = null;
}
}
/**
* Prepare a statement and return a PDOStatement-like object.
*
* @param string|Zend_Db_Select $sql SQL query
* @return Zend_Db_Statement|PDOStatement
*/
public function prepare($sql)
{
return new Engine_Db_Statement_Mysql($this, $sql);
}
/**
* Gets the last ID generated automatically by an IDENTITY/AUTOINCREMENT column.
*
* As a convention, on RDBMS brands that support sequences
* (e.g. Oracle, PostgreSQL, DB2), this method forms the name of a sequence
* from the arguments and returns the last id generated by that sequence.
* On RDBMS brands that support IDENTITY/AUTOINCREMENT columns, this method
* returns the last value generated for such a column, and the table name
* argument is disregarded.
*
* @param string $tableName OPTIONAL Name of table.
* @param string $primaryKey OPTIONAL Name of primary key column.
* @return string
*/
public function lastInsertId($tableName = null, $primaryKey = null)
{
return (string) mysql_insert_id($this->getConnection());
}
/**
* Begin a transaction.
*/
protected function _beginTransaction()
{
$this->_connect();
mysql_query("START TRANSACTION", $this->getConnection());
}
/**
* Commit a transaction.
*/
protected function _commit()
{
mysql_query("COMMIT", $this->getConnection());
}
/**
* Roll-back a transaction.
*/
protected function _rollBack()
{
mysql_query("ROLLBACK");
}
/**
* Set the fetch mode.
*
* @param integer $mode
* @return void
* @throws Zend_Db_Adapter_Exception
*/
public function setFetchMode($mode)
{
switch($mode) {
case Zend_Db::FETCH_ASSOC:
case Zend_Db::FETCH_NUM:
case Zend_Db::FETCH_BOTH:
case Zend_Db::FETCH_OBJ:
case Zend_Db::FETCH_BOUND:
$this->_fetchMode = $mode;
break;
case Zend_Db::FETCH_NAMED:
case Zend_Db::FETCH_LAZY:
default:
$this->_throwException("Invalid fetch mode '".$mode."' specified");
}
}
/**
* Adds an adapter-specific LIMIT clause to the SELECT statement.
*
* @param mixed $sql
* @param integer $count
* @param integer $offset
* @return string
*/
public function limit($sql, $count, $offset = 0)
{
$count = intval($count);
if ($count <= 0) {
$this->_throwException("LIMIT argument count=$count is not valid");
}
$offset = intval($offset);
if ($offset < 0) {
$this->_throwException("LIMIT argument offset=$offset is not valid");
}
$sql .= " LIMIT $count";
if ($offset > 0) {
$sql .= " OFFSET $offset";
}
return $sql;
}
/**
* Check if the adapter supports real SQL parameters.
*
* @param string $type 'positional' or 'named'
* @return bool
*/
public function supportsParameters($type)
{
if($type == 'positional') {
return true;
}
return false;
}
/**
* Retrieve server version in PHP style
*
* @return string
*/
public function getServerVersion()
{
return mysql_get_server_info($this->getConnection());
}
/**
* Returns the symbol the adapter uses for delimited identifiers.
*
* @return string
*/
public function getQuoteIdentifierSymbol()
{
return '`';
}
/**
* Quote a raw string.
*
* @param mixed $value Raw string
*
* @return string Quoted string
*/
protected function _quote($value)
{
if (is_int($value) || is_float($value)) {
return $value;
}
return "'" . mysql_real_escape_string($value, $this->getConnection()) . "'";
}
}