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<?php
require_once "DB/mysql.php";
class DB_mysql_SGL extends DB_mysql
{
var $debug = false;
/**
* Variable for storing the depth of transaction.
*/
var $transactionDepth = 0;
/**
* Returns the next free id in a sequence using the standard
* PEAR::Db / AdoDb method
*
* @param string $seq_name name of the sequence
* @param boolean $ondemand when true, the seqence is automatically
* created if it does not exist
*
* @return int the next id number in the sequence.
* A DB_Error object on failure.
*
* @see DB_common::nextID(), DB_common::getSequenceName(),
* DB_mysql::createSequence(), DB_mysql::dropSequence()
*/
function nextId_AdoDb($seq_name, $ondemand = true)
{
return parent::nextId($seq_name, $ondemand);
}
function getSequenceName($seq_name)
{
return $seq_name;
}
/**
* Overwritten method from parent class to allow logging facility
*
* @param the SQL query
*
* @access public
*
* @return mixed returns a valid MySQL result for successful SELECT
* queries, DB_OK for other successful queries. A DB error is
* returned on failure.
*/
function simpleQuery($query)
{
if ($this->debug) {
// to mysql server are sent not only queries passed as a parameters
// also the simpleQuery function when special condition occurs send
// some commands by itself, so we have to log it as well - that is
// why this condition.
if (!$this->autocommit && DB::isManip($query) && $this->transaction_opcount == 0) {
echo "SET AUTOCOMMIT=0<br>";
echo "START TRANSACTION<br>";
}
//echo "<pre>$query</pre>";
}
return parent::simpleQuery($query);
}
/**
* Sets the debug mode
*
* @param $debug boolean If debug should be on or off
*/
function setDebug($debug)
{
$this->debug = (boolean) $debug;
}
/**
* gets the debug value
*
* @return boolean if debug is on or off
*/
function getDebug()
{
return $this->debug;
}
/**
* Starts a new transaction or a sub-transaction if a transaction has
* already been started. Optionally, you can specify a transaction name
* identifier, to allow implementation of rollbacks to savepoints.
* Transaction isolation level is set to REPETABLE READ which is default
* for mysql transaction but this default value could be changed during
* mysql startup.
*
* @param String $name The name of a sub-transaction
* @return Integer DB_OK
* @access public
*/
function startTransaction($name = null)
{
if ($this->transactionDepth < 0) {
$this->transactionDepth = 0;
}
if ($this->transactionDepth > 0 && strlen($name) > 0) {
$result = $this->simpleQuery('SAVEPOINT ' . $name);
} else {
// Need this otherwise simpleQuery() will start a new transaction
$this->transaction_opcount++;
$result = $this->simpleQuery('SET AUTOCOMMIT=0');
$result = $this->simpleQuery('SET TRANSACTION ISOLATION LEVEL REPEATABLE READ');
$this->autoCommit(false);
// Need this otherwise simpleQuery() will start a new transaction
$this->transaction_opcount++;
}
if(! $result) {
return $this->mysqlRaiseError();
}
$this->transactionDepth++;
return DB_OK;
}
/**
* Commit a transaction or sub-transaction if one exists.
*
* @return Integer DB_OK
* @access public
*/
function commit()
{
// No transaction started! Ignore commit()
if ($this->transactionDepth < 1) {
$this->transactionDepth = 0;
return DB_OK;
}
$this->transactionDepth--;
// We only commit if we are at the top level and there were relevant queries,
// otherwise ignore...
if ($this->transactionDepth === 0 && $this->transaction_opcount > 0) {
$this->autocommit = true;
if ($this->_db) {
if (!@mysql_select_db($this->_db, $this->connection)) {
return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
}
}
$this->transaction_opcount = 0;
if (!$this->simpleQuery('COMMIT', $this->connection) ||
!$this->simpleQuery('SET AUTOCOMMIT=1', $this->connection)) {
return $this->mysqlRaiseError();
}
}
return DB_OK;
}
/**
* Rollback an existing transaction or sub-transaction.
*
* @return Integer DB_OK
* @access public
*/
function rollback($name = null)
{
// No transaction started! Ignore rollback()
if ($this->transactionDepth < 1) {
$this->transactionDepth = 0;
return DB_OK;
}
$this->transactionDepth--;
// Only rollback if there were any relevant transactions.
if ($this->transaction_opcount > 0) {
/*
if ($this->_db) {
if (!@mysql_select_db($this->_db, $this->connection)) {
return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
}
}
*/
// If this is a sub-transaction and a rollback to a named transaction was
// called, rollback to savepoint...
if ($this->transactionDepth > 0 && strlen($name) > 0) {
$result = $this->simpleQuery('ROLLBACK TO SAVEPOINT ' . $name, $this->connection);
} else {
// ...otherwise rollback the whole transaction
$result = $this->simpleQuery('ROLLBACK', $this->connection);
$result = $this->simpleQuery('SET AUTOCOMMIT=1', $this->connection);
$this->transaction_opcount = 0;
$this->transactionDepth = 0;
}
if (!$result) {
return $this->mysqlRaiseError();
}
}
return DB_OK;
}
}
?>