php-class(交易功能)

http://www.php.net/manual/tw/function.mysql-query.php

mysql_query doesnt support multiple queries, a way round this is to use innodb and transactions

this db class/function will accept an array of arrays of querys, it will auto check every line for affected rows in db, if one is 0 it will rollback and return false, else it will commit and return true, the call to the function is simple and is easy to read etc
----------

class MySQLDB
{
private $connection; // The MySQL database connection

/* Class constructor */
function MySQLDB(){
/* Make connection to database */
$this->connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS) or die(mysql_error());
mysql_select_db(DB_NAME, $this->connection) or die(mysql_error());
}

/* Transactions functions */

function begin(){
$null = mysql_query("START TRANSACTION", $this->connection);
return mysql_query("BEGIN", $this->connection);
}

function commit(){
return mysql_query("COMMIT", $this->connection);
}

function rollback(){
return mysql_query("ROLLBACK", $this->connection);
}

function transaction($q_array){
$retval = 1;

$this->begin();

foreach($q_array as $qa){
$result = mysql_query($qa['query'], $this->connection);
if(mysql_affected_rows() == 0){ $retval = 0; }
}

if($retval == 0){
$this->rollback();
return false;
}else{
$this->commit();
return true;
}
}

};

/* Create database connection object */
$database = new MySQLDB;

// then from anywhere else simply put the transaction queries in an array or arrays like this:

function function(){
global $database;

$q = array (
array("query" => "UPDATE table WHERE something = 'something'"),
array("query" => "UPDATE table WHERE something_else = 'something_else'"),
array("query" => "DELETE FROM table WHERE something_else2 = 'something_else2'"),
);

$database->transaction($q);

}