PHP导入数据库

<?php
$host = "localhost";
$user = "root";
$pwd = "123456";
$file_dir = dirname(__FILE__);
$file_name = "2012-05-23-bak.sql";
$data_base = "ci";

$conn = mysql_connect($host, $user, $pwd);

mysql_select_db($data_base, $conn);
/** PHP5 版本 **/
$get_sql_data = file_get_contents($file_name, $file_dir);

/**
* PHP4 版本
if(file_exists($file_dir."/".$file_name)) {
$get_sql_data = fopen($file_dir."/".$file_name,"r");
if(!$get_sql_data) {
echo "不能打开文件";
} else {
$get_sql_data = fread($get_sql_data, filesize ($file_dir."/".$file_name));
}
}
***/
$explode = explode(";", $get_sql_data);
$cnt = count($explode);
for ($i=0; $i<$cnt; $i++) {

$sql = $explode[$i];

$result = mysql_query($sql);
mysql_query("set names 'gbk'");

if ($result) {
echo "成功:".$i."个查询<br>";
} else {
echo "导入失败:".mysql_error();
}
}
?>