MySQL replace database - php

Question

I have a .sql file and want to replace the already existing database by clicking a button. Everything works fine. Except the create query. Is there any query or command to import whole databases?
$filename = 'file.sql';
// MySQL host
$mysql_host = 'localhost';
// MySQL username
$mysql_username = 'user';
// MySQL password
$mysql_password = 'pw';
// Database name
$mysql_database = 'dbName';
// Connect to MySQL server
mysql_connect($mysql_host, $mysql_username, $mysql_password) or die('Error connecting to MySQL server: ' . mysql_error());
// Select database
mysql_select_db($mysql_database) or die('Error selecting MySQL database: ' . mysql_error());
$drop_db = "DROP DATABASE dbName";
mysql_query($drop_db) or die ("error");
$create_db = "";

Answer 1

I got it. The solution is to drop the tables not the whole database.
function resetClient() {
$erg = false;
try {
// get all tablenames
$sql = "SHOW TABLES FROM dbName";
$res = $this->conn->query($sql);
$this->conn->query("SET FOREIGN_KEY_CHECKS=0");
// drop all tables in db
if (is_object($res)) {
if (($res->num_rows > 0)) {
while ($row = $res->fetch_row()) {
$this->conn->query ("DROP TABLE " . $row[0]);
}
}
}
$this->conn->query("SET FOREIGN_KEY_CHECKS=1");
//pause
time_nanosleep(0, 250000000);
// create tables from script
$sql = file_get_contents('./scripts/file.sql');
$this->conn->multi_query($sql);
$erg = true;
error_log(date("Y-m-d H:i:s")." - DB resetted\n", 3,
"./scripts/success.log");
} catch (Exception $e) {
// log
error_log(date("Y-m-d H:i:s")." - DB error\n"
. "resetClientDB() \n"
. "Reset error \n"
. $e->getMessage() . "\n" , 3,
"./scripts/error.log");
}
return $erg;
}

Answer 2

You could try something like:
$cmds=array_filter( file( $filename ) );
foreach( $cmds as $cmd ){
echo $cmd;
}
If that looks ok substitute the echo for mysql_query( $cmd )... totally untested btw.
$sql=array();
$sourcefile='C:\data\db_20101222_0957.sql';
$cmds = file( $sourcefile, FILE_SKIP_EMPTY_LINES | FILE_IGNORE_NEW_LINES );
foreach( $cmds as $cmd ){
if ( substr( $cmd, 0, 2) == '--' || $cmd == '' || substr( $cmd,0, 2)=='/*' ) continue;
$sql[]=$cmd;
if ( substr( trim( $cmd ), -1, 1 ) == ';' ){
/* Query */
$query=implode( PHP_EOL, $sql );
/* Execute query */
echo '<pre>',$query,'</pre>';
$sql=array();
}
}