mysql_select_db()

传送MySQL DB选择查询

Description

bool/string mysql_select_db(string $db_name)

Parameters

Return Value

成功时true，失败时false或是应答信息

Example

<?php
include_once "/lib/sn_dns.php";                  // include DNS library
include_once "/lib/sn_mysql.php";

$db_name = "testdb";                             // database's name to select
$query_create_db = "CREATE DATABASE $db_name;";  // SQL sentance to make a database
$query_drop_db = "DROP DATABASE $db_name;";      // SQL sentance to delete a database

$server_addr = "192.168.0.100";                  // IP address of MySQL server
$user_name = "user_id";                          // MySQL ID
$password = "password";                          // MySQL password

// connect to a MySQL server
if(mysql_connect($server_addr, $user_name, $password) === false)
    exit(mysql_error());                         // print the error message and quit

if(mysql_query($query_create_db) === false)      // send a query to make a database
    exit(mysql_error());                         // print the error message and quit

if(mysql_select_db($db_name) === true)           // select the database
    echo "Database $db_name is selected!\r\n";
else
    exit(mysql_error());                         // print the error message and quit

if(mysql_query($query_drop_db) === false)        // send a query to delete the database
    exit(mysql_error());                         // print the error message and quit

mysql_close();                                   // disconnecting from the MySQL server
?>

See also