Mariadb 简明教程

MariaDB - Create Database

在 MariaDB 中创建或删除数据库通常需要特权，这些特权通常只授予 root 用户或管理员。在这些帐户下，您有两种创建数据库的选项 − mysqladmin 二进制文件和 PHP 脚本。

Creation or deletion of databases in MariaDB requires privileges typically only given to root users or admins. Under these accounts, you have two options for creating a database − the mysqladmin binary and a PHP script.

mysqladmin binary

以下示例演示了使用 mysqladmin 二进制文件创建名为 Products 的数据库 −

The following example demonstrates the use of the mysqladmin binary in creating a database with the name Products −

[root@host]# mysqladmin -u root -p create PRODUCTS
Enter password:******

PHP Create Database Script

PHP 在创建 MariaDB 数据库时采用 mysql_query 函数。该函数使用两个参数，一个可选，成功时返回“true”值，失败时返回“false”值。

PHP employs the mysql_query function in creating a MariaDB database. The function uses two parameters, one optional, and returns either a value of “true” when successful, or “false” when not.

Syntax

审阅以下 create database script 语法 −

Review the following create database script syntax −

bool mysql_query( sql, connection );

参数说明如下 −

The description of the parameters is given below −

S.No

Parameter & Description

1

sql This required parameter consists of the SQL query needed to perform the operation.

2

connection When not specified, this optional parameter uses the most recent connection used.

尝试以下示例代码以创建数据库 −

Try the following example code for creating a database −

<html>
   <head>
      <title>Create a MariaDB Database</title>
   </head>

   <body>
      <?php
         $dbhost = 'localhost:3036';
         $dbuser = 'root';
         $dbpass = 'rootpassword';
         $conn = mysql_connect($dbhost, $dbuser, $dbpass);

         if(! $conn ) {
            die('Could not connect: ' . mysql_error());
         }

         echo 'Connected successfully<br />';
         $sql = 'CREATE DATABASE PRODUCTS';
         $retval = mysql_query( $sql, $conn );

         if(! $retval ) {
            die('Could not create database: ' . mysql_error());
         }

         echo "Database PRODUCTS created successfully\n";
         mysql_close($conn);
      ?>
   </body>
</html>

成功删除后，您将看到以下输出 −

On successful deletion, you will see the following output −

mysql> Database PRODUCTS created successfully
mysql> SHOW DATABASES;
+-----------------------+
| Database              |
+-----------------------+
| PRODUCTS              |
+-----------------------+