DBA：多方式建立數據庫

語法：
create database 'DBname';

一、服務器內建庫

[root@mysql-linuxview ~]# mysql -uroot -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.7.18-log Source distribution

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MySQL [(none)]> create database viewtest;
Query OK, 1 row affected (0.01 sec)

MySQL [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| linuxview          |
| mysql              |
| performance_schema |
| sys                |
| viewtest           |
+--------------------+
6 rows in set (0.00 sec)

MySQL [(none)]>

二、mysqladmin建庫

說明：如果是MySQL的普通用戶，需要root賦予特定創建或者刪除MySQL數據庫權限。
例：

[root@mysql-linuxview ~]# mysqladmin -uroot -p  create linuxtest
Enter password:
[root@mysql-linuxview ~]# mysql -uroot -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MySQL connection id is 17
Server version: 5.7.18-log Source distribution

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MySQL [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| linuxtest |
| linuxview |
| mysql |
| performance_schema |
| sys |
| viewtest |
+--------------------+
7 rows in set (0.00 sec)

MySQL [(none)]>

三、PHP腳本建庫

> > PHP使用mysqli_query函數來創建或者刪除MySQL數據庫
> 該函數有兩個參數，在執行成功是返回true，否則返回false。

> **語法：**
> mysqli_query(connection,query,resultmode);

![](http://i2.51cto.com/images/blog/201808/28/d7b788972dd31eca4334d5c8c4a69229.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)

**實例操作：**

[root@mysql-linuxview web]# cat index.php
<?
$dbhost = 'localhost:3306'; //MySQL的服務器地址和端口
$dbuser = 'root'; //登錄MySQL數據庫用戶名
$dbpass = '000000'; //登錄MySQL數據庫用戶密碼
$conn = mysqli_connect($dbhost,$dbuser,$dbpass);
if ( ! $conn)
{
die('Could not connect:'. mysqli_error());
}
echo 'connect success!!!<br />';
$vsql1 = 'create database lvtest';
$retval = mysqli_query($conn,$vsql1);
if ( ! $retval)
{
die('創建數據庫失敗:' . mysqli_query($conn));
}
echo "創建數據庫lvtest成功\n";
mysqli_close($conn);
?>
[root@mysql-linuxview web]#

查看結果
![](http://i2.51cto.com/images/blog/201808/28/d7ec5b8fecc7ba0d754df20e520ed402.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)

![](http://i2.51cto.com/images/blog/201808/28/1df76d1853a0eaa9cfb418215a9affe0.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)

輸出結果：
connect success!!!
創建數據庫lvtest成功

> 如果報錯：
> connect success!!!
> 創建數據庫失敗: