最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
After logging into the MySQL service, we can use the create Command to create the database, the syntax is as follows:
CREATE DATABASE 数据库名; The following command simply demonstrates the process of creating a database, named RUNOOB:
[root@host]# mysql -u root -p Enter password:****** # 登录后进入终端 mysql> create DATABASE RUNOOB; Create a database using mysqladmin ¶
With normal users, you may need specific permissions to create or delete MySQL databases.
So we use the root user to log in, and the root user has the highest privileges, so we can use the mysql mysqladmin command to create the database.
The following command simply demonstrates the process of creating a database, named RUNOOB:
[root@host]# mysqladmin -u root -p create RUNOOB Enter password:****** The MySQL database RUNOOB is created after the above command is executed successfully. PHP usage This function takes two arguments and returns on successful execution. Create a database using a PHP script ¶
mysqli_query Function to create or delete an MySQL database. TRUE Otherwise, return FALSE .
Grammar ¶
mysqli_query(connection,query,resultmode); Parameters. | Description |
|---|---|
connection | Necessary. Specifies the MySQL connection to be used. |
query | Required, specify the query string. |
resultmode | Optional. A constant. It can be any of the following values:
|
Example ¶
The following example demonstrates using PHP to create a database:
Create a database
';$sql='CREATE DATABASE RUNOOB';$retval=mysqli_query($conn,$sql);if(!$retval){die('创建数据库失败:'.mysqli_error($conn));}echo"数据库 RUNOOB 创建成功\\n";mysqli_close($conn);?> When the execution is successful, the following result is returned:
If the database already exists, the following result is returned after execution:
