This article explains some basic operations of the MySQL database. I hope it will be useful to everyone.
Recommended courses: MySQL Tutorial.
1. Starting and shutting down the MySQL server
1. Start the MySQL server
Start-> Run Enter "cmd" and then enter the "net start MySQL" command at the command prompt.
2. Connect to the MySQL server
Enter the command: MySQL -uroot -h127.0.0.1 -p111 (-h127.0.0.1 depends on personal circumstances)
Note: The user name is "root", the MySQL database server address is "127.0.0.1", and the password is "111". There must be a space between the three.
3. Shut down the MySQL server
Start -> Run Enter "cmd", and then enter the "net stop MySQL" command at the command prompt.
2. Operating MySQL database
1. Create a database
create database 数据库名;
2. View the database
show databases;
3. Select the specified database
use 数据库名;
4. Delete the database
drop database 数据库名;
Note: Automatically delete the "C:/AppServ/MySQL/data" folder in the MySQL installation directory.
3. Operation of MySQL data table
1. Create table
create table 表名 (column_name column_type not null,...);
Attribute description of create table statement
Attribute |
Description |
Attribute |
Description |
2. View the tables in the database
show tables;
3. View all tables in the database
show tables;(前提是使用use database 数据库;)
4. View the data table structure
describe 表名;
5. Modify the data table structure
alter table 表名 add [column] create_definition [first | after column_name] //添加新字段 add primary key (index_col_name,...) //添加主码名称 alter [column] col_name {set default literal |rop default} //修改字段名称 change [column] old_col_name create_definition //修改字段名及类型 modify [column] create_definition //修改字段类型 drop [column] col_name //删除字段 drop primary key //删除主码 rename [as] new_tablename //更改表名 eg:alter table Admin_Info drop A_Pwd, rename as Admin_Info2;
6. Delete the specified data table
drop table 表名;4. Manipulate MySQL data
1. Add table data
语法1:insert into 表名 values(值1,值2,...)(自增长的列应写null) 语法2:insert into 表名(字段1,字段2,...) values (值1,值2,...) 语法3:insert into 表名 set 字段1=值1,字段2=值2,...
2. Update table data
update 表名 set 字段1=值1 where 查询条件
If there are no query conditions, all data rows in the table will be modified.
3. Delete table data
delete from 表名 where 查询条件
If there are no query conditions, all data rows in the table will be deleted.
4. Query table data
select * from 表名;
5. Limit the number of query records
select * from 表名 limit[start] length
start: indicates which row of records to start outputting, 0 indicates the first row
The above is the detailed content of How to use mysql database. For more information, please follow other related articles on the PHP Chinese website!

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