MySQL develops small mall management system

One 、MySQL workbench Use

1、 open MySQL workbench The main interface of can be seen

2、 Connect to the existing database （ For example, the local instance mysql 80）

The password when connecting is set during installation , You can only use this machine without designing a password , Fill in the pop-up interface sql After the connection information of the database, click “Test connection” Can test connection . After successful connection, skip to the following page .

Upper figure 124 Three areas are commonly used ：

① Area 1“Navigator” Of “Administration” Are links to some common functions . and Schemas It's like a database , The database we will write later can be found in schemas see . The area in the figure above 1 What exists is the name of the database that has been created .

② Area 4 Displays the relevant information of the currently operated database and its tables

③ Area 2 For writing SQL, Conduct data operation, etc

3、 Create database

Click on schemas, Then right-click in the blank to select create schemas, In this way, you can create a new database , Fill in the database name and charset/collation I can click Apply To create （charset/collation Can be adjusted according to their own needs 、 I used it here utf-8 Of charset）. As long as you don't report mistakes, you'll go all the way Apply That's it .

After success Navigator In the view

These files store tables separately 、 View 、 stored procedure 、 Method .

4、 Create a table

Right click tables choice create table You can create a new table
Fill in... In turn Table Name and charset、engine etc. （ frequently-used engine Yes InnoDB and MyISAM）. After filling in the information of the entity, fill in the attribute information below ：
PK：primary key Primary key

NN：not null Non empty

UQ：unique unique index

BIN：binary binary data ( Than text Bigger )

UN：unsigned Unsigned （ Nonnegative number ）

ZF：zero fill fill 0 For example, the field content is 1 int(4), The content is displayed as 0001

AI：auto increment Self increasing
After selecting, click Apply, Automatically generate related sql Statement to create a table .

5、 Add data

stay Navigator Find the newly created table , Click the lightning sign to enter the data adding interface ：

add to 、 Click... After making changes Apply You can save it to the database .
We'll use query Page to check the database we created and its saved data ：

Got the data we just saved .yeah！

**** Some commonly used database operation instructions ：

1、 Database operation

show databases; // List databases

use database_name // Use database_name database

create database data_name // Create a data_name The database of

drop database data_name // Delete one named data_name The database of

2、 Table operations

show tables // List all the tables

create talbe tab_name(id int(10) not null auto_increment primary key,name varchar(40),pwd varchar(40)) charset=gb2312; Create a file called tab_name New table of

drop table tab_name Delete the name tab_name Data sheet for

describe tab_name // The display name is tab_name The data structure of the table

show columns from tab_name // ditto

delete from tab_name // Will table tab_name The records in are cleared

select * from tab_name // Display table tab_name Records in