What is the storage structure and mode of data in the database?

A database is a warehouse for storing and managing data , But databases do not store data directly , Data is stored in tables , The database server must be used in the process of storing data , The so-called database server is to install a database management program on the computer , Such as MySQL. database 、 surface 、 The relationship between database servers , As shown in the figure .

database server 、 database 、 Table diagram

As can be seen from the above figure , A database server can manage multiple databases , Usually, developers create a database for each application , To save the data of the entity in the application , Multiple tables will be created in the database （ A logical structure for storing and describing data ）, Each table records information about the entity . For beginners , It must be difficult to understand how entity data in an application is stored in a table , I 'll describe it with a legend , As shown in the figure .

Table data

It describes User The structure of the table and how the data is stored , The horizontal direction of the table is called row , Vertical is called column , The content of each line is called a record , The column name of each column is called a field , Such as id、name etc. . By observing the table, it can be found that ,User Every record in the table , Such as 1lisi23, It's actually a User object .