Detailed explanation of MyBatis-Plus key generation code and database operations

Detailed explanation of MyBatis-Plus key generation code and database operations

In database operations, the generation of keys is an important link, which ensures the uniqueness and relevance of data. MyBatis-Plus is a popular Java persistence layer framework that provides many convenient features to simplify database operations. This article will introduce in detail how to use MyBatis-Plus to generate key codes and give corresponding sample codes.

Generating key codes means automatically generating unique key values ​​when inserting data into the database. This is important to avoid data conflicts and maintain database consistency. In MyBatis-Plus, we can generate keys by using annotations or configuration files.

1. Generate key codes using annotations

Adding annotations on the attributes of the entity class can achieve automatic generation of keys. MyBatis-Plus provides @TableIdand @TableFieldannotations to define primary keys and fields. Among them, @TableIdannotations can specify the primary key generation strategy. Common ones include the following:

• AUTO: automatic growth
• INPUT:User input
• ID_WORKER: Globally unique ID (Long type)
• UUID: Globally unique ID (string type)

The following is a @TableIdsample code that uses annotations to automatically generate primary keys:

import com