What is the detailed explanation of the mybatis tag?

mybatis tags include: 1. 221f08282418e2996498697df914ce4e tag; 2. 3cdbca7b6e47052f0af62aa0d4c6123a tag; 3. 48dd0c1f550330068948da43aff71ce0 tag; 4. 5cc62b85a20462d19109e58cc4ad0bf9 tag; 5. 68a9ca67c267b134c127fbeac6659d23 tag; 6. 9542a02f6b273f92cc32f0b46d9d2305 tag; 7. b1ad4dfa55764331df0e2838b34df3ff tag; 8. dcf91641426a34cf32ecc36140f28baf tag. Detailed introduction: 1. The 221f08282418e2996498697df914ce4e tag is used to define a query SQL statement; 2. The 3cdbca7b6e47052f0af62aa0d4c6123a tag is used to define an insert data, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

MyBatis is an excellent persistence layer framework that supports customized SQL, stored procedures and advanced mapping. In MyBatis, labels are important elements for configuring SQL statements and mapping relationships. Commonly used tags in MyBatis will be explained in detail below:

1, 221f08282418e2996498697df914ce4e Tag

Function: Used to define a query SQL statement.

Attributes: id, resultType, parameterType, sql fragment, etc.

Example:

xml`<select id="selectUserById" parameterType="int" resultType="User">  
  SELECT * FROM user WHERE id = #{id}  
</select>`

2. 3cdbca7b6e47052f0af62aa0d4c6123a tag

Function: Used to define a SQL statement for inserting data.

Attributes: id, parameterType, useGeneratedKeys, keyProperty, etc.

Example:

xml`<insert id="insertUser" parameterType="User">  
  INSERT INTO user (name, age) VALUES (#{name}, #{age})  
</insert>`

3. 48dd0c1f550330068948da43aff71ce0 tag

Function: Used to define a SQL statement that updates data.

Attributes: id, parameterType.

Example:

xml`<update id="updateUser">  
  UPDATE user SET name=#{name}, age=#{age} WHERE id=#{id}  
</update>`

4. 5cc62b85a20462d19109e58cc4ad0bf9 tag

Function: Used to define a SQL statement to delete data.

Attributes: id, parameterType.

Example:

xml`<delete id="deleteUserById">  
  DELETE FROM user WHERE id=#{id}  
</delete>`

5, 68a9ca67c267b134c127fbeac6659d23 tag

Function: Define the mapping rules of the result set. It is often used within the 221f08282418e2996498697df914ce4e tag.

Attributes: id, type, autoMapping, etc.

Example:

xml`<resultMap id="UserResultMap" type="User">  
  <id property="id" column="id"/>  
  <result property="name" column="name"/>  
  <result property="age" column="age"/>  
</resultMap>`

6, 9542a02f6b273f92cc32f0b46d9d2305 tag

Function: Define type aliases to facilitate the use of short type names.

Attributes: id, type.

Example:

xml`<typeAliases>  
  <typeAlias alias="User" type="com.example.User"/>  
</typeAliases>`

7, b1ad4dfa55764331df0e2838b34df3ff tag

Function: Define reusable SQL fragments. It is often used in other SQL statements and is referenced through ${}.

Attribute: id.

Example:

xml`<sql id="userColumns">name, age</sql>  
<select id="selectUsers" resultType="User">  
  SELECT ${userColumns} FROM user  
</select>`

8, dcf91641426a34cf32ecc36140f28baf tag (Note: In newer versions of MyBatis, it is recommended to use b1ad4dfa55764331df0e2838b34df3ff and ${} to Reference SQL fragment)

Function: Introduce the defined SQL fragment. It is often used in other SQL statements.

Attribute: id.

Example: 8765000f46f1cfb9735ffc7b073fba48 (same as b1ad4dfa55764331df0e2838b34df3ff example)

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