Analyze the advantages and disadvantages of MyBatis reverse engineering

To analyze the advantages and disadvantages of MyBatis reverse engineering, specific code examples are needed

Chinese summary:
MyBatis is a very popular Java persistence framework that provides With the reverse engineering function, it can automatically generate model objects and corresponding SQL statements based on the database table structure. This article will analyze MyBatis reverse engineering from two aspects: advantages and disadvantages, and give specific code examples to help readers better understand.

Text:
1. Advantages of MyBatis reverse engineering

1. Improve development efficiency: Through reverse engineering, developers can automatically generate model objects and corresponding CRUD based on the database table structure The operating SQL statements avoid manually writing a large amount of repetitive code, which greatly improves development efficiency.
2. Synchronicity of database and code: When the database table structure changes, developers only need to re-run the reverse engineering code generator to automatically update model objects and SQL statements to maintain synchronization of the database and code. It reduces the tedious process of manual modification.
3. Reduce the possibility of errors: The code automatically generated by reverse engineering is generated based on the database table structure, which reduces the errors that may be caused by manually writing the code and improves the quality and stability of the code.
4. Support custom templates: MyBatis reverse engineering provides template configuration functions. Developers can customize templates as needed to meet specific business needs. For example, you can add support for paging queries and generate query statements with paging functionality.

2. Disadvantages of MyBatis reverse engineering

1. The amount of generated code is too large: Reverse engineering will automatically generate model objects, Mapper interfaces and corresponding XML files, etc. A large amount of code, for complex database structures, may generate a huge amount of code, increasing the size of the project.
2. Unconventional operations are not supported: The code generated by reverse engineering is mainly for basic operations such as adding, deleting, modifying, and querying tables. For some unconventional database operations, such as cross-table queries, joint queries, etc. When writing SQL statements, reverse engineering is powerless, and developers still need to manually write code to complete it.
3. The readability of the generated code is low: The code automatically generated by reverse engineering is usually generated based on the database table structure. For some database tables with insufficient naming standards, the generated code may appear lengthy and difficult to understand. , developers may need to make certain code optimizations and adjustments.

Specific code examples:
The following code examples use MyBatis reverse engineering to generate a simple User model and corresponding SQL statements.

1. User model object generation:

public class User {
    private Long id;
    private String name;
    private Integer age;
    
    // getters and setters
}

2. UserMapper interface generation:

public interface UserMapper {
    int deleteByPrimaryKey(Long id);
    
    int insert(User record);
    
    User selectByPrimaryKey(Long id);
    
    List<User> selectAll();
    
    int updateByPrimaryKey(User record);
}

3. UserMapper.xml generation:

<mapper namespace="com.example.mapper.UserMapper">
    <resultMap id="BaseResultMap" type="com.example.model.User">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="name" property="name" jdbcType="VARCHAR"/>
        <result column="age" property="age" jdbcType="INTEGER"/>
    </resultMap>
    
    <sql id="Base_Column_List">
        id, name, age
    </sql>
    
    <select id="selectByPrimaryKey" resultMap="BaseResultMap">
        select
        <include refid="Base_Column_List"/>
        from user
        where id = #{id}
    </select>
    
    <!-- 其他SQL语句略 -->
</mapper>

Through the above code examples, you can clearly see the User model object, Mapper interface and corresponding XML file automatically generated by MyBatis reverse engineering, which saves developers from the manual writing process.

Conclusion:
MyBatis reverse engineering has obvious advantages in improving development efficiency, maintaining database and code synchronization, and reducing the possibility of errors. However, there are some disadvantages in terms of excessive amount of generated code, unsupported non-routine operations, and low readability of generated code. Therefore, when using MyBatis for reverse engineering, developers need to weigh its advantages and disadvantages and make reasonable choices and adjustments based on specific needs.

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