Evaluate the pros and cons of MyBatis reverse engineering

MyBatis reverse engineering is a tool that automatically generates corresponding Java code from the database table structure. It is widely used in the development process due to its simplicity, ease of use, efficiency and speed. However, it also has some disadvantages. This article will evaluate MyBatis reverse engineering from two aspects: advantages and disadvantages, and provide specific code examples.

First, let’s take a look at the advantages of MyBatis reverse engineering.

1. Automatic code generation: MyBatis reverse engineering scans the database table structure and generates corresponding Java code based on the table structure. This eliminates the need for developers to manually write cumbersome ORM (Object Relational Mapping) code, greatly improving development efficiency. For example, we can use the MyBatis Generator plug-in to generate persistence layer code based on MyBatis.

The following is an example of using MyBatis Generator to generate Java entity classes:

<generatorConfiguration>
    <context id="testTables" targetRuntime="MyBatis3">
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
            connectionURL="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8"
            userId="root" password="root" />

        <javaModelGenerator targetPackage="com.example.model" targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <sqlMapGenerator targetPackage="com.example.mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <javaClientGenerator targetPackage="com.example.mapper" targetProject="src/main/java" type="XMLMAPPER">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <table tableName="user" domainObjectName="User" />
        <table tableName="order" domainObjectName="Order" />
    </context>
</generatorConfiguration>

2. Simplified code maintenance: Since the code is automatically generated, when the table structure changes , you only need to re-run the reverse engineering code generation process to quickly update the database operation code. In this way, the workload of manual code modification is reduced and the efficiency of code maintenance is improved.

Next, let’s take a look at some of the disadvantages of MyBatis reverse engineering.

1. The quality of generated code is limited: Although MyBatis reverse engineering can quickly generate code, the quality of the generated code is often limited. It simply generates the corresponding Java model based on the table structure, ignoring the complexity of the business. Therefore, developers still need to make further optimization and adjustments based on specific business needs.

For example, the code generated by MyBatis reverse engineering may only contain basic addition, deletion, modification and query methods. If complex query operations are required, developers need to manually add additional methods and conditions.

2. Difficulty in changing the data table structure: When the database table structure undergoes major changes, the code generated by reverse engineering is more difficult to maintain. At this point, you may need to manually modify and adjust the generated code, or regenerate the code. This increases development complexity and effort.

To sum up, we can see that MyBatis reverse engineering has the advantages of simplicity, ease of use, efficiency and speed, and can improve development efficiency and code maintenance effects. However, it also has shortcomings such as limited code quality and difficulty in changing the database table structure, which requires developers to make appropriate adjustments and optimizations in actual projects.

In short, MyBatis reverse engineering, as a very practical tool, can play an important role in project development, but it needs to be used flexibly based on the actual situation, and further optimization and adjustments should be made based on the generated code. Meet business needs.

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