Detailed introduction and optimization suggestions for MyBatis Generator configuration file

MyBatis Generator configuration file detailed introduction and optimization suggestions

MyBatis Generator is a tool used to generate MyBatis persistence layer code. The corresponding Java can be generated through simple configuration Persistence layer code helps developers improve development efficiency. In actual projects, reasonable configuration files can help improve the accuracy and efficiency of code generation. This article will introduce the configuration file of MyBatis Generator in detail and give some sample codes that suggest optimization.

1. Configuration file introduction

The configuration file of MyBatis Generator is usually generatorConfig.xml, which contains various settings for configuring the generated code, such as database Connection information, table mapping and generated file types, etc.

1.1 Database connection configuration

In the configuration file, you first need to configure the connection information of the data source, including database driver, connection URL, user name and password, etc. The following is an example:

<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                connectionURL="jdbc:mysql://localhost:3306/my_database"
                userId="username"
                password="password">
</jdbcConnection>

1.2 Table mapping configuration

Next, you need to configure the database table information to generate code, including table name, generated entity class name, whether to generate Mapper interface, etc. . An example is as follows:

<table schema="my_schema" tableName="user" domainObjectName="User" enableSelectByExample="false">
</table>

1.3 Generated file configuration

Finally, you need to configure the generated file type and output path and other information. An example is as follows:

<javaModelGenerator targetPackage="com.example.model" targetProject="src/main/java">
</javaModelGenerator>

<sqlMapGenerator targetPackage="com.example.mapper" targetProject="src/main/resources">
</sqlMapGenerator>

<javaClientGenerator targetPackage="com.example.mapper" targetProject="src/main/java">
</javaClientGenerator>

2. Configuration optimization suggestions

In actual projects, some optimizations can be made to the configuration file as needed to improve the quality and efficiency of the generated code.

2.1 Using plug-ins

MyBatis Generator supports plug-in mechanism, and the generated code can be extended through plug-ins. For example, you can use the MBGPlugin plug-in to customize the behavior of generated code, such as custom comments, generating additional code, etc.

<plugin type="com.example.plugins.MBGPlugin">
    <property name="tableName" value="user"/>
</plugin>

2.2 Custom template

In addition to using the default generated template, you can also customize the template for generating code to meet specific needs. The path to the custom template can be specified through template configuration:

<context id="MyBatisGenerator" targetRuntime="MyBatis3">
    <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
    <!-- 自定义模板路径 -->
    <template path="templates/MyCustomModel.ftl" targetPackage="com.example.model" targetProject="src/main/java" type="MODEL"/>
</context>

2.3 Configuring the generation strategy

You can adjust the generated strategy according to specific needs and set relevant settings in the configuration file options. For example, you can configure enableInsertSelective to control whether to generate the judgment logic for null fields in the insertion method.

<table tableName="user" domainObjectName="User" enableInsertSelective="true">
</table>

Conclusion

Through the detailed introduction and optimization suggestions of the MyBatis Generator configuration file, I hope to help developers better use this tool and improve project development efficiency and code quality. In practical applications, reasonable configuration according to specific project needs will achieve better results.

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