MyBatis Generator configuration optimization strategies and performance tuning suggestions

MyBatis Generator automated code generation tool is a very convenient tool that can help developers quickly generate entity classes, DAO interfaces and basic add, delete, modify and query methods corresponding to database tables, reducing the number of The duplication of development work improves development efficiency. However, in actual use, many developers may encounter some performance problems or improper configuration, resulting in unsatisfactory code generation effects. Therefore, this article will discuss the configuration optimization strategies and performance tuning suggestions of MyBatis Generator, combined with specific code examples to help readers better use this tool.

1. Configuration optimization strategy

1.1 Database connection configuration

When configuring MyBatis Generator, the first thing to pay attention to is the configuration of the database connection to ensure that the connection information is correct. You can set the correct data source information in the generatorConfig.xml file, including database connection address, user name, password, etc.

The sample code is as follows:

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

1.2 Generator configuration

In the generatorConfig.xml file you can also configure some parameters of the generator, including generating Java class package name, file path, comment format, etc. These configurations can be adjusted based on project specifics to meet project needs.

The sample code is as follows:

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

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

<javaClientGenerator targetPackage="com.example.dao"
                     targetProject="src/main/java"
                     type="XMLMAPPER">
</javaClientGenerator>

1.3 Data table configuration

When configuring the data table, you can specify the data table that needs to generate code, and whether to generate entity classes and DAO interfaces , XML mapping files, etc. Specific data table information can be specified by setting the <table> tag.

The sample code is as follows:

<table tableName="user" domainObjectName="User"
       enableSelectByExample="false"
       enableDeleteByExample="false"
       enableCountByExample="false"
       enableUpdateByExample="false"
       enableInsert="false"
       enableSelectByPrimaryKey="true"/>

2. Performance tuning suggestions

2.1 Use lazy loading

In the generated entity class, MyBatis Generator will Generate some attributes of the related table, but these attributes will not be loaded immediately when querying, but will be loaded when needed. This lazy loading method can improve query performance and reduce unnecessary data transmission.

The sample code is as follows:

public class User {
    private Integer id;
    private String username;
    private List<Order> orders; // 延迟加载
}

2.2 Batch operation optimization

In the generated DAO interface, MyBatis Generator provides the method of adding, deleting, modifying and querying single data by default, but in In actual development, we often need to perform batch operations. Therefore, you can add batch operation methods according to your needs to improve operation efficiency.

The sample code is as follows:

public interface UserMapper {
    int insertBatch(List<User> userList);
    int updateBatch(List<User> userList);
    int deleteBatch(List<Integer> userIds);
}

2.3 SQL optimization

In the generated SQL mapping file, you can improve query performance by writing efficient SQL statements. Try to avoid using fuzzy query fields such as select * in SQL. Instead, clearly specify the fields that need to be queried to reduce the amount of data transmission.

The sample code is as follows:

<select id="selectUserById" parameterType="java.lang.Integer" resultType="com.example.model.User">
    SELECT id, username, age
    FROM user
    WHERE id = #{id}
</select>

Conclusion

Through reasonable configuration optimization strategies and performance tuning suggestions, developers can make better use of the MyBatis Generator tool to generate efficient and Elegant code improves development efficiency. We hope that the content provided in this article can help readers better understand and use this tool, while achieving better results in actual project development.

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