⬇参考代码：demo5

MyBatis 逆向工程

1⃣添加依赖：

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.liangjiajia.cs</groupId>
        <artifactId>mybatis-demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>demo5</artifactId>

    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.0</version>
                <dependencies>
                    <dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.3.2</version>
                    </dependency>
                    <dependency>
                        <groupId>com.alibaba</groupId>
                        <artifactId>druid</artifactId>
                        <version>1.2.21</version>
                    </dependency>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.27</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

2⃣创建逆向工程的配置文件 generatorConfig.xml\text {generatorConfig.xml}

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!-- 定义一个上下文环境，id 为标识，targetRuntime 指定生成代码的 MyBatis 版本 -->
    <context id="DB2Tables" targetRuntime="MyBatis3">

        <!-- 数据库连接配置，包括 JDBC 驱动、连接URL、用户名和密码 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/northwind"
                        userId="root"
                        password="root">
        </jdbcConnection>

        <!-- Java 模型生成器配置，指定实体类的包名和生成位置 -->
        <javaModelGenerator targetPackage="com.liangjiajia.cs.pojo" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/> <!-- 允许生成子包 -->
            <property name="trimStrings" value="true"/> <!-- 去除字符串字段的前后空格 -->
        </javaModelGenerator>

        <!-- SQL 映射文件生成器配置，指定 Mapper XML 文件的包名和生成位置 -->
        <sqlMapGenerator targetPackage="com.liangjiajia.cs.mapper" targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true"/> <!-- 允许生成子包 -->
        </sqlMapGenerator>

        <!-- Java 客户端代码生成器配置，指定 Mapper 接口的包名和生成位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.liangjiajia.cs.mapper" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/> <!-- 允许生成子包 -->
        </javaClientGenerator>

        <!--<table tableName="your_table_name" domainObjectName="YourModelName"/>-->
        <table tableName="customer" domainObjectName="Customer"/>
    </context>
</generatorConfiguration>

3⃣执行 mybatis-generator\text {mybatis-generator} 插件的 generator\text {generator} 功能

简单测试：

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@Test
public void testSelectByPrimaryKey(){
    SqlSession sqlSession = SqlSessionUtils.getSqlSession();
    CustomerMapper customerMapper = sqlSession.getMapper(CustomerMapper.class);
    Customer customer = customerMapper.selectByPrimaryKey(1);
    System.out.println(customer);
}
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@Test
public void testUpdateByPrimaryKeySelective(){
    SqlSession sqlSession = SqlSessionUtils.getSqlSession();
    CustomerMapper customerMapper = sqlSession.getMapper(CustomerMapper.class);
    CustomerExample customerExample=new CustomerExample();
    customerExample.createCriteria().andCustomeridBetween(1,5);
    List<Customer> customers=customerMapper.selectByExample(customerExample);
    customers.forEach(System.out::println);
}

MyBatis 分页

1⃣添加依赖：

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<dependencies>
    <dependency>
        <groupId>com.github.pagehelper</groupId>
        <artifactId>pagehelper</artifactId>
        <version>5.2.0</version>
    </dependency>
</dependencies>

2⃣配置​

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<plugins>
    <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
</plugins>

简单测试：

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@Test
public void testPageHelper(){
    SqlSession sqlSession = SqlSessionUtils.getSqlSession();
    CustomerMapper customerMapper = sqlSession.getMapper(CustomerMapper.class);
    PageHelper.startPage(4, 5);
    List<Customer> customers=customerMapper.selectByExample(null);
    PageInfo<Customer> pageInfo=new PageInfo<>(customers,3);
    customers.forEach(System.out::println);
    System.out.println(pageInfo);
}