Mybaits笔记框架:https://blog.csdn.net/qq_43751200/article/details/128154837
Mybatis中文官方文档: https://mybatis.org/mybatis-3/zh/index.html
Mybati的逆向工程
- 1. 正向工程 VS 逆向工程
- 2. 创建逆向工程的步骤(MyBatis3Simple清新简洁版)
- 2.1 添加依赖和插件
- 2.2 创建MyBatis的核心配置文件
- 2.3 创建逆向工程的配置文件
- 2.4 项目总体结构
- 2.5 执行MBG插件的generate目标
- 2.6 项目最终结构
- 2.7 生成的实体类、接口、配置文件查看
 
- 3. 创建逆向工程的步骤(MyBatis3奢华尊享版)
1. 正向工程 VS 逆向工程
-  正向工程:先创建Java实体类,由框架负责根据实体类生成数据库表。Hibernate是支持正向工程的 
-  逆向工程:先创建数据库表,由框架负责根据数据库表,反向生成如下资源: - Java实体类
- Mapper接口
- Mapper映射文件
 
2. 创建逆向工程的步骤(MyBatis3Simple清新简洁版)
2.1 添加依赖和插件
<?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>
    <groupId>org.example</groupId>
    <artifactId>mybatis_05_MBG</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.20</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
    </dependencies>
    <!-- 控制Maven在构建过程中相关配置 -->
    <build>
        <!-- 构建过程中用到的插件 -->
        <plugins>
            <!-- 具体插件,逆向工程的操作是以构建过程中插件形式出现的 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.0</version>
                <!-- 插件的依赖 -->
                <dependencies>
                    <!-- 逆向工程的核心依赖 -->
                    <dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.3.2</version>
                    </dependency>
                    <!-- 数据库连接池 -->
                    <dependency>
                        <groupId>com.mchange</groupId>
                        <artifactId>c3p0</artifactId>
                        <version>0.9.2</version>
                    </dependency>
                    <!-- MySQL驱动 -->
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.27</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>
2.2 创建MyBatis的核心配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 引入资源文件 -->
    <properties resource="jdbc.properties"/>
    <!--设置Mybatis的全局配置-->
    <settings>
        <!--将下划线_自动映射为驼峰,emp_name : empName -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!--开启延迟加载-->
        <setting name="lazyLoadingEnabled" value="true"/>
    </settings>
    <!-- 给实体类起别名 -->
    <typeAliases>
        <!--
        typeAlias:设置某个具体的类型的别名
        属性:
        type:需要设置别名的类型的全类名
        alias:设置此类型的别名,且别名不区分大小写。若不设置此属性,该类型拥有默认的别名,即类名
        -->
        <!--<typeAlias type="com.atguigu.mybatis.bean.User"></typeAlias>-->
        <!--<typeAlias type="com.atguigu.mybatis.bean.User" alias="user">
        </typeAlias>-->
        <!--以包为单位,设置改包下所有的类型都拥有默认的别名,即类名且不区分大小写-->
        <package name="com.atguigu.pojo"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <!-- 映射文件XXXMapper.xml所在的包 -->
    <mappers>
        <!--
        以包为单位,将包下所有的映射文件引入核心配置文件
        注意:
			1. 此方式必须保证mapper接口和mapper映射文件必须在相同的包下
			2. mapper接口要和mapper映射文件的名字一致
        -->
        <package name="com.atguigu.mapper"/>
    </mappers>
</configuration>
2.3 创建逆向工程的配置文件
逆向工程的配置文件名必须是:generatorConfig.xml
<?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>
    <!--
        targetRuntime: 执行生成的逆向工程的版本
        MyBatis3Simple: 生成基本的CRUD(清新简洁版)
        MyBatis3: 生成带条件的CRUD(奢华尊享版)
    -->
    <context id="DB2Tables" targetRuntime="MyBatis3Simple">
        <!-- 数据库的连接信息 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8"
                        userId="root"
                        password="1234">
        </jdbcConnection>
        <!-- javaBean的生成策略-->
        <javaModelGenerator targetPackage="com.atguigu.pojo" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- SQL映射文件的生成策略 -->
        <sqlMapGenerator targetPackage="com.atguigu.mapper"
                         targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- Mapper接口的生成策略 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.atguigu.mapper" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 逆向分析的表 -->
        <!-- tableName设置为*号,可以对应所有表,此时不写domainObjectName -->
        <!-- domainObjectName属性指定生成出来的实体类的类名 -->
        <table tableName="t_emp" domainObjectName="Emp"/>
        <table tableName="t_dept" domainObjectName="Dept"/>
    </context>
</generatorConfiguration>
2.4 项目总体结构

2.5 执行MBG插件的generate目标


2.6 项目最终结构

2.7 生成的实体类、接口、配置文件查看
Dept
package com.atguigu.pojo;
public class Dept {
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_dept.did
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    private Integer did;
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_dept.dept_name
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    private String deptName;
    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_dept.did
     *
     * @return the value of t_dept.did
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public Integer getDid() {
        return did;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_dept.did
     *
     * @param did the value for t_dept.did
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public void setDid(Integer did) {
        this.did = did;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_dept.dept_name
     *
     * @return the value of t_dept.dept_name
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public String getDeptName() {
        return deptName;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_dept.dept_name
     *
     * @param deptName the value for t_dept.dept_name
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public void setDeptName(String deptName) {
        this.deptName = deptName == null ? null : deptName.trim();
    }
}
Emp
package com.atguigu.pojo;
public class Emp {
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_emp.eid
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    private Integer eid;
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_emp.emp_name
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    private String empName;
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_emp.age
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    private Integer age;
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_emp.sex
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    private String sex;
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_emp.email
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    private String email;
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column t_emp.did
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    private Integer did;
    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_emp.eid
     *
     * @return the value of t_emp.eid
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public Integer getEid() {
        return eid;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_emp.eid
     *
     * @param eid the value for t_emp.eid
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public void setEid(Integer eid) {
        this.eid = eid;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_emp.emp_name
     *
     * @return the value of t_emp.emp_name
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public String getEmpName() {
        return empName;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_emp.emp_name
     *
     * @param empName the value for t_emp.emp_name
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public void setEmpName(String empName) {
        this.empName = empName == null ? null : empName.trim();
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_emp.age
     *
     * @return the value of t_emp.age
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public Integer getAge() {
        return age;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_emp.age
     *
     * @param age the value for t_emp.age
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public void setAge(Integer age) {
        this.age = age;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_emp.sex
     *
     * @return the value of t_emp.sex
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public String getSex() {
        return sex;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_emp.sex
     *
     * @param sex the value for t_emp.sex
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public void setSex(String sex) {
        this.sex = sex == null ? null : sex.trim();
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_emp.email
     *
     * @return the value of t_emp.email
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public String getEmail() {
        return email;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_emp.email
     *
     * @param email the value for t_emp.email
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public void setEmail(String email) {
        this.email = email == null ? null : email.trim();
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column t_emp.did
     *
     * @return the value of t_emp.did
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public Integer getDid() {
        return did;
    }
    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column t_emp.did
     *
     * @param did the value for t_emp.did
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    public void setDid(Integer did) {
        this.did = did;
    }
}
DeptMapper: 自动生成有增删改查方法
package com.atguigu.mapper;
import com.atguigu.pojo.Dept;
import java.util.List;
public interface DeptMapper {
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_dept
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    int insert(Dept record);
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_dept
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    List<Dept> selectAll();
}
EmpMapper: 自动生成有增删改查方法
package com.atguigu.mapper;
import com.atguigu.pojo.Emp;
import java.util.List;
public interface EmpMapper {
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_emp
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    int deleteByPrimaryKey(Integer eid);
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_emp
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    int insert(Emp record);
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_emp
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    Emp selectByPrimaryKey(Integer eid);
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_emp
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    List<Emp> selectAll();
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table t_emp
     *
     * @mbggenerated Tue Dec 13 10:17:42 CST 2022
     */
    int updateByPrimaryKey(Emp record);
}
DeptMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.atguigu.mapper.DeptMapper" >
  <resultMap id="BaseResultMap" type="com.atguigu.pojo.Dept" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Dec 13 10:17:42 CST 2022.
    -->
    <result column="did" property="did" jdbcType="INTEGER" />
    <result column="dept_name" property="deptName" jdbcType="VARCHAR" />
  </resultMap>
  <insert id="insert" parameterType="com.atguigu.pojo.Dept" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Dec 13 10:17:42 CST 2022.
    -->
    insert into t_dept (did, dept_name)
    values (#{did,jdbcType=INTEGER}, #{deptName,jdbcType=VARCHAR})
  </insert>
  <select id="selectAll" resultMap="BaseResultMap" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Dec 13 10:17:42 CST 2022.
    -->
    select did, dept_name
    from t_dept
  </select>
</mapper>
EmpMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.atguigu.mapper.EmpMapper" >
  <resultMap id="BaseResultMap" type="com.atguigu.pojo.Emp" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Dec 13 10:17:42 CST 2022.
    -->
    <id column="eid" property="eid" jdbcType="INTEGER" />
    <result column="emp_name" property="empName" jdbcType="VARCHAR" />
    <result column="age" property="age" jdbcType="INTEGER" />
    <result column="sex" property="sex" jdbcType="CHAR" />
    <result column="email" property="email" jdbcType="VARCHAR" />
    <result column="did" property="did" jdbcType="INTEGER" />
  </resultMap>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Dec 13 10:17:42 CST 2022.
    -->
    delete from t_emp
    where eid = #{eid,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.atguigu.pojo.Emp" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Dec 13 10:17:42 CST 2022.
    -->
    insert into t_emp (eid, emp_name, age, 
      sex, email, did)
    values (#{eid,jdbcType=INTEGER}, #{empName,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER}, 
      #{sex,jdbcType=CHAR}, #{email,jdbcType=VARCHAR}, #{did,jdbcType=INTEGER})
  </insert>
  <update id="updateByPrimaryKey" parameterType="com.atguigu.pojo.Emp" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Dec 13 10:17:42 CST 2022.
    -->
    update t_emp
    set emp_name = #{empName,jdbcType=VARCHAR},
      age = #{age,jdbcType=INTEGER},
      sex = #{sex,jdbcType=CHAR},
      email = #{email,jdbcType=VARCHAR},
      did = #{did,jdbcType=INTEGER}
    where eid = #{eid,jdbcType=INTEGER}
  </update>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Dec 13 10:17:42 CST 2022.
    -->
    select eid, emp_name, age, sex, email, did
    from t_emp
    where eid = #{eid,jdbcType=INTEGER}
  </select>
  <select id="selectAll" resultMap="BaseResultMap" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Tue Dec 13 10:17:42 CST 2022.
    -->
    select eid, emp_name, age, sex, email, did
    from t_emp
  </select>
</mapper>
3. 创建逆向工程的步骤(MyBatis3奢华尊享版)
只需要修改generatorConfig.xml配置文件,将targetRuntime="MyBatis3Simple"修改为targetRuntime="MyBatis3"即可
<?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>
    <!--
        targetRuntime: 执行生成的逆向工程的版本
        MyBatis3Simple: 生成基本的CRUD(清新简洁版)
        MyBatis3: 生成带条件的CRUD(奢华尊享版)
    -->
    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!-- 数据库的连接信息 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8"
                        userId="root"
                        password="1234">
        </jdbcConnection>
        <!-- javaBean的生成策略-->
        <javaModelGenerator targetPackage="com.atguigu.pojo" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- SQL映射文件的生成策略 -->
        <sqlMapGenerator targetPackage="com.atguigu.mapper"
                         targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- Mapper接口的生成策略 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.atguigu.mapper" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 逆向分析的表 -->
        <!-- tableName设置为*号,可以对应所有表,此时不写domainObjectName -->
        <!-- domainObjectName属性指定生成出来的实体类的类名 -->
        <table tableName="t_emp" domainObjectName="Emp"/>
        <table tableName="t_dept" domainObjectName="Dept"/>
    </context>
</generatorConfiguration>
生成的项目框架

测试方法
 @Test
    public void testMethod(){
        try {
            InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
            SqlSession sqlSession = sqlSessionFactory.openSession(true);
            EmpMapper empMapper = sqlSession.getMapper(EmpMapper.class);
            // 根据条件查询
            EmpExample empExample = new EmpExample();
            // 标准一:name为lsm且年龄等于231
            empExample.createCriteria().andEmpNameEqualTo("lsm").andAgeEqualTo(231);
            // 标准二与标准一or的关系,did不为空
            empExample.or().andDidIsNotNull();
            List<Emp> empList = empMapper.selectByExample(empExample);
            empList.forEach(emp -> System.out.println(emp));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


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