技术教程 编程教程 MyBatis - 7.MyBatis逆向 Generator 正文

MyBatis - 7.MyBatis逆向 Generator

2023-06-12,,

MyBatis Generator：

简称MBG，是一个专门为MyBatis框架使用者定制的代码生成器，可以快速的根据表生成对应的映射文件，接口，以及bean类。支持基本的增删改查，以及QBC风格的条件查询。但是表连接、存储过程等这些复杂sql的定义需要我们手工编写
官方文档地址

http://www.mybatis.org/generator/
官方工程地址

https://github.com/mybatis/generator/releases

1.mbg配置文件编写

<?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>

  <context id="DB2Tables" targetRuntime="MyBatis3">

    <!--如和连接数据库-->

    <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"

      connectionURL="jdbc:mysql://localhost:4040/db_mybatis?serverTimezone = GMT"

      userId="root"

      password="123">

    </jdbcConnection>

    <javaTypeResolver>

      <property name="forceBigDecimals" value="false"/>

    </javaTypeResolver>

    <!--

      javaModelGenerator：指定javaBean生成策略

          - targetPackage="test.model":  目标包名

          - targetProject="\MBGTestProject\src"  目标工程

    -->

    <javaModelGenerator targetPackage="com.tangge.bean" targetProject=".\src">

      <property name="enableSubPackages" value="true"/>

      <property name="trimStrings" value="true"/>

    </javaModelGenerator>

    <!--

      sqlMapGenerator： sql映射XML生成策略

          - targetPackage="test.xml"：

          - targetProject="\MBGTestProject\src"：

    -->

    <sqlMapGenerator targetPackage="tangge.mapper" targetProject=".\src">

      <property name="enableSubPackages" value="true"/>

    </sqlMapGenerator>

    <!--

      javaClientGenerator：指定的mapper接口生成策略（Java客户端生成器的属性，Java客户端生成器构建Java接口和类。）

          - type="XMLMAPPER"：

              - XMLMAPPER	生成的对象将是MyBatis 3.x映射器基础结构的Java接口。接口将依赖于生成的XML映射器文件。

              - MIXEDMAPPER	接口将基于注释和XML的混合。将使用注释将在简单注释工作的地方使用。

                此客户端不会生成和Sql Provider，因此所有复杂的动态SQL都将以XML格式生成。

              - ANNOTATEDMAPPER	接口将基于注释和MyBatis 3.x SqlProviders。不会生成XML映射器文件。

          - targetPackage="test.dao"： 目标包名

          - targetProject=".\src"：  目标工程

    -->

    <javaClientGenerator type="XMLMAPPER" targetPackage="com.tangge.dao"

      targetProject=".\src">

      <property name="enableSubPackages" value="true"/>

    </javaClientGenerator>

    <!--<table schema="db_mybatis" tableName="tbl_employee" domainObjectName="Customer">-->

      <!--<property name="useActualColumnNames" value="true"/>-->

      <!--<generatedKey column="ID" sqlStatement="DB2" identity="true"/>-->

      <!--<columnOverride column="DATE_FIELD" property="startDate"/>-->

      <!--<ignoreColumn column="FRED"/>-->

      <!--<columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR"/>-->

    <!--</table>-->

    <!--

      table：表生成策略

          - tableName（必须）：表名

          - domainObjectName（选填）：生成类的名字

    -->

    <table schema="db_mybatis" tableName="tbl_employee" domainObjectName="Employee">

    </table>

    <table schema="db_mybatis" tableName="tbl_dept" domainObjectName="Department">

    </table>

  </context>

</generatorConfiguration>

1.1 如果不想生成Example类文件

table里面就关闭掉 enable** = "false"。

 <table tableName="tbl_employee" domainObjectName="Employee" enableCountByExample="false"

      enableDeleteByExample="false"  enableSelectByExample="false" enableSelectByPrimaryKey="true"

    enableUpdateByPrimaryKey="true" enableDeleteByPrimaryKey="true" selectByExampleQueryId="false"

      enableUpdateByExample="false">

    </table>

    <table  tableName="tbl_dept" domainObjectName="Department" enableCountByExample="false"

      enableDeleteByExample="false" enableUpdateByExample="false" enableSelectByExample="false"

      selectByExampleQueryId="false" enableSelectByPrimaryKey="true" enableUpdateByPrimaryKey="true"

      enableDeleteByPrimaryKey="true">

    </table>

2.mbg逆向生成

 @Test

    public void test()

            throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {

        List<String> warnings = new ArrayList<String>();

        boolean overwrite = true;

        File configFile = new File("mbg.xml");

        ConfigurationParser cp = new ConfigurationParser(warnings);

        Configuration config = cp.parseConfiguration(configFile);

        DefaultShellCallback callback = new DefaultShellCallback(overwrite);

        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);

        myBatisGenerator.generate(null);

    }

下面看看 生成的mapper.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.tangge.dao.EmployeeMapper">

  <resultMap id="BaseResultMap" type="com.tangge.bean.Employee">

    <!--

      WARNING - @mbg.generated

      This element is automatically generated by MyBatis Generator, do not modify.

      This element was generated on Mon Sep 03 10:51:01 CST 2018.

    -->

    <id column="id" jdbcType="INTEGER" property="id" />

    <result column="last_name" jdbcType="VARCHAR" property="lastName" />

    <result column="gender" jdbcType="CHAR" property="gender" />

    <result column="email" jdbcType="VARCHAR" property="email" />

    <result column="dept_id" jdbcType="INTEGER" property="deptId" />

  </resultMap>

  <sql id="Base_Column_List">

    <!--

      WARNING - @mbg.generated

      This element is automatically generated by MyBatis Generator, do not modify.

      This element was generated on Mon Sep 03 10:51:01 CST 2018.

    -->

    id, last_name, gender, email, dept_id

  </sql>

  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">

    <!--

      WARNING - @mbg.generated

      This element is automatically generated by MyBatis Generator, do not modify.

      This element was generated on Mon Sep 03 10:51:01 CST 2018.

    -->

    select

    <include refid="Base_Column_List" />

    from tbl_employee

    where id = #{id,jdbcType=INTEGER}

  </select>

  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">

    <!--

      WARNING - @mbg.generated

      This element is automatically generated by MyBatis Generator, do not modify.

      This element was generated on Mon Sep 03 10:51:01 CST 2018.

    -->

    delete from tbl_employee

    where id = #{id,jdbcType=INTEGER}

  </delete>

  <insert id="insert" parameterType="com.tangge.bean.Employee">

    <!--

      WARNING - @mbg.generated

      This element is automatically generated by MyBatis Generator, do not modify.

      This element was generated on Mon Sep 03 10:51:01 CST 2018.

    -->

    insert into tbl_employee (id, last_name, gender,

      email, dept_id)

    values (#{id,jdbcType=INTEGER}, #{lastName,jdbcType=VARCHAR}, #{gender,jdbcType=CHAR},

      #{email,jdbcType=VARCHAR}, #{deptId,jdbcType=INTEGER})

  </insert>

  <insert id="insertSelective" parameterType="com.tangge.bean.Employee">

    <!--

      WARNING - @mbg.generated

      This element is automatically generated by MyBatis Generator, do not modify.

      This element was generated on Mon Sep 03 10:51:01 CST 2018.

    -->

    insert into tbl_employee

    <trim prefix="(" suffix=")" suffixOverrides=",">

      <if test="id != null">

        id,

      </if>

      <if test="lastName != null">

        last_name,

      </if>

      <if test="gender != null">

        gender,

      </if>

      <if test="email != null">

        email,

      </if>

      <if test="deptId != null">

        dept_id,

      </if>

    </trim>

    <trim prefix="values (" suffix=")" suffixOverrides=",">

      <if test="id != null">

        #{id,jdbcType=INTEGER},

      </if>

      <if test="lastName != null">

        #{lastName,jdbcType=VARCHAR},

      </if>

      <if test="gender != null">

        #{gender,jdbcType=CHAR},

      </if>

      <if test="email != null">

        #{email,jdbcType=VARCHAR},

      </if>

      <if test="deptId != null">

        #{deptId,jdbcType=INTEGER},

      </if>

    </trim>

  </insert>

  <update id="updateByPrimaryKeySelective" parameterType="com.tangge.bean.Employee">

    <!--

      WARNING - @mbg.generated

      This element is automatically generated by MyBatis Generator, do not modify.

      This element was generated on Mon Sep 03 10:51:01 CST 2018.

    -->

    update tbl_employee

    <set>

      <if test="lastName != null">

        last_name = #{lastName,jdbcType=VARCHAR},

      </if>

      <if test="gender != null">

        gender = #{gender,jdbcType=CHAR},

      </if>

      <if test="email != null">

        email = #{email,jdbcType=VARCHAR},

      </if>

      <if test="deptId != null">

        dept_id = #{deptId,jdbcType=INTEGER},

      </if>

    </set>

    where id = #{id,jdbcType=INTEGER}

  </update>

  <update id="updateByPrimaryKey" parameterType="com.tangge.bean.Employee">

    <!--

      WARNING - @mbg.generated

      This element is automatically generated by MyBatis Generator, do not modify.

      This element was generated on Mon Sep 03 10:51:01 CST 2018.

    -->

    update tbl_employee

    set last_name = #{lastName,jdbcType=VARCHAR},

      gender = #{gender,jdbcType=CHAR},

      email = #{email,jdbcType=VARCHAR},

      dept_id = #{deptId,jdbcType=INTEGER}

    where id = #{id,jdbcType=INTEGER}

  </update>

</mapper>

3.Example的使用

QBC风格的带条件查询

@Test

public void test01(){

SqlSession openSession = build.openSession();

DeptMapper mapper = openSession.getMapper(DeptMapper.class);

DeptExample example = new DeptExample();

//所有的条件都在example中封装

Criteria criteria = example.createCriteria();

//select id, deptName, locAdd from tbl_dept WHERE

//( deptName like ? and id > ? )

criteria.andDeptnameLike("%部%");

criteria.andIdGreaterThan(2);

List<Dept> list = mapper.selectByExample(example);

for (Dept dept : list) {

	System.out.println(dept);

	}

}

MyBatis - 7.MyBatis逆向 Generator的相关教程结束。

《MyBatis - 7.MyBatis逆向 Generator.doc》

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