使用MyBatis Generator 1.3.7自動生成代碼

MyBatis Generator是一款mybatis自動代碼生成工具，可以通過配置后自動生成文件。

MyBatis Generator有幾種方法可以生成代碼，下面是其中一種。

 一、官網下載 MyBatis Generator

1、下載地址：https://github.com/mybatis/generator/releases
目前最新版本是1.3.7。
在命令行下自動創建代碼只需要下載mybatis-generator-core-1.3.7.zip即可。

2、壓縮包解壓后，主要是lib目錄，進去只有三個jar文件

 

 二、創建配置文件等

1、在lib目錄里面創建配置文件generatorConfig.xml，指定數據庫連接信息、生成模型和映射文件等信息：

<?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>
 
  <!--MySQL連接驅動-->
  <classPathEntry location="mysql-connector-java-5.1.37.jar" />
  
  <!--數據庫鏈接URL，用戶名、密碼 -->
  <context id="MySQL" targetRuntime="MyBatis3">
    <commentGenerator>  
            <property name="suppressDate" value="true"/>  
            <!-- 是否去除自動生成的注釋 true：是 ： false:否 -->  
            <property name="suppressAllComments" value="true"/>  
    </commentGenerator> 
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
        connectionURL="jdbc:mysql://127.0.0.1/test"
        userId="root"
        password="">
    </jdbcConnection>
 
    <!--是否啟用java.math.BigDecimal-->
    <javaTypeResolver >
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>
    <!-- 生成模型的包名和位置--> 
    <javaModelGenerator targetPackage="test.model" targetProject="src">
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>
    <!-- 生成映射文件的包名和位置--> 
    <sqlMapGenerator targetPackage="test.xml"  targetProject="src">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>
    <!-- 生成DAO的包名和位置--> 
    <javaClientGenerator type="XMLMAPPER" targetPackage="test.dao"  targetProject="src">
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>
    <!-- 要生成的表 tableName是數據庫中的表名或視圖名 domainObjectName是實體類名-->
    <table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
    </table>
    
  </context>
</generatorConfiguration>

2、因為的是mysql，所以在lib目錄里面還需要放入mysql驅動包，如mysql-connector-java-5.1.37.jar

3、配置文件指定輸出目錄為src（targetProject="src"），所以需要在lib目錄手動創建src目錄，最終文件如下：

三、命令行下生成代碼

1、在cmd命令行定位到D:\projects\mybatis-generator-core-1.3.7\lib

2、輸入命令java -jar mybatis-generator-core-1.3.7.jar -configfile generatorConfig.xml -overwrite
正常情況下會提示操作成功。

3、查看src目錄，已經生成3個子目錄，並且相應文件也在里面

4、UserMapper.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="test.dao.UserMapper">
  <resultMap id="BaseResultMap" type="test.model.User">
    <id column="Id" jdbcType="INTEGER" property="id" />
    <result column="Name" jdbcType="VARCHAR" property="name" />
    <result column="Sex" jdbcType="VARCHAR" property="sex" />
    <result column="Age" jdbcType="TINYINT" property="age" />
  </resultMap>
  <sql id="Base_Column_List">
    Id, Name, Sex, Age
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from user
    where Id = #{id,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from user
    where Id = #{id,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="test.model.User">
    insert into user (Id, Name, Sex, 
      Age)
    values (#{id,jdbcType=INTEGER}, #{name,jdbcType=VARCHAR}, #{sex,jdbcType=VARCHAR}, 
      #{age,jdbcType=TINYINT})
  </insert>
  <insert id="insertSelective" parameterType="test.model.User">
    insert into user
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="id != null">
        Id,
      </if>
      <if test="name != null">
        Name,
      </if>
      <if test="sex != null">
        Sex,
      </if>
      <if test="age != null">
        Age,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="id != null">
        #{id,jdbcType=INTEGER},
      </if>
      <if test="name != null">
        #{name,jdbcType=VARCHAR},
      </if>
      <if test="sex != null">
        #{sex,jdbcType=VARCHAR},
      </if>
      <if test="age != null">
        #{age,jdbcType=TINYINT},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="test.model.User">
    update user
    <set>
      <if test="name != null">
        Name = #{name,jdbcType=VARCHAR},
      </if>
      <if test="sex != null">
        Sex = #{sex,jdbcType=VARCHAR},
      </if>
      <if test="age != null">
        Age = #{age,jdbcType=TINYINT},
      </if>
    </set>
    where Id = #{id,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="test.model.User">
    update user
    set Name = #{name,jdbcType=VARCHAR},
      Sex = #{sex,jdbcType=VARCHAR},
      Age = #{age,jdbcType=TINYINT}
    where Id = #{id,jdbcType=INTEGER}
  </update>
</mapper>

5、User.java

package test.model;

public class User {
    private Integer id;

    private String name;

    private String sex;

    private Byte age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex == null ? null : sex.trim();
    }

    public Byte getAge() {
        return age;
    }

    public void setAge(Byte age) {
        this.age = age;
    }
}

6、UserMapper.java

package test.dao;

import test.model.User;

public interface UserMapper {
    int deleteByPrimaryKey(Integer id);

    int insert(User record);

    int insertSelective(User record);

    User selectByPrimaryKey(Integer id);

    int updateByPrimaryKeySelective(User record);

    int updateByPrimaryKey(User record);
}