MyBatis-Generato代码生成器（独立版）

项目背景

这个是2014年2015年在mybatis大规模应用的时候自己研究出来的一个mybatis代码生成器，好久没有用了，官方也没有怎么大规模更新，毕竟好用的民间工具太多，好用的是大家的思维和sql。mybatis的强大之处在于把任何复杂的sql，包括多表关联，包括多重计算，处理之后映射到任意一个实体上，以达到查询的目的。

相关资料下载

• 百度网盘: https://pan.baidu.com/s/10h1n9PNX891O19YerX4PqQ 密码: pta3
• CSDN https://download.csdn.net/download/moshowgame/10424926
  建表语句

---

CREATE TABLE `sys_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '用户id',
  `username` varchar(255) DEFAULT NULL COMMENT '账号',
  `password` varchar(255) DEFAULT NULL COMMENT '密码',
  `user_type` int(11) DEFAULT NULL COMMENT '用户类型',
  `createtime` datetime DEFAULT NULL COMMENT '创建时间',
  `lastupdatetime` datetime DEFAULT NULL COMMENT '最后更新时间',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

配置Generator的xml

自动生成entity/XML/mapper/DAO的配置，注释我写得很详细了

<generatorConfiguration>

	
	

	
	
	
	<classPathEntry
		location="C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.46\mysql-connector-java-5.1.46.jar" />
	<context id="DB2Tables" targetRuntime="MyBatis3">

		
		<commentGenerator>
			<property name="suppressAllComments" value="false" />
		commentGenerator>

		
		<jdbcConnection driverClass="com.mysql.jdbc.Driver"
			connectionURL="jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf8"
			userId="root" password="root">
		jdbcConnection>
		


		<javaTypeResolver>
			<property name="forceBigDecimals" value="true" />
			
		javaTypeResolver>

		
		
		<javaModelGenerator targetPackage="com.tcbj.checksys.user.domain"
			targetProject="D:\workspace\temp">
			<property name="enableSubPackages" value="true" />
			<property name="trimStrings" value="true" />
			
		javaModelGenerator>
 		
 		<sqlMapGenerator targetPackage="com.tcbj.checksys.user.persistence"
			targetProject="D:\workspace\temp">
			<property name="enableSubPackages" value="true" />
			 
		sqlMapGenerator>
		
		
		<javaClientGenerator type="XMLMAPPER"
			targetPackage="com.tcbj.checksys.user.persistence" 
			targetProject="D:\workspace\temp">
			<property name="enableSubPackages" value="true" />
		javaClientGenerator>

		
		
 		<table tableName="sys_user" domainObjectName="User"
			enableCountByExample="false" 
			enableUpdateByExample="false" 
			enableDeleteByExample="false" 
			enableSelectByExample="false" 
			selectByExampleQueryId="false" 
			/>
	context>
generatorConfiguration>

开始生成

接下来进入到目录手工运行@mybatisGenerator.bat

• 如果提示“The specified target project directory D:\Workspaces\temp does not exist”是因为指定的生成目录不存在，记得要创建

• 提示以下这个是因为已经生成过了，所以每次都会重新覆盖，如果是加了新字段，你可以直接copy实体，然后mapper的xml自己加就可以了。

Existing file D:\workspace\temp\com\tcbj\checksys\user\domain\User.java was overwritten
Existing file D:\workspace\temp\com\tcbj\checksys\user\persistence\UserMapper.java was overwritten

• 如果你觉得生成一大堆注释很烦，可以调整一下，把这个suppressAllComments的值设置为true，就可以少一堆啰嗦的注释，比较干净

		<commentGenerator>
			<property name="suppressAllComments" value="true" />
		commentGenerator>

验收生成结果

package com.tcbj.checksys.user.domain;

import java.util.Date;

public class User {
    private Integer id;
    private String username;
    private String password;
    private Integer userType;
    private Date createtime;
    private Date lastupdatetime;
    //这里对应的set、get我先删了，生成是有的，我们看下精华部分就行
}

package com.tcbj.checksys.user.persistence;

import com.tcbj.checksys.user.domain.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);
}

mapper才是mybatis的精华

<mapper namespace="com.tcbj.checksys.user.persistence.UserMapper">
  <resultMap id="BaseResultMap" type="com.tcbj.checksys.user.domain.User">
    <id column="id" jdbcType="INTEGER" property="id" />
    <result column="username" jdbcType="VARCHAR" property="username" />
    <result column="password" jdbcType="VARCHAR" property="password" />
    <result column="user_type" jdbcType="INTEGER" property="userType" />
    <result column="createtime" jdbcType="TIMESTAMP" property="createtime" />
    <result column="lastupdatetime" jdbcType="TIMESTAMP" property="lastupdatetime" />
  resultMap>
  <sql id="Base_Column_List">
    id, username, password, user_type, createtime, lastupdatetime
  sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from sys_user
    where id = #{id,jdbcType=INTEGER}
  select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from sys_user
    where id = #{id,jdbcType=INTEGER}
  delete>
  <insert id="insert" parameterType="com.tcbj.checksys.user.domain.User">
    insert into sys_user (id, username, password, 
      user_type, createtime, lastupdatetime
      )
    values (#{id,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
      #{userType,jdbcType=INTEGER}, #{createtime,jdbcType=TIMESTAMP}, #{lastupdatetime,jdbcType=TIMESTAMP}
      )
  insert>
  <insert id="insertSelective" parameterType="com.tcbj.checksys.user.domain.User">
    insert into sys_user
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="id != null">
        id,
      if>
      <if test="username != null">
        username,
      if>
      <if test="password != null">
        password,
      if>
      <if test="userType != null">
        user_type,
      if>
      <if test="createtime != null">
        createtime,
      if>
      <if test="lastupdatetime != null">
        lastupdatetime,
      if>
    trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="id != null">
        #{id,jdbcType=INTEGER},
      if>
      <if test="username != null">
        #{username,jdbcType=VARCHAR},
      if>
      <if test="password != null">
        #{password,jdbcType=VARCHAR},
      if>
      <if test="userType != null">
        #{userType,jdbcType=INTEGER},
      if>
      <if test="createtime != null">
        #{createtime,jdbcType=TIMESTAMP},
      if>
      <if test="lastupdatetime != null">
        #{lastupdatetime,jdbcType=TIMESTAMP},
      if>
    trim>
  insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.tcbj.checksys.user.domain.User">
    update sys_user
    <set>
      <if test="username != null">
        username = #{username,jdbcType=VARCHAR},
      if>
      <if test="password != null">
        password = #{password,jdbcType=VARCHAR},
      if>
      <if test="userType != null">
        user_type = #{userType,jdbcType=INTEGER},
      if>
      <if test="createtime != null">
        createtime = #{createtime,jdbcType=TIMESTAMP},
      if>
      <if test="lastupdatetime != null">
        lastupdatetime = #{lastupdatetime,jdbcType=TIMESTAMP},
      if>
    set>
    where id = #{id,jdbcType=INTEGER}
  update>
  <update id="updateByPrimaryKey" parameterType="com.tcbj.checksys.user.domain.User">
    update sys_user
    set username = #{username,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      user_type = #{userType,jdbcType=INTEGER},
      createtime = #{createtime,jdbcType=TIMESTAMP},
      lastupdatetime = #{lastupdatetime,jdbcType=TIMESTAMP}
    where id = #{id,jdbcType=INTEGER}
  update>
mapper>