mybatis-generator【mybatis代码自动生成】

一、简介

mybatis属于半自动的ORM，使用其需要大量的编写Mapping的映射文件xml。因此可能会需要大量的时间，浪费开发时间。mybatis-generator是一个可以方便快速自动生成对应表的mapping映射文件xml。

二、准备

需要三个jar包和一个配置文件xml



三、配置generator



注意：因为mybatis是半自动的，所以数据库必须要有表，所以还是需要手动建表。

<?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>
<!-- 数据库驱动包位置 -->
<classPathEntry location="E:\generator\mysql-connector-java-5.1.24-bin.jar" />
<!-- <classPathEntry location="C:\oracle\product\10.2.0\db_1\jdbc\lib\ojdbc14.jar" />-->
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressAllComments" value="true" />
</commentGenerator>
<!-- 数据库链接URL、用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8" userId="root" password="12345678">
<!-- <jdbcConnection driverClass="oracle.jdbc.driver.OracleDriver" connectionURL="jdbc:oracle:thin:@localhost:1521:orcl" userId="msa" password="msa"> -->
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- 生成模型的包名和位置 -->
<javaModelGenerator targetPackage="com.wuhn.bean" targetProject="D:\Users\Administrator\Workspaces\MyEclipse 10\test\src">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- 生成的映射文件包名和位置 -->
<sqlMapGenerator targetPackage="com.wuhn.mapping" targetProject="D:\Users\Administrator\Workspaces\MyEclipse 10\test\src">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<!-- 生成DAO的包名和位置 -->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.wuhn.dao" targetProject="D:\Users\Administrator\Workspaces\MyEclipse 10\test\src">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<!-- 要生成那些表(更改tableName和domainObjectName就可以) -->
<table tableName="user_info" domainObjectName="Test" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false" />

</context>
</generatorConfiguration>

四、使用

1、在window下操作

2、打开cmd，进入文件夹

3、使用命令

java -jar mybatis-generator-core-1.3.2.jar -configfile generator.xml -overwrite



自动生成三个文件



UserMapper.java

package com.wuhn.dao;

import com.wuhn.module.User;

public interface UserMapper {
int deleteByPrimaryKey(String userid);

int insert(User record);

int insertSelective(User record);

User selectByPrimaryKey(String userid);

int updateByPrimaryKeySelective(User record);

int updateByPrimaryKey(User record);
}

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="com.wuhn.dao.UserMapper" >
<resultMap id="BaseResultMap" type="com.wuhn.module.User" >
<id column="userid" property="userid" jdbcType="VARCHAR" />
<result column="nickname" property="nickname" jdbcType="VARCHAR" />
<result column="email" property="email" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="name" property="name" jdbcType="VARCHAR" />
<result column="gender" property="gender" jdbcType="INTEGER" />
<result column="birthday" property="birthday" jdbcType="DATE" />
<result column="picture" property="picture" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List" >
userid, nickname, email, password, name, gender, birthday, picture
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String" >
select
<include refid="Base_Column_List" />
from user
where userid = #{userid,jdbcType=VARCHAR}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.String" >
delete from user
where userid = #{userid,jdbcType=VARCHAR}
</delete>
<insert id="insert" parameterType="com.wuhn.module.User" >
insert into user (userid, nickname, email,
password, name, gender,
birthday, picture)
values (#{userid,jdbcType=VARCHAR}, #{nickname,jdbcType=VARCHAR}, #{email,jdbcType=VARCHAR},
#{password,jdbcType=VARCHAR}, #{name,jdbcType=VARCHAR}, #{gender,jdbcType=INTEGER},
#{birthday,jdbcType=DATE}, #{picture,jdbcType=VARCHAR})
</insert>
<insert id="insertSelective" parameterType="com.wuhn.module.User" >
insert into user
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="userid != null" >
userid,
</if>
<if test="nickname != null" >
nickname,
</if>
<if test="email != null" >
email,
</if>
<if test="password != null" >
password,
</if>
<if test="name != null" >
name,
</if>
<if test="gender != null" >
gender,
</if>
<if test="birthday != null" >
birthday,
</if>
<if test="picture != null" >
picture,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="userid != null" >
#{userid,jdbcType=VARCHAR},
</if>
<if test="nickname != null" >
#{nickname,jdbcType=VARCHAR},
</if>
<if test="email != null" >
#{email,jdbcType=VARCHAR},
</if>
<if test="password != null" >
#{password,jdbcType=VARCHAR},
</if>
<if test="name != null" >
#{name,jdbcType=VARCHAR},
</if>
<if test="gender != null" >
#{gender,jdbcType=INTEGER},
</if>
<if test="birthday != null" >
#{birthday,jdbcType=DATE},
</if>
<if test="picture != null" >
#{picture,jdbcType=VARCHAR},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.wuhn.module.User" >
update user
<set >
<if test="nickname != null" >
nickname = #{nickname,jdbcType=VARCHAR},
</if>
<if test="email != null" >
email = #{email,jdbcType=VARCHAR},
</if>
<if test="password != null" >
password = #{password,jdbcType=VARCHAR},
</if>
<if test="name != null" >
name = #{name,jdbcType=VARCHAR},
</if>
<if test="gender != null" >
gender = #{gender,jdbcType=INTEGER},
</if>
<if test="birthday != null" >
birthday = #{birthday,jdbcType=DATE},
</if>
<if test="picture != null" >
picture = #{picture,jdbcType=VARCHAR},
</if>
</set>
where userid = #{userid,jdbcType=VARCHAR}
</update>
<update id="updateByPrimaryKey" parameterType="com.wuhn.module.User" >
update user
set nickname = #{nickname,jdbcType=VARCHAR},
email = #{email,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
name = #{name,jdbcType=VARCHAR},
gender = #{gender,jdbcType=INTEGER},
birthday = #{birthday,jdbcType=DATE},
picture = #{picture,jdbcType=VARCHAR}
where userid = #{userid,jdbcType=VARCHAR}
</update>
</mapper>

User.java

package com.wuhn.module;

import java.util.Date;

public class User {
private String userid;

private String nickname;

private String email;

private String password;

private String name;

private Integer gender;

private Date birthday;

private String picture;

public String getUserid() {
return userid;
}

public void setUserid(String userid) {
this.userid = userid == null ? null : userid.trim();
}

public String getNickname() {
return nickname;
}

public void setNickname(String nickname) {
this.nickname = nickname == null ? null : nickname.trim();
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email == null ? null : email.trim();
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}

public String getName() {
return name;
}

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

public Integer getGender() {
return gender;
}

public void setGender(Integer gender) {
this.gender = gender;
}

public Date getBirthday() {
return birthday;
}

public void setBirthday(Date birthday) {
this.birthday = birthday;
}

public String getPicture() {
return picture;
}

public void setPicture(String picture) {
this.picture = picture == null ? null : picture.trim();
}
}