简介：Mybatis-Generator是一个数据库逆向框架代码生成工具，利用该工具可以自动生成Dao，Model，Mapping。
1. 准备工作：
step1: 下载Mybatis-Generator
step2: 数据库（本例为mysql）添加表
DROP TABLE IF EXISTS `springmvc_user`;
CREATE TABLE `springmvc_user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(11) NOT NULL,
`password` varchar(50) NOT NULL,
`age` int(11) NOT NULL,
`email` varchar(12) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
step3: 下载mysql连接驱动包（本例为mysql-connector-java-5.1.18-bin.jar）
2. 正式操作
step1：打开配置文件generator.xml，修改注释部分内容
<?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:\ZHY\app\generator\mysql-connector-java-5.1.18-bin.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/zhy" userId="root" password="">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- 生成模型的包名和位置 -->
<javaModelGenerator targetPackage="zhy.model" targetProject="E:\ZHY\app\generator\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="zhy.mapping" targetProject="E:\ZHY\app\generator\src">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<!-- 生成DAO的包名和位置 -->
<javaClientGenerator type="XMLMAPPER" targetPackage="zhy.dao" targetProject="E:\ZHY\app\generator\src">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<!-- 要生成那些表(更改tableName和domainObjectName就可以) -->
<table tableName="springmvc_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false" />
</context>
</generatorConfiguration>
step2：shift+鼠标右键 选择“在此处打开命令窗口” 输入命令：
java -jar mybatis-generator-core-1.3.2.jar -configfile generator.xml -overwrite
这样即为成功，可以看到在src目录下已经生成了对应文件。
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="zhy.dao.UserMapper" >
<resultMap id="BaseResultMap" type="zhy.model.User" >
<id column="id" property="id" jdbcType="INTEGER" />
<result column="username" property="username" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="age" property="age" jdbcType="INTEGER" />
<result column="email" property="email" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List" >
id, username, password, age, email
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from springmvc_user
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
delete from springmvc_user
where id = #{id,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="zhy.model.User" >
insert into springmvc_user (id, username, password,
age, email)
values (#{id,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
#{age,jdbcType=INTEGER}, #{email,jdbcType=VARCHAR})
</insert>
<insert id="insertSelective" parameterType="zhy.model.User" >
insert into springmvc_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="age != null" >
age,
</if>
<if test="email != null" >
email,
</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="age != null" >
#{age,jdbcType=INTEGER},
</if>
<if test="email != null" >
#{email,jdbcType=VARCHAR},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="zhy.model.User" >
update springmvc_user
<set >
<if test="username != null" >
username = #{username,jdbcType=VARCHAR},
</if>
<if test="password != null" >
password = #{password,jdbcType=VARCHAR},
</if>
<if test="age != null" >
age = #{age,jdbcType=INTEGER},
</if>
<if test="email != null" >
email = #{email,jdbcType=VARCHAR},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="zhy.model.User" >
update springmvc_user
set username = #{username,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
age = #{age,jdbcType=INTEGER},
email = #{email,jdbcType=VARCHAR}
where id = #{id,jdbcType=INTEGER}
</update>
</mapper>
User.java:
package zhy.model;
public class User {
private Integer id;
private String username;
private String password;
private Integer age;
private String email;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username == null ? null : username.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email == null ? null : email.trim();
}
}
UserMapper.java：
package zhy.dao;
import zhy.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);
}
另外，也可以在IDE中使用该工具，eclipse有相关插件，可以在eclipse里面安装，地址为：http://mybatis.googlecode.com/svn/sub-projects/generator/trunk/eclipse/UpdateSite/