Mybatis 使用mybatis_Generator 生成PO类、mapper.java 类、Mappering.xml映射文件

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mybaits是一个半ORM框架，所以主要工作是书写Mapping的映射文件，但由于手写映射文件容易出错，因而采用能自动生成模型类（po类）、Dao接口（mapper.java接口）、Mapper.xml映射文件

一、建立表结构：

CREATE TABLE `student` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(33) DEFAULT NULL,
`sex` char(1) DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `student_index1` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

二、使用的jar包

mybatis-3.2.3.jar
mybatis-generator-core-1.3.2-javadoc.jar
mybatis-generator-core-1.3.2-sources.jar
mybatis-generator-core-1.3.2.jar
mysql-connector-java-5.1.28-bin.jar
ojdbc14.jar

三、配置generatorConfig.xml文件（其中注意：数据库连接参数、Po类的存放位置、Mapper映射文件和mapper接口的存放位置、配置的表明）

四、编写生成po类、mapper.java 类和mapper.xml映射文件类的java代码

package generatorSqlMap;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

public class GeneratorSqlMap {
public void generator() throws Exception{
List<String> warnings=new ArrayList<String>();
boolean overwriter=true;
//指定逆向工程配置文件
File configFile=new File("generatorConfig.xml");
ConfigurationParser config=new ConfigurationParser(warnings);
Configuration configuration=config.parseConfiguration(configFile);
DefaultShellCallback callback=new DefaultShellCallback(overwriter);
MyBatisGenerator myBatisGenerator=new MyBatisGenerator(configuration, callback, warnings);
myBatisGenerator.generate(null);
}

public static void main(String args[]) throws Exception{
GeneratorSqlMap generatorSqlMap=new GeneratorSqlMap();
generatorSqlMap.generator();
}
}

运行结果

生成的po类

package cn.xing.ssm.domain;
public class Student {
private Integer id;
private String name;
private String sex;
  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;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}

生成的mapper.java文件

package cn.xing.ssm.dao.mapper;
import cn.xing.ssm.domain.Student;
import cn.xing.ssm.domain.StudentExample;
import java.util.List;
import org.apache.ibatis.annotations.Param;

public interface StudentMapper {
int countByExample(StudentExample example);
int deleteByExample(StudentExample example);
      int deleteByPrimaryKey(Integer id);
  int insert(Student record);
int insertSelective(Student record);
List<Student> selectByExample(StudentExample example);
   Student selectByPrimaryKey(Integer id);
  int updateByExampleSelective(@Param("record") Student record, @Param("example") StudentExample example);
  int updateByExample(@Param("record") Student record, @Param("example") StudentExample example);
int updateByPrimaryKeySelective(Student record);
int updateByPrimaryKey(Student record);
}

生成的mapper.xml文件

<?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="cn.xing.ssm.dao.mapper.StudentMapper" >
<resultMap id="BaseResultMap" type="cn.xing.ssm.domain.Student" >
<id column="id" property="id" jdbcType="INTEGER" />
<result column="name" property="name" jdbcType="VARCHAR" />
<result column="sex" property="sex" jdbcType="CHAR" />
</resultMap>
<sql id="Example_Where_Clause" >
<where >
<foreach collection="oredCriteria" item="criteria" separator="or" >
<if test="criteria.valid" >
<trim prefix="(" suffix=")" prefixOverrides="and" >
<foreach collection="criteria.criteria" item="criterion" >
<choose >
<when test="criterion.noValue" >
and ${criterion.condition}
</when>
<when test="criterion.singleValue" >
and ${criterion.condition} #{criterion.value}
</when>
<when test="criterion.betweenValue" >
and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
</when>
<when test="criterion.listValue" >
and ${criterion.condition}
<foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
#{listItem}
</foreach>
</when>
</choose>
</foreach>
</trim>
</if>
</foreach>
</where>
</sql>
<sql id="Update_By_Example_Where_Clause" >
<where >
<foreach collection="example.oredCriteria" item="criteria" separator="or" >
<if test="criteria.valid" >
<trim prefix="(" suffix=")" prefixOverrides="and" >
<foreach collection="criteria.criteria" item="criterion" >
<choose >
<when test="criterion.noValue" >
and ${criterion.condition}
</when>
<when test="criterion.singleValue" >
and ${criterion.condition} #{criterion.value}
</when>
<when test="criterion.betweenValue" >
and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
</when>
<when test="criterion.listValue" >
and ${criterion.condition}
<foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >
#{listItem}
</foreach>
</when>
</choose>
</foreach>
</trim>
</if>
</foreach>
</where>
</sql>
<sql id="Base_Column_List" >
id, name, sex
</sql>
<select id="selectByExample" resultMap="BaseResultMap" parameterType="cn.xing.ssm.domain.StudentExample" >
select
<if test="distinct" >
distinct
</if>
<include refid="Base_Column_List" />
from student
<if test="_parameter != null" >
<include refid="Example_Where_Clause" />
</if>
<if test="orderByClause != null" >
order by ${orderByClause}
</if>
</select>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from student
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
delete from student
where id = #{id,jdbcType=INTEGER}
</delete>
<delete id="deleteByExample" parameterType="cn.xing.ssm.domain.StudentExample" >
delete from student
<if test="_parameter != null" >
<include refid="Example_Where_Clause" />
</if>
</delete>
<insert id="insert" parameterType="cn.xing.ssm.domain.Student" >
insert into student (id, name, sex)
values (#{id,jdbcType=INTEGER}, #{name,jdbcType=VARCHAR}, #{sex,jdbcType=CHAR})
</insert>
<insert id="insertSelective" parameterType="cn.xing.ssm.domain.Student" >
insert into student
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
id,
</if>
<if test="name != null" >
name,
</if>
<if test="sex != null" >
sex,
</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=CHAR},
</if>
</trim>
</insert>
<select id="countByExample" parameterType="cn.xing.ssm.domain.StudentExample" resultType="java.lang.Integer" >
select count(*) from student
<if test="_parameter != null" >
<include refid="Example_Where_Clause" />
</if>
</select>
<update id="updateByExampleSelective" parameterType="map" >
update student
<set >
<if test="record.id != null" >
id = #{record.id,jdbcType=INTEGER},
</if>
<if test="record.name != null" >
name = #{record.name,jdbcType=VARCHAR},
</if>
<if test="record.sex != null" >
sex = #{record.sex,jdbcType=CHAR},
</if>
</set>
<if test="_parameter != null" >
<include refid="Update_By_Example_Where_Clause" />
</if>
</update>
<update id="updateByExample" parameterType="map" >
update student
set id = #{record.id,jdbcType=INTEGER},
name = #{record.name,jdbcType=VARCHAR},
sex = #{record.sex,jdbcType=CHAR}
<if test="_parameter != null" >
<include refid="Update_By_Example_Where_Clause" />
</if>
</update>
<update id="updateByPrimaryKeySelective" parameterType="cn.xing.ssm.domain.Student" >
update student
<set >
<if test="name != null" >
name = #{name,jdbcType=VARCHAR},
</if>
<if test="sex != null" >
sex = #{sex,jdbcType=CHAR},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="cn.xing.ssm.domain.Student" >
update student
set name = #{name,jdbcType=VARCHAR},
sex = #{sex,jdbcType=CHAR}
where id = #{id,jdbcType=INTEGER}
</update>
</mapper>

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Mybatis 使用mybatis_Generator 生成PO类 、mapper.java 类、Mappering.xml映射文件

Mybatis 使用mybatis_Generator 生成PO类、mapper.java 类、Mappering.xml映射文件