您的位置:首页 > 移动开发

使用Mybatis-Generator自动生成Dao、Model、Mapping相关文件(转)

2016-11-08 14:55 555 查看
出处:http://www.cnblogs.com/lichenwei/p/4145696.html

Mybatis属于半自动ORM,在使用这个框架中,工作量最大的就是书写Mapping的映射文件,由于手动书写很容易出错,我们可以利用Mybatis-Generator来帮我们自动生成文件。

1、相关文件

关于Mybatis-Generator的下载可以到这个地址:https://github.com/mybatis/generator/releases

由于我使用的是Mysql数据库,这里需要在准备一个连接mysql数据库的驱动jar包

以下是相关文件截图:



和Hibernate逆向生成一样,这里也需要一个配置文件:

generatorConfig.xml

<?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-->
<classPathEntry    location="mysql-connector-java-5.0.8-bin.jar"/>
<context id="DB2Tables"    targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接地址账号密码-->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost/mymessages" userId="root" password="root">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!--生成Model类存放位置-->
<javaModelGenerator targetPackage="lcw.model" targetProject="src">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!--生成映射文件存放位置-->
<sqlMapGenerator targetPackage="lcw.mapping" targetProject="src">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!--生成Dao类存放位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="lcw.dao" targetProject="src">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--生成对应表及类名-->
<table tableName="message" domainObjectName="Messgae" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration>


需要修改文件配置的地方我都已经把注释标注出来了,这里的相关路径(如数据库驱动包,生成对应的相关文件位置可以自定义)不能带有中文。

上面配置文件中的:

<table tableName="message" domainObjectName="Messgae" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>


tableName和domainObjectName为必选项,分别代表数据库表名和生成的实力类名,其余的可以自定义去选择(一般情况下均为false)。

生成语句文件:

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


2、使用方法

在该目录按住Shift键,右键鼠标选择”在此处打开命令窗口”,复制粘贴生成语句的文件代码即可。

看下效果图:





生成相关代码:

Message.java

package lcw.model;

public class Messgae {
private Integer id;

private String title;

private String describe;

private String content;

public Integer getId() {
return id;
}

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

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title == null ? null : title.trim();
}

public String getDescribe() {
return describe;
}

public void setDescribe(String describe) {
this.describe = describe == null ? null : describe.trim();
}

public String getContent() {
return content;
}

public void setContent(String content) {
this.content = content == null ? null : content.trim();
}
}


MessgaeMapper.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="lcw.dao.MessgaeMapper" >
<resultMap id="BaseResultMap" type="lcw.model.Messgae" >
<id column="id" property="id" jdbcType="INTEGER" />
<result column="title" property="title" jdbcType="VARCHAR" />
<result column="describe" property="describe" jdbcType="VARCHAR" />
<result column="content" property="content" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List" >
id, title, describe, content
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from message
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
delete from message
where id = #{id,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="lcw.model.Messgae" >
insert into message (id, title, describe,
content)
values (#{id,jdbcType=INTEGER}, #{title,jdbcType=VARCHAR}, #{describe,jdbcType=VARCHAR},
#{content,jdbcType=VARCHAR})
</insert>
<insert id="insertSelective" parameterType="lcw.model.Messgae" >
insert into message
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
id,
</if>
<if test="title != null" >
title,
</if>
<if test="describe != null" >
describe,
</if>
<if test="content != null" >
content,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" >
#{id,jdbcType=INTEGER},
</if>
<if test="title != null" >
#{title,jdbcType=VARCHAR},
</if>
<if test="describe != null" >
#{describe,jdbcType=VARCHAR},
</if>
<if test="content != null" >
#{content,jdbcType=VARCHAR},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="lcw.model.Messgae" >
update message
<set >
<if test="title != null" >
title = #{title,jdbcType=VARCHAR},
</if>
<if test="describe != null" >
describe = #{describe,jdbcType=VARCHAR},
</if>
<if test="content != null" >
content = #{content,jdbcType=VARCHAR},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="lcw.model.Messgae" >
update message
set title = #{title,jdbcType=VARCHAR},
describe = #{describe,jdbcType=VARCHAR},
content = #{content,jdbcType=VARCHAR}
where id = #{id,jdbcType=INTEGER}
</update>
</mapper>


MessgaeMapper.java

package lcw.dao;

import lcw.model.Messgae;

public interface MessgaeMapper {
int deleteByPrimaryKey(Integer id);

int insert(Messgae record);

int insertSelective(Messgae record);

Messgae selectByPrimaryKey(Integer id);

int updateByPrimaryKeySelective(Messgae record);

int updateByPrimaryKey(Messgae record);
}
内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签:  Mybatis