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);
}
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