Mybatis-Generator自动生成Dao、Model、Mapping文件

来源:互联网 发布:巨邦网络 编辑:程序博客网 时间:2024/06/03 21:22

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,这里需要再准备一个连接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

复制代码
 1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE generatorConfiguration 3   PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" 4   "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> 5 <generatorConfiguration> 6     <!--数据库驱动--> 7     <classPathEntry    location="mysql-connector-java-5.0.8-bin.jar"/> 8     <context id="DB2Tables"    targetRuntime="MyBatis3"> 9         <commentGenerator>10             <property name="suppressDate" value="true"/>11             <property name="suppressAllComments" value="true"/>12         </commentGenerator>13         <!--数据库链接地址账号密码-->14         <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost/mymessages" userId="root" password="root">15         </jdbcConnection>16         <javaTypeResolver>17             <property name="forceBigDecimals" value="false"/>18         </javaTypeResolver>19         <!--生成Model类存放位置-->20         <javaModelGenerator targetPackage="lcw.model" targetProject="src">21             <property name="enableSubPackages" value="true"/>22             <property name="trimStrings" value="true"/>23         </javaModelGenerator>24         <!--生成映射文件存放位置-->25         <sqlMapGenerator targetPackage="lcw.mapping" targetProject="src">26             <property name="enableSubPackages" value="true"/>27         </sqlMapGenerator>28         <!--生成Dao类存放位置-->29         <javaClientGenerator type="XMLMAPPER" targetPackage="lcw.dao" targetProject="src">30             <property name="enableSubPackages" value="true"/>31         </javaClientGenerator>32         <!--生成对应表及类名-->33         <table tableName="message" domainObjectName="Messgae" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>34     </context>35 </generatorConfiguration>
复制代码

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体类名,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:

首先这个是我的数据库表

 

 

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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