使用MyBatis_Generator生成Dto、Dao、Mapping · SSM框架筆記

由于MyBatis屬于一種半自動的ORM框架，所以主要的工作將是書寫Mapping映射文件，但是由于手寫映射文件很容易出錯，所以查資料發現有現成的工具可以自動生成底層模型類、Dao接口類甚至Mapping映射文件。 ## 一、建立表結構 CREATE TABLE `user` ( ? `id` varchar(50) NOT NULL, ? `username` varchar(18) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL, ? `password` varchar(18) DEFAULT NULL, ? `email` varchar(50) DEFAULT NULL, ? `name` varchar(18) DEFAULT NULL, ? `sex` varchar(2) DEFAULT NULL, ? `birthday` varchar(50) DEFAULT NULL, ? `address` varchar(500) DEFAULT NULL, ? `tel` varchar(18) DEFAULT NULL, ? `qq` varchar(18) DEFAULT NULL, ? `image` varchar(50) DEFAULT NULL, ? `sfjh` varchar(1) DEFAULT NULL, ? `sfzx` varchar(1) DEFAULT NULL, ? `sfhf` varchar(1) DEFAULT NULL, ? `sfpl` varchar(1) DEFAULT NULL, ? `sffx` varchar(1) DEFAULT NULL, ? PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf-8; ## 二、下載mybatis-generator-core 進入：http://code.google.com/p/mybatis/ 選擇Downloads，再選擇[MyBatis Generator Tool](http://code.google.com/p/mybatis/downloads/list?can=3&q=Product%3DGenerator)下載即可。 ## 三、生成配置文件新建一個空的XML配置文件，名稱可以隨便取，這里以generatorConfig.xml為名。最好將這個文件放在下載后的lib目錄中，如圖： ![](https://box.kancloud.cn/2016-03-01_56d50e97b4464.jpg) 其中mysql的驅動可以隨便放在非中文路徑的地方，這里為了方便就放在lib目錄下。自動生成最重要的就是配置文件的書寫，現在就開始介紹generatorConfig.xml這個文件的具體內容： ~~~ <?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>  <classPathEntry location="mysql-connector-java-5.0.6-bin.jar"/> <context id="DB2Tables" targetRuntime="MyBatis3"> <commentGenerator> <property name="suppressDate" value="true"/>  <property name="suppressAllComments" value="true"/> </commentGenerator>  <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost/test" userId="test" password="test"> </jdbcConnection> <javaTypeResolver> <property name="forceBigDecimals" value="false"/> </javaTypeResolver>  <javaModelGenerator targetPackage="test.model" targetProject="src"> <property name="enableSubPackages" value="true"/> <property name="trimStrings" value="true"/> </javaModelGenerator>  <sqlMapGenerator targetPackage="test.mapping" targetProject="src"> <property name="enableSubPackages" value="true"/> </sqlMapGenerator>  <javaClientGenerator type="XMLMAPPER" targetPackage="test.dao" targetProject="src"> <property name="enableSubPackages" value="true"/> </javaClientGenerator>  <table tableName="about" domainObjectName="AboutDto" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table> <table tableName="user" domainObjectName="UserDto" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table> <table tableName="syslogs" domainObjectName="SyslogsDto" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table> </context> </generatorConfiguration> ~~~ 1、其中需要注意的有數據庫驅動、數據庫URL、用戶名、密碼、生成模型的包名和位置、生成映射文件的包名和位置、生成DAO的包名和位置以及最后需要生成的表名和對應的類名。 ## 四、運行需要通過CMD命令行方式來運行，首先可以先準備一個運行的腳本，這里使用的腳本是：java -jar mybatis-generator-core-1.3.2.jar -configfile generatorConfig.xml -overwrite 需要注意的是：mybatis-generator-core-1.3.2.jar為下載的對應版本的jar，generatorConfig.xml 為配置文件名，如果不為這個可以在這里進行修改。啟動cmd進入到“F:\soft\mybatis-generator-core-1.3.2\lib”這個目錄下，如圖： ![](https://box.kancloud.cn/2016-03-01_56d50e97cd09a.jpg) 生成成功后進到src目錄下，可以看到已經生成了對應的model、dao、mapping，如圖： ![](https://box.kancloud.cn/2016-03-01_56d50e97dcce9.jpg) 下面可以看看生成后的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="test.dao.UserDtoMapper" > <resultMap id="BaseResultMap" type="test.model.UserDto" > <id column="id" property="id" jdbcType="VARCHAR" /> <result column="username" property="username" jdbcType="VARCHAR" /> <result column="password" property="password" jdbcType="VARCHAR" /> <result column="email" property="email" jdbcType="VARCHAR" /> <result column="name" property="name" jdbcType="VARCHAR" /> <result column="sex" property="sex" jdbcType="VARCHAR" /> <result column="birthday" property="birthday" jdbcType="VARCHAR" /> <result column="address" property="address" jdbcType="VARCHAR" /> <result column="tel" property="tel" jdbcType="VARCHAR" /> <result column="qq" property="qq" jdbcType="VARCHAR" /> <result column="image" property="image" jdbcType="VARCHAR" /> <result column="sfjh" property="sfjh" jdbcType="VARCHAR" /> <result column="sfzx" property="sfzx" jdbcType="VARCHAR" /> <result column="sfhf" property="sfhf" jdbcType="VARCHAR" /> <result column="sfpl" property="sfpl" jdbcType="VARCHAR" /> <result column="sffx" property="sffx" jdbcType="VARCHAR" /> </resultMap> <sql id="Base_Column_List" > id, username, password, email, name, sex, birthday, address, tel, qq, image, sfjh, sfzx, sfhf, sfpl, sffx </sql> <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String" > select <include refid="Base_Column_List" /> from user where id = #{id,jdbcType=VARCHAR} </select> <delete id="deleteByPrimaryKey" parameterType="java.lang.String" > delete from user where id = #{id,jdbcType=VARCHAR} </delete> <insert id="insert" parameterType="test.model.UserDto" > insert into user (id, username, password, email, name, sex, birthday, address, tel, qq, image, sfjh, sfzx, sfhf, sfpl, sffx) values (#{id,jdbcType=VARCHAR}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, #{email,jdbcType=VARCHAR}, #{name,jdbcType=VARCHAR}, #{sex,jdbcType=VARCHAR}, #{birthday,jdbcType=VARCHAR}, #{address,jdbcType=VARCHAR}, #{tel,jdbcType=VARCHAR}, #{qq,jdbcType=VARCHAR}, #{image,jdbcType=VARCHAR}, #{sfjh,jdbcType=VARCHAR}, #{sfzx,jdbcType=VARCHAR}, #{sfhf,jdbcType=VARCHAR}, #{sfpl,jdbcType=VARCHAR}, #{sffx,jdbcType=VARCHAR}) </insert> <insert id="insertSelective" parameterType="test.model.UserDto" > insert into 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="email != null" > email, </if> <if test="name != null" > name, </if> <if test="sex != null" > sex, </if> <if test="birthday != null" > birthday, </if> <if test="address != null" > address, </if> <if test="tel != null" > tel, </if> <if test="qq != null" > qq, </if> <if test="image != null" > image, </if> <if test="sfjh != null" > sfjh, </if> <if test="sfzx != null" > sfzx, </if> <if test="sfhf != null" > sfhf, </if> <if test="sfpl != null" > sfpl, </if> <if test="sffx != null" > sffx, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides="," > <if test="id != null" > #{id,jdbcType=VARCHAR}, </if> <if test="username != null" > #{username,jdbcType=VARCHAR}, </if> <if test="password != null" > #{password,jdbcType=VARCHAR}, </if> <if test="email != null" > #{email,jdbcType=VARCHAR}, </if> <if test="name != null" > #{name,jdbcType=VARCHAR}, </if> <if test="sex != null" > #{sex,jdbcType=VARCHAR}, </if> <if test="birthday != null" > #{birthday,jdbcType=VARCHAR}, </if> <if test="address != null" > #{address,jdbcType=VARCHAR}, </if> <if test="tel != null" > #{tel,jdbcType=VARCHAR}, </if> <if test="qq != null" > #{qq,jdbcType=VARCHAR}, </if> <if test="image != null" > #{image,jdbcType=VARCHAR}, </if> <if test="sfjh != null" > #{sfjh,jdbcType=VARCHAR}, </if> <if test="sfzx != null" > #{sfzx,jdbcType=VARCHAR}, </if> <if test="sfhf != null" > #{sfhf,jdbcType=VARCHAR}, </if> <if test="sfpl != null" > #{sfpl,jdbcType=VARCHAR}, </if> <if test="sffx != null" > #{sffx,jdbcType=VARCHAR}, </if> </trim> </insert> <update id="updateByPrimaryKeySelective" parameterType="test.model.UserDto" > update user <set > <if test="username != null" > username = #{username,jdbcType=VARCHAR}, </if> <if test="password != null" > password = #{password,jdbcType=VARCHAR}, </if> <if test="email != null" > email = #{email,jdbcType=VARCHAR}, </if> <if test="name != null" > name = #{name,jdbcType=VARCHAR}, </if> <if test="sex != null" > sex = #{sex,jdbcType=VARCHAR}, </if> <if test="birthday != null" > birthday = #{birthday,jdbcType=VARCHAR}, </if> <if test="address != null" > address = #{address,jdbcType=VARCHAR}, </if> <if test="tel != null" > tel = #{tel,jdbcType=VARCHAR}, </if> <if test="qq != null" > qq = #{qq,jdbcType=VARCHAR}, </if> <if test="image != null" > image = #{image,jdbcType=VARCHAR}, </if> <if test="sfjh != null" > sfjh = #{sfjh,jdbcType=VARCHAR}, </if> <if test="sfzx != null" > sfzx = #{sfzx,jdbcType=VARCHAR}, </if> <if test="sfhf != null" > sfhf = #{sfhf,jdbcType=VARCHAR}, </if> <if test="sfpl != null" > sfpl = #{sfpl,jdbcType=VARCHAR}, </if> <if test="sffx != null" > sffx = #{sffx,jdbcType=VARCHAR}, </if> </set> where id = #{id,jdbcType=VARCHAR} </update> <update id="updateByPrimaryKey" parameterType="test.model.UserDto" > update user set username = #{username,jdbcType=VARCHAR}, password = #{password,jdbcType=VARCHAR}, email = #{email,jdbcType=VARCHAR}, name = #{name,jdbcType=VARCHAR}, sex = #{sex,jdbcType=VARCHAR}, birthday = #{birthday,jdbcType=VARCHAR}, address = #{address,jdbcType=VARCHAR}, tel = #{tel,jdbcType=VARCHAR}, qq = #{qq,jdbcType=VARCHAR}, image = #{image,jdbcType=VARCHAR}, sfjh = #{sfjh,jdbcType=VARCHAR}, sfzx = #{sfzx,jdbcType=VARCHAR}, sfhf = #{sfhf,jdbcType=VARCHAR}, sfpl = #{sfpl,jdbcType=VARCHAR}, sffx = #{sffx,jdbcType=VARCHAR} where id = #{id,jdbcType=VARCHAR} </update> </mapper> ~~~ 接下來就可以將這三個目錄拷貝到對應項目的目錄中，如果需要新增自己的方法可以修改dao類。