由于MyBatis属于一种半自动的ORM框架,所以主要的工作将是书写Mapping映射文件,但是由于手写映射文件很容易出错,所以查资料发现有现成的工具可以自动生成底层模型类、Dao接口类甚至Mapping映射文件。
一、建立表结构
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、下载mybatis-generator-core
进入:http://code.google.com/p/mybatis/
选择Downloads,再选择MyBatis Generator Tool下载即可。
三、生成配置文件
新建一个空的XML配置文件,名称可以随便取,这里以generatorConfig.xml为名。最好将这个文件放在下载后的lib目录中,如图:
其中mysql的驱动可以随便放在非中文路径的地方,这里为了方便就放在lib目录下。
自动生成最重要的就是配置文件的书写,现在就开始介绍generatorConfig.xml这个文件的具体内容:
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<generatorConfiguration>
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<!-- 数据库驱动-->
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<classPathEntry location="mysql-connector-java-5.0.6-bin.jar"/>
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<context id="DB2Tables" targetRuntime="MyBatis3">
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<commentGenerator>
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<property name="suppressDate" value="true"/>
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<!-- 是否去除自动生成的注释 true:是 : false:否 -->
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<property name="suppressAllComments" value="true"/>
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</commentGenerator>
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<!--数据库链接URL,用户名、密码 -->
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<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost/test" userId="test" password="test">
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</jdbcConnection>
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<javaTypeResolver>
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<property name="forceBigDecimals" value="false"/>
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</javaTypeResolver>
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<!-- 生成模型的包名和位置-->
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<javaModelGenerator targetPackage="test.model" targetProject="src">
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<property name="enableSubPackages" value="true"/>
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<property name="trimStrings" value="true"/>
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</javaModelGenerator>
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<!-- 生成映射文件的包名和位置-->
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<sqlMapGenerator targetPackage="test.mapping" targetProject="src">
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<property name="enableSubPackages" value="true"/>
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</sqlMapGenerator>
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<!-- 生成DAO的包名和位置-->
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<javaClientGenerator type="XMLMAPPER" targetPackage="test.dao" targetProject="src">
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<property name="enableSubPackages" value="true"/>
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</javaClientGenerator>
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<!-- 要生成哪些表-->
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<table tableName="about" domainObjectName="AboutDto" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
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<table tableName="user" domainObjectName="UserDto" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
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<table tableName="syslogs" domainObjectName="SyslogsDto" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
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</context>
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</generatorConfiguration>
1、其中需要注意的有数据库驱动、数据库URL、用户名、密码、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对应的类名。
四、运行
需要通过CMD命令行方式来运行,首先可以先准备一个运行的脚本,这里使用的脚本是: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为下载的对应版本的jar,generatorConfig.xml 为配置文件名,如果不为这个可以在这里进行修改。
启动cmd进入到“F:\soft\mybatis-generator-core-1.3.2\lib”这个目录下,如图:
生成成功后进到src目录下,可以看到已经生成了对应的model、dao、mapping,如图:
下面可以看看生成后的UserMapper.xml
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<mapper namespace="test.dao.UserDtoMapper" >
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<resultMap id="BaseResultMap" type="test.model.UserDto" >
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<id column="id" property="id" jdbcType="VARCHAR" />
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<result column="username" property="username" jdbcType="VARCHAR" />
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<result column="password" property="password" jdbcType="VARCHAR" />
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<result column="email" property="email" jdbcType="VARCHAR" />
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<result column="name" property="name" jdbcType="VARCHAR" />
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<result column="sex" property="sex" jdbcType="VARCHAR" />
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<result column="birthday" property="birthday" jdbcType="VARCHAR" />
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<result column="address" property="address" jdbcType="VARCHAR" />
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<result column="tel" property="tel" jdbcType="VARCHAR" />
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<result column="qq" property="qq" jdbcType="VARCHAR" />
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<result column="image" property="image" jdbcType="VARCHAR" />
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<result column="sfjh" property="sfjh" jdbcType="VARCHAR" />
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<result column="sfzx" property="sfzx" jdbcType="VARCHAR" />
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<result column="sfhf" property="sfhf" jdbcType="VARCHAR" />
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<result column="sfpl" property="sfpl" jdbcType="VARCHAR" />
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<result column="sffx" property="sffx" jdbcType="VARCHAR" />
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</resultMap>
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<sql id="Base_Column_List" >
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id, username, password, email, name, sex, birthday, address, tel, qq, image, sfjh,
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sfzx, sfhf, sfpl, sffx
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</sql>
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<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String" >
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select
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<include refid="Base_Column_List" />
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from user
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where id = #{id,jdbcType=VARCHAR}
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</select>
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<delete id="deleteByPrimaryKey" parameterType="java.lang.String" >
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delete from user
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where id = #{id,jdbcType=VARCHAR}
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</delete>
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<insert id="insert" parameterType="test.model.UserDto" >
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insert into user (id, username, password,
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email, name, sex, birthday,
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address, tel, qq, image,
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sfjh, sfzx, sfhf, sfpl,
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sffx)
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values (#{id,jdbcType=VARCHAR}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
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#{email,jdbcType=VARCHAR}, #{name,jdbcType=VARCHAR}, #{sex,jdbcType=VARCHAR}, #{birthday,jdbcType=VARCHAR},
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#{address,jdbcType=VARCHAR}, #{tel,jdbcType=VARCHAR}, #{qq,jdbcType=VARCHAR}, #{image,jdbcType=VARCHAR},
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#{sfjh,jdbcType=VARCHAR}, #{sfzx,jdbcType=VARCHAR}, #{sfhf,jdbcType=VARCHAR}, #{sfpl,jdbcType=VARCHAR},
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#{sffx,jdbcType=VARCHAR})
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</insert>
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<insert id="insertSelective" parameterType="test.model.UserDto" >
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insert into user
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<trim prefix="(" suffix=")" suffixOverrides="," >
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<if test="id != null" >
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id,
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</if>
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<if test="username != null" >
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username,
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</if>
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<if test="password != null" >
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password,
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</if>
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<if test="email != null" >
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email,
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</if>
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<if test="name != null" >
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name,
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</if>
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<if test="sex != null" >
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sex,
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</if>
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<if test="birthday != null" >
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birthday,
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</if>
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<if test="address != null" >
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address,
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</if>
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<if test="tel != null" >
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tel,
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</if>
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<if test="qq != null" >
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qq,
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</if>
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<if test="image != null" >
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image,
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</if>
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<if test="sfjh != null" >
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sfjh,
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</if>
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<if test="sfzx != null" >
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sfzx,
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</if>
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<if test="sfhf != null" >
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sfhf,
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</if>
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<if test="sfpl != null" >
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sfpl,
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</if>
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<if test="sffx != null" >
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sffx,
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</if>
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</trim>
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<trim prefix="values (" suffix=")" suffixOverrides="," >
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<if test="id != null" >
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#{id,jdbcType=VARCHAR},
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</if>
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<if test="username != null" >
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#{username,jdbcType=VARCHAR},
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</if>
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<if test="password != null" >
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#{password,jdbcType=VARCHAR},
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</if>
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<if test="email != null" >
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#{email,jdbcType=VARCHAR},
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</if>
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<if test="name != null" >
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#{name,jdbcType=VARCHAR},
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</if>
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<if test="sex != null" >
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#{sex,jdbcType=VARCHAR},
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</if>
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<if test="birthday != null" >
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#{birthday,jdbcType=VARCHAR},
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</if>
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<if test="address != null" >
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#{address,jdbcType=VARCHAR},
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</if>
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<if test="tel != null" >
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#{tel,jdbcType=VARCHAR},
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</if>
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<if test="qq != null" >
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#{qq,jdbcType=VARCHAR},
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</if>
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<if test="image != null" >
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#{image,jdbcType=VARCHAR},
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</if>
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<if test="sfjh != null" >
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#{sfjh,jdbcType=VARCHAR},
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</if>
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<if test="sfzx != null" >
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#{sfzx,jdbcType=VARCHAR},
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</if>
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<if test="sfhf != null" >
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#{sfhf,jdbcType=VARCHAR},
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</if>
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<if test="sfpl != null" >
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#{sfpl,jdbcType=VARCHAR},
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</if>
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<if test="sffx != null" >
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#{sffx,jdbcType=VARCHAR},
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</if>
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</trim>
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</insert>
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<update id="updateByPrimaryKeySelective" parameterType="test.model.UserDto" >
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update user
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<set >
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<if test="username != null" >
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username = #{username,jdbcType=VARCHAR},
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</if>
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<if test="password != null" >
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password = #{password,jdbcType=VARCHAR},
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</if>
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<if test="email != null" >
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email = #{email,jdbcType=VARCHAR},
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</if>
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<if test="name != null" >
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name = #{name,jdbcType=VARCHAR},
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</if>
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<if test="sex != null" >
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sex = #{sex,jdbcType=VARCHAR},
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</if>
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<if test="birthday != null" >
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birthday = #{birthday,jdbcType=VARCHAR},
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</if>
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<if test="address != null" >
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address = #{address,jdbcType=VARCHAR},
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</if>
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<if test="tel != null" >
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tel = #{tel,jdbcType=VARCHAR},
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</if>
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<if test="qq != null" >
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qq = #{qq,jdbcType=VARCHAR},
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</if>
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<if test="image != null" >
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image = #{image,jdbcType=VARCHAR},
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</if>
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<if test="sfjh != null" >
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sfjh = #{sfjh,jdbcType=VARCHAR},
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</if>
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<if test="sfzx != null" >
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sfzx = #{sfzx,jdbcType=VARCHAR},
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</if>
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<if test="sfhf != null" >
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sfhf = #{sfhf,jdbcType=VARCHAR},
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</if>
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<if test="sfpl != null" >
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sfpl = #{sfpl,jdbcType=VARCHAR},
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</if>
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<if test="sffx != null" >
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sffx = #{sffx,jdbcType=VARCHAR},
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</if>
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</set>
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where id = #{id,jdbcType=VARCHAR}
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</update>
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<update id="updateByPrimaryKey" parameterType="test.model.UserDto" >
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update user
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set username = #{username,jdbcType=VARCHAR},
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password = #{password,jdbcType=VARCHAR},
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email = #{email,jdbcType=VARCHAR},
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name = #{name,jdbcType=VARCHAR},
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sex = #{sex,jdbcType=VARCHAR},
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birthday = #{birthday,jdbcType=VARCHAR},
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address = #{address,jdbcType=VARCHAR},
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tel = #{tel,jdbcType=VARCHAR},
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qq = #{qq,jdbcType=VARCHAR},
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image = #{image,jdbcType=VARCHAR},
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sfjh = #{sfjh,jdbcType=VARCHAR},
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sfzx = #{sfzx,jdbcType=VARCHAR},
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sfhf = #{sfhf,jdbcType=VARCHAR},
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sfpl = #{sfpl,jdbcType=VARCHAR},
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sffx = #{sffx,jdbcType=VARCHAR}
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where id = #{id,jdbcType=VARCHAR}
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</update>
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</mapper>
接下来就可以将这三个目录拷贝到对应项目的目录中,如果需要新增自己的方法可以修改dao类。