转载自 使用Mybatis-Generator自动生成Dao、Model、Mapping相关文件
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
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfigurationPUBLIC "-//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 messagewhere id = #{id,jdbcType=INTEGER}</select><delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >delete from messagewhere 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 messageset 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);
}