mybatis mybatis-generator 代码自动生成工具

2024-08-26 04:32

本文主要是介绍mybatis mybatis-generator 代码自动生成工具,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!

一、简介

mybatis generator是很好用的mybatis自动代码生成工具。最近公司使用maven和mybatis开发项目,手动写入一个个实体类和mapper还有xml配置文件感觉会很麻烦,使用mybatis generator只需要简单的配置就能完成我们的工作,这里简述一下开发步骤。

二、开发流程

2.1 创建maven项目

我们选择开发工具创建maven项目,我这里使用myeclipse开发,建议使用eclipse或者idea开发。 
这里写图片描述

2.2 在pom配置文件中加入依赖包

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>mybatis-generator-base</groupId><artifactId>mybatis-generator-base</artifactId><version>0.0.1-SNAPSHOT</version><packaging>war</packaging><name/><description/><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version><scope>provided</scope></dependency><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.1</version><scope>provided</scope></dependency><dependency><groupId>org.glassfish</groupId><artifactId>javax.annotation</artifactId><version>3.0.1</version></dependency><dependency><groupId>org.glassfish</groupId><artifactId>javax.ejb</artifactId><version>3.0.1</version></dependency><dependency><groupId>org.jboss.weld</groupId><artifactId>weld-osgi-bundle</artifactId><version>1.0.1-SP3</version></dependency><dependency><groupId>org.glassfish</groupId><artifactId>javax.servlet</artifactId><version>3.0.1</version></dependency><!--测试框架  --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><!-- Mysql --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.2.7</version></dependency><!-- Mysql 依赖 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.6</version></dependency><!--生成代码插件--><dependency><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.2</version><type>jar</type></dependency></dependencies><build><plugins><plugin><artifactId>maven-war-plugin</artifactId></plugin><plugin><artifactId>maven-compiler-plugin</artifactId><configuration><source>1.6</source><target>1.6</target></configuration></plugin></plugins></build>
</project>
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2.3 新建生成代码的配置文件mybatis-generator-config.xml

将配置文件配置在合适的位置就可以,但是要访问的到,我这里放置在resources文件下。

<?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><context id="prod"><!-- RowBounds pagination --><plugin type="org.mybatis.generator.plugins.RowBoundsPlugin" /><plugin type="org.mybatis.generator.plugins.CaseInsensitiveLikePlugin" /><plugin type="org.mybatis.generator.plugins.SerializablePlugin" /><commentGenerator><property name="suppressDate" value="true" /><property name="suppressAllComments" value="true" /></commentGenerator><!-- jdbc连接 --><jdbcConnection driverClass="com.mysql.jdbc.Driver"connectionURL="jdbc:mysql://127.0.0.1:3306/generator" userId="root"password="123456" /><javaModelGenerator targetPackage="com.mybatis.entity"targetProject="src/main/java"><!-- 是否针对string类型的字段在set的时候进行trim调用 --><property name="trimStrings" value="true" /></javaModelGenerator><sqlMapGenerator targetPackage="mappers" targetProject="src/main/java" /><javaClientGenerator targetPackage="com.mybatis.mapper"targetProject="src/main/java" type="XMLMAPPER" /><table tableName="wx_ranking_flow" domainObjectName="WxRankingFlow"></table></context>
</generatorConfiguration>
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(1)在javaModelGenerator标签下配置你需要生成的数据库实体的地址 
(2)在sqlMapGenerator标签下配置mysql的xml配置文件 
(3)在javaClientGenerator标签下配置mapper方法 
(4)在table标签下配置数据库的表面和生成实体的表名

2.4 新建批处理类main方法

package com.mybatis.test;import org.mybatis.generator.api.ShellRunner;public class App {public static void main(String[] args) {args = new String[] { "-configfile", "src\\main\\resources\\mybatis-generator-config.xml", "-overwrite" };ShellRunner.main(args);}}
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这里要处理的就是我们的mybatis-generator-config.xml配置文件,路径一定要对应我们的存放路径。 
执行main方法就可以生成对应的实体和xml配置文件了。 
这里写图片描述 
我们会发现我们生成了两个实体对象,一个是数据库映射对象,一个是Example对象。Example对象就是为了方便我们执行sql操作的类,可以使用Example类进行数据库的条件查询。同时mybatis-generator还帮助我们生成了sql的CRUD等操作。

WxRankingFlowMapper接口

package com.mybatis.mapper;import java.util.List;import com.mybatis.entity.WxRankingFlow;
import com.mybatis.entity.WxRankingFlowExample;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.session.RowBounds;public interface WxRankingFlowMapper {int countByExample(WxRankingFlowExample example);int deleteByExample(WxRankingFlowExample example);int deleteByPrimaryKey(String rId);int insert(WxRankingFlow record);int insertSelective(WxRankingFlow record);List<WxRankingFlow> selectByExampleWithRowbounds(WxRankingFlowExample example, RowBounds rowBounds);List<WxRankingFlow> selectByExample(WxRankingFlowExample example);WxRankingFlow selectByPrimaryKey(String rId);int updateByExampleSelective(@Param("record") WxRankingFlow record, @Param("example") WxRankingFlowExample example);int updateByExample(@Param("record") WxRankingFlow record, @Param("example") WxRankingFlowExample example);int updateByPrimaryKeySelective(WxRankingFlow record);int updateByPrimaryKey(WxRankingFlow record);
}
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WxRankingFlowMapper.xml配置文件(这个配置文件就是我们对应实体的,命名是数据库名)

<?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="com.mybatis.mapper.WxRankingFlowMapper" ><resultMap id="BaseResultMap" type="com.mybatis.entity.WxRankingFlow" ><id column="r_id" property="rId" jdbcType="VARCHAR" /><result column="r_gift_date" property="rGiftDate" jdbcType="VARCHAR" /><result column="r_sid" property="rSid" jdbcType="VARCHAR" /><result column="r_card_no" property="rCardNo" jdbcType="VARCHAR" /><result column="r_card_name" property="rCardName" jdbcType="VARCHAR" /><result column="r_re_openid" property="rReOpenid" jdbcType="VARCHAR" /><result column="r_number" property="rNumber" jdbcType="INTEGER" /><result column="r_chain_code" property="rChainCode" jdbcType="VARCHAR" /><result column="r_chain_id" property="rChainId" jdbcType="VARCHAR" /><result column="r_chain_name" property="rChainName" jdbcType="VARCHAR" /><result column="r_total_amount" property="rTotalAmount" jdbcType="INTEGER" /><result column="r_total_count" property="rTotalCount" jdbcType="INTEGER" /><result column="r_praise_count" property="rPraiseCount" jdbcType="INTEGER" /><result column="r_create_time" property="rCreateTime" jdbcType="TIMESTAMP" /><result column="r_update_time" property="rUpdateTime" jdbcType="TIMESTAMP" /></resultMap><sql id="Example_Where_Clause" ><where ><foreach collection="oredCriteria" item="criteria" separator="or" ><if test="criteria.valid" ><trim prefix="(" suffix=")" prefixOverrides="and" ><foreach collection="criteria.criteria" item="criterion" ><choose ><when test="criterion.noValue" >and ${criterion.condition}</when><when test="criterion.singleValue" >and ${criterion.condition} #{criterion.value}</when><when test="criterion.betweenValue" >and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}</when><when test="criterion.listValue" >and ${criterion.condition}<foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >#{listItem}</foreach></when></choose></foreach></trim></if></foreach></where></sql><sql id="Update_By_Example_Where_Clause" ><where ><foreach collection="example.oredCriteria" item="criteria" separator="or" ><if test="criteria.valid" ><trim prefix="(" suffix=")" prefixOverrides="and" ><foreach collection="criteria.criteria" item="criterion" ><choose ><when test="criterion.noValue" >and ${criterion.condition}</when><when test="criterion.singleValue" >and ${criterion.condition} #{criterion.value}</when><when test="criterion.betweenValue" >and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}</when><when test="criterion.listValue" >and ${criterion.condition}<foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," >#{listItem}</foreach></when></choose></foreach></trim></if></foreach></where></sql><sql id="Base_Column_List" >r_id, r_gift_date, r_sid, r_card_no, r_card_name, r_re_openid, r_number, r_chain_code, r_chain_id, r_chain_name, r_total_amount, r_total_count, r_praise_count, r_create_time, r_update_time</sql><select id="selectByExample" resultMap="BaseResultMap" parameterType="com.mybatis.entity.WxRankingFlowExample" >select<if test="distinct" >distinct</if><include refid="Base_Column_List" />from wx_ranking_flow<if test="_parameter != null" ><include refid="Example_Where_Clause" /></if><if test="orderByClause != null" >order by ${orderByClause}</if></select><select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String" >select <include refid="Base_Column_List" />from wx_ranking_flowwhere r_id = #{rId,jdbcType=VARCHAR}</select><delete id="deleteByPrimaryKey" parameterType="java.lang.String" >delete from wx_ranking_flowwhere r_id = #{rId,jdbcType=VARCHAR}</delete><delete id="deleteByExample" parameterType="com.mybatis.entity.WxRankingFlowExample" >delete from wx_ranking_flow<if test="_parameter != null" ><include refid="Example_Where_Clause" /></if></delete><insert id="insert" parameterType="com.mybatis.entity.WxRankingFlow" >insert into wx_ranking_flow (r_id, r_gift_date, r_sid, r_card_no, r_card_name, r_re_openid, r_number, r_chain_code, r_chain_id, r_chain_name, r_total_amount, r_total_count, r_praise_count, r_create_time, r_update_time)values (#{rId,jdbcType=VARCHAR}, #{rGiftDate,jdbcType=VARCHAR}, #{rSid,jdbcType=VARCHAR}, #{rCardNo,jdbcType=VARCHAR}, #{rCardName,jdbcType=VARCHAR}, #{rReOpenid,jdbcType=VARCHAR}, #{rNumber,jdbcType=INTEGER}, #{rChainCode,jdbcType=VARCHAR}, #{rChainId,jdbcType=VARCHAR}, #{rChainName,jdbcType=VARCHAR}, #{rTotalAmount,jdbcType=INTEGER}, #{rTotalCount,jdbcType=INTEGER}, #{rPraiseCount,jdbcType=INTEGER}, #{rCreateTime,jdbcType=TIMESTAMP}, #{rUpdateTime,jdbcType=TIMESTAMP})</insert><insert id="insertSelective" parameterType="com.mybatis.entity.WxRankingFlow" >insert into wx_ranking_flow<trim prefix="(" suffix=")" suffixOverrides="," ><if test="rId != null" >r_id,</if><if test="rGiftDate != null" >r_gift_date,</if><if test="rSid != null" >r_sid,</if><if test="rCardNo != null" >r_card_no,</if><if test="rCardName != null" >r_card_name,</if><if test="rReOpenid != null" >r_re_openid,</if><if test="rNumber != null" >r_number,</if><if test="rChainCode != null" >r_chain_code,</if><if test="rChainId != null" >r_chain_id,</if><if test="rChainName != null" >r_chain_name,</if><if test="rTotalAmount != null" >r_total_amount,</if><if test="rTotalCount != null" >r_total_count,</if><if test="rPraiseCount != null" >r_praise_count,</if><if test="rCreateTime != null" >r_create_time,</if><if test="rUpdateTime != null" >r_update_time,</if></trim><trim prefix="values (" suffix=")" suffixOverrides="," ><if test="rId != null" >#{rId,jdbcType=VARCHAR},</if><if test="rGiftDate != null" >#{rGiftDate,jdbcType=VARCHAR},</if><if test="rSid != null" >#{rSid,jdbcType=VARCHAR},</if><if test="rCardNo != null" >#{rCardNo,jdbcType=VARCHAR},</if><if test="rCardName != null" >#{rCardName,jdbcType=VARCHAR},</if><if test="rReOpenid != null" >#{rReOpenid,jdbcType=VARCHAR},</if><if test="rNumber != null" >#{rNumber,jdbcType=INTEGER},</if><if test="rChainCode != null" >#{rChainCode,jdbcType=VARCHAR},</if><if test="rChainId != null" >#{rChainId,jdbcType=VARCHAR},</if><if test="rChainName != null" >#{rChainName,jdbcType=VARCHAR},</if><if test="rTotalAmount != null" >#{rTotalAmount,jdbcType=INTEGER},</if><if test="rTotalCount != null" >#{rTotalCount,jdbcType=INTEGER},</if><if test="rPraiseCount != null" >#{rPraiseCount,jdbcType=INTEGER},</if><if test="rCreateTime != null" >#{rCreateTime,jdbcType=TIMESTAMP},</if><if test="rUpdateTime != null" >#{rUpdateTime,jdbcType=TIMESTAMP},</if></trim></insert><select id="countByExample" parameterType="com.mybatis.entity.WxRankingFlowExample" resultType="java.lang.Integer" >select count(*) from wx_ranking_flow<if test="_parameter != null" ><include refid="Example_Where_Clause" /></if></select><update id="updateByExampleSelective" parameterType="map" >update wx_ranking_flow<set ><if test="record.rId != null" >r_id = #{record.rId,jdbcType=VARCHAR},</if><if test="record.rGiftDate != null" >r_gift_date = #{record.rGiftDate,jdbcType=VARCHAR},</if><if test="record.rSid != null" >r_sid = #{record.rSid,jdbcType=VARCHAR},</if><if test="record.rCardNo != null" >r_card_no = #{record.rCardNo,jdbcType=VARCHAR},</if><if test="record.rCardName != null" >r_card_name = #{record.rCardName,jdbcType=VARCHAR},</if><if test="record.rReOpenid != null" >r_re_openid = #{record.rReOpenid,jdbcType=VARCHAR},</if><if test="record.rNumber != null" >r_number = #{record.rNumber,jdbcType=INTEGER},</if><if test="record.rChainCode != null" >r_chain_code = #{record.rChainCode,jdbcType=VARCHAR},</if><if test="record.rChainId != null" >r_chain_id = #{record.rChainId,jdbcType=VARCHAR},</if><if test="record.rChainName != null" >r_chain_name = #{record.rChainName,jdbcType=VARCHAR},</if><if test="record.rTotalAmount != null" >r_total_amount = #{record.rTotalAmount,jdbcType=INTEGER},</if><if test="record.rTotalCount != null" >r_total_count = #{record.rTotalCount,jdbcType=INTEGER},</if><if test="record.rPraiseCount != null" >r_praise_count = #{record.rPraiseCount,jdbcType=INTEGER},</if><if test="record.rCreateTime != null" >r_create_time = #{record.rCreateTime,jdbcType=TIMESTAMP},</if><if test="record.rUpdateTime != null" >r_update_time = #{record.rUpdateTime,jdbcType=TIMESTAMP},</if></set><if test="_parameter != null" ><include refid="Update_By_Example_Where_Clause" /></if></update><update id="updateByExample" parameterType="map" >update wx_ranking_flowset r_id = #{record.rId,jdbcType=VARCHAR},r_gift_date = #{record.rGiftDate,jdbcType=VARCHAR},r_sid = #{record.rSid,jdbcType=VARCHAR},r_card_no = #{record.rCardNo,jdbcType=VARCHAR},r_card_name = #{record.rCardName,jdbcType=VARCHAR},r_re_openid = #{record.rReOpenid,jdbcType=VARCHAR},r_number = #{record.rNumber,jdbcType=INTEGER},r_chain_code = #{record.rChainCode,jdbcType=VARCHAR},r_chain_id = #{record.rChainId,jdbcType=VARCHAR},r_chain_name = #{record.rChainName,jdbcType=VARCHAR},r_total_amount = #{record.rTotalAmount,jdbcType=INTEGER},r_total_count = #{record.rTotalCount,jdbcType=INTEGER},r_praise_count = #{record.rPraiseCount,jdbcType=INTEGER},r_create_time = #{record.rCreateTime,jdbcType=TIMESTAMP},r_update_time = #{record.rUpdateTime,jdbcType=TIMESTAMP}<if test="_parameter != null" ><include refid="Update_By_Example_Where_Clause" /></if></update><update id="updateByPrimaryKeySelective" parameterType="com.mybatis.entity.WxRankingFlow" >update wx_ranking_flow<set ><if test="rGiftDate != null" >r_gift_date = #{rGiftDate,jdbcType=VARCHAR},</if><if test="rSid != null" >r_sid = #{rSid,jdbcType=VARCHAR},</if><if test="rCardNo != null" >r_card_no = #{rCardNo,jdbcType=VARCHAR},</if><if test="rCardName != null" >r_card_name = #{rCardName,jdbcType=VARCHAR},</if><if test="rReOpenid != null" >r_re_openid = #{rReOpenid,jdbcType=VARCHAR},</if><if test="rNumber != null" >r_number = #{rNumber,jdbcType=INTEGER},</if><if test="rChainCode != null" >r_chain_code = #{rChainCode,jdbcType=VARCHAR},</if><if test="rChainId != null" >r_chain_id = #{rChainId,jdbcType=VARCHAR},</if><if test="rChainName != null" >r_chain_name = #{rChainName,jdbcType=VARCHAR},</if><if test="rTotalAmount != null" >r_total_amount = #{rTotalAmount,jdbcType=INTEGER},</if><if test="rTotalCount != null" >r_total_count = #{rTotalCount,jdbcType=INTEGER},</if><if test="rPraiseCount != null" >r_praise_count = #{rPraiseCount,jdbcType=INTEGER},</if><if test="rCreateTime != null" >r_create_time = #{rCreateTime,jdbcType=TIMESTAMP},</if><if test="rUpdateTime != null" >r_update_time = #{rUpdateTime,jdbcType=TIMESTAMP},</if></set>where r_id = #{rId,jdbcType=VARCHAR}</update><update id="updateByPrimaryKey" parameterType="com.mybatis.entity.WxRankingFlow" >update wx_ranking_flowset r_gift_date = #{rGiftDate,jdbcType=VARCHAR},r_sid = #{rSid,jdbcType=VARCHAR},r_card_no = #{rCardNo,jdbcType=VARCHAR},r_card_name = #{rCardName,jdbcType=VARCHAR},r_re_openid = #{rReOpenid,jdbcType=VARCHAR},r_number = #{rNumber,jdbcType=INTEGER},r_chain_code = #{rChainCode,jdbcType=VARCHAR},r_chain_id = #{rChainId,jdbcType=VARCHAR},r_chain_name = #{rChainName,jdbcType=VARCHAR},r_total_amount = #{rTotalAmount,jdbcType=INTEGER},r_total_count = #{rTotalCount,jdbcType=INTEGER},r_praise_count = #{rPraiseCount,jdbcType=INTEGER},r_create_time = #{rCreateTime,jdbcType=TIMESTAMP},r_update_time = #{rUpdateTime,jdbcType=TIMESTAMP}where r_id = #{rId,jdbcType=VARCHAR}</update><select resultMap="BaseResultMap" parameterType="com.mybatis.entity.WxRankingFlowExample" id="selectByExampleWithRowbounds" >select<if test="distinct" >distinct</if><include refid="Base_Column_List" />from wx_ranking_flow<if test="_parameter != null" ><include refid="Example_Where_Clause" /></if><if test="orderByClause != null" >order by ${orderByClause}</if></select>
</mapper
MAC 系统和Windows 系统注意路径问题 。Windows是:\  MAC是:/

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