真赞！IDEA中这么玩MyBatis，让编码速度飞起！

左手的ㄟ右手 2022-09-04 14:51 19阅读 0赞

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作者：Orson

来源：cnblogs.com/java-class/p/6237564.html

IDEA 逆向 MyBatis 工程时，不像支持 Hibernate 那样有自带插件，需要集成第三方的 MyBatis Generator。

> MyBatis Generator的详细介绍 http://mybatis.github.io/generator/index.html

本篇博客图解 MyBatis Generator 的使用过程，并结合实战说明逆向工程的使用方式。

**搭建 MyBatis Generator 插件环境**

a. 添加插件依赖 pom.xml

<plugin>
         <groupId>org.mybatis.generator</groupId>
         <artifactId>mybatis-generator-maven-plugin</artifactId>
         <version>1.3.2</version>
         <configuration>
            <configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
            <verbose>true</verbose>
            <overwrite>true</overwrite>
         </configuration>
         <executions>
            <execution>
               <id>Generate MyBatis Artifacts</id>
            </execution>
         </executions>
         <dependencies>
            <dependency>
              <groupId>org.mybatis.generator</groupId>
              <artifactId>mybatis-generator-core</artifactId>
              <version>1.3.2</version>
            </dependency>
         </dependencies>
    </plugin>

b.配置文件 generatorConfig.xml

<?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>
        <properties resource="jdbc.properties"/>
        <classPathEntry location="${jdbc_driverLocation}"/>
      
    
    
        <context id="default" targetRuntime="MyBatis3">
            
            <commentGenerator>
                <property name="suppressDate" value="true"/>
                <property name="suppressAllComments" value="true"/>
            </commentGenerator>
    
    
            
            <jdbcConnection
                    driverClass="${jdbc_driverClass}"
                    connectionURL="${jdbc_url}"
                    userId="${jdbc_user}"
                    password="${jdbc_pwd}">
            </jdbcConnection>
    
    
            
            <javaTypeResolver><property name="forceBigDecimals" value="false"/></javaTypeResolver>
    
    
            
            <javaModelGenerator targetPackage="com.rambo.sdm.dao.pojo" targetProject="src/main/java">
                
                <property name="enableSubPackages" value="false"/>
                
                <property name="constructorBased" value="true"/>
                
                <property name="trimStrings" value="true"/>
                
                <property name="immutable" value="false"/>
            </javaModelGenerator>
    
    
            
            <sqlMapGenerator targetPackage="com.rambo.sdm.dao.mapper" targetProject="src/main/java">
                <property name="enableSubPackages" value="false"/>
            </sqlMapGenerator>
    
    
            
            <javaClientGenerator targetPackage="com.rambo.sdm.dao.inter" targetProject="src/main/java" type="XMLMAPPER">
                <property name="enableSubPackages" value="true"/>
            </javaClientGenerator>
    
    
            <table tableName="user" domainObjectName="UserPO">
                <generatedKey column="uuid" sqlStatement="SELECT REPLACE(UUID(),'-','') UUID FROM DUAL"/>
            </table>
        </context>
    </generatorConfiguration>

c.数据库配置文件 jdbc.properties

jdbc_driverLocation=D:\\Program Files\\Repository\\mysql\\mysql-connector-java\\5.1.38\\mysql-connector-java-5.1.38.jar
    jdbc_driverClass=com.mysql.jdbc.Driver
    jdbc_url=jdbc:mysql://localhost:3306/db_test?useUnicode=true&characterEncoding=utf-8
    jdbc_user=root
    jdbc_pwd=123456
    validationQuery = select 1

d. 配置插件启动项

![dcd3046a6f396fe35b81dfa4bfd915c9.png][]

**项目实战**

User类就是普通的实体类，定义了数据库对应的字段，以及set/get方法。

Mybatis 引入了 Example 类，用来封装数据库查询条件。

a.比如在一个项目 我们要删除某个小组下某个用户的信息

public int deleteUserApplyInfo(long user_id,long team_id){
            StudyTeamUserApplyInfoExample ue = new StudyTeamUserApplyInfoExample();
            ue.createCriteria().andUserIdEqualTo(new BigDecimal(user_id)).andTeamIdEqualTo(new BigDecimal(team_id));
    return studyTeamUserApplyInfoDAO.deleteByExample(ue);
    }

b.根据小组ID（非主键 更新小组信息）

public int updateStudyTeamInfo(StudyTeamInfo st){
            StudyTeamInfoExample ste = new StudyTeamInfoExample();
            ste.createCriteria().andTeamIdEqualTo(st.getTeamId());
    return studyTeamInfoDAO.updateByExampleSelective(st,ste);
    }

c.其它

（1）模糊查询并且排序

public List<StudyTeamInfo> getStudyTeamInfoByName(String team_name){
            StudyTeamInfoExample se = new StudyTeamInfoExample();
            se.createCriteria().andTeamNameLike("%"+team_name+"%").andEnableEqualTo((short)1);
            se.setOrderByClause("team_score desc");
            List<StudyTeamInfo> ls = studyTeamInfoDAO.selectByExample(se);
    if(ls!=null&&ls.size()>0){
    return ls;
            }
    return null;
        }

（2）大于等于某个分数 并且小于某个分数的查询

public StudyTeamLevel getStudyTeamLevel(long score){
            StudyTeamLevelExample le = new StudyTeamLevelExample();
            le.createCriteria().andNeedScoreLessThanOrEqualTo(score).andUpScoreGreaterThan(score);
            List<StudyTeamLevel> ls = studyTeamLevelDAO.selectByExample(le);
    if(ls!=null&&ls.size()>0){
    return ls.get(0);
            }
    return null;
    }

<END>

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