MybatisPlus怎么自动生成映射文件

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如何自动生成映射文件

一、pom.xml

pom.xml添加以下依赖：

<dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>            <version>2.0.1</version>        </dependency><dependency>            <groupId>com.baomidou</groupId>            <artifactId>mybatis-plus-boot-starter</artifactId>            <version>3.0.3</version>        </dependency>        <dependency>            <groupId>com.baomidou</groupId>            <artifactId>mybatis-plus</artifactId>            <version>3.0.3</version>        </dependency>        <dependency>            <groupId>org.mybatis</groupId>            <artifactId>mybatis-spring</artifactId>            <version>1.3.2</version>        </dependency>        <dependency>            <groupId>org.freemarker</groupId>            <artifactId>freemarker</artifactId>            <version>2.3.23</version>        </dependency>        <!-- 高版本mybatis plus将这个包摘出来了，所以需要添加此依赖，低版本不需要 -->        <dependency>            <groupId>com.baomidou</groupId>            <artifactId>mybatis-plus-generator</artifactId>        </dependency>

二、MybatisPlusUtil工具类

package com.yss.datamiddle.common;import com.baomidou.mybatisplus.annotation.DbType;import com.baomidou.mybatisplus.annotation.IdType;import com.baomidou.mybatisplus.generator.AutoGenerator;import com.baomidou.mybatisplus.generator.config.*;import com.baomidou.mybatisplus.generator.config.querys.DB2Query;import com.baomidou.mybatisplus.generator.config.rules.DateType;import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;import java.sql.*;import java.util.ArrayList;import java.util.List;public class MybatisPlusUtils {        public static void generateMysql(String[] includeTables, String[] excludeTables, Boolean db1) {        AutoGenerator autoGenerator = new AutoGenerator();                buildmysqlDb(autoGenerator);        StrategyConfig strategyConfig = new StrategyConfig();        // 驼峰命名        strategyConfig.setColumnNaming(NamingStrategy.underline_to_camel);        strategyConfig.setNaming(NamingStrategy.underline_to_camel);        strategyConfig.setInclude(includeTables);        strategyConfig.setExclude(excludeTables);        strategyConfig.setTablePrefix("");        autoGenerator.setStrategy(strategyConfig);                GlobalConfig globalConfig = new GlobalConfig();        globalConfig.setAuthor("Han LiDong");        globalConfig.setDateType(DateType.ONLY_DATE);        globalConfig.setActiveRecord(true);        globalConfig.setIdType(IdType.INPUT);        globalConfig.setOutputDir("C:/D/ORM");  //文件生成路径        globalConfig.setMapperName("%sMapper");        globalConfig.setServiceName("%sService");        globalConfig.setServiceImplName("%sServiceImpl");        globalConfig.setXmlName("%sMapper");        globalConfig.setswagger2(true);        globalConfig.setFileOverride(true);        globalConfig.setBaseColumnList(false);        globalConfig.setBaseResultMap(false);        globalConfig.setEnableCache(false);        autoGenerator.setGlobalConfig(globalConfig);                PackageConfig packageConfig = new PackageConfig();        packageConfig.setParent("");        packageConfig.setEntity("com.yss.datamiddle.entity");        packageConfig.setMapper("com.yss.datamiddle.dao");        packageConfig.setXml("mapper");        packageConfig.setService("com.yss.datamiddle.service");        packageConfig.setServiceImpl("com.yss.datamiddle.impl");        packageConfig.setController("com.yss.datamiddle.controller");        autoGenerator.setPackageInfo(packageConfig);        // 采用默认模板,自定义模板参考@see com.baomidou.mybatisplus.generator.config.TemplateConfig//        TemplateConfig templateConfig = new TemplateConfig();        autoGenerator.setTemplateEngine(new FreemarkerTemplateEngine());        autoGenerator.execute();    }        public static void generateoracle(String[] includeTables, String[] excludeTables, Boolean db1) {        AutoGenerator autoGenerator = new AutoGenerator();        buildOracleDb(autoGenerator);        StrategyConfig strategyConfig = new StrategyConfig();        // 驼峰命名        strategyConfig.setColumnNaming(NamingStrategy.underline_to_camel);        strategyConfig.setNaming(NamingStrategy.underline_to_camel);        strategyConfig.setInclude(includeTables);        strategyConfig.setExclude(excludeTables);        strategyConfig.setTablePrefix("");        autoGenerator.setStrategy(strategyConfig);                GlobalConfig globalConfig = new GlobalConfig();        globalConfig.setAuthor("Han LiDong");        globalConfig.setDateType(DateType.ONLY_DATE);        globalConfig.setActiveRecord(true);        globalConfig.setIdType(IdType.AUTO);    //这里用oracle的序列和触发器实现主键自增        globalConfig.setOutputDir("C:/ORM");  //文件生成路径        globalConfig.setMapperName("%sMapper");        globalConfig.setServiceName("%sService");        globalConfig.setServiceImplName("%sServiceImpl");        globalConfig.setXmlName("%sMapper");        globalConfig.setSwagger2(true);        globalConfig.setFileOverride(true);        globalConfig.setBaseColumnList(false);        globalConfig.setBaseResultMap(false);        globalConfig.setEnableCache(false);        autoGenerator.setGlobalConfig(globalConfig);                PackageConfig packageConfig = new PackageConfig();        packageConfig.setParent("");        packageConfig.setEntity("com.yss.datamiddle.entity");        packageConfig.setMapper("com.yss.datamiddle.dao");        packageConfig.setXml("mapper");        packageConfig.setService("com.yss.datamiddle.service");        packageConfig.setServiceImpl("com.yss.datamiddle.impl");        packageConfig.setController("com.yss.datamiddle.controller");        autoGenerator.setPackageInfo(packageConfig);        // 采用默认模板,自定义模板参考@see com.baomidou.mybatisplus.generator.config.TemplateConfig//        TemplateConfig templateConfig = new TemplateConfig();        autoGenerator.setTemplateEngine(new FreemarkerTemplateEngine());        autoGenerator.execute();    }    private static void buildOracleDb(AutoGenerator autoGenerator) {        DataSourceConfig dataSourceConfig = new DataSourceConfig();        dataSourceConfig.setDbQuery(new MyDbQuery());   //自定义dbquery不然querydb.dbtype找不到        dataSourceConfig.setDbType(DbType.ORACLE);        dataSourceConfig.setDriverName("oracle.jdbc.driver.OracleDriver");        dataSourceConfig.setUsername("xxxxx");        dataSourceConfig.setPassword("xxxxx");        dataSourceConfig.setUrl("jdbc:oracle:thin:@192.168.xxx.xxx/orcl");        //dataSourceConfig.setUrl("jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false");        autoGenerator.setDataSource(dataSourceConfig);    }    private static void buildMysqlDb(AutoGenerator autoGenerator) {        DataSourceConfig dataSourceConfig = new DataSourceConfig();        dataSourceConfig.setDbType(DbType.MYSQL);        dataSourceConfig.setDriverName("com.mysql.jdbc.Driver");        dataSourceConfig.setUsername("root");        dataSourceConfig.setPassword("123456");        dataSourceConfig.setUrl("jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false");        autoGenerator.setDataSource(dataSourceConfig);    }    public static void main(String[] args) {        //String[] includeTables = {"hr_kpi_dept_person","sys_user"};        String[] includeTables = {"ETL_MIDDLE_STATE"};        //generateMysql(includeTables,null,false);  //mysql映射文件生成        generateOracle(includeTables,null,false);      //oracle映射文件生成    }}

右键 Run 运行之后就会生成一堆映射文件，将之copy到自己的项目中就可以了

注意: 生成的dao层文件需要自己添加@Mapper注解

自动映射autoMappingBehavior与mapUnderscoreToCamelCase

autoMappingBehavior

在Mybatis的配置文件中添加settings属性的autoMappingBehavior

<settings> <setting name="autoMappingBehavior" value="NONE"/> </settings>

autoMappingBehavior有三个属性(默认是PARTIAL)

• NONE：取消自动映射

• PARTIAL：只会自动映射，没有定义嵌套结果集映射的结果集

• FULL：会自动映射任意复杂的结果集（无论是否嵌套)

自动映射的时候sql语句的结果集字段是不区分大小写的，所以映射的pojo成员变量也不需要区分大小写，都可以映射到。

mapUnderscoreToCamelCase

如果数据库符合命名规范，即每个单词之间用下划线连接，pojo类符合驼峰式命名，就可以设置mapUnderscoreToCamelCase为true，这样就可以自动映射。

不用再给select语句的结果集字段起别名来对应pojo类的成员

一个配置完整的 settings 元素的示例如下：

<settings>  <setting name="cacheEnabled" value="true"/>  <setting name="lazyLoadingEnabled" value="true"/>  <setting name="multipleResultSetsEnabled" value="true"/>  <setting name="useColumnLabel" value="true"/>  <setting name="useGeneratedKeys" value="false"/>  <setting name="autoMappingBehavior" value="PARTIAL"/>  <setting name="autoMappingUnknownColumnBehavior" value="WARNING"/>  <setting name="defaultExecutorType" value="SIMPLE"/>  <setting name="defaultStatementTimeout" value="25"/>  <setting name="defaultFetchSize" value="100"/>  <setting name="safeRowBoundsEnabled" value="false"/>  <setting name="mapUnderscoreToCamelCase" value="false"/>  <setting name="localCacheScope" value="SESSION"/>  <setting name="jdbcTypeForNull" value="OTHER"/>  <setting name="lazyLoadTriggerMethods" value="equals,clone,hashCode,toString"/></settings>

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