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>以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
