MybatisPlus如何自动生成映射文件

MybatisPlus如何自动生成映射文件

目录如何自动生成映射文件一、pom.xml二、MybatisPlusUtil工具类自动映射autoMappingBehavior与mapUnderscoreToCamelCaseautoMappingBehaviormapUnderscoreToCamelCase

如何自动生成映射文件

一、pom.xml

pom.xml添加以下依赖：

org.mybatis.spring.boot

mybatis-spring-boot-starter

2.0.1

com.baomidou

mybatis-plus-boot-starter

3.0.3

com.baomidou

3.0.3

org.mybatis

mybatis-spring

1.3.2

org.freemarker

freemarker

2.3.23

com.baomidou

mybatis-plus-generator

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;

/**

* @description: 数据库生成JAVA类

* @create: 2020-07-20 14:00:00

* @update: 2020-07-20 14:00:00

*/

public class MybatisPlusUtils {

/**

* mysql自动代码生成类

*

* @param includeTables

* @param excludeTables

*/

public static void generateMysql(String[] includeTables, String[] excludeTables, Boolean db1) {

AutoGenerator autoGenerator = new AutoGenerator();

/**

* 数据库配置

*/

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);

/**

* 全局配置

*/

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);

/**

* 包名配置

*/

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);

http:// // 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();

}

/**

* oracle自动代码生成类

* @param includeTables

* @param excludeTables

*/

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);

/**

* 全局配置

*/

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);

/**

* 包名配置

*/

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

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：

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