Mybatis plus 使用
-
改pom
<dependencies> <!--mybatis-plus--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency> <!--mybatis-plus 代码生成器--> <dependency> <groupId>org.apache.velocity</groupId> <artifactId>velocity-engine-core</artifactId> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-generator</artifactId> <scope>test</scope> </dependency> </dependencies> <!-- 项目打包时会将java目录中的*.xml文件也进行打包 --> <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> </resources> </build> -
写yml
mybatis-plus: mapper-locations: classpath:com/zjazn/smallarea/mapper/xml/*.xml -
主启动类，类上追加注解
@MapperScan("com.zjazn.smallarea.mapper") -
结构生成器，即entity、mapper、service 、controller
可以直接运行，需要修改数据库连接信息与要生成结构对应的表（查看注释进行修改）
import com.baomidou.mybatisplus.annotation.DbType; import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.generator.AutoGenerator; import com.baomidou.mybatisplus.generator.config.DataSourceConfig; import com.baomidou.mybatisplus.generator.config.GlobalConfig; import com.baomidou.mybatisplus.generator.config.PackageConfig; import com.baomidou.mybatisplus.generator.config.StrategyConfig; import com.baomidou.mybatisplus.generator.config.rules.DateType; import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy; import org.junit.Test; /** * @author * @since 2018/12/13 */ public class CodeGenerator { @Test public void run() { // 1、创建代码生成器 AutoGenerator mpg = new AutoGenerator(); // 2、全局配置 GlobalConfig gc = new GlobalConfig(); String projectPath = System.getProperty("user.dir"); //代码生成的绝对路径！！ gc.setOutputDir("/home/nor/code/i/SmallArea/distributed-smallarea-service/product-service/src/main/java/"); gc.setAuthor("testjava"); gc.setOpen(false); //生成后是否打开资源管理器 gc.setFileOverride(false); //重新生成时文件是否覆盖 //UserServie gc.setServiceName("%sService"); //去掉Service接口的首字母I gc.setIdType(IdType.ID_WORKER_STR); //主键策略 gc.setDateType(DateType.ONLY_DATE);//定义生成的实体类中日期类型 gc.setSwagger2(true);//开启Swagger2模式 mpg.setGlobalConfig(gc); // 3、数据源配置 ！！ DataSourceConfig dsc = new DataSourceConfig(); dsc.setUrl("jdbc:mysql://localhost:3306/area_product?useSSL=false&useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8"); dsc.setDriverName("com.mysql.jdbc.Driver"); dsc.setUsername("root"); dsc.setPassword("3333"); dsc.setDbType(DbType.MYSQL); mpg.setDataSource(dsc); // 4、包配置！！！ PackageConfig pc = new PackageConfig(); //包 com.atguigu.eduservice pc.setParent("com.zjazn"); pc.setModuleName("smallarea"); //模块名 //包 com.atguigu.eduservice.controller pc.setController("controller"); pc.setEntity("entity"); pc.setService("service"); pc.setMapper("mapper"); mpg.setPackageInfo(pc); // 5、策略配置 StrategyConfig strategy = new StrategyConfig(); //哪些表要生成！！ strategy.setInclude("goods","goods_detail","goods_type_global","goods_type_local"); strategy.setNaming(NamingStrategy.underline_to_camel);//数据库表映射到实体的命名策略 strategy.setTablePrefix(pc.getModuleName() + "_"); //生成实体时去掉表前缀 strategy.setColumnNaming(NamingStrategy.underline_to_camel);//数据库表字段映射到实体的命名策略 strategy.setEntityLombokModel(true); // lombok 模型 @Accessors(chain = true) setter链式操作 strategy.setRestControllerStyle(true); //restful api风格控制器 strategy.setControllerMappingHyphenStyle(true); //url中驼峰转连字符 mpg.setStrategy(strategy); // 6、执行 mpg.execute(); } } -
多条件查询，mapper接口：
package com.zjazn.smallarea.mapper; import com.zjazn.smallarea.entity.Goods; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.zjazn.smallarea.entity.goods; import org.apache.ibatis.annotations.Param; import java.util.List; /** * <p> * Mapper 接口 * </p> * * @author testjava * @since 2021-06-22 */ public interface GoodsMapper extends BaseMapper<Goods> { List<goods> getGoodsByGlobalTypeId(@Param("id") String id,@Param("start_number") Integer start_number , @Param("item_number") Integer item_number ); } -
XML
<?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.zjazn.smallarea.mapper.GoodsMapper"> <resultMap id="goodsLimit" type="com.zjazn.smallarea.entity.goods"> <id column="id" property="id" jdbcType="VARCHAR"></id> <result column="store_id" property="store_id" jdbcType="VARCHAR"></result> <result column="name" property="name" jdbcType="VARCHAR"></result> <result column="describe" property="describe" jdbcType="VARCHAR"></result> <result column="price" property="price" jdbcType="DECIMAL"></result> <result column="cover" property="cover" jdbcType="VARCHAR"></result> </resultMap> <select id="getGoodsByGlobalTypeId" resultType="com.zjazn.smallarea.entity.goods" > SELECT g.id, g.store_id ,gd.name,gd.describe, gd.price, gd.cover FROM goods g LEFT JOIN goods_detail gd ON g.id = gd.goods_id WHERE g.partition_global_id=#{id} LIMIT #{start_number},#{item_number}; </select> </mapper>注意，XML取值还可以使用 #{0} #{1} ...