.net网站开发模板,六安网站,工业设计公司宣传语,网站设计公司网站设计1. MyBatis-Plus快速入门
版本 3.5.31并非另起炉灶 , 而是MyBatis的增强 , 使用之前依然要导入MyBatis的依赖 , 且之前MyBatis的所有功能依然可以使用.局限性是仅限于单表操作, 对于多表仍需要手写
项目结构#xff1a;
先导入依赖#xff0c;比之前多了一个mybatis-plus…1. MyBatis-Plus快速入门
版本 3.5.31并非另起炉灶 , 而是MyBatis的增强 , 使用之前依然要导入MyBatis的依赖 , 且之前MyBatis的所有功能依然可以使用.局限性是仅限于单表操作, 对于多表仍需要手写
项目结构
先导入依赖比之前多了一个mybatis-plus-boot-starter
?xml version1.0 encodingUTF-8?
project xmlnshttp://maven.apache.org/POM/4.0.0xmlns:xsihttp://www.w3.org/2001/XMLSchema-instancexsi:schemaLocationhttp://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsdmodelVersion4.0.0/modelVersionparentgroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-parent/artifactIdversion3.0.5/version/parentgroupIdcom.sunsplanter/groupIdartifactIdSpring-With-MybatisPlus/artifactIdversion1.0-SNAPSHOT/versionpropertiesmaven.compiler.source17/maven.compiler.sourcemaven.compiler.target17/maven.compiler.targetproject.build.sourceEncodingUTF-8/project.build.sourceEncoding/propertiesdependenciesdependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter/artifactId/dependency!-- 测试环境 --dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-test/artifactId/dependency!-- mybatis-plus --dependencygroupIdcom.baomidou/groupIdartifactIdmybatis-plus-boot-starter/artifactIdversion3.5.3.1/version/dependency!-- 数据库相关配置启动器 --dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-jdbc/artifactId/dependency!-- druid启动器的依赖 --dependencygroupIdcom.alibaba/groupIdartifactIddruid-spring-boot-3-starter/artifactIdversion1.2.20/version/dependency!-- 驱动类--dependencygroupIdmysql/groupIdartifactIdmysql-connector-java/artifactIdversion8.0.28/version/dependencydependencygroupIdorg.projectlombok/groupIdartifactIdlombok/artifactIdversion1.18.28/version/dependency/dependencies连接池配置
# 连接池配置
spring:datasource:type: com.alibaba.druid.pool.DruidDataSourcedruid:url: jdbc:mysql://localhost:3306/carresellerusername: rootpassword: driver-class-name: com.mysql.cj.jdbc.Driver
实体类
Data
public class User {private Long id;private String name;private Integer age;private String email;
}mapper接口
package com.sunsplanter.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.sunsplanter.pojo.User;//
public interface UserMapper extends BaseMapperUser {//之前mapper接口内要声明抽象方法然后再mapper.xml中具体写查询语句//ListUser queryAll();//现在继承自BaseMapper其内已定义了几乎所有单表查询语句//故UserMapper也拥有了这些方法无需再写
}采用测试类的方法不需要定义main方法启动类
package com.sunsplanter.test;import com.sunsplanter.mapper.UserMapper;
import com.sunsplanter.pojo.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;import java.util.List;//SpringBoot的专有测试注解可以帮我们自动初始化IoC容器想要什么直接拿即可
SpringBootTest
public class SpringWithMyBatisPlusTest {Autowiredprivate UserMapper userMapper;//加Test注解为了能执行单个测试方法Testpublic void test(){//该方法查询全部//参数是一个Wrapper条件结构器这里先不用 填nullListUser user userMapper.selectList(null);System.out.println(user);}
}
