文章目录
-
- 1.整合MyBatis
-
-
- 1.需求分析
- 2.数据库表设计
- 3.数据库环境配置
-
- 1.新建maven项目
- 2.pom.xml 引入依赖
- 3.application.yml 配置数据源
- 4.Application.java 编写启动类
- 5.测试
- 6.配置类切换druid数据源
- 7.测试数据源是否成功切换
- 4.Mybatis基础配置
-
- 1.编写映射表的bean
- 2.MonsterMapper.java 编写mapper接口
- 3.MonsterMapper.xml 编写mapper.xml实现mapper接口
- 4.application.yml 扫描mapper.xml配置文件的位置
- 5.测试
- 5.MyBatis高级配置
-
- 1.方式一:在application.yml中配置mybatis.config-location指定mybatis-config.xml配置文件的位置
- 2.方式二:直接在application.yml中配置
- 6.继续编写Service层和Controller层
-
- 1.MonsterService.java
- 2.MonsterServiceImpl.java
- 3.测试
- 4.MonsterController.java
- 5.测试
- 6.解决时间问题
- 7.完整文件目录
-
- 2.整合MyBatis-Plus
-
-
- 1.MyBatis-Plus基本介绍
- 2.数据库表设计
- 3.数据库环境配置
-
- 1.创建maven项目
- 2.pom.xml 导入依赖
- 3.application.yml 配置数据源
- 4.DruidDataSourceConfig.java 配置类切换druid数据源
- 5.编写启动类Application.java,测试运行
- 4.MyBatis-Plus基础配置
-
- 1.编写映射表的bean
- 2.MonsterMapper.java 编写Mapper接口
- 3.测试接口方法使用
- 5.MyBatis-Plus高级配置
-
- application.yml 进行配置
- 6.继续编写Service层和Controller层
-
- 1.MonsterService.java
- 2.MonsterServiceImpl.java
- 3.测试
- 4.细节说明
- 5.MonsterController.java
- 7.细节说明
-
- 1.@MapperScan 扫描包下的所有Mapper
-
- 启动类配置注解
- 2.@TableName bean的类名与表名不一致时使用
- image-20240317200951971
- 3.MyBatis引入了哪些依赖
- 8.MyBatisX快速开发
-
- 1.安装插件
- 2.使用方式
-
- 1.挑一个带小鸟的方法
- 2.直接alt + Enter
- 3.生成sql语句
- 4.查看生成的方法
- 5.点击左边的小鸟就可以直接跳转到指定方法或者xml
- 9.完整文件目录
- 10.MyBatis-Plus小结
-
1.整合MyBatis
1.需求分析
2.数据库表设计
CREATE DATABASE `springboot_mybatis`;use `springboot_mybatis`;CREATE TABLE `monster` (`id` INT NOT NULL AUTO_INCREMENT,`age` INT NOT NULL, `birthday` DATE DEFAULT NULL, `email` VARCHAR(255) DEFAULT NULL,`gender` char(1) DEFAULT NULL,`name` VARCHAR(255) DEFAULT NULL, `salary` DOUBLE NOT NULL,PRIMARY KEY (`id`)
);SELECT * FROM `monster`;insert into monster values(null, 20, '2000-11-11', 'nmw@sohu.com', '男', '牛魔王', 5000.88);
insert into monster values(null, 10, '2011-11-11', 'bgj@sohu.com', '女', '白骨精', 2000.00);
3.数据库环境配置
1.新建maven项目
2.pom.xml 引入依赖
<!--导入springboot父工程--><parent><artifactId>spring-boot-starter-parent</artifactId><groupId>org.springframework.boot</groupId><version>2.5.3</version></parent><!--引入相关依赖--><dependencies><!--常规依赖--><!--web场景启动器--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--lombok--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><!--引入测试场景启动器--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!--配置处理器--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency><!--数据库配置--><!--引入data-jdbc数据源--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jdbc</artifactId></dependency><!--mysql依赖使用版本仲裁--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><!-- 引入 druid 依赖 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.17</version></dependency><!--MyBatis场景启动器--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.2.2</version></dependency></dependencies>
3.application.yml 配置数据源
-
数据库名
-
用户名
-
密码
-
驱动是mysql8的(因为上面使用了版本仲裁)
server:
port: 8080
spring:
datasource: #配置数据源
url: jdbc:mysql://localhost:3306/springboot_mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
4.Application.java 编写启动类
package com.sun.springboot.mybatis;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;/*** @author 孙显圣* @version 1.0*/
@SpringBootApplication
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}
}
5.测试
package com.sun.springboot.mybatis;import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.JdbcTemplate;import javax.annotation.Resource;/*** @author 孙显圣* @version 1.0*/
@SpringBootTest
public class ApplicationTest {//依赖注入@Resourceprivate JdbcTemplate jdbcTemplate;@Testpublic void t1() {//查看目前数据源System.out.println(jdbcTemplate.getDataSource().getClass());}
}
6.配置类切换druid数据源
package com.sun.springboot.mybatis.config;import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.Arrays;/*** @author 孙显圣* @version 1.0*/
@Configuration
public class DruidDataSourceConfig {//注入一个德鲁伊数据源@ConfigurationProperties("spring.datasource") //读取yaml配置文件的参数,获取数据源配置@Beanpublic DataSource dataSource() throws SQLException {DruidDataSource druidDataSource = new DruidDataSource();druidDataSource.setFilters("stat, wall"); //开启sql监控return druidDataSource;}//配置德鲁伊监控sql功能@Beanpublic ServletRegistrationBean statViewServlet() {StatViewServlet statViewServlet = new StatViewServlet();ServletRegistrationBean<StatViewServlet> registrationBean =new ServletRegistrationBean<>(statViewServlet, "/druid/*");//配置登录监控页面用户名和密码registrationBean.addInitParameter("loginUsername", "root");registrationBean.addInitParameter("loginPassword", "root");return registrationBean;}//配置webStatFilter@Beanpublic FilterRegistrationBean webStatFilter() {WebStatFilter webStatFilter = new WebStatFilter();FilterRegistrationBean<WebStatFilter> filterRegistrationBean =new FilterRegistrationBean<>(webStatFilter);//默认对所有 URL 请求监控filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));//排除 URLfilterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");return filterRegistrationBean;}
}
7.测试数据源是否成功切换
package com.sun.springboot.mybatis;import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.JdbcTemplate;import javax.annotation.Resource;/*** @author 孙显圣* @version 1.0*/
@SpringBootTest
public class ApplicationTest {//依赖注入@Resourceprivate JdbcTemplate jdbcTemplate;@Testpublic void t1() {//查看目前数据源System.out.println(jdbcTemplate.getDataSource().getClass());}
}
4.Mybatis基础配置
1.编写映射表的bean
package com.sun.springboot.mybatis.bean;import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;import java.util.Date;/*** @author 孙显圣* @version 1.0*/
@Data
public class Monster {private Integer id;private Integer age;@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone="GMT+8")private Date birthday;private String email;private String name;private String gender;private Double salary;
}
2.MonsterMapper.java 编写mapper接口
-
使用注解注入容器
package com.sun.springboot.mybatis.mapper;
import com.sun.springboot.mybatis.bean.Monster;
import org.apache.ibatis.annotations.Mapper;/**
- @author 孙显圣
- @version 1.0
*/
@Mapper //将接口注入容器
public interface MonsterMapper {
public Monster getMonsterById(Integer id);
}
3.MonsterMapper.xml 编写mapper.xml实现mapper接口
-
使用namespace指定要实现的接口
<?xml version="1.0" encoding="UTF-8" ?> select * from monster where id = #{id}
4.application.yml 扫描mapper.xml配置文件的位置
-
扫描类路径下mapper文件夹下的所有文件
mybatis:
#指定要扫描的mapper.xml
mapper-locations: classpath:mapper/*.xml
5.测试
package com.sun.springboot.mybatis;import com.sun.springboot.mybatis.bean.Monster;
import com.sun.springboot.mybatis.mapper.MonsterMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.JdbcTemplate;import javax.annotation.Resource;/*** @author 孙显圣* @version 1.0*/
@SpringBootTest
public class ApplicationTest {//依赖注入@Resourceprivate JdbcTemplate jdbcTemplate;//注意这里注入的是MonsterMapper的代理对象@Resourceprivate MonsterMapper monsterMapper;@Testpublic void t1() {//查看目前数据源System.out.println(jdbcTemplate.getDataSource().getClass());}@Testpublic void t2() {//测试mybatisMonster monsterById = monsterMapper.getMonsterById(1);System.out.println(monsterById);}
}
5.MyBatis高级配置
1.方式一:在application.yml中配置mybatis.config-location指定mybatis-config.xml配置文件的位置
2.方式二:直接在application.yml中配置
mybatis:#指定要扫描的mapper.xmlmapper-locations: classpath:mapper/*.xml#配置类型别名包,这样只要在这个包下的类型都可以简写type-aliases-package: com/sun/springboot/mybatis/bean#输出日志configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
6.继续编写Service层和Controller层
1.MonsterService.java
package com.sun.springboot.mybatis.service;import com.sun.springboot.mybatis.bean.Monster;/*** @author 孙显圣* @version 1.0*/
public interface MonsterService {public Monster getMonsterById(Integer id);
}
2.MonsterServiceImpl.java
package com.sun.springboot.mybatis.service.Impl;import com.sun.springboot.mybatis.bean.Monster;
import com.sun.springboot.mybatis.mapper.MonsterMapper;
import com.sun.springboot.mybatis.service.MonsterService;
import org.springframework.stereotype.Service;import javax.annotation.Resource;/*** @author 孙显圣* @version 1.0*/
@Service
public class MonsterServiceImpl implements MonsterService {@Resourceprivate MonsterMapper monsterMapper; //返回代理对象@Overridepublic Monster getMonsterById(Integer id) {return monsterMapper.getMonsterById(id);}
}
3.测试
package com.sun.springboot.mybatis;import com.sun.springboot.mybatis.bean.Monster;
import com.sun.springboot.mybatis.mapper.MonsterMapper;
import com.sun.springboot.mybatis.service.MonsterService;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.JdbcTemplate;import javax.annotation.Resource;/*** @author 孙显圣* @version 1.0*/
@SpringBootTest
public class ApplicationTest {//依赖注入@Resourceprivate MonsterService monsterService;@Testpublic void getMonsterById() {Monster monsterById = monsterService.getMonsterById(1);System.out.println(monsterById);}
}
4.MonsterController.java
package com.sun.springboot.mybatis.Controller;import com.sun.springboot.mybatis.bean.Monster;
import com.sun.springboot.mybatis.service.MonsterService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;import javax.annotation.Resource;/*** @author 孙显圣* @version 1.0*/
@Controller
public class MonsterController {@Resourceprivate MonsterService monsterService;@GetMapping("/getMonster/{id}") //路径参数的请求@ResponseBody //响应一个jsonpublic Monster getMonsterById(@PathVariable("id") Integer id) {Monster monsterById = monsterService.getMonsterById(id);return monsterById;}
}
5.测试
6.解决时间问题
7.完整文件目录
2.整合MyBatis-Plus
1.MyBatis-Plus基本介绍
2.数据库表设计
CREATE DATABASE `springboot_mybatisplus`;USE `springboot_mybatisplus`;CREATE TABLE `monster` (
`id` INT NOT NULL AUTO_INCREMENT,
`age` INT NOT NULL,
`birthday` DATE DEFAULT NULL,
`email` VARCHAR(255) DEFAULT NULL,
`gender` CHAR(1) DEFAULT NULL,
`name` VARCHAR(255) DEFAULT NULL,
`salary` DOUBLE NOT NULL,
PRIMARY KEY (`id`)
);
SELECT * FROM `monster`;
INSERT INTO monster VALUES(NULL, 20, '2000-11-11', 'xzj@sohu.com', '男', ' 蝎 子 精 ',
15000.88);
INSERT INTO monster VALUES(NULL, 10, '2011-11-11', 'ytj@sohu.com', '女', ' 玉 兔 精 ',
18000.88);
3.数据库环境配置
1.创建maven项目
2.pom.xml 导入依赖
<!--导入springboot父工程--><parent><artifactId>spring-boot-starter-parent</artifactId><groupId>org.springframework.boot</groupId><version>2.5.3</version></parent><!--引入相关依赖--><dependencies><!--常规依赖--><!--web场景启动器--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--lombok--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><!--引入测试场景启动器--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!--配置处理器--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency><!--数据库配置--><!--mysql依赖使用版本仲裁--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><!-- 引入 druid 依赖 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.17</version></dependency><!--引入MyBatis-Plus场景启动器,会自动引入jdbc和MyBatis--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.4.3</version></dependency></dependencies>
3.application.yml 配置数据源
-
数据库名称
-
用户名
-
密码
server:
port: 8080
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/springboot_mybatisplus?useSSL=false&useUnicode=true&characterEncoding=UTF-8
username: root
password: root
4.DruidDataSourceConfig.java 配置类切换druid数据源
package com.sun.springboot.mybatisplus.config;import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.Arrays;/*** @author 孙显圣* @version 1.0*/
@Configuration
public class DruidDataSourceConfig {//注入一个德鲁伊数据源@ConfigurationProperties("spring.datasource") //读取yaml配置文件的参数,获取数据源配置@Beanpublic DataSource dataSource() throws SQLException {DruidDataSource druidDataSource = new DruidDataSource();druidDataSource.setFilters("stat, wall"); //开启sql监控return druidDataSource;}//配置德鲁伊监控sql功能@Beanpublic ServletRegistrationBean statViewServlet() {StatViewServlet statViewServlet = new StatViewServlet();ServletRegistrationBean<StatViewServlet> registrationBean =new ServletRegistrationBean<>(statViewServlet, "/druid/*");//配置登录监控页面用户名和密码registrationBean.addInitParameter("loginUsername", "root");registrationBean.addInitParameter("loginPassword", "root");return registrationBean;}//配置webStatFilter@Beanpublic FilterRegistrationBean webStatFilter() {WebStatFilter webStatFilter = new WebStatFilter();FilterRegistrationBean<WebStatFilter> filterRegistrationBean =new FilterRegistrationBean<>(webStatFilter);//默认对所有 URL 请求监控filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));//排除 URLfilterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");return filterRegistrationBean;}
}
5.编写启动类Application.java,测试运行
package com.sun.springboot.mybatisplus;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;/*** @author 孙显圣* @version 1.0*/
@SpringBootApplication
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}
}
4.MyBatis-Plus基础配置
1.编写映射表的bean
package com.sun.springboot.mybatisplus.bean;import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;import java.util.Date;/*** @author 孙显圣* @version 1.0*/
@Data
public class Monster {private Integer id;private Integer age;@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")private Date birthday;private String email;private String name;private String gender;private Double salary;
}
2.MonsterMapper.java 编写Mapper接口
package com.sun.springboot.mybatisplus.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.sun.springboot.mybatisplus.bean.Monster;
import org.apache.ibatis.annotations.Mapper;/*** @author 孙显圣* @version 1.0*/
//直接继承BaseMapper接口
@Mapper //注入容器
public interface MonsterMapper extends BaseMapper<Monster> {//如果提供的方法不够用再自定义方法
}
3.测试接口方法使用
package com.sun.springboot.mybatisplus;import com.sun.springboot.mybatisplus.bean.Monster;
import com.sun.springboot.mybatisplus.mapper.MonsterMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;import javax.annotation.Resource;/*** @author 孙显圣* @version 1.0*/
@SpringBootTest
public class MonsterMapperTest {//注入针对Mapper接口的代理对象@Resourceprivate MonsterMapper monsterMapper;@Testpublic void t1() {Monster monster = monsterMapper.selectById(1);System.out.println(monster);}
}
5.MyBatis-Plus高级配置
application.yml 进行配置
#进行mybatis-plus配置
mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
6.继续编写Service层和Controller层
1.MonsterService.java
package com.sun.springboot.mybatisplus.service.Impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sun.springboot.mybatisplus.bean.Monster;
import com.sun.springboot.mybatisplus.mapper.MonsterMapper;
import com.sun.springboot.mybatisplus.service.MonsterService;
import org.springframework.stereotype.Service;/*** 这里* @author 孙显圣* @version 1.0*/
@Service
public class MonsterServiceImpl extends ServiceImpl<MonsterMapper, Monster> implements MonsterService {//自定义方法实现
}
2.MonsterServiceImpl.java
package com.sun.springboot.mybatisplus.service.Impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sun.springboot.mybatisplus.bean.Monster;
import com.sun.springboot.mybatisplus.mapper.MonsterMapper;
import com.sun.springboot.mybatisplus.service.MonsterService;
import org.springframework.stereotype.Service;/*** 这里* @author 孙显圣* @version 1.0*/
@Service
public class MonsterServiceImpl extends ServiceImpl<MonsterMapper, Monster> implements MonsterService {//自定义方法实现
}
3.测试
package com.sun.springboot.mybatisplus;import com.sun.springboot.mybatisplus.bean.Monster;
import com.sun.springboot.mybatisplus.mapper.MonsterMapper;
import com.sun.springboot.mybatisplus.service.MonsterService;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;import javax.annotation.Resource;/*** @author 孙显圣* @version 1.0*/
@SpringBootTest
public class MonsterServiceTest {@Resourceprivate MonsterService monsterService;@Testpublic void t1() {Monster byId = monsterService.getById(2);System.out.println(byId);}
}
4.细节说明
- 简单来说就是MonsterServiceImpl只需要实现MonsterService接口的方法
- 可以调用IService接口的方法,也可以调用MonsterService接口的方法
5.MonsterController.java
package com.sun.springboot.mybatisplus.controller;import com.sun.springboot.mybatisplus.bean.Monster;
import com.sun.springboot.mybatisplus.service.MonsterService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;import javax.annotation.Resource;/*** @author 孙显圣* @version 1.0*/
@Controller
public class MonsterController {@Resource//注入的是MonsterServiceImpl的bean对象,可以直接调用IService接口的方法private MonsterService monsterService;@GetMapping("/getMonster/{id}")@ResponseBodypublic Monster getMonsterById(@PathVariable("id") Integer id) {Monster byId = monsterService.getById(id);return byId;}
}