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mybatis--快速入门

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xuxin
2025-10-26 11:59:59 +08:00
parent 927e8153d2
commit ba92493edc
12 changed files with 317 additions and 4 deletions
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33
springboot-mybatis-quickstart/.gitignore vendored Normal file
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HELP.md
target/
!.mvn/wrapper/maven-wrapper.jar
!**/src/main/**/target/
!**/src/test/**/target/
### STS ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
### IntelliJ IDEA ###
.idea
*.iws
*.iml
*.ipr
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
build/
!**/src/main/**/build/
!**/src/test/**/build/
### VS Code ###
.vscode/

88
springboot-mybatis-quickstart/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.inmind</groupId>
<artifactId>springboot-mybatis-quickstart</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-mybatis-quickstart</name>
<description>springboot-mybatis-quickstart</description>
<properties>
<java.version>11</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>2.7.6</spring-boot.version>
</properties>
<dependencies>
<!--mybatis框架起步依赖-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.3.0</version>
</dependency>
<!--mysql驱动包，操作哪一个数据库，配置对应数据库的驱动-->
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<!--之前版本的驱动包，部分企业还在使用-->
<!--<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>-->
<!--单元测试依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>11</source>
<target>11</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${spring-boot.version}</version>
<configuration>
<mainClass>com.inmind.SpringbootMybatisQuickstartApplication</mainClass>
<skip>true</skip>
</configuration>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

13
springboot-mybatis-quickstart/src/main/java/com/inmind/SpringbootMybatisQuickstartApplication.java Normal file
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package com.inmind;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringbootMybatisQuickstartApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootMybatisQuickstartApplication.class, args);
}
}

16
springboot-mybatis-quickstart/src/main/java/com/inmind/mapper/UserMapper.java Normal file
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package com.inmind.mapper;
import com.inmind.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import java.util.List;
/*
专门操作用户表的Mapper接口
*/
@Mapper//mybatis在运行时，会自动生成该接口的实现类（代理对象），并且将该对象交给Spring容器管理（Bean对象）
public interface UserMapper {
@Select("select * from user")
public List<User> list();
}

71
springboot-mybatis-quickstart/src/main/java/com/inmind/pojo/User.java Normal file
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package com.inmind.pojo;
//对应User表的实体类
public class User {
private Integer id;
private String name;
private Short age;
private Short gender;
private String phone;
public User() {
}
public User(Integer id, String name, Short age, Short gender, String phone) {
this.id = id;
this.name = name;
this.age = age;
this.gender = gender;
this.phone = phone;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Short getAge() {
return age;
}
public void setAge(Short age) {
this.age = age;
}
public Short getGender() {
return gender;
}
public void setGender(Short gender) {
this.gender = gender;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
", gender=" + gender +
", phone='" + phone + '\'' +
'}';
}
}

14
springboot-mybatis-quickstart/src/main/resources/application.properties Normal file
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#下面这些内容是为了让MyBatis映射
#指定Mybatis的Mapper文件
mybatis.mapper-locations=classpath:mappers/*xml
#指定Mybatis的实体目录
mybatis.type-aliases-package=com.inmind.mybatis.entity
#驱动类名称
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#数据库连接的url
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis2
#连接数据库的用户名
spring.datasource.username=root
#连接数据库的密码
spring.datasource.password=1234

31
springboot-mybatis-quickstart/src/test/java/com/inmind/SpringbootMybatisQuickstartApplicationTests.java Normal file
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package com.inmind;
import com.inmind.mapper.UserMapper;
import com.inmind.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;
@SpringBootTest//在进行单元测试时，启动spring程序，启动IOC，将程序中Bean对象加载到容器
class SpringbootMybatisQuickstartApplicationTests {
@Autowired
private UserMapper userMapper;//注入的是mybatis自动生成的UserMapper接口类型的实现类对象
@Test
void contextLoads() {
}
@Test
void testList(){
List<User> userList = userMapper.list();
//通过集合获取Stream流，进行遍历消费，user就是集合中的每个元素，拿到每个元素进行打印消费
// userList.stream().forEach(user -> System.out.println(user));
for (User user : userList) {
System.out.println(user);
}
}
}

1
springboot-web-req-resp/src/main/java/com/inmind/SpringbootWebReqRespApplication.java
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@@ -2,6 +2,7 @@ package com.inmind;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
public class SpringbootWebReqRespApplication {

8
springboot-web-req-resp/src/main/java/com/inmind/controller/EmpController.java
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@@ -6,16 +6,22 @@ import com.inmind.service.EmpService;
import com.inmind.service.impl.EmpServiceImplA;
import com.inmind.utils.XmlParserUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.util.List;
@RestController
public class EmpController {
@Autowired //运行时，IOC容器会提供该类型的bean对象，并赋值给该变量---依赖注入
/*@Autowired //运行时，IOC容器会提供该类型的bean对象，并赋值给该变量---依赖注入
@Qualifier("empServiceImplB")//当依赖注入EmpService类型的bean对象时，优先使用@Qualifier书写的bean对象名称对应的对象
private EmpService empService;*/
@Resource(name = "empServiceImplA")
private EmpService empService;

1
springboot-web-req-resp/src/main/java/com/inmind/dao/impl/EmpDaoImplA.java
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@@ -3,7 +3,6 @@ package com.inmind.dao.impl;
import com.inmind.dao.EmpDao;
import com.inmind.pojo.Emp;
import com.inmind.utils.XmlParserUtils;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import java.util.List;

2
springboot-web-req-resp/src/main/java/com/inmind/service/impl/EmpServiceImplA.java
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@@ -1,11 +1,9 @@
package com.inmind.service.impl;
import com.inmind.dao.EmpDao;
import com.inmind.dao.impl.EmpDaoImplA;
import com.inmind.pojo.Emp;
import com.inmind.service.EmpService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import java.util.List;

43
springboot-web-req-resp/src/main/java/com/inmind/service/impl/EmpServiceImplB.java Normal file
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package com.inmind.service.impl;
import com.inmind.dao.EmpDao;
import com.inmind.pojo.Emp;
import com.inmind.service.EmpService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Service;
import java.util.List;
//@Component //将当前类交给IOC容器管理，成为IOC容器的bean--控制反转
@Service
//@Primary//当依赖注入EmpService类型的bean对象时，优先使用EmpServiceImplB
public class EmpServiceImplB implements EmpService {
@Autowired
private EmpDao empDao;
@Override
public List<Emp> listEmp() {
//业务层从dao层获取数据
List<Emp> emps = empDao.listEmp();
//2.对数据进行转换处理
emps.stream().forEach(emp->{
//处理性别
if (emp.getGender().equals("1")) {
emp.setGender("男生");
}else{
emp.setGender("女生");
}
//处理职务
if (emp.getJob().equals("1")) {
emp.setJob("班主任");
} else if ("2".equals(emp.getJob())) {
emp.setJob("讲师");
} else {
emp.setJob("辅导员");
}
});
return emps;
}
}