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mybatis首个创建相关步骤

news 来源：原创 2025/4/28 7:11:31

1。先关联数据库，用户，密码，数据库保持一致

2.添加包和类

1.User放和数据库属性一样的

package com.it.springbootmybatis01.pojo;@lombok.Data
@lombok.AllArgsConstructor
@lombok.NoArgsConstructor
public class User {private Integer id;private String username;private String password;private String name;private String age;
}2.UserMapper放数据库操作的注解

package com.it.springbootmybatis01.mapper;import com.it.springbootmybatis01.pojo.User;
import org.apache.ibatis.annotations.*;import java.util.List;@Mapper//表示应用程序在运行过程中，会通过这个接口来创建一个实现类对象，这个对象就是MyBatis的代理对象，并且会把这个对象交给Spring容器IOC管理
public interface UserMapper {//查询所有用户// @Select("select * from user")public List<User> FindAll();@Delete("delete from user where id=#{id}")public void deleteById(Integer id);@Insert("insert into user(username,password,name,age) values(#{username},#{password},#{name},#{age})")public void insert(User user);@Update("update user set username=#{username},password=#{password},name=#{name},age=#{age} where id=#{id}")public void update(User user);@Select("select * from user where username=#{username} and password=#{password}")public User findByUsernameAndPassword(@Param("username") String username, @Param("password") String password);//多个形参要用@Param注解给形参起别名}

3.UserMapper.xml放复杂的操作注解

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.it.springbootmybatis01.mapper.UserMapper"><select id="FindAll" resultType="com.it.springbootmybatis01.pojo.User">select id,username,password,name,age from user</select></mapper>

（注意包名和上面一样，文件名和接口名一样）

4.SpringbootMybatis01ApplicationTests放测试

package com.it.springbootmybatis01;import com.it.springbootmybatis01.mapper.UserMapper;
import com.it.springbootmybatis01.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//springboot测试类
class SpringbootMybatis01ApplicationTests {@Autowiredprivate UserMapper userMapper;@Testpublic void testFindAll(){//调用方法List<User> userList = userMapper.FindAll();userList.forEach(System.out::println);}@Testpublic void testDeleteById(){//调用方法userMapper.deleteById(5);}@Testpublic void testInsert(){//调用方法User user = new User(null,"小明","123456","小明","18");userMapper.insert(user);}@Testpublic void testUpdate(){//调用方法User user = new User(2,"大红","123456","大红","18");userMapper.update(user);}@Testpublic void testFindByUsernameAndPassword(){//调用方法User user = userMapper.findByUsernameAndPassword("大红","123456");System.out.println(user);}}

5.pom.xml放相关依赖

<?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.it</groupId><artifactId>springboot-mybatis01</artifactId><version>0.0.1-SNAPSHOT</version><name>springboot-mybatis01</name><description>springboot-mybatis01</description><properties><java.version>17</java.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><spring-boot.version>3.0.2</spring-boot.version></properties><dependencies><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>3.0.0</version></dependency><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><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>${spring-boot.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.8.1</version><configuration><source>17</source><target>17</target><encoding>UTF-8</encoding></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>${spring-boot.version}</version><configuration><mainClass>com.it.springbootmybatis01.SpringbootMybatis01Application</mainClass><skip>true</skip></configuration><executions><execution><id>repackage</id><goals><goal>repackage</goal></goals></execution></executions></plugin></plugins></build></project>

6.配置文件application.properties

#下面这些内容是为了让MyBatis映射
#指定Mybatis的Mapper文件#如果没有按照要求建xml配置文件，需要在这里指定地址
mybatis.mapper-locations=classpath:mappers/*xml
#指定Mybatis的实体目录
mybatis.type-aliases-package=com.it.springbootmybatis01.mybatis.entity#配置数据库的联接信息
spring.datasource.url=jdbc:mysql://localhost:3306/web01
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=q1q1q1q1q1q1#配置MyBatis日志输出
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl