SpringBoot使用mybatis步驟總結(jié)

更新時間：2021年06月18日 09:45:24 作者：冷血～多好

今天給大家?guī)淼氖顷P(guān)于Java的相關(guān)知識,文章圍繞著SpringBoot使用mybatis步驟展開,文中有非常詳細(xì)的介紹及代碼示例,需要的朋友可以參考下

SpringBoot使用mybatis

1.導(dǎo)入 MyBatis 所需要的依賴

<!--mybatis-spring-boot-starter:整合-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.4</version>
        </dependency>
 
          <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
            <scope>runtime</scope>
        </dependency>
        
          <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

2.配置數(shù)據(jù)庫連接信息(application.properties)

spring.datasource.username=root
spring.datasource.password=123
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

測試：

@SpringBootTest
class Springboot05MybatisApplicationTests {
 
 
    @Autowired
    DataSource dataSource;
 
    @Test
    void contextLoads() throws SQLException {
 
        System.out.println(dataSource.getClass());
        System.out.println(dataSource.getConnection());
 
    }
 
}

打印出：class com.zaxxer.hikari.HikariDataSource
HikariProxyConnection@1172943149 wrapping com.mysql.jdbc.JDBC4Connection@3dc95b8b

說明配置完成

3.然后進(jìn)行crud操作：

先編寫一個實體類：（注意這里使用了lombok插件)

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
 
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
 
    private int id;
    private String name;
    private String pwd;
 
 
 
}

創(chuàng)建mapper目錄以及對應(yīng)的 Mapper 接口

import com.chen.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
 
import java.util.List;
 
 
//這個注解表示了這時一個mybatis的mapper類：Dao
@Mapper
 
@Repository
public interface UserMapper {
 
 
    List<User> queryUserList();
 
    User queryUserById(int id);
 
    int addUSer(User user);
 
    int updateUser(User user);
 
    int deleteUser(int id);
 
}

對應(yīng)的Mapper映射文件

<?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.chen.mapper.UserMapper">
 
 
    <!--select查詢語句-->
    <!--id為方法名,resultType為結(jié)果返回類型-->
    <select id="queryUserList" resultType="User">
    select * from mybatis.user;
  </select>
 
 
 
 
    <!--通過id進(jìn)行select查詢語句，parameterType為傳參類型，resultType為結(jié)果返回類型-->
    <select id="queryUserById"  parameterType="int" resultType="User">
      select *from mybatis.user where id=#{id};
   </select>
 
 
    <!--插入語句，對象中的屬性，可以直接取出來-->
    <insert id="addUSer" parameterType="User" >
          insert into mybatis.user(name,pwd) values (#{name},#{pwd});
      </insert>
 
 
 
 
 
    <!--更改用戶語句-->
    <insert id="updateUser" parameterType="User" >
        update mybatis.user set name =#{name},pwd=#{pwd} where id=#{id};
      </insert>
 
 
 
    <!--刪除用戶-->
    <delete id="deleteUser" parameterType="int">
        delete from mybatis.user where id=#{id};
    </delete>
 
 
</mapper>

編寫用戶的UserController 進(jìn)行測試！

import com.chen.mapper.UserMapper;
import com.chen.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
import java.util.List;
 
@RestController
public class UserController {
 
    @Autowired
    private UserMapper userMapper;
 
    @GetMapping("/queryUserList")
    public List<User> queryUserList(){
        List<User> userList=userMapper.queryUserList();
        for(User user:userList){
            System.out.println(user);
        }
        return  userList;
    }
 
    //添加一個用戶
    @GetMapping("/addUser")
    public String addUser(){
        int n=userMapper.addUSer(new User(5,"阿毛","4566977"));
        return String.valueOf(n);
    }
 
    //修改一個用戶
    @GetMapping("/updateUser")
    public String updateUser(){
        int n=userMapper.updateUser(new User(5,"阿毛","4566977"));
        return String.valueOf(n);
    }
 
    //刪除一個用戶
    @GetMapping("/deleteUser")
    public String deleteUser(){
        int n=userMapper.deleteUser(18);
        return String.valueOf(n);
    }
 
}

最后創(chuàng)建該實體類數(shù)據(jù)庫：mybatis

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(25) CHARACTER SET gbk COLLATE gbk_chinese_ci NULL DEFAULT NULL,
  `pwd` varchar(25) CHARACTER SET gbk COLLATE gbk_chinese_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 18 CHARACTER SET = gbk COLLATE = gbk_chinese_ci ROW_FORMAT = Compact;
 
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (3, '小黑', '789');
INSERT INTO `user` VALUES (4, '可可2', '151');
INSERT INTO `user` VALUES (5, '阿毛', '4566977');
INSERT INTO `user` VALUES (6, '小明', 'cafa1414f');
INSERT INTO `user` VALUES (7, '嘻嘻3', '101112');
INSERT INTO `user` VALUES (8, '很愛很愛你', '101112');
INSERT INTO `user` VALUES (9, '小霞', '159');
INSERT INTO `user` VALUES (10, '嘻嘻5', '101112');
INSERT INTO `user` VALUES (11, '陳錦賢', 'dad45');
INSERT INTO `user` VALUES (12, '陳錦賢2', 'd2ad45');
INSERT INTO `user` VALUES (13, '小明', '123456');
INSERT INTO `user` VALUES (14, '小明2', '456');
INSERT INTO `user` VALUES (17, '阿毛', '4566977');
 
SET FOREIGN_KEY_CHECKS = 1;

然后就可以啟動項目進(jìn)行測試了：

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