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這篇文章主要介紹Spring Boot數據訪問之Mybatis的示例分析,文中介紹的非常詳細,具有一定的參考價值,感興趣的小伙伴們一定要看完!
JDBC:Java和關系型數據庫的橋梁,是一個規范,不是實現。不同類型的數據庫需要有自己的JDBC實現
數據源:包含數據庫連接池,連接池管理。常見的有C3P0、HikariDataSoiurce、Druid等
連接池:預先創建一些數據庫連接,放到連接池里面,用的時候從連接池里面取,用完后放回連接池
連接池管理:創建數據庫連接,管理數據庫連接
JDBC實現:MySQL JDBC實現、Oracle JDBC實現等其他實現
MyBatis對JDBC進行了封裝
我們基于之前創建的項目spring-boot-06-data-druid 來創建spring-boot-07-data-mybatis項目
1)引入MyBatis依賴
<!-- mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
2)引入其他依賴
<dependencies>
<!-- web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- swagger -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.9.2</version>
</dependency>
<!-- Druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.21</version>
</dependency>
3)依賴圖
DROP TABLE IF EXISTS `department`;
CREATE TABLE `department` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`department_name` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
initialization-mode: always
schema:
- classpath:department.sql
執行一次后,注釋 initialization-mode
# initialization-mode: always
package com.jackson0714.springboot.entity;
public class Department {
private Long id;
private String departmentName;
public void setId(Long id) {
this.id = id;
}
public Long getId() {
return id;
}
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}
public String getDepartmentName() {
return departmentName;
}
}
增刪改查,你要的都在這里:
@Mapper
public interface DepartmentMapper {
@Select("select * from department")
List<Map<String, Object>> getAllDepartment();
@Select("select * from department where id=#{id}")
Department getDepartmentById(Long id);
@Delete("delete from department where id=#{id}")
int deleteDepartment(Long id);
@Insert("insert into department(department_name) values(#{departmentName})")
int createDepartment(String departmentName);
@Update("update department set department_name=#{departmentName} where id=#{id}")
int updateDepartmentById(Long id, String departmentName);
}
增加自定義配置:如果表的字段名有下劃線格式的,轉為駝峰命名格式
@org.springframework.context.annotation.Configurationpublic class MyBatisConfig { @Bean public ConfigurationCustomizer configurationCustomizer() { return new ConfigurationCustomizer() { @Override public void customize(Configuration configuration) { // 如果表的字段名有下劃線格式的,轉為駝峰命名格式 configuration.setMapUnderscoreToCamelCase(true); } }; }}
@Api(value = "DepartmentController", description = "部門controller")
@RequestMapping("/v1/client")
@RestController
public class DepartmentController {
@Autowired
DepartmentMapper departmentMapper;
@ApiOperation(value = "1.查詢所有部門")
@GetMapping("/dept/getAllDepartment")
public List<Map<String, Object>> getAllDepartment() {
return departmentMapper.getAllDepartment();
}
@ApiOperation(value = "2.根據id查詢某個部門")
@ApiImplicitParams({
@ApiImplicitParam(name = "id", value = "需要查詢的部門id")
})
@GetMapping("/dept/{id}")
public Department getDepartmentById(@PathVariable Long id) {
return departmentMapper.getDepartmentById(id);
}
@ApiOperation(value = "3.新增部門")
@ApiImplicitParams({
@ApiImplicitParam(name = "name", value = "部門名稱")
})
@PostMapping("/dept/create")
public int createDepartment(@RequestParam String name) {
return departmentMapper.createDepartment(name);
}
@ApiOperation(value = "4.根據id刪除部門")
@ApiImplicitParams({
@ApiImplicitParam(name = "id", value = "需要刪除的部門id")
})
@PostMapping("/dept/delete")
public int deleteDepartment(@RequestParam Long id) {
return departmentMapper.deleteDepartment(id);
}
@ApiOperation(value = "5.根據id更新部門名稱")
@ApiImplicitParams({
@ApiImplicitParam(name = "id", value = "需要更新的部門id"),
@ApiImplicitParam(name = "name", value = "需要更新的部門名稱")
})
@PostMapping("/dept/update")
public int updateDepartmentById(@RequestParam Long id, @RequestParam String name) {
return departmentMapper.updateDepartmentById(id, name);
}
}
使用Swagger來測試
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`user_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主鍵ID',
`user_name` varchar(255) COLLATE utf8mb4_bin NOT NULL COMMENT '用戶名',
`password` varchar(255) COLLATE utf8mb4_bin NOT NULL,
`salt` varchar(255) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '隨機鹽',
`nickName` varchar(255) COLLATE utf8mb4_bin NOT NULL COMMENT '用戶名',
`phone` varchar(20) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '手機號',
`avatar` varchar(255) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '頭像',
`mini_openId` varchar(32) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '小程序OpenId',
`lock_flag` char(1) COLLATE utf8mb4_bin DEFAULT '0' COMMENT '0-正常,9-鎖定',
`del_flag` char(1) COLLATE utf8mb4_bin DEFAULT '0' COMMENT '0-正常,1-刪除',
`create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '創建時間',
`update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新時間',
PRIMARY KEY (`user_id`),
KEY `user_wx_openid` (`mini_openId`),
KEY `user_idx1_username` (`user_name`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci ROW_FORMAT=DYNAMIC COMMENT='用戶表';
INSERT INTO user(user_name, password, nick_name, phone) values ("jackson0714", "123", "悟空聊架構", "123456")
package com.jackson0714.springboot.entity;
import lombok.Data;
import java.sql.Timestamp;
@Data
public class User {
private Long userId;
private String userName;
private String password;
private String salt;
private String nickName;
private String phone;
private String avatar;
private String miniOpenId;
private String openId;
private Boolean lockFlag;
private Boolean delFlag;
private Timestamp createTime;
private Timestamp updateTime;
}
需要安裝Lombok插件
需要引入Lombok依賴
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
<scope>provided</scope>
</dependency>
// @Mapper 或MapperScan 將接口掃描裝配到裝配容器中
public interface UserMapper {
User getUserById(Long userId);
}
<?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.jackson0714.springboot.mapper.UserMapper">
<select id="getUserById" resultType="com.jackson0714.springboot.entity.User">
SELECT * FROM user WHERE user_id=#{userId}
</select>
</mapper>
@Api(value = "UserController", description = "用戶controller")
@RequestMapping("/v1/client")
@RestController
public class UserController {
@Autowired
UserMapper userMapper;
@ApiOperation(value = "1.根據id查詢某個用戶")
@ApiImplicitParams({
@ApiImplicitParam(name = "需要查詢的用戶userId", value = "需要查詢的用戶userId")
})
@GetMapping("/emp/{userId}")
public User getUser(@PathVariable("userId") Long userId) {
return userMapper.getUserById(userId);
}
}
@MapperScan(value = "com.jackson0714.springboot.mapper")@SpringBootApplicationpublic class Springboot07DataMybatisApplication { public static void main(String[] args) { SpringApplication.run(Springboot07DataMybatisApplication.class, args); }}
代碼下載:
https://github.com/Jackson0714/study-spring-boot.git
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