详解Spring Boot实战之Rest接口开发及数据库基本操作

发布时间：2020-10-06 04:07:35 来源：脚本之家阅读：216 作者：sun_t89 栏目：编程语言

本文介绍了Spring Boot实战之Rest接口开发及数据库基本操作，分享给大家

1、修改pom.xml，添加依赖库,本文使用的是mysql

 <dependency> 
<groupId>org.springframework.boot</groupId> 
<artifactId>spring-boot-starter-data-jpa</artifactId> 
</dependency> 
<dependency> 
<groupId>mysql</groupId> 
<artifactId>mysql-connector-java</artifactId> 
</dependency>

2、修改配置文件application.properties，配置数据源及java持久层API相关信息

spring.datasource.url = jdbc:mysql://127.0.0.1:3306/springlearn 
spring.datasource.username = root 
spring.datasource.password = root 
spring.datasource.driverClassName = com.mysql.jdbc.Driver 
 
 
# 配置数据库 
spring.jpa.database = MYSQL 
# 查询时是否显示日志 
spring.jpa.show-sql = true 
# Hibernate ddl auto (create, create-drop, update) 
spring.jpa.hibernate.ddl-auto = update 
# Naming strategy 
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy 
# stripped before adding them to the entity manager) 
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

3、添加数据模型 UserInfo.java

package com.xiaofangtech.sunt.bean; 
 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.Table; 
import javax.validation.constraints.NotNull; 
 
@Entity 
@Table(name="t_user") 
public class UserInfo { 
  @Id 
  @GeneratedValue(strategy = GenerationType.AUTO) 
  private int id; 
  @NotNull 
  private String name; 
   
  private String password; 
   
  private String salt; 
   
  private String role; 
 
  public int getId() { 
    return id; 
  } 
 
  public void setId(int id) { 
    this.id = id; 
  } 
 
  public String getName() { 
    return name; 
  } 
 
  public void setName(String name) { 
    this.name = name; 
  } 
 
  public String getPassword() { 
    return password; 
  } 
 
  public void setPassword(String password) { 
    this.password = password; 
  } 
 
  public String getSalt() { 
    return salt; 
  } 
 
  public void setSalt(String salt) { 
    this.salt = salt; 
  } 
 
  public String getRole() { 
    return role; 
  } 
 
  public void setRole(String role) { 
    this.role = role; 
  } 
}

4、添加数据访问接口类 UserInfoRepository.java

package com.xiaofangtech.sunt.repository; 
 
import java.util.List; 
 
import org.springframework.data.jpa.repository.Query; 
import org.springframework.data.repository.CrudRepository; 
 
import com.xiaofangtech.sunt.bean.UserInfo; 
 
public interface UserInfoRepository extends CrudRepository<UserInfo, Integer>{ 
  UserInfo findUserInfoById(int id); 
  List<UserInfo> findUserInfoByRole(String role); 
   
  @Query(value = "select * from t_user limit ?1", nativeQuery =true) 
  List<UserInfo> findAllUsersByCount(int count); 
}

5、添加UserController.java，添加用户信息的增删改查操作

package com.xiaofangtech.sunt.controller; 
 
import java.util.List; 
 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.data.jpa.repository.Modifying; 
import org.springframework.web.bind.annotation.RequestBody; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RestController; 
 
import com.xiaofangtech.sunt.bean.UserInfo; 
import com.xiaofangtech.sunt.repository.UserInfoRepository; 
import com.xiaofangtech.sunt.utils.ResultMsg; 
import com.xiaofangtech.sunt.utils.ResultStatusCode; 
 
@RestController 
@RequestMapping("user") 
public class UserController { 
  @Autowired 
  private UserInfoRepository userRepositoy; 
   
  @RequestMapping("getuser") 
  public Object getUser(int id) 
  { 
    UserInfo userEntity = userRepositoy.findUserInfoById(id); 
    ResultMsg resultMsg = new ResultMsg(ResultStatusCode.OK.getErrcode(), ResultStatusCode.OK.getErrmsg(), userEntity); 
    return resultMsg; 
  } 
   
  @RequestMapping("getusers") 
  public Object getUsers(String role) 
  { 
    List<UserInfo> userEntities = userRepositoy.findUserInfoByRole(role); 
    ResultMsg resultMsg = new ResultMsg(ResultStatusCode.OK.getErrcode(), ResultStatusCode.OK.getErrmsg(), userEntities); 
    return resultMsg; 
  } 
   
  @Modifying 
  @RequestMapping("adduser") 
  public Object addUser(@RequestBody UserInfo userEntity) 
  { 
    userRepositoy.save(userEntity); 
    ResultMsg resultMsg = new ResultMsg(ResultStatusCode.OK.getErrcode(), ResultStatusCode.OK.getErrmsg(), userEntity); 
    return resultMsg; 
  } 
   
  @Modifying 
  @RequestMapping("updateuser") 
  public Object updateUser(@RequestBody UserInfo userEntity) 
  { 
    UserInfo user = userRepositoy.findUserInfoById(userEntity.getId()); 
    if (user != null) 
    { 
      user.setName(userEntity.getName()); 
      userRepositoy.save(user); 
    } 
    ResultMsg resultMsg = new ResultMsg(ResultStatusCode.OK.getErrcode(), ResultStatusCode.OK.getErrmsg(), null); 
    return resultMsg; 
  } 
   
  @Modifying 
  @RequestMapping("deleteuser") 
  public Object deleteUser(int id) 
  { 
    userRepositoy.delete(id); 
    ResultMsg resultMsg = new ResultMsg(ResultStatusCode.OK.getErrcode(), ResultStatusCode.OK.getErrmsg(), null); 
    return resultMsg; 
  } 
}

6、封装返回的结果

添加ResultMsg.java

package com.xiaofangtech.sunt.utils; 
 
public class ResultMsg { 
  private int errcode; 
  private String errmsg; 
  private Object p2pdata; 
   
  public ResultMsg(int ErrCode, String ErrMsg, Object P2pData) 
  { 
    this.errcode = ErrCode; 
    this.errmsg = ErrMsg; 
    this.p2pdata = P2pData; 
  } 
  public int getErrcode() { 
    return errcode; 
  } 
  public void setErrcode(int errcode) { 
    this.errcode = errcode; 
  } 
  public String getErrmsg() { 
    return errmsg; 
  } 
  public void setErrmsg(String errmsg) { 
    this.errmsg = errmsg; 
  } 
  public Object getP2pdata() { 
    return p2pdata; 
  } 
  public void setP2pdata(Object p2pdata) { 
    this.p2pdata = p2pdata; 
  } 
}

添加枚举类ResultStatusCode.java

package com.xiaofangtech.sunt.utils; 
 
public enum ResultStatusCode { 
  OK(0, "OK"), 
  SYSTEM_ERR(30001, "System error"); 
   
  private int errcode; 
  private String errmsg; 
  public int getErrcode() { 
    return errcode; 
  } 
 
  public void setErrcode(int errcode) { 
    this.errcode = errcode; 
  } 
 
  public String getErrmsg() { 
    return errmsg; 
  } 
 
  public void setErrmsg(String errmsg) { 
    this.errmsg = errmsg; 
  } 
  private ResultStatusCode(int Errode, String ErrMsg) 
  { 
    this.errcode = Errode; 
    this.errmsg = ErrMsg; 
  } 
}

7、工程整体结构

详解Spring Boot实战之Rest接口开发及数据库基本操作

8、运行测试，本文中测试使用的是user表，其中包含一些密码等信息未做处理，这个读者自行进行JsonIgnore处理

提供以下5个接口

http://localhost:8080/user/adduser

http://localhost:8080/user/updateuser

http://localhost:8080/user/getuser?id=13

http://localhost:8080/user/getusers?role=Manager

http://localhost:8080/user/deleteuser?id=13

测试运行结果

adduser接口

详解Spring Boot实战之Rest接口开发及数据库基本操作

updateuser接口

详解Spring Boot实战之Rest接口开发及数据库基本操作

getuser接口

详解Spring Boot实战之Rest接口开发及数据库基本操作

9、调用以上接口时执行数据库操作时，会在内部转化为以下SQL语句

Hibernate: insert into t_user (name, password, role, salt) values (?, ?, ?, ?)


Hibernate: select userinfo0_.id as id1_0_, userinfo0_.name as name2_0_, userinfo0_.password as password3_0_, userinfo0_.role as role4_0_, userinfo0_.salt as salt5_0_ from t_user userinfo0_ where userinfo0_.id=?
Hibernate: update t_user set name=?, password=?, role=?, salt=? where id=?


Hibernate: select userinfo0_.id as id1_0_, userinfo0_.name as name2_0_, userinfo0_.password as password3_0_, userinfo0_.role as role4_0_, userinfo0_.salt as salt5_0_ from t_user userinfo0_ where userinfo0_.id=?


Hibernate: select userinfo0_.id as id1_0_, userinfo0_.name as name2_0_, userinfo0_.password as password3_0_, userinfo0_.role as role4_0_, userinfo0_.salt as salt5_0_ from t_user userinfo0_ where userinfo0_.role=?


Hibernate: select userinfo0_.id as id1_0_0_, userinfo0_.name as name2_0_0_, userinfo0_.password as password3_0_0_, userinfo0_.role as role4_0_0_, userinfo0_.salt as salt5_0_0_ from t_user userinfo0_ where userinfo0_.id=?
Hibernate: delete from t_user where id=?

10、数据库操作

JPA模块支持将查询字符串定义在方法名称中

如上例中

根据id值查询UserInfo实例

UserInfo findUserInfoById(int id);

根据role查询UserInfo实例

List<UserInfo> findUserInfoByRole(String role);

也可以直接使用原生的数据库语句

如下使用@Query注解

@Query(value = "select * from t_user limit ?1", nativeQuery =true)
List<UserInfo> findAllUsersByCount(int count);

11、在方法名中添加查询字符串参考

详解Spring Boot实战之Rest接口开发及数据库基本操作

本文源码下载：http://xiazai.jb51.net/201707/yuanma/SpringRest_jb51.rar

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详解Spring Boot实战之Rest接口开发及数据库基本操作

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