详解Spring Boot实战之Rest接口开发及数据库基本操作-eolink官网

详解Spring Boot实战之Rest接口开发及数据库基本操作

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

org.springframework.boot

spring-boot-starter-data-jpa

mysql

mysql-connector-java

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 findUserInfoById(int id);

List findUserInfoByRole(String role);

@Query(value = "select * from t_user limit ?1", nativeQuery =true)

List 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.UserBsfUKBlInfo;

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 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

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

updateuser接口

getuser接口

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_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 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 findAllUsersByCount(int count);

11、在方法名中添加查询字符串参考

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

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