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

<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

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_, 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

本文源码下载：springrest.rar

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://blog.csdn.net/sun_t89/article/details/51912905