springboot结合vue实现增删改查及分页查询的操作方法

springboot结合vue实现增删改查及分页查询的操作方法，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。

1：首先。创建一个springboot项目，这里我使用以及构建好基本框架的脚手架，打开是这个样子：

Result类：已经封装好了三种返回类型的包装类：code，msg，data

2：创建数据库叫mytest(可以自己取名字)

CREATE TABLE `user` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '序号',
  `name` varchar(20) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '姓名·',
  `age` int(11) DEFAULT NULL COMMENT '年龄',
  `sex` varchar(1) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '性别',
  `adderss` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '地址',
  `phone` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '电话',
  `creat_time` varchar(20) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

3：编写实体类：entity->User类

**首先加@Table注解告诉我们要哪个表，然后加@Entity标注这个User是一个entity，@Data生成getset方法
**

package com.example.entity;

import lombok.Data;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Table;

@Table(name="user")
@Entity
@Data
public class User {
    private  Long id;
    private  String name;
    private  Integer age;
    private  String sex;
    private  String adderss;
    private  String phone;
    @Column(name = "creat_time")    
    private  String creatTime;

}

这里可以自己添加get和set方法，我这里是直接在pom里面添加了lombok注解

  <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

这里user报错不要怕 在下面加上

@Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)  //表示ID是主见并且自动递增

4：编写UserDao层：写数据库接口

package com.example.dao;

import com.example.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;


@Repository
public interface UserDao extends JpaRepository<User,Long> {
}

5：编写service层，编写增删改查方法（使用了springdataJPA）

package com.example.service;

import com.example.dao.UserDao;
import com.example.entity.User;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Optional;

@Service
public class UserService {

    //1:导入数据库接口  (JPA帮助我们编写了大量的接口，我们只需要调用就好)
    @Resource
    private UserDao userDao;

//   这两个方法合并成了一个，因为都是调用的save,区别就是新增的时候不会传ID进来，更新的时候会,框架会帮我们区分
//    // 增加
//    public void add(User user){
//        userDao.save(user);
//    }
//
//    //修改
//    public  void  updata(User user){
//        userDao.save(user);
//
    //新增+修改
    public void save(User user){
            userDao.save(user);
        }


    

    //删除
    public  void  del(Long id){
    userDao.deleteById(id);

    }

    //查找
    public User findById(Long id){
        return userDao.findById(id).orElse(null);  //没有数据则返回null

    }

    //分页查询
    public Page<User> findPage(Integer pageNum, Integer pageSize,String name){
        Sort sort = Sort.by(Sort.Direction.DESC,"creat_time");
        Pageable request = PageRequest.of(pageNum-1,pageSize,sort);
        return userDao.findNameLike(name,request);
    }
}

中途需要在UserDao层编写分页查询语句

package com.example.dao;

import com.example.entity.User;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;


@Repository
public interface UserDao extends JpaRepository<User,Long> {
    @Query(value = "select * from  user where  name like %?1%",nativeQuery = true)
    Page<User> findNameLike(String name, Pageable pageRequest);
}

6：编写UserController作为接口访问层

package com.example.controller;

import com.example.common.Result;
import com.example.entity.User;
import com.example.service.UserService;
import org.springframework.data.domain.Page;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;

/**
 * @author ${范涛之}
 * @Description
 * @create 2021-09-20 12:19
 */
@RestController     //表明所有方法都是返回json数据
@RequestMapping("/user")
public class UserController {

    @Resource
    private UserService userService;

    // 新增
    @PostMapping
    public Result add(@RequestBody User user){
        userService.save(user);
        return  Result.success();
    }

    //更新
    @PutMapping
    public Result update(@RequestBody User user){
        userService.save(user);
        return  Result.success();
    }


    //删除用户 ： /user/1
    @DeleteMapping("/{id}")
    public Result delete(@PathVariable Long id){
        userService.del(id);
        return  Result.success();
    }

    //根据id查询用户
    @GetMapping("/{id}")
    public Result<User> findById(@PathVariable Long id){
        return  Result.success( userService.findById(id));
    }


    //分页查询

    @GetMapping
    public Result<Page<User>> findById(@RequestParam(required = false,value ="1" )Integer pageNum,
                                 @RequestParam(required = false,value ="10" )Integer PageSize,
                                 @PathVariable(required = false) String name){
        return  Result.success( userService.findPage(pageNum,PageSize,name));
    }
}

7：编写前端界面，在static里面写index.html，测试运行

8：通过使用elementui引入样式

9：编写index.html文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>用户信息</title>
    <!-- 引入样式 -->
    <link rel="stylesheet" href="element.css">
</head>
<body>
<div id="app" >
    <h3>用户信息表</h3>

    <el-row>
        <el-col :span="6" >
            <el-button type="primary" @click="add">新增</el-button>
            <el-input v-model="name"  @keyup.enter.native="loadTable(1)"></el-input>
        </el-col>
    </el-row>

    <el-table
            :data="page.content"
            stripe
            border
            >
        <el-table-column
                prop="name"
                label="用户名"
        >
        </el-table-column>
        <el-table-column
                prop="age"
                label="年龄"
                width="180">
        </el-table-column>
        <el-table-column
                prop="sex"
                label="性别">
        </el-table-column>
        <el-table-column
                prop="address"
                label="地址">
        </el-table-column>
        <el-table-column
                prop="phone"
                label="电话">
        </el-table-column>
        <el-table-column
                fixed="right"
                label="操作"
                width="100">
            <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="small" circle @click="edit(scope.row)"></el-button>
                <el-button type="danger" icon="el-icon-delete" size="small" circle @click="del(scope.row.id)"></el-button>
            </template>
        </el-table-column>
    </el-table>
    <el-row type="flex" justify="center" >
        <el-pagination
                layout="prev, pager, next"
                :page-size="pageSize"
                :current-page="pageNum"
                @prev-click="loadTable"
                @current-change="loadTable"
                @next-click="loadTable"
                :total="page.totalElements">
        </el-pagination>
    </el-row>

    <el-dialog
            title="用户信息"
            :visible.sync="dialogVisible"
            width="30%">
        <el-form ref="form" :model="form" label-width="80px">
            <el-form-item label="用户名">
                <el-input v-model="form.name"></el-input>
            </el-form-item>
            <el-form-item label="年龄">
                <el-input v-model="form.age"></el-input>
            </el-form-item>
            <el-form-item label="性别">
                <el-radio v-model="form.sex" label="男">男</el-radio>
                <el-radio v-model="form.sex" label="女">女</el-radio>
            </el-form-item>
            <el-form-item label="地址">
                <el-input v-model="form.address"></el-input>
            </el-form-item>
            <el-form-item label="电话">
                <el-input v-model="form.phone"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="dialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="save">确 定</el-button>
        </span>
    </el-dialog>

</div>

<script src="jquery.min.js"></script>
<script src="vue.js"></script>
<!-- 引入组件库 -->
<script src="element.js"></script>

<script>
    new Vue({
        el: '#app',
        data: {
            page: {},
            name: '',
            pageNum: 1,
            pageSize: 8,
            dialogVisible: false,
            form: {}
        },
        created() {
            this.loadTable(this.pageNum);
        },
        methods: {
            loadTable(num) {
                this.pageNum = num;
                $.get("/user/page?pageNum=" + this.pageNum + "&pageSize=" + this.pageSize + "&name=" + this.name).then(res => {
                    this.page = res.data;
                });
            },
            add() {
                this.dialogVisible = true;
                this.form = {};
            },
            edit(row) {
                this.form = row;
                this.dialogVisible = true;
            },
            save() {
                let data = JSON.stringify(this.form);
                if (this.form.id) {
                    // 编辑
                    $.ajax({
                        url: '/user',
                        type: 'put',
                        contentType: 'application/json',
                        data: data
                    }).then(res => {
                        this.dialogVisible = false;
                        this.loadTable(1);
                    })
                } else {
                    // 新增
                    $.ajax({
                        url: '/user',
                        type: 'post',
                        contentType: 'application/json',
                        data: data
                    }).then(res => {
                        this.dialogVisible = false;
                        this.loadTable(1);
                    })
                }
            },
            del(id) {
                $.ajax({
                    url: '/user/' + id,
                    type: 'delete',
                    contentType: 'application/json'
                }).then(res => {
                    this.loadTable(1);
                })
            }
        }
    })
</script>
</body>
</html>

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