springboot结合vue实现增删改查及分页查询
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" style="width: 80%; margin: 0 auto"> <h2>用户信息表</h2> <el-row> <el-col :span="6" style="margin-bottom: 10px"> <el-button type="primary" @click="add">新增</el-button> <el-input v-model="name" style="width: 70%" @keyup.enter.native="loadTable(1)"></el-input> </el-col> </el-row> <el-table :data="page.content" stripe border style="width: 100%"> <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" style="margin-top: 10px"> <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>
完结撒花:
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