Spring_Boot_mybatis plus连接数据库实现增删查改

实体类

EmpAttr

package cn.ps.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;


@TableName("emp_t")
public class EmpAttr {
	@TableId(type=IdType.AUTO)
	private String empno;
	@TableField("ename")
	private String ename;
	private String sal;
	private String job;
	private String email;
	private String phone;

	public String getEmpno() {
		return empno;
	}

	public void setEmpno(String empno) {
		this.empno = empno;
	}

	public String getEname() {
		return ename;
	}

	public void setEname(String ename) {
		this.ename = ename;
	}

	public String getSal() {
		return sal;
	}

	public void setSal(String sal) {
		this.sal = sal;
	}

	public String getJob() {
		return job;
	}

	public void setJob(String job) {
		this.job = job;
	}

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	public String getPhone() {
		return phone;
	}

	public void setPhone(String phone) {
		this.phone = phone;
	}
}

``

分页配置(一般放到实体层)

Result

package cn.ps.entity;


import java.util.List;


public class Result {
    private  int code;
    private String msg;
    private int count;
    private List data;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }

    public List getData() {
        return data;
    }

    public void setData(List data) {
        this.data = data;
    }
}

控制层 (controller)

EmpController.java

package cn.ps.controller;


import cn.ps.entity.EmpAttr;
import cn.ps.entity.Result;
import cn.ps.service.EmpService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;



@RestController
public class EmpController {

	@Autowired
	private EmpService service;
	

	/**
	 * 多条件搜索
	 * listEmp?ename=a&curPage=1&pageNum=2
	 * @param ename
	 * @param page
	 * @param limit
	 */

	@GetMapping(value = "/queryEmp")
	public Result listEmp(String sal,String ename, String page, String limit) throws Exception {
		try {
			Result pb=service.queryEmp(sal,ename,page,limit);
			return pb;
		} catch (Exception e) {			
			e.printStackTrace();
		}
		return null;
	}


	@PostMapping(value = "adEmp")
	public Result addEmp(EmpAttr empAttr) throws Exception {
		Result rt=new Result();
		try{
			service.addEmp(empAttr);
		}catch(Exception e){
			rt.setCode(1);
			rt.setMsg("新增出错"+e.getMessage());
		}
		return rt;
	}


	@DeleteMapping(value = "adEmp/{empno}")
	public Result addEmp(@PathVariable String empno) throws Exception {
		Result rt=new Result();
		try{
			service.deleteEmp(empno);
		}catch(Exception e){
			rt.setCode(1);
			rt.setMsg("删除出错"+e.getMessage());
		}
		return rt;
	}


	@PutMapping(value = "adEmp/{empno}")
	public Result addEmp(@PathVariable String empno, @Valid EmpAttr empAttr ) throws Exception {
		Result rt=new Result();
		empAttr.setEmpno(empno);
		try{
			service.updateEmp(empAttr);
		}catch(Exception e){
			rt.setCode(1);
			rt.setMsg("修改出错"+e.getMessage());
		}
		return rt;
	}
}

服务层

实现类EmpServiceImpl.java

package cn.ps.service.imp;

import java.sql.SQLException;
import java.util.List;
import cn.ps.entity.EmpAttr;

import cn.ps.entity.Result;
import cn.ps.mapper.EmpMapper;

import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;

import cn.ps.service.EmpService;


@Service
public class EmpServiceImpl implements EmpService{
	
	@Autowired
	private EmpMapper empMapper;
	
	public Result queryEmp(String sal,String ename, String curPage, String pageNum ) throws SQLException{
		//第一次访问 没有当前页
		if(StringUtils.isEmpty(curPage)) {
			curPage="1";
		}
		if(StringUtils.isEmpty(pageNum)) {
			pageNum="10";
		}
		if(StringUtils.isEmpty(ename)) {
			ename="";
		}
		if(StringUtils.isEmpty(sal)) {
			sal="";
		}
		
		//转换成int类型
		int curPageIn=Integer.parseInt(curPage);
		int pageNumIn=Integer.parseInt(pageNum);
		QueryWrapper<EmpAttr> qw=new QueryWrapper<>();
		qw.like("ename", ename);
		qw.like("sal", sal);
		IPage<EmpAttr> pageData=empMapper.selectPage(new Page(curPageIn,pageNumIn), qw);
		//ListqueryEmp=empMapper.queryEmp("%"+ename+"%", curPageIn, pageNumIn);
		/*PageInfo pi=new PageInfo(queryEmp);*/
		Result rt=new Result();
		rt.setCode(0);
		rt.setCount((int)pageData.getTotal());
		rt.setData(pageData.getRecords());
		return rt;
	}

	@Override
	public void addEmp(EmpAttr empAttr) {
		empMapper.insert(empAttr);
	}

	@Override
	public void deleteEmp(String empno) {
		empMapper.deleteById(empno);
	}

	@Override
	public void updateEmp(EmpAttr empAttr) {
		empMapper.updateById(empAttr);
	}

接口类
EmpService

package cn.ps.service;

import java.sql.SQLException;


import cn.ps.entity.Result;
import cn.ps.entity.EmpAttr;


public interface EmpService {

	public Result queryEmp(String sal, String ename, String curPage, String pageNum) throws SQLException;

	 void addEmp(EmpAttr empAttr);

	void deleteEmp(String empno);

	void updateEmp(EmpAttr empAttr);
}

自己的写分页器

PagerBean

package cn.ps.utils;

import java.util.List;



public class PagerBean<T> {
	public void calc() {
		
	}
	/**
	 * 
	 * @param curPage 当前页
	 * @param pageNum 每页显示条数
	 * @param total 总条数
	 */
	public PagerBean(int curPage,int pageNum,int total) {
		//计算上一页
		this.prePage=(curPage==1?1:curPage-1);
		//计算总页数
		this.totalPage=(total%pageNum==0?total/pageNum:total/pageNum+1);
		//计算下一页
		this.nextPage=(curPage==totalPage?totalPage:curPage+1);
		//当前页的索引
		this.startIndex=(curPage-1)*pageNum;
		
		this.total=total;
		
		this.curPage=curPage;
		
		this.pageNum=pageNum;
		
	}
	public int getCurPage() {
		return curPage;
	}
	public void setCurPage(int curPage) {
		this.curPage = curPage;
	}
	public int getPageNum() {
		return pageNum;
	}
	public void setPageNum(int pageNum) {
		this.pageNum = pageNum;
	}
	public int getPrePage() {
		return prePage;
	}
	public void setPrePage(int prePage) {
		this.prePage = prePage;
	}
	public int getNextPage() {
		return nextPage;
	}
	public void setNextPage(int nextPage) {
		this.nextPage = nextPage;
	}
	public int getTotal() {
		return total;
	}
	public void setTotal(int total) {
		this.total = total;
	}
	public int getTotalPage() {
		return totalPage;
	}
	public void setTotalPage(int totalPage) {
		this.totalPage = totalPage;
	}
	public List<T> getData() {
		return data;
	}
	public void setData(List<T> data) {
		this.data = data;
	}
	/**
	 * 当前页 查询的默认当前页=1
	 * 当前页传递的参数
	 */
	private int curPage;
	
	
	/**
	 * 每页显示的数据 默认10条
	 * 当前页传递的参数
	 */
	private int pageNum=10;
	
	/**
	 * 根据当前页计算
	 * 上一页
	 * curPage=1 prePage=1
	 * curPage>1 prePage=curPage-1
	 * 2		prePage=2-1=1
	 */
	private int prePage;
	
	/**
	 * 下一页
	 * curPage=totalPage  nextPage=totalPage
	 * curPage
	private int nextPage;
	
	
	
	/**
	 * 总共多少条
	 * 数据库查询
	 */
	private int total;
	
	/**
	 * 总共多少页
	 * 总条数total/每页显示条数pageNum
	 * 20/10=2
	 * total%pageNum==0?total/pageNum:total/pageNum+1
	 */
	private int totalPage;
	
	/**
	 * 开始索引
	 * startIndex=(curPage-1)*pageNum
	 */
	private int startIndex;
	public int getStartIndex() {
		return startIndex;
	}
	public void setStartIndex(int startIndex) {
		this.startIndex = startIndex;
	}
	/**
	 * 装载当前页的数据
	 */
	private List<T> data;
	
}

``

java main方法

用来运行springBoot
EmpMain

package cn.ps;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author huxiong
 * @date $date$ $time$
 * @returm $return$
 */

@RestController
@SpringBootApplication
//@MapperScan("cn.ps.mapper")
public class EmpMain {
    @RequestMapping("/")
    String home() {
        return "Hello World!";
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(EmpMain.class, args);
    }
}

建立个分页配置Bean

ConfigBean类

package cn.ps.conf;

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.github.pagehelper.PageHelper;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import java.util.Properties;


//Spring boot方式
@EnableTransactionManagement
@Configuration
@MapperScan("com.baomidou.cloud.service.*.mapper*")
public class ConfigBean {

    /**
     * 分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
}

html代码

listEmp.html

<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <link rel="stylesheet" href="resource/layui/css/layui.css">
    <script src="resource/layui/layui.js">script>
    <script src="jquery-3.3.1.js">script>
    <script type="text/javascript">

        layui.use('form',function () {
            var form=layui.form;
            form.on('submit(myForm)',function (data) {
                data.field["page"]=1;
                layui.table.reload('myEmpTable', {
                    url: 'queryEmp'
                    ,where: data.field
                });
                return false;
            });
            form.on('submit(addForm)',function (data) {
                $.ajax({
                    url:'adEmp',
                    dataType:'json',
                    data:data.field,
                    type:'post',
                    success:function (da) {
                        if(da.code==0){
                            alert("新增成功");
                            layer.close(addWindow);
                            layui.table.reload('myEmpTable', {
                                url: 'queryEmp'
                            });
                        }else {
                            alert(da.msg);
                        }
                    }
                });
                return false;
            });


            form.on('submit(updateForm)', function(data){
                data.field["_method"]="put";
                $.ajax({
                    url:'adEmp/'+data.field.empno,
                    dataType:'json',
                    type:'post',
                    data:data.field,
                    success:function (da) {
                        if(da.code==0){
                            alert("修改成功");
                            layer.close(addWindow);
                            layui.table.reload('myEmpTable', {
                                url:'queryEmp'
                            });
                        }else{
                            alert(da.msg);
                        }
                    }
                });
                return false;
            });
        });


        layui.use('table', function(){
            var table = layui.table;
        table.render({
            elem: '#myEmpTable'
            ,height: 312
            ,width:'1200'
            ,url: 'queryEmp' //数据接口
            ,page: true //开启分页
            ,cols: [[ //表头
                {field: 'empno', title: '雇员编号', width:100, sort: true, fixed: 'left'}
                ,{field: 'ename', title: '雇员名称', width:150}
                ,{field: 'sal', title: '薪水', width:150, sort: true}
                ,{field: 'job', title: '职位', width:150}
                ,{field: 'email', title: '邮箱', width: 150}
                ,{field: 'phone', title: '手机号码', width: 150, sort: false}
                ,{field: 'dele', title: '操作', width: 210,templet: function(d){

                        return "删除"+
                                "+d.empno+"','"+d.ename+"','"+d.sal+"','"+d.job+"','"+d.email+"','"+d.phone+"')>修改";
                    },}
            ]]
        });
    });

    var addWindow=null;
    function addEmp() {
        layui.use('layer',function (){
            addWindow=layer.open({
                type:1,
                area:['400px','400px'],
                content:$("#addForm")
            });
        });
    }

    function deleteEmp(empno) {
        $.ajax({
            url:'adEmp/'+empno,
            dataType:'json',
            data:{
                "_method":"delete"
            },
            type:'post',
            success:function (da) {
                if(da.code==0){
                    alert("删除成功");
                    layui.table.reload('myEmpTable', {
                        url: 'queryEmp'
                    });
                }else {
                    alert(da.msg);
                }
            }
        });
        return false;
    }



        function  updateEmp(empno,ename,sal,job,email,phone) {
            $("#updateForm input[name=empno]").val(empno);
            $("#updateForm input[name=ename]").val(ename);
            $("#updateForm input[name=sal]").val(sal);
            $("#updateForm input[name=job]").val(job);
            $("#updateForm input[name=email]").val(email);
            $("#updateForm input[name=phone]").val(phone);
            layui.use('layer', function(){
                addWindow=layer.open({
                    type:1,
                    area: ['500px', '400px'],
                    content: $("#updateForm"),
                });
            });
        };

    script>
head>
<body>
    <br/>
    <form class="layui-form" action="">
    <div class="layui-inline">
        <label class="layui-form-label">雇员名称label>
        <div class="layui-input-inline" style="width: 200px;">
            <input type="text" name="ename" placeholder="请输入名称" autocomplete="off" class="layui-input">          
        div>
        <div class="layui-input-inline" style="width: 200px;">         
            <input type="text" name="sal" placeholder="请输入编号" autocomplete="off" class="layui-input">
        div>
        <div class="layui-input-inline" style="width: 200px;">
            <button class="layui-btn" lay-submit lay-filter="myForm">查询button>
            <a href="javascript:addEmp()" class="layui-btn">新增a>
        div>
    div>
    form>

    <table id="myEmpTable" >table>
body>
html>



<form id="addForm" class="layui-form" style="display: none"> 
    <div class="layui-form-item">
        <label class="layui-form-label">雇员名称:label>
        <div class="layui-input-block">
            <input type="text"  name="ename" lay-verify="required" placeholder="请输入雇员名称" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <label class="layui-form-label">薪水:label>
        <div class="layui-input-block">
            <input type="text" name="sal" lay-verify="number" placeholder="请输入薪水" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <label class="layui-form-label">职位:label>
        <div class="layui-input-block">
            <input type="text" name="job" placeholder="请输入职位" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <label class="layui-form-label">邮箱:label>
        <div class="layui-input-block">
            <input type="text" name="email" lay-verify="email" placeholder="请输入邮箱" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <label class="layui-form-label">联系方式:label>
        <div class="layui-input-block">
            <input type="text" name="phone" lay-verify="phone" placeholder="请输入联系方式" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <div class="layui-input-block">
            <button class="layui-btn" lay-submit lay-filter="addForm">立即提交button>
            <button type="reset" class="layui-btn layui-btn-primary">重置button>
        div>
    div>
form>



<form id="updateForm" class="layui-form" style="display: none"> 
    <input type="hidden" name="empno">
    <div class="layui-form-item">
        <label class="layui-form-label">雇员名称:label>
        <div class="layui-input-block">
            <input type="text"  name="ename" lay-verify="required" placeholder="请输入" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <label class="layui-form-label">薪水:label>
        <div class="layui-input-block">
            <input type="text"  name="sal" lay-verify="number" placeholder="请输入" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <label class="layui-form-label">职位:label>
        <div class="layui-input-block">
            <input type="text"  name="job" placeholder="请输入" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <label class="layui-form-label">邮箱:label>
        <div class="layui-input-block">
            <input type="text"  name="email" lay-verify="email" placeholder="请输入" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <label class="layui-form-label">联系方式:label>
        <div class="layui-input-block">
            <input type="text"  name="phone" lay-verify="phone" placeholder="请输入" autocomplete="off" class="layui-input">
        div>
    div>
    <div class="layui-form-item">
        <div class="layui-input-block">
            <button class="layui-btn" lay-submit lay-filter="updateForm">立即提交button>
            <button type="reset" class="layui-btn layui-btn-primary">重置button>
        div>
    div>
form>

datasource文件配置

连接数据库配置

spring.datasource.druid.url=jdbc:mysql://192.168.0.110/mysql
spring.datasource.druid.username=root
spring.datasource.druid.password=123456
spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

jar包

各种包(pom.xml)

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.ps</groupId>
    <artifactId>SpringMybatisPlus</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <uriEncoding>UTF-8</uriEncoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.17.RELEASE</version>
    </parent>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

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

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>

        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.2</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.0.6</version>
        </dependency>

        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>4.1.6</version>
        </dependency>
    </dependencies>

</project>