作为一名开发人员，我们经常需要对数据库中的数据进行增删改查（CRUD）操作。在本篇博客中，我们将重点介绍Lauiyi这个优秀的库是如何帮助我们简化和优化这些操作的。
Lauiyi是一个强大的开源工具，提供了丰富的函数和方法，可以轻松地实现对数据库的增删改查操作。下面让我们逐一介绍一下这些功能。
增加（Create）
在Lauiyi中，增加数据非常简单。我们只需使用add()或insert()函数，指定要添加的数据和目标表名，即可将数据插入到数据库中。例如：
python
from lauiyi import Lauiyi
创建Lauiyi对象
1.后台准备
1.dao方法
package com.zking.dao;
import java.util.List;
import java.util.Map;
import com.zking.entity.User;
import com.zking.util.BaseDao;
import com.zking.util.PageBean;
import com.zking.util.StringUtils;
public class UserDao extends BaseDao<User> {
public List<User> executeQuery(Class<User> clz, PageBean pageBean) throws Exception {
String sql="select * from t_oa_user where 1=1 ";
return super.executeQuery(sql, User.class, pageBean);
}
public User login(User user) throws Exception {
String sql="select * from t_oa_user where loginName ='"+user.getLoginName()+"' and pwd = '"+user.getPwd()+"'";
List<User> list = super.executeQuery(sql, User.class, null);
if (list!=null&&list.size()==1) {
return list.get(0);
}
return null;
}
public int registered(User user) throws Exception {
String sql = "insert into t_oa_user(name,loginName,pwd,rid) values(?,?,?,?)";
return executeUpdate(sql, user,new String[] {"name","loginName","pwd","rid"});
}
public List<Map<String, Object>> userRole(User user, PageBean pageBean) throws Exception {
String sql="SELECT\r\n" +
" u.*,\r\n" +
" (\r\n" +
"CASE\r\n" +
" \r\n" +
" WHEN u.rid = '1' THEN\r\n" +
" '管理员' \r\n" +
" WHEN u.rid = '2' THEN\r\n" +
" '发起者' \r\n" +
" WHEN u.rid = '3' THEN\r\n" +
" '审批者' \r\n" +
" WHEN u.rid = '4' THEN\r\n" +
" '参与者' \r\n" +
" WHEN u.rid = '5' THEN\r\n" +
" '会议管理员' ELSE '其它' \r\n" +
"END \r\n" +
" ) rname \r\n" +
"FROM\r\n" +
" `t_oa_user` u where 1=1 ";
String name=user.getName();
if (StringUtils.isNotBlank(name)) {
sql+=" and name like '%"+name+"%'";
}
return super.executeQuery(sql, pageBean);
}
public int add(User user) throws Exception {
String sql="insert into t_oa_user(name,loginName,pwd) values(?,?,?)";
return super.executeUpdate(sql, user, new String[]{"name","loginName","pwd"});
}
public int del(User user) throws Exception {
String sql="delete from where id = ?";
return super.executeUpdate(sql, user, new String[]{"id"});
}
public int edit(User user) throws Exception {
String sql="update t_oa_user set name = ?,loginName=?,pwd=? where id=?";
return super.executeUpdate(sql, user, new String[]{"name","loginName","pwd" ,"id"});
}
public static void main(String[] args) throws Exception {
User user = new User();
// user.setLoginName("ll");
user.setName("朱");
// user.setPwd("789");
// int add = new UserDao().add(user);
//
List<Map<String, Object>> userRole = new UserDao().userRole(user, null);
System.out.println(userRole);
}
}
2.子实现类
package com.zking.web;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.zking.dao.UserDao;
import com.zking.entity.User;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
import com.zking.util.PageBean;
import com.zking.util.R;
import com.zking.util.ResponseUtil;
public class Useraction extends ActionSupport implements ModelDriver<User> {
private User user=new User();
private UserDao userdao=new UserDao();
public void login(HttpServletRequest req, HttpServletResponse resp) {
try {
User u = userdao.login(user);
ResponseUtil.writeJson(resp, u);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void registered(HttpServletRequest req, HttpServletResponse resp) {
try {
int n = userdao.registered(user);
if(n>0) {
ResponseUtil.writeJson(resp, n);
}
ResponseUtil.writeJson(resp, null);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void userRole(HttpServletRequest req, HttpServletResponse resp) {
try {
PageBean pagebean=new PageBean();
pagebean.setRequest(req);
List<Map<String, Object>> userRole = userdao.userRole(user, pagebean);
Map<String, Object>map=new HashMap<String, Object>();
ResponseUtil.writeJson(resp, R.ok(0, "查询成功", pagebean.getTotal(),userRole) );
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void add(HttpServletRequest req, HttpServletResponse resp) throws Exception {
int add = userdao.add(user);
ResponseUtil.writeJson(resp, R.ok(0, "新增成功") );
}
public void del(HttpServletRequest req, HttpServletResponse resp) throws Exception {
int del = userdao.del(user);
ResponseUtil.writeJson(resp, R.ok(0, "删除成功") );
}
public void edit(HttpServletRequest req, HttpServletResponse resp) throws Exception {
int edit = userdao.edit(user);
ResponseUtil.writeJson(resp, R.ok(0, "修改成功") );
}
@Override
public User getModel() {
// TODO Auto-generated method stub
return user;
}
}
2.R工具类的使用
package com.zking.util;
import java.util.HashMap;
public class R extends HashMap{
public R data(String key, Object value) {
this.put(key, value);
return this;
}
public static R ok(int code, String msg) {
R r = new R();
r.data("success", true).data("code", code).data("msg", msg);
return r;
}
public static R error(int code, String msg) {
R r = new R();
r.data("success", false).data("code", code).data("msg", msg);
return r;
}
public static R ok(int code, String msg,Object data) {
R r = new R();
r.data("success", true).data("code", code).data("msg", msg).data("data", data);
return r;
}
public static R ok(int code, String msg, long count, Object data) {
R r = new R();
r.data("success", true).data("code", code).data("msg", msg).data("count", count).data("data", data);
return r;
}
}
3.查询前端代码实现
前端页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ include file = "common/header.jsp" %>
<!DOCTYPE html >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<style type="text/css">
.layui-show{
height:100%;
}
.layui-tab,
.layui-tab-content{
height:100%;
}
</style>
<div class="layui-layout layui-layout-admin">
<div class="layui-header">
<div class="layui-logo layui-hide-xs layui-bg-black">layout demo</div>
<!-- 头部区域（可配合layui 已
有的水平导航） -->
<ul class="layui-nav layui-layout-left">
</ul>
<!-- 个人头像及账号操作 -->
<ul class="layui-nav layui-layout-right">
<li class="layui-nav-item layui-hide layui-show-md-inline-block">
<a href="javascript:;">
<img src="//tva1.sinaimg.cn/crop.0.0.118.118.180/5db11ff4gw1e77d3nqrv8j203b03cweg.jpg" class="layui-nav-img">
tester
</a>
<dl class="layui-nav-child">
<dd><a href="">Your Profile</a></dd>
<dd><a href="">Settings</a></dd>
<dd><a href="login.jsp">Sign out</a></dd>
</dl>
</li>
<li class="layui-nav-item" lay-header-event="menuRight" lay-unselect>
<a href="javascript:;">
<i class="layui-icon layui-icon-more-vertical"></i>
</a>
</li>
</ul>
</div>
<div class="layui-side layui-bg-black">
<div class="layui-side-scroll">
<!-- 左侧导航区域（可配合layui已有的垂直导航） -->
<ul id="menu" class="layui-nav layui-nav-tree" lay-filter="menu">
</ul>
</div>
</div>
<div class="layui-body">
<!-- 内容主体区域 -->
<div style="padding: 15px;">
<div class="layui-tab" lay-filter="demo" lay-allowclose="true">
<ul class="layui-tab-title">
<li class="layui-this" lay-id="11">网站设置</li>
<li lay-id="22">用户管理</li>
<li lay-id="33">权限分配</li>
<li lay-id="44">商品管理</li>
<li lay-id="55">订单管理</li>
</ul>
<div class="layui-tab-content" style=" height:600px" >
<div class="layui-tab-item layui-show">内容1</div>
<div class="layui-tab-item">内容2</div>
<div class="layui-tab-item">内容3</div>
<div class="layui-tab-item">内容4</div>
<div class="layui-tab-item">内容5</div>
</div>
</div>
</div>
</div>
<div class="layui-footer">
<!-- 底部固定区域 -->
底部固定区域
</div>
</div>
<script src="static/index.js" >
</script>
</body>
</html>
4.增删改实现
1.弹出层
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>博客的编辑界面</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/blog.action?methodName=${empty b ? 'add' : 'edit'}" method="post">
id:<input type="text" name="id" value="${b.id }"><br>
title:<input type="text" name="title" value="${b.title }"><br>
keyWord:<input type="text" name="keyWord" value="${b.keyWord }"><br>
<input type="submit">
</form>
</body>
</html>
2.浮层
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@include file="/common/header.jsp" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<%-- <script type="text/javascript" src="${pageContext.request.contextPath }/static/js/system/userEdit.js"></script>
--%><title>用户新增</title>
</head>
<style>
.layui-form-select dl{
max-height:150px;
}
</style>
<body>
<div style="padding:10px;">
<form class="layui-form layui-form-pane" lay-filter="user">
<input type="hidden" name="id"/>
<div class="layui-form-item">
<label class="layui-form-label">用户名称</label>
<div class="layui-input-block">
<input type="text" id="name" name="name" autocomplete="off" placeholder="请输入用户名" class="layui-input">
</div>
</div>
<div class="layui-form-item">
<label class="layui-form-label">用户角色</label>
<div class="layui-input-block">
<select name="rid">
<option value="">---请选择---</option>
<option value="1">管理员</option>
<option value="2">发起者</option>
<option value="3">审批者</option>
<option value="4">参与者</option>
<option value="5">会议管理员</option>
</select>
</div>
</div>
<div class="layui-form-item">
<label class="layui-form-label">登录账号</label>
<div class="layui-input-block">
<input type="text" name="loginName" lay-verify="required" placeholder="请输入账号" autocomplete="off" class="layui-input">
</div>
</div>
<div class="layui-form-item">
<label class="layui-form-label">登录密码</label>
<div class="layui-input-block">
<input type="password" name="pwd" placeholder="请输入密码" autocomplete="off" class="layui-input">
</div>
</div>
</form>
</div>
</body>
</html>
3分离的js代码
1.userManage.js
var table,$;
var row;
layui.use(['table','jquery','layer'], function(){
table = layui.table
layer=layui.layer
,$=layui.jquery;
initTable();
$("#btn_search").click(
function(){
query();
});
$("#btn_add").click(
function(){
row=null;
edit('新增');
}
);
});
function edit(title){
layer.open({
type: 2, //layer提供了5种层类型。可传入的值有：0（信息框，默认）1（页面层）2（iframe层）3（加载层）4（tips层）
title:title,
area: ['660px', '340px'], //宽高
skin: 'layui-layer-rim', //样式类名
content: 'jsp/system/userEdit.jsp', //书本编辑页面
btn:['保存','关闭'],
yes: function(index, layero){
//调用子页面中提供的getData方法，快速获取子页面的form表单数据
let data= $(layero).find("iframe")[0].contentWindow.getData();
console.log(data);
//判断title标题
let methodName="add";
if(title=="编辑")
methodName="edit";
$.post('user.action?methodName='+methodName,
data,function(rs){
if(rs.success){
//关闭对话框
layer.closeAll();
//调用查询方法刷新数据
query();
}else{
layer.msg(rs.msg,function(){});
}
},'json');
},
btn2: function(index, layero){
layer.closeAll();
}
});
}
function query(){
table.reload('test', {
where: { //设定异步数据接口的额外参数，任意设
name: $("#name").val()
}
,page: {
curr: 1 //重新从第 1 页开始
}
}); //只重载数
};
function initTable(){
table.render({
elem: '#test'
,url:'user.action?methodName=userRole'
,toolbar: '#toolbarDemo' //开启头部工具栏，并为其绑定左侧模板
,defaultToolbar: ['filter', 'exports', 'print', { //自定义头部工具栏右侧图标。如无需自定义，去除该参数即可
title: '提示'
,layEvent: 'LAYTABLE_TIPS'
,icon: 'layui-icon-tips'
}]
,title: '用户数据表'
,cols: [[
{type: 'checkbox', fixed: 'left'}
,{field:'id', title:'ID', width:80, fixed: 'left', unresize: true, sort: true}
,{field:'loginName', title:'账户名', width:120, edit: 'text'}
,{field:'name', title:'用户名', width:150, edit: 'text', templet: function(res){
return '<em>'+ res.name +'</em>'
}}
,{field:'pwd', title:'密码', width:80, edit: 'text', sort: true}
,{field:'rname', title:'角色名', width:100}
,{field:'right', title:'签名'}
]]
,page: true
});
//头工具栏事件
//监听行工具事件
table.on('tool(test)', function(obj){
var row = obj.data;
//console.log(obj)
if(obj.event === 'del'){
layer.confirm('确认删除吗?', {icon: 3, title:'提示'}, function(index){
$.post('user.action',{
'methodName':'del',
'id':row.id
},function(rs){
if(rs.success){
//调用查询方法刷新数据
query();
}else{
layer.msg(rs.msg,function(){});
}
},'json');
layer.close(index);
});
} else if(obj.event === 'edit'){
edit("编辑");
}
});
}
2.userEdit.js
let layer,form,$;
layui.use(['layer','form','jquery'],function(){
layer=layui.layer,form=layui.form,$=layui.jquery;
initData();
});
function initData(){
console.log(parent.row);
if(null!=parent.row){
//因为layui.each内部的逻辑问题导致的所以要先深拷贝一份然后再去val
//parent.row：表格行对象
form.val('user',$.extend({}, parent.row||{}));
$('#name').attr('readonly','readonly');
}
}
function getData(){
return form.val('user');
}
3.index.js
var element,layer,util,$;
layui.use(['element', 'layer', 'util'], function(){
element = layui.element
,layer = layui.layer
,util = layui.util
,$ = layui.$
$.ajax({
url:"{pageContext.request.contextPath}/permisson.action?methodName=menus",
dataType:'json',
success:function(data){
console.log(data);
var htmlStr ='';
$.each(data,function(i,n){
htmlStr+='<li class="layui-nav-item layui-nav-itemed">';
htmlStr+='<a class="" href="javascript:;">'+n.text+'</a>';
if (n.hasChildren) {
var children=n.children;
htmlStr+=' <dl class="layui-nav-child">';
$.each(children,function(idx,node){
htmlStr+=' <dd><a href="javascript:;" onclick="openTab(\''+node.text+'\',\''+node.attributes.self.url+'\',\''+node.id +'\')">'+node.text+'</a></dd>';
console.log(node.text);
});
htmlStr+=' </dl>';
}
htmlStr+='</li>';
console.log(n.text);
});
$("#menu").html(htmlStr);
element.render('menu');
}
});
});
/**
*
*/
function openTab(title,content,id) {
var $node=$('li[lay-id="'+id+'"]')
console.log($node);
if ($node.length==0) {
element.tabAdd('demo', {
title: title
,content: "<iframe frameborder='0' src='"+content+"' scrolling='auto' style='width:100%;height:100%;'></iframe>"
,id: id //实际使用一般是规定好的id，这里以时间戳模拟下
})
}
}
5.运行效果
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文章来源地址https://www.toymoban.com/news/detail-562770.html
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