1.html文件：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="Cache-Control" content="no-cache">
<title>PHP连接数据库实现增删改查</title>
</head>
<body>
<div>
<input type="text" name="daiHao" placeholder="代号">
<input type="text" name="keMu" placeholder="科目">
<input type="text" name="jieShu" placeholder="节数">
<button class="tianJia">添加</button>
<button class="shanChu">删除</button>
<button class="xiuGai">修改</button>
<button class="chaZhao">查找</button>
</div>
<p>提示：添加可以填3个，删除只填代号，修改可以填科目和节数然后需要改哪个填代号，查询填科目和节数。</p>
<table>
<tbody>
<!-- <tr>
<th>代号</th>
<th>科目</th>
<th>节数</th>
</tr> -->
</tbody>
</table>
<script src="https://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script>
<script>
function teVal(){
daiHao = $('[name="daiHao"]').val();
keMu = $('[name="keMu"]').val();
jieShu = $('[name="jieShu"]').val();
arr = '<tr><th>代号</th><th>科目</th><th>节数</th></tr>';
}
$.post('1.php',{a: 'synr'},function(ret){
teVal();
// console.log(ret);
if(ret[0].code == '200'){
// alert(ret[0].msg);
for(var i = 1;i < ret.length;i++){
arr += '<tr><td>'+ret[i].c_id+'</td><td>'+ret[i].c_name+'</td><td>'+ret[i].t_id+'</td></tr>';
}
$('tbody').html(arr);
}else{
alert(ret[0].msg);
}
})
//添加
$('.tianJia').on('click',function(){
teVal();
if(keMu == '' && jieShu == ''){
alert('请输入你要添加的内容！');
}else if(daiHao == ''){
alert('请输入你要添加的内容！');
}else{
$.post('1.php',{a: 'tianJia',c_id: daiHao,c_name: keMu,t_id: jieShu},function(ret){
// console.log(ret);
if(ret.code == '200'){
alert(ret.msg);
location.reload();
}else{
alert(ret.msg);
}
})
}
})
//删除
$('.shanChu').on('click',function(){
teVal();
if(daiHao != ''){
var res = confirm('是否删除？');
if(res){
$.post('1.php',{a: 'shanChu',c_id: daiHao},function(ret){
if(ret.code == '200'){
alert(ret.msg);
location.reload();
}else{
alert(ret.msg);
}
})
}
}else{
alert('请输入你要删除的代号！');
}
})
//修改
$('.xiuGai').on('click',function(){
teVal();
if(keMu != '' || jieShu != ''){
var res = confirm('是否修改？');
if(res){
$.post('1.php',{a: 'xiuGai',c_id: daiHao,c_name: keMu,t_id: jieShu},function(ret){
// console.log(ret);
if(ret.code == '200'){
alert(ret.msg);
location.reload();
}else{
alert(ret.msg);
}
})
}
}else{
alert('请输入你要修改的内容！');
}
})
//查找
$('.chaZhao').on('click',function(){
teVal();
if(keMu != '' || jieShu != ''){
$.post('1.php',{a: 'chaZhao',c_id: daiHao,c_name: keMu,t_id: jieShu},function(ret){
// console.log(ret)
if(ret[0].code == '200'){
// alert(ret[0].msg);
for(var i = 1;i < ret.length;i++){
arr += '<tr><td>'+ret[i].c_id+'</td><td>'+ret[i].c_name+'</td><td>'+ret[i].t_id+'</td></tr>';
}
$('tbody').html(arr);
}else{
alert(ret[0].msg);
}
})
}
})
</script>
</body>
</html>
1.php文件：
<?php
$conn = mysqli_connect('localhost','cs','123456','cs','3306');//主机名或 IP 地址，MySQL用户名，MySQL密码，规定默认使用的数据库，MySQL服务器的端口号，规定 socket 或要使用的已命名 pipe
if (!$conn) {
die("连接错误: " . mysqli_connect_error());
}
// var_dump($conn);
mysqli_query($conn,"set names utf8");//设置数据库编码为utf8
header('content-type: application/json;charset=utf-8');//输出为json格式，并设置编码为utf-8
//全局
$c_id = isset($_POST['c_id']) ? trim($_POST['c_id']) : '';
$c_name = isset($_POST['c_name']) ? trim($_POST['c_name']) : '';
$t_id = isset($_POST['t_id']) ? trim($_POST['t_id']) : '';
//添加
function tianJia(){
$conn = $GLOBALS['conn'];//引用全局作用域中可用的全部变量
$c_id = $GLOBALS['c_id'];
$c_name = $GLOBALS['c_name'];
$t_id = $GLOBALS['t_id'];
$sql = "insert into course (c_id,c_name,t_id) values ('$c_id','$c_name','$t_id')";//添加
$result = mysqli_query($conn,$sql);
if($result){
return json_encode(array('code' => '200','msg' => '添加成功'));
}else{
return json_encode(array('code' => '400','msg' => '添加失败'));
}
}
//删除
function shanChu(){
$conn = $GLOBALS['conn'];
$c_id = $GLOBALS['c_id'];
$sql = "delete from course where c_id='$c_id'";//删除
$result = mysqli_query($conn,$sql);
if($result){
return json_encode(array('code' => '200','msg' => '删除成功'));
}else{
return json_encode(array('code' => '400','msg' => '删除失败'));
}
}
//修改
function xiuGai(){
$conn = $GLOBALS['conn'];
$c_id = $GLOBALS['c_id'];
$c_name = $GLOBALS['c_name'];
$t_id = $GLOBALS['t_id'];
if($c_name != ''){
$s = "c_name='$c_name'";
}else if($t_id != ''){
$s = "t_id='$t_id'";
}else if($c_name != '' && $t_id != ''){
$s = "c_name='$c_name',t_id='$t_id'";
}
$sql = "update course set $s where c_id='$c_id'";//修改
$result = mysqli_query($conn,$sql);
if($result){
return json_encode(array('code' => '200','msg' => '修改成功'));
}else{
return json_encode(array('code' => '400','msg' => '修改失败'));
}
}
//查找
function chaZhao(){
$conn = $GLOBALS['conn'];
$c_id = $GLOBALS['c_id'];
$c_name = $GLOBALS['c_name'];
$t_id = $GLOBALS['t_id'];
if($c_name != ''){
$s = "c_name='$c_name'";
}else if($t_id != ''){
$s = "t_id='$t_id'";
}else if($c_name != '' && $t_id != ''){
$s = "c_name='$c_name' and t_id='$t_id'";
}
$sql = "select * from course where $s";//查找
$result = mysqli_query($conn,$sql);
$arr = array();//建一个空数组
$arr[] = array('code' => '200','msg' => '查找成功');//赋值到空数组里
while ($row = mysqli_fetch_assoc($result)) {//通过while循环获取
$arr[] = $row;
}
if($result){
return json_encode($arr);
}else{
return json_encode(array('code' => '400','msg' => '查找失败'));
}
}
//所有内容
function synr(){
$conn = $GLOBALS['conn'];
$sql = 'select * from course';
$result = mysqli_query($conn,$sql);
$arr = array();
$arr[] = array('code' => '200','msg' => '获取成功');
while ($row = mysqli_fetch_assoc($result)) {//通过while循环获取
$arr[] = $row;
}
// print_r($arr);
if($result){
return json_encode($arr);
}else{
return json_encode(array('code' => '400','msg' => '获取失败'));
}
}
//转换成数组
// $result = mysqli_query($conn,$sql);//对数据库执行一次查询
// $row = mysqli_fetch_array($result,MYSQLI_ASSOC);//函数从结果集中取得一行作为关联数组，或数字数组。 MYSQLI_ASSOC,MYSQLI_NUM,MYSQLI_BOTH（默认）
// print_r($row);
//mysqli_fetch_assoc($result);//关联数组
//mysqli_fetch_row($result);//数字数组
//错误提示
function bc(){
return json_encode(array('code' => '400', 'msg' => '操作失败'));
}
$a = isset($_POST['a']) ? trim($_POST['a']) : '';
switch ($a){
case "tianJia": // 添加
echo tianJia();
break;
case "shanChu": // 删除
echo shanChu();
break;
case "xiuGai": // 修改
echo xiuGai();
break;
case "chaZhao": // 查找
echo chaZhao();
break;
case "synr":
echo synr();
break;
default:
echo bc();
mysqli_close($conn);//关闭先前打开的数据库连接
}
?>
