1.php database connection and basic operation configuration
(1)php creates database [connection] (Related mysql video tutorial recommendation: "mysql tutorial")
语法：Object mysqli_connect("域名","DB账号","DB密码","DB库名")
例子：$con = mysqli_connect('localhost','root','','frankdb');(2) Solution to garbled Chinese characters when inserting data into DB
Syntax:
mysqli_query($con,"set names utf8");
Note: If the setting is successful, 1 will be returned. Depending on the actual situation, it is not necessary to save the returned result.
(3) Set the client and server to keep the character encoding consistent
Syntax:
mysqli_query($con,"set character_set_client=utf8");
mysqli_query($con,"set character_set_results=utf8"); (4) Execute sql statement
语法：$结果 = $DB连接->query(sql语句); 例子：var_dump($result = $con->query($sql));
2. Use basic sql statement [template]
a.Establish connection
b.Determine whether to connect
c.Set encoding
d.Create sql statement
eNumber of execution results
g.Patch results
h.jsonized return
<?php
//a.sql 查询语句
无条件查询，即直接写1即可
//$sql='select * from 哪张表 where 条件'；
有条件查询，在where后面写出查询条件，如果多个条件需要用and 或or 来连接。
//$sql="select stuName from stud where stuScore='100' and stuGender='female'";
//$sql="select stuName from stud where stuScore='100' or stuGender='female'";
$con=mysqli_connect('localhost','root','','studb')
if($con){
echo'<pre class="brush:php;toolbar:false">';
echo'数据库连接成功，等待指令...';
mysqli_query($con,'set names utf8');
mysqli_query($con,'set character_set_client=utf8');
mysqli_query($con,'set character_set_results=utf8');
$sql="select * from stud where 1";
$result=$con->query($sql);
if($result>num_rows>0){
$info=[];
for($i=0;$row=$result->fet_assoc();$i++){
$info[$i]=$row;
}
echo json_encode($info);
}
}else{
echo'<pre class="brush:php;toolbar:false">';
echo'数据连接失败，请重新连接‘；
} b.Insert statement (add statement)
Two ways of writing:
(1)$sql="insert into 表名（字段1，字段2，...) values(值1，值2，...)"; (2)$sql='insert into 表名（'值1’,'值2',...)";
$con=mysqli_connect('localhost','root','','studb');
if($icon){
echo'<pre class="brush:php;toolbar:false">';
echo'数据库连接成功，等待指令...';
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_result=utf8');
$sql="insert into stud stuName,stuGender,stuAge,stuNum,stuScore)values('lucy','female','14','123456789','90')";
$sql="insert into stud values('lucy','female','14','123456789','90')";
$result=$con->query($sql);
if($result){
echo'添加成功';
}else｛
echo'添加失败';
} c. Modify statement (update statement) update
$sql="update 表名 set 字段1=‘新值1’，字段2=‘新值2’，... where 条件“；
$con=mysqli_connect('localhost','root','','studb');
if($con){
echo "<pre class="brush:php;toolbar:false">";
echo "数据库连接成功，等待指令...";
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_results=utf8');
$sql="update stud set stuScore='100' where stuName='lily'";
$result=$con->query($sql);
var_dump($result);
}else{
echo "数据库连接失败！！！";
} d. Delete statement delete
$sql="delete from 表名 where 条件“；
$con=mysqli_connect('localhost','toot','';'studb' );
if($con){
echo "<pre class="brush:php;toolbar:false">";
echo "数据库连接成功，等待指令...";
//
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_results=utf8');
//
$sql = "delete from stud where stuName='lucy'";
$result = $con->query($sql);
var_dump($result);
}else{
echo "数据库连接失败！！！";
}
?>
ajax & php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<span>姓名：</span><input type="text" class="stuName"><br/>
<span>性别：</span><input type="text" class="stuGender"><br/>
<span>年龄：</span><input type="text" class="stuAge"><br/>
<span>手机：</span><input type="text" class="stuNumber"><br/>
<span>分数：</span><input type="text" class="stuScore"><br/>
<button>增：将上述信息添加至数据库</button><br/>
<button>删：根据姓名删除指定的内容</button><br/>
<button>改：根据姓名修改指定的内容</button><br/>
<button>查：查询数据库中所有的内容</button>
<!-- 1.引入jquery框架 -->
<script src="jquery-1.12.3.min.js"></script>
<script>
$('button:eq(0)').click(function(){
//2.在想要和后台交互的时候，调用$.ajax()方法
//参数是JSON格式
$.ajax({
//3.ajax结构需要一系列参数支持
type:'post',//get|post
url:'http://127.0.0.1/day3/code/lesson6_ajax&php/lesson6_ajax&php.php',
dataType:'json',
data:{
//data是post请求独有的，因为post请求才需要携带数据给后台
stuName:$('.stuName').val(),
stuGender:$('.stuGender').val(),
stuAge:$('.stuAge').val(),
stuNumber:$('.stuNumber').val(),
stuScore:$('.stuScore').val(),
},
//请求完成后，若收到后台返回的数据(收到响应response)，这个函数会被自动执行。
success:function(data){
console.log(data);
}
});
});
$('button:eq(1)').click(function(){
});
$('button:eq(2)').click(function(){
});
$('button:eq(3)').click(function(){
});
</script>
</body>
</html>
<?php
/*
1.内置对象
在php中内置了两个对象用来接收，前端发来的信息。
$_GET 和 $_POST
$_GET用于获取在前端通过get请求发来的信息
$_POST用于获取在前端通过post请求发来的信息
*/
echo json_encode($_POST);
?>
ajax select&php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<span>姓名：</span><input type="text" class="stuName"><br/>
<span>性别：</span><input type="text" class="stuGender"><br/>
<span>年龄：</span><input type="text" class="stuAge"><br/>
<span>手机：</span><input type="text" class="stuNumber"><br/>
<span>分数：</span><input type="text" class="stuScore"><br/>
<button>增：将上述信息添加至数据库</button><br/>
<button>删：根据姓名删除指定的内容</button><br/>
<button>改：根据姓名修改指定的内容</button><br/>
<button>查：查询数据库中所有的内容</button>
<script src="jquery-1.12.3.min.js"></script>
<script>
$('button:eq(0)').click(function(){
//判空操作
var stuNameValue = $('.stuName').val();
var stuGenderValue = $('.stuGender').val();
var stuAgeValue = $('.stuAge').val();
var stuNumberValue = $('.stuNumber').val();
var stuScoreValue = $('.stuScore').val();
if(
stuNameValue.length==0||
stuGenderValue.length==0||
stuAgeValue.length==0||
stuNumberValue.length==0||
stuScoreValue.length==0){
alert('任意某一个输入信息都不能为空！');
return;
}
$.ajax({
type:'post',
url:'http://127.0.0.1/day3/code/lesson7_html&php&mysql/lesson7_html&php&mysql.php',
dataType:'json',
data:{
stuName:$('.stuName').val(),
stuGender:$('.stuGender').val(),
stuAge:$('.stuAge').val(),
stuNumber:$('.stuNumber').val(),
stuScore:$('.stuScore').val(),
},
success:function(data){
console.log(data);
if(data.msg=='add success'){
alert('添加成功');
}else{
alert('添加失败');
}
}
});
});
$('button:eq(1)').click(function(){
});
$('button:eq(2)').click(function(){
});
$('button:eq(3)').click(function(){
$.ajax({
type:'get',
url:'http://127.0.0.1/day3/code/lesson7_html&php&mysql/lesson7_select.php',
dataType:'json',
success:function (data){
console.log(data);
},
error: function (err){
console.log(err);
}
});
});
</script>
</body>
</html>
<?php
//查询功能的后台php文件
$success = array('status' => 'success');
$error = array('status' => 'error');
$con = mysqli_connect('localhost','root','','studb');
if($con){
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_results=utf8');
$sql = "select * from gradeonesheet where 1";
$result = $con->query($sql);
if($result->num_rows>0){
$info = [];
for($i=0; $row=$result->fetch_assoc(); $i++){
$info[$i] = $row;
}
//
echo json_encode($info);
}
}
?>
<?php
//添加数据的
$success = array('status' => 'OK');
$error = array('status' => 'error');
$con = mysqli_connect('localhost','root','','studb');
if($con){
mysqli_query($con, 'set names utf8');
mysqli_query($con, 'set character_set_client=utf8');
mysqli_query($con, 'set character_set_results=utf8');
//
$stuName = $_POST['stuName'];
$stuGender = $_POST['stuGender'];
$stuAge = $_POST['stuAge'];
$stuNumber = $_POST['stuNumber'];
$stuScore = $_POST['stuScore'];
$sql = "insert into gradeonesheet values('$stuName','$stuGender','$stuAge','$stuNumber','$stuScore')";
$result = $con->query($sql);
if($result){
$success['msg'] = 'add success';
echo json_encode($success);
}else{
$error['msg'] = 'add failed';
echo json_encode($error);
}
}else{
$error['msg'] = 'database connect failed';
echo json_encode($error);
}
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