PHP realizes data interaction with MySQL

PHP Is a powerful server-side scripting language for creating dynamic interactive sites

MySQL Is the most popular relational database management system , Especially WEB Application is very important

So how do these two interact , The method is as follows ：

PHP And MySQL Interaction

The following is a brief description of a simple hotel module business control on and off php call mysql

PHP call MySQL Insert data into

Add hotel information

<?php
/*
 *  The front end can call this php Script adds hotel room information , The corresponding table is dwd_hotel_module_baseinfo
    s_hotel_id int comment ' The hotel ID' ,
	s_hotel_name varchar(50) comment ' Hotel name ',
 */

//  These variables are the values passed in by the front end 
$s_hotel_id = $_POST["s_hotel_id"];
$s_hotel_name = $_POST["s_hotel_name"];

//  Fill in the database information here 
$conn=mysqli_connect("localhost","root","passwd1","database1");

//  Detection connection 
if (mysqli_connect_errno())
{
    echo " The connection fails : " . mysqli_connect_error();
}

//  The integer type is ".$number."    The character type is '".$string."'
$sql = "INSERT INTO dwd_hotel_module_baseinfo(s_hotel_id,s_hotel_name) 
        VALUES (".$s_hotel_id.",'".$s_hotel_name."')";

if ($conn->query($sql) === TRUE) {
    echo " New record inserted successfully ";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
?>

 PHP call MySQL Data update

Control power on and off by changing the field value

<?php

/*
 *  The front end can call this php Script to control power on ,ads_module_onoff_switch,
	s_module_id varchar(20) primary key comment ' modular ID',
	n_status bigint comment ' Power on switch control  0 Delegate energized ,1 It means no electricity '
 */

//  These variables are the values passed in by the front end 
$s_module_id = $_POST["s_module_id"];
$n_status = $_POST["n_status"];

//  Fill in the database information here 
$conn=mysqli_connect("localhost","root","passwd1","database1");

//  Detection connection 
if (mysqli_connect_errno())
{
    echo " The connection fails : " . mysqli_connect_error();
}

mysqli_query($conn,"UPDATE ads_module_onoff_switch SET n_status = ".$n_status."
WHERE s_module_id= ".$s_module_id." ");

mysqli_close($conn);
?>

PHP call MySQL Return the data (JSON type )

php call mysql Data and return json Data to front end

<?php
/*
 *  The front end can call this php Script to get the power on status of the module , The duration of power on ,dws_hotel_module_day_status,
	s_module_id varchar(20) primary key comment ' modular ID',
	n_status int comment ' adopt ads_module_onoff_switch relation ',
	n_eleuse_long double comment ' The duration of power on , when ',
	n_date int comment ' Date of the day '
 */

//  These variables are the values passed in by the front end 
$s_module_id = $_POST["s_module_id"];
$n_date = date('Ymd', time());
//  Fill in the database information here 
$conn=mysqli_connect("localhost","root","passwd1","database1");

//  Detection connection 
if (mysqli_connect_errno()) {
    echo " The connection fails : " . mysqli_connect_error();
}

$result1 = mysqli_query($conn, "SELECT case when n_status = 1 then ' Electrify ' else ' power failure ' end as n_status FROM ads_module_onoff_switch 
where s_module_id = '".$s_module_id."' ");

while ($row = mysqli_fetch_array($result1)) {
    $n_status = $row['n_status'];
}

$result2 = mysqli_query($conn, "SELECT round(sum(n_eleconn_long)/3600,2) as long1 FROM table1 
where s_module_id = '".$s_module_id."' and FROM_UNIXTIME(n_eledisconn_time,'%Y%m%d')= '".$n_date."'");

while ($row = mysqli_fetch_array($result2)) {
    $n_eleuse_long = $row['long1'];
}

//header('Content-Type:application/json; charset=utf-8');

$arr = array('s_module_id'=>$s_module_id,'n_status'=>$n_ele_status,'n_eleuse_long'=>$n_eleuse_long,'n_date'=>$n_date);
#  return json Data is used by the front end 
exit(json_encode($arr,JSON_UNESCAPED_UNICODE));

$conn->close();

?>

 

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