Good day. I'm new to php and now wanted to learn on how to delete 3 tables from android to php by given a specific ID.
Table Info (id, name) Table Good (id, sun, tf) Table Bad (id, moon, ts)
<?php
//Getting Id
$id = $_GET['id'];
//Importing database
require_once('dbConnect.php');
//Creating sql query
$sql = "DELETE FROM info WHERE id=$id;";
$sql ="DELETE FROM Good WHERE tf=$id;";
$sql ="DELETE FROM Bad WHERE ts=$id;";
//Deleting record in database
if(mysqli_query($con,$sql)){
echo 'Employee Deleted Successfully';
}else{
echo 'Could Not Delete Employee Try Again';
}
//closing connection
mysqli_close($con);
?>
Error
Latest code
<?php
//Getting Id
$mysqli->multi_query(" Many SQL queries ; ");
$id = (int)$_GET['id'];
//Importing database
require_once('dbConnect.php');
//Creating sql query
$sql = "DELETE FROM informaation WHERE id=$id;";
$sql .= "DELETE FROM work_force WHERE twf=$id;";
$sql .= "DELETE FROM work_details WHERE ts_id=$id;";
//Deleting record in database
if(multi_query($con,$sql)){
echo ' Deleted Successfully';
}else{
echo 'Could Not Delete . Try Again.' . mysqli_error($con);
}
?>
You need to use a multi-query because you are presently overwriting your first 2 queries.
I modified your code to concatenate the query statements and the proper function for it, including error checking. Plus, assuming you did successfully connect using the mysqli_
library.
Your require_once('dbConnect.php');
should contain this below and replace the credentials below with your own.
$con = mysqli_connect("yourhost", "my_user", "my_password", "my_db");
Then do:
require_once('dbConnect.php');
$id = (int)$_GET['id'];
$sql = "DELETE FROM info WHERE id=$id;";
$sql .= "DELETE FROM Good WHERE tf=$id;";
$sql .= "DELETE FROM Bad WHERE ts=$id;";
//Deleting record in database
if(mysqli_multi_query($con,$sql)){
echo 'Employee Deleted Successfully';
}else{
echo 'Could Not Delete Employee Try Again.' . mysqli_error($con);
}
Reference:
Example from the manual:
<?php // WORKING CODE: $mysqli->multi_query(" Many SQL queries ; "); // OK while ($mysqli->next_result()) {;} // flush multi_queries $mysqli->query(" SQL statement #1 ; ") // now executed! $mysqli->query(" SQL statement #2 ; ") // now executed! $mysqli->query(" SQL statement #3 ; ") // now executed! $mysqli->query(" SQL statement #4 ; ") // now executed! ?>
Plus, make sure you do have a value for your GET array.
If it is indeed an integer, replace it with:
$id = (int)$_GET['id'];
Your present code is open to SQL injection . Use mysqli_*
with prepared statements , or PDO with prepared statements .
从i.info中删除g.good,b.bad,其中i.id = $ id AND g.id = $ id AND b.id = $ id
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