Question about PHP, where I can not do an exclusion with a "

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Question about PHP, where I can not do an exclusion with a "

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#1 by (2 votes)

1

So I am not able to find out about an exclusion code where it contains a condition. If it is a registered course, if it is a foreign key in the user table, it can not be excluded from the course table.

I will leave the print of the tables below and the exclusion code that is not receiving the value, if anyone can help I will be grateful.

Here is the exclude code:

<?php

include "../includes/conexao.php";

$idcurso = $_GET['idcurso'];
$curso = $_GET['curso'];
$usuario = $_GET['usuario'];

$consulta = mysqli_query("SELECT * FROM usuario WHERE curso = $curso");
$numregistros = mysqli_num_rows($consulta);

if($numregistros == "0") {
    $sql ="DELETE FROM curso where idcurso = $idcurso";
} else {
    echo "<script> alert ('Não foi possível deletar pois se encontra cadastrado um nome ao curso desejado a exclusão:'); location.href='curso.php';</script>";
}

Below is the print of the tables.

php mysqli

asked by anonymous 18.03.2018 / 16:27

1 answer

Connect database class How to select attributes and values in select

score 2 · Accepted Answer

The error is that the connection to the database is missing:

$consulta = mysqli_query($conexao, "SELECT * FROM usuario WHERE curso = '$curso'");

Your script will look like this:

<?php

include "../includes/conexao.php";

$idcurso = $_GET['idcurso'];
$curso = $_GET['curso'];
$usuario = $_GET['usuario'];

$consulta = mysqli_query($conexao, "SELECT * FROM usuario WHERE curso = '$curso'");
$numregistros = mysqli_num_rows($consulta);

if($numregistros == 0) {
    $sql ="DELETE FROM curso where idcurso = $idcurso";
    mysqli_query($conexao, $sql); // aqui você deleta
} else {
    echo "<script> alert ('Não foi possível deletar pois se encontra cadastrado um nome ao curso desejado a exclusão:'); location.href='curso.php';</script>";
}

To open a connection you need to use mysqli_connect , like this:

$conexao = mysqli_connect( SERVIDOR, LOGIN, SENHA, NOME_DO_BANCO);