Warning: mysql_num_rows () expects parameter 1 to be resource, boolean given in [duplicate]

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I have a problem with the mysql_num_rows ()

  

"Warning: mysql_num_rows () expects parameter 1 to be resource, boolean   given "

I've been browsing other posts but none could help me. PHP looks like this: 

//Sistema de paginação

$sql_select_all = "SELECT id, nome, descricao, 'empresa' as empresa, 'empresa' as tipo  
                FROM tbl_empresa
                WHERE id LIKE '%".$colname_Pesquisa."%' OR nome LIKE '%".$colname_Pesquisa."%' OR descricao LIKE '%".$colname_Pesquisa."%'
                UNION ALL
                SELECT tbl_produto.id, tbl_produto.nome, tbl_produto.descricao, tbl_empresa.nome, 'produto' as tipo 
                FROM tbl_produto 
                JOIN tbl_empresa
                ON tbl_empresa.id = tbl_produto.tbl_empresa_id  
                WHERE tbl_produto.id LIKE '%".$colname_Pesquisa."%' OR tbl_produto.nome LIKE '%".$colname_Pesquisa."%' OR tbl_produto.descricao LIKE '%".$colname_Pesquisa."%'";

$sql_query_all = mysql_query($sql_select_all);

//O problema esta aqui
$total_registros = mysql_num_rows($sql_query_all);

I already checked the select and it is returning the expected value, so much it shows on the page. Realized that $total_registros e $sql_query_all do not return anything to me;

The code is working perfectly on my localhost (PHP 5.3.0), but when I went to the server (PHP 5.3.29) it appeared that error. I do not think there's any difference between those versions that would impact that way.

If anyone can help me, I'll be grateful!

    
asked by anonymous 01.10.2015 / 19:48

2 answers

0

The error was here: 

 mysql_query($sql_select_all) or die(mysql_error())

When doing this I was able to observe the error in sql and fix.

Thank you all!

    
05.10.2015 / 14:33
-1

Make the following change: 

$ret = mysql_query($sql_select_all);
if(!$ret){
    die("Erro de conexao")
}else{
    $total_registros = mysql_num_rows($sql_query_all);
}
    
01.10.2015 / 20:40
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I'm following the tutorial on this site

link

    
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