When you use query method, You'll get count right away
<?php
$dbh = new PDO('odbc:sample', 'db2inst1', 'ibmdb2');
$sth = $dbh->query("SELECT name, colour FROM fruit");
$count = $sth->columnCount();
echo 'query count is '.$count;
?>
PDOStatement::columnCount
(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.2.0)
PDOStatement::columnCount — Returns the number of columns in the result set
Descrição
Use PDOStatement::columnCount() to return the number of columns in the result set represented by the PDOStatement object.
If the PDOStatement object was returned from PDO::query(), the column count is immediately available.
If the PDOStatement object was returned from PDO::prepare(), an accurate column count will not be available until you invoke PDOStatement::execute().
Parâmetros
Esta função não possui parâmetros.
Valor Retornado
Returns the number of columns in the result set represented by the
PDOStatement object, even if the result set is empty. If there is no result set,
PDOStatement::columnCount() returns 0.
Erros/Exceções
Emite um erro de nível E_WARNING se o atributo PDO::ATTR_ERRMODE estiver definido
como PDO::ERRMODE_WARNING.
Lança uma exceção PDOException se o atributo PDO::ATTR_ERRMODE
estiver definido como PDO::ERRMODE_EXCEPTION.
Exemplos
Exemplo #1 Counting columns
This example demonstrates how PDOStatement::columnCount() operates with and without a result set.
<?php
$dbh = new PDO('odbc:sample', 'db2inst1', 'ibmdb2');
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
/* Count the number of columns in the (non-existent) result set */
$colcount = $sth->columnCount();
print "Before execute(), result set has $colcount columns (should be 0)\n";
$sth->execute();
/* Count the number of columns in the result set */
$colcount = $sth->columnCount();
print "After execute(), result set has $colcount columns (should be 2)\n";
?>O exemplo acima produzirá:
Before execute(), result set has 0 columns (should be 0) After execute(), result set has 2 columns (should be 2)
Veja Também
- PDO::prepare() - Prepares a statement for execution and returns a statement object
- PDOStatement::execute() - Executes a prepared statement
- PDOStatement::rowCount() - Returns the number of rows affected by the last SQL statement
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User Contributed Notes 1 note
756567406 at qq dot com ¶
7 years ago
