PDOSTATEMENT.FETCHCOLUMN(3) 1 PDOSTATEMENT.FETCHCOLUMN(3)PDOStatement::fetchColumn - Returns a single column from the next row of a result set
SYNOPSIS
public mixed PDOStatement::fetchColumn ([int $column_number])
DESCRIPTION
Returns a single column from the next row of a result set or FALSE if there are no more rows.
Note
PDOStatement.fetchColumn(3) should not be used to retrieve boolean columns, as it is impossible to distinguish a value of FALSE from
there being no more rows to retrieve. Use PDOStatement.fetch(3) instead.
PARAMETERS
o $column_number
- 0-indexed number of the column you wish to retrieve from the row. If no value is supplied, PDOStatement.fetchColumn(3) fetches
the first column.
RETURN VALUES PDOStatement.fetchColumn(3) returns a single column in the next row of a result set.
Warning
There is no way to return another column from the same row if you use PDOStatement.fetchColumn(3) to retrieve data.
EXAMPLES
Example #1
Return first column of the next row
<?php
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();
print("Fetch the first column from the first row in the result set:
");
$result = $sth->fetchColumn();
print("name = $result
");
print("Fetch the second column from the second row in the result set:
");
$result = $sth->fetchColumn(1);
print("colour = $result
");
?>
The above example will output:
Fetch the first column from the first row in the result set:
name = lemon
Fetch the second column from the second row in the result set:
colour = red
SEE ALSO PDO.query(3), PDOStatement.fetch(3), PDOStatement.fetchAll(3), PDO.prepare(3), PDOStatement.setFetchMode(3).
PHP Documentation Group PDOSTATEMENT.FETCHCOLUMN(3)
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PDO.QUERY(3) 1 PDO.QUERY(3)PDO ::query - Executes an SQL statement, returning a result set as a PDOStatement object
SYNOPSIS
public PDOStatement PDO::query (string $statement)
DESCRIPTION
PDOStatement PDO::query (string $statement, int $PDO::FETCH_COLUMN, int $colno) PDOStatement PDO::query (string $statement, int
$PDO::FETCH_CLASS, string $classname, array $ctorargs) PDOStatement PDO::query (string $statement, int $PDO::FETCH_INTO, object
$object)
PDO.query(3) executes an SQL statement in a single function call, returning the result set (if any) returned by the statement as a
PDOStatement object.
For a query that you need to issue multiple times, you will realize better performance if you prepare a PDOStatement object using PDO.pre-
pare(3) and issue the statement with multiple calls to PDOStatement.execute(3).
If you do not fetch all of the data in a result set before issuing your next call to PDO.query(3), your call may fail. Call PDOState-
ment.closeCursor(3) to release the database resources associated with the PDOStatement object before issuing your next call to
PDO.query(3).
Note
Although this function is only documented as having a single parameter, you may pass additional arguments to this function. They
will be treated as though you called PDOStatement.setFetchMode(3) on the resultant statement object.
PARAMETERS
o $statement
- The SQL statement to prepare and execute. Data inside the query should be properly escaped.
RETURN VALUES PDO.query(3) returns a PDOStatement object, or FALSE on failure.
EXAMPLES
Example #1
Demonstrate PDO::query
A nice feature of PDO.query(3) is that it enables you to iterate over the rowset returned by a successfully executed SELECT state-
ment.
<?php
function getFruit($conn) {
$sql = 'SELECT name, color, calories FROM fruit ORDER BY name';
foreach ($conn->query($sql) as $row) {
print $row['name'] . " ";
print $row['color'] . " ";
print $row['calories'] . "
";
}
}
?>
The above example will output:
apple red 150
banana yellow 250
kiwi brown 75
lemon yellow 25
orange orange 300
pear green 150
watermelon pink 90
SEE ALSO PDO.exec(3), PDO.prepare(3), PDOStatement.execute(3).
PHP Documentation Group PDO.QUERY(3)