pdostatement.fetchcolumn(3) [php man page]

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)

PDOSTATEMENT.DEBUGDUMPPARAMS(3) 					 1					   PDOSTATEMENT.DEBUGDUMPPARAMS(3)

PDOStatement::debugDumpParams - Dump an SQL prepared command

SYNOPSIS

       public void PDOStatement::debugDumpParams (void	)

DESCRIPTION

	Dumps the information contained by a prepared statement directly on the output. It will provide the SQL query in use, the number of param-
       eters used ( Params), the list of parameters with their key name or position, their name, their position in the query (if this is supported
       by the PDO driver, otherwise, it will be -1), type ( param_type) as an integer, and a boolean value is_param.

	This is a debug function, which dumps the data directly to the normal output.

       Tip

	      As  with anything that outputs its result directly to the browser, the output-control functions can be used to capture the output of
	      this function, and save it in a string (for example).

	This will only dump the parameters in the statement at the moment of the dump. Extra parameters are not stored in the statement,  and  not
       displayed.

RETURN VALUES

	No value is returned.

EXAMPLES

       Example #1

	      PDOStatement.debugDumpParams(3) example with named parameters

	      <?php
	      /* Execute a prepared statement by binding PHP variables */
	      $calories = 150;
	      $colour = 'red';
	      $sth = $dbh->prepare('SELECT name, colour, calories
		  FROM fruit
		  WHERE calories < :calories AND colour = :colour');
	      $sth->bindParam(':calories', $calories, PDO::PARAM_INT);
	      $sth->bindValue(':colour', $colour, PDO::PARAM_STR, 12);
	      $sth->execute();

	      $sth->debugDumpParams();

	      ?>

	      The above example will output:

	      SQL: [96] SELECT name, colour, calories
		  FROM fruit
		  WHERE calories < :calories AND colour = :colour
	      Params:  2
	      Key: Name: [9] :calories
	      paramno=-1
	      name=[9] ":calories"
	      is_param=1
	      param_type=1
	      Key: Name: [7] :colour
	      paramno=-1
	      name=[7] ":colour"
	      is_param=1
	      param_type=2

       Example #2

	      PDOStatement.debugDumpParams(3) example with unnamed parameters

	      <?php

	      /* Execute a prepared statement by binding PHP variables */
	      $calories = 150;
	      $colour = 'red';
	      $name = 'apple';

	      $sth = $dbh->prepare('SELECT name, colour, calories
		  FROM fruit
		  WHERE calories < ? AND colour = ?');
	      $sth->bindParam(1, $calories, PDO::PARAM_INT);
	      $sth->bindValue(2, $colour, PDO::PARAM_STR);
	      $sth->execute();

	      $sth->debugDumpParams();

	      ?>

	      The above example will output:

	      SQL: [82] SELECT name, colour, calories
		  FROM fruit
		  WHERE calories < ? AND colour = ?
	      Params:  2
	      Key: Position #0:
	      paramno=0
	      name=[0] ""
	      is_param=1
	      param_type=1
	      Key: Position #1:
	      paramno=1
	      name=[0] ""
	      is_param=1
	      param_type=2

SEE ALSO

       PDO.prepare(3), PDOStatement.bindParam(3), PDOStatement.bindValue(3).

PHP Documentation Group 											   PDOSTATEMENT.DEBUGDUMPPARAMS(3)