MDB_Common::queryCol()

MDB_Common::queryCol() – Fetch a single column

Synopsis

require_once 'MDB.php';

array &queryCol ( string $query , string $type = null , mixed $colnum = 0 )

Description

Fetch a single column from a result set of a query. The function takes care of doing the query and freeing the results when finished.

Parameter

string $query

the SQL query

string $type

if supplied, the type of the column in the result set will be set for fetching

array $params

if supplied, prepareQuery()/ executeQuery() will be used with this array as execute parameters

array $param_types

if supplied, the values in $param will automatically set to the passed datatypes

mixed $colnum

which column to return (integer [column number, starting at 0] or string [column name])

Return value

array - the first row of results as an array indexed from 0 or a MDB_Error, if fail

Throws

Possible PEAR_Error values
Error code Error message Reason Solution
MDB_ERROR_NO_DB_SELECTED NULL No database was chosen. Check the DSN in connect() .
MDB_ERROR_TRUNCATED NULL The result set contains fewer then two columns Check the SQL query or choose another query*() function
every other error code   Database specific error Check the database related section of PHP-Manual to detect the reason for this error. In the most cases a misformed SQL statement. Ie. using LIMIT in a SQL-Statement for an Oracle database.

Note

This function can not be called statically.

fetch result set as a nested array (Previous) fetch the first column of the first row (Next)
Last updated: Fri, 18 Apr 2014 — Download Documentation
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