Fetch the first column of the first row of data returned from a query. The function takes care of doing the query and freeing the results when finished.

Parameter

string $query

the SQL query or the statement to prepare

mixed $params

array, string or numeric data to be added to the prepared statement. Quantity of items passed must match quantity of placeholders in the prepared statement: meaning 1 placeholder for non-array parameters or 1 placeholder per array element.

If supplied, prepare()/ execute() is used.

Return value

mixed - the returned value or a DB_Error, if fail

Throws

Table 21-1. Possible PEAR_Error values

Error code	Error message	Reason	Solution
`DB_ERROR_INVALID`	`NULL`	SQL statment for preparing is not valid.	See the prepare() documentation, if you want to use a SQL statemt using placeholders.
`DB_ERROR_MISMATCH`	`NULL`	Quantity of parameters didn't match quantity of placeholders in the prepared statment.	Check that the number of placeholders in the prepare() statement passed to `$query` equals the count of entries passed to `$params`.
`DB_ERROR_NODBSELECTED`	`NULL`	No database was choosen.	Check the DSN in connect().
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 statment. Ie. using LIMIT in a SQL-Statment for an Oracle database.

Note

This function can not be called statically.

See

query(), limitQuery(), prepare(), execute(), getRow(), getCol(), getCol(), getCol()

Prev	Home	Next
DB_common::getListOf()	Up	DB_common::getRow()

Who's Online
Guest Users: 9

Free Sample Chapters
	Deliver First Class Web Sites: 101 Essential Checklists Want to learn how to make your web sites usable and accessible? Want to ensure that your sites meet current best practice, without spending hours trawling through incomprehensible specifications and recommendations from dozens of different books, research papers, and web sites? Want to make sure that the sites you build are "right the first time," requiring no costly redevelopments?
More Sample Chapters

PHP General