Difference between revisions of "USED()"

Revision as of 16:50, 8 December 2009

Purpose

Function to determine if a table is open

Syntax

USED([<expN> | <expC>])

See Also

ALIAS(), DBF(), INUSE(), NDX(), NETERR(), SELECT(), SET CACHELOAD, SET DCACHE, SET EXCLUSIVE, USE

Description

The USED() function with no parameter specified, returns .T. if there is a table open in the current workarea and .F. if the current workarea is empty. <expN> is a numeric expression giving a workarea number: 1-DB_MAXWKA in which to check for an open table. <expC>is a character expression giving a workarea letter, (A-Z/a-z excluding M/m) or a table alias in which to check for an open table. The alias can be specified in the USE command. If not specified, the table basename is used.

Example

// The demo view bridge opens
// the tables customer, accounts,
// state and products in workareas 1 – 4
use demo
? select()
         1
? used()
.T.
? used("product")
.T.
? used(5)
.F.

Products

Recital, Recital Server