Tag Archives: SET AUTOSHARE

SET AUTORDER

Posted on by vivaclipper

SET AUTORDER

Defines the default controlling index for automatically opened index files.

Syntax

      SET AUTORDER TO <nOrder>

Arguments

<nOrder> This is a numeric value specifying the ordinal position of the index to select as the controlling index when SET AUTOPEN is set to ON. The default is zero.

Description

When SET AUTOPEN is set to ON and the RDD supports automatic opening of structural indexes, the SET AUTORDER command specifies the index to activate as the controlling index. The default value for <nOrder> is zero, i.e. no controlling index is activated when an index file is automatically opened with the USE command. In this case, records of the database are accessible in physical order in the work area.

Note

Refer to SET AUTOPEN for an example of automatic selection of the controlling index.

Seealso

OrdSetFocus(), Set(), SET AUTOPEN, SET AUTOSHARE, USE

SET AUTOPEN

Posted on by vivaclipper

SET AUTOPEN

Toggles automatic opening of a structural index file

Syntax

      SET AUTOPEN ON | off | (<lOnOff>)

Arguments

ON | off | (<lOnOff>) The option toggles if a structural index file is automatically opened with the USE command. With ON or .T. (true), an index file is automatically opened. OFF or .F. (false) switch this mode off.

Description

Some replaceable database drivers support automatic opening of index files with the USE command when the index file has the same file name as the database file (without extension). An example is the DBFCDX driver. SET AUTOPEN toggles this behavior.

When SET AUTOPEN is set to ON, which is the default, the USE command automatically opens an index file having the same name as the database file and the file extension returned from OrdBagExt().

Note

If an index file is automatically opened, a controlling index is not activated. The default index order is zero, i.e. records are accessible in physical order in the work area. To select a controlling index, call OrdSetFocus() or use SET AUTORDER for a default controlling index

Example

      // The example demonstrates the effect of SET AUTOPEN with the
      // DBFCDX driver.

      REQUEST DBFCDX

      PROCEDURE Main

         RddSetDefault( "DBFCDX" )
         SET AUTOPEN OFF

         USE Customer
         INDEX ON CustID                    TAG ID   TO Customer
         INDEX ON Upper(LastName+FirstName) TAG Name TO Customer

          USE Customer
          ? OrdCount(), OrdKey()        // result: 0  ""

          SET AUTOPEN ON

          USE Customer
          ? OrdCount(), OrdKey()        // result: 2  ""

          SET AUTORDER TO 1

          USE Customer
          ? OrdCount(), OrdKey()        // result: 2  CUSTID
          ? Ordkey( 2 )                 // result: Upper(LastName+FirstName)

          USE
       RETURN

Seealso

OrdListAdd(), OrdSetFocus(), Set(), SET AUTORDER, SET AUTOSHARE, USE