BMDBFCDX RDD:
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Is a DBFCDX RDD compatible with clipper 5.3, use SET OPTIMIZE ON to make a
static bitmap filters, with SET OPTIMIZE OFF works as harbour DBFCDX.
Addons:
BM_DbSeekWild( uKey, [lSoftSeek], [lFindLast], [lNext], [lAll] ) => .T./.F. or aSeekRec when lAll clause
BM_Turbo( lOnOff ) // Is only recomendable to use it on creating FILTERS
BM_DbGetFilterArray() => aFilterRec
BM_DbSetFilterArray( aFilterRec )
BM_DbSetFilterArrayAdd( aFilterRec )
BM_DbSetFilterArrayDel( aFilterRec )
Respecting command:
SET OPTIMIZE
Change the setting that determines whether to optimize using the open orders
when processing a filtered database file
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Syntax
SET OPTIMIZE ON | OFF | (<lToggle>)
Arguments
ON enables optimization.
OFF disables optimization.
<lToggle> is a logical expression that must be enclosed in
parentheses. A value of true (.T.) is the same as ON, and a value of
false (.F.) is the same as OFF.
Note: The initial default of this setting depends on the RDD.
Description
For RDDs that support optimization, such as DBFCDX, SET OPTIMIZE
determines whether to optimize filters based on the orders open in the
current work area. If this flag is ON, the RDD will optimize the search
for records that meet the filter condition to the fullest extent
possible, minimizing the need to read the actual data from the database
file.
If this flag is OFF, the RDD will not optimize.
Examples
¦ The following example enables optimization for the Inventor
database file using the SET OPTIMIZE command:
USE Inventor NEW VIA "DBFCDX"
SET OPTIMIZE ON
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