C5_LASTREC

 LASTREC()
 Determine the number of records in the current .dbf file
------------------------------------------------------------------------------
 Syntax

     LASTREC() | RECCOUNT()* --> nRecords

 Returns

     LASTREC() returns the number of physical records in the current database
     file as an integer numeric value.  Filtering commands such as SET FILTER
     or SET DELETED have no effect on the return value.  LASTREC() returns
     zero if there is no database file in USE in the current work area.

 Description

     LASTREC() is a database function that determines the number of physical
     records in the current database file.  LASTREC() is identical to
     RECCOUNT() which is supplied as a compatibility function.

     By default, LASTREC() operates on the currently selected work area.  It
     will operate on an unselected work area if you specify it as part of an
     aliased expression (see example below).

     Note:  Although the functionality of RECNO() has been expanded to
     encompass the concept of "identity," the LASTREC() function continues to
     return only record numbers--not identities.  LASTREC() has no expanded
     functionality, so it is not "identity-aware."

 Examples

     .  This example illustrates the relationship between LASTREC(),
        RECCOUNT(), and COUNT:

        USE Sales NEW
        ? LASTREC(), RECCOUNT()            // Result: 84 84
        //
        SET FILTER TO Salesman = "1001"
        COUNT TO nRecords
        ? nRecords, LASTREC()            // Result: 14 84

     .  This example uses an aliased expression to access the number
        of records in a open database file in an unselected work area:

        USE Sales NEW
        USE Customer NEW
        ? LASTREC(), Sales->(LASTREC())

 Files   Library is CLIPPER.LIB.

See Also: COUNT EOF()



Simple Clipper Extensions

Simple extensions

Exact comparisons,
Name precedence,
SELECT 0,
Alias functions,
Call by reference and value,
Other Clipper extensions

C5 Database Functions

AFIELDS() :

Fill arrays with the structure of the current database file

AFIELDS([<aFieldNames>],
    [<aTypes>],
    [<aWidths>],
    [<aDecimals>]) --> nFields

ALIAS() : 

Return a specified work area alias

ALIAS([<nWorkArea>]) --> cAlias

BOF() : 

Determine when beginning of file is encountered

BOF() --> lBoundary

DBAPPEND() : 

Add a new record

DBAPPEND() --> NIL

DBCLEARFILTER() : 

Clear a filter condition

    DBCLEARFILTER() –> NIL

DBCLEARIND() :  Close all indexes for the current work area

    DBCLEARINDEX() --> NIL

DBCLEARREL() : 

Clear active relations

DBCLEARRELATION() --> NIL

DBCLOSEALL() : 

Close all occupied workareas

DBCLOSEALL() --> NIL

DBCLOSEAREA() : 

Close a workarea

DBCLOSEAREA() --> NIL

DBCOMMIT() : 

Flush pending updates

DBCOMMIT() --> NIL

DBCOMMITALL() : 

Flush pending updates in all workareas

DBCOMMITALL() --> NIL

DBCREATE() : 

Create a database file from a database structure array

DBCREATE(<cDatabase>, <aStruct> [, <cDriver> ] ) --> NIL

DBCREATEIND() : 

Create an Index

   DBCREATEINDEX(<cIndexName>, <cKeyExpr>,
        [<bKeyExpr>], [<lUnique>]) --> NIL

DBDELETE() : 

Mark a record for deletion

DBDELETE() --> NIL

DBEDIT() : 

        Browse records in a table layout

    DBEDIT([<nTop>], [<nLeft>],
        [<nBottom>], <nRight>],
        [<acColumns>],
        [<cUserFunction>],
        [<acColumnSayPictures> | <cColumnSayPicture>],
        [<acColumnHeaders> | <cColumnHeader>],
        [<acHeadingSeparators> | <cHeadingSeparator>],
        [<acColumnSeparators> | <cColumnSeparator>],
        [<acFootingSeparators> | <cFootingSeparator>],
        [<acColumnFootings> | <cColumnFooting>]) --> NIL

DBEVAL() : 

Evaluate a code block for each record

DBEVAL(<bBlock>,
    [<bForCondition>],
    [<bWhileCondition>],
    [<nNextRecords>],
    [<nRecord>],
    [<lRest>]) --> NIL

DBF()* : 

Return current alias name

DBF() --> cAlias

DBFIELDINFO() : 

Return and optionally change information about a field

   DBFIELDINFO(<nInfoType>,

        <nFieldPos>,
        [<expNewSetting>]) --> uCurrentSetting

DBFILEGET() : 

Insert the contents of a field into a file

     DBFILEGET(<nFieldPos>, <cTargetFile>, <nMode>)
        --> lSuccess

DBFILEPUT() : 

Insert the contents of a file into a field

     DBFILEPUT(<nFieldPos>, <cSourceFile>)
        --> lSuccess

 DBFILTER() : 

Return the current filter expression as a character string

DBFILTER() --> cFilter

DBGOBOTTOM() : 

Move to the last logical record

DBGOBOTTOM() --> NIL

DBGOTO() : 

Move to a particular record

DBGOTO(<nRecordNumber>) --> NIL

DBGOTOP() : 

Move to the first logical record

DBGOTOP() --> NIL

DBINFO() : 

         Return and optionally change database file information

    DBINFO(<nInfoType>, [<expNewSetting>])
        --> uCurrentSetting

DBORDERINFO() :          Return and optionally change information about orders and index files

    DBORDERINFO(<nInfoType>,   [<cIndexFile>],
        [<cOrder> | <nPosition>],
        [<expNewSetting>]) --> uCurrentSetting

DBRECALL() : 

Reinstate a record marked for deletion

DBRECALL() --> NIL

DBRECORDINFO() :

         Return and optionally change information about a record

    DBRECORDINFO(<nInfoType>,
        [<nRecord>],
        [<expNewSetting>]) --> uCurrentSetting

DBREINDEX() :

         Recreate all active indexes for the current work area

    DBREINDEX() --> NIL

DBRELATION() :

Return the linking expression of a specified relation

DBRELATION( <nRelation> ) --> cLinkExp

DBRLOCK() :      

         Lock the record at the current or specified identity

    DBRLOCK([<xIdentity>]) --> lSuccess

DBRLOCKLIST()          Return an array of the current lock list

   DBRLOCKLIST() --> aRecordLocks

DBRSELECT() :

Return the target workarea number of a relation

DBRSELECT( <nRelation> ) --> nWorkArea

DBRUNLOCK()    

          Release all or specified record locks

    DBRUNLOCK([<xIdentity>]) --> NIL

DBSEEK() : 

Search for a key value

DBSEEK(<expKey>, [<lSoftSeek>]) --> lFound

DBSELECTAR() : 

Change the current workarea

DBSELECTAREA(<nArea> | <cAlias>) --> NIL

DBSETDRIVER() : 

Set the default database driver

DBSETDRIVER([<cDriver>]) --> cCurrentDriver

DBSETFILTER() : 

Set a filter condition

DBSETFILTER(<bCondition>, [<cCondition>]) --> NIL

DBSETINDEX()    

         Empty orders from an order bag into the order list

    DBSETINDEX(<cOrderBagName>) --> NIL

DBSETORDER()

Set the controlling order

    DBSETORDER(<nOrderNum>) --> NIL

DBSETRELAT() :

Relate two workareas

DBSETRELATION( <nArea> | <cAlias>, <bExpr>, [<cExpr>]) --> NIL

DBSKIP() : 

Move relative to the current record

DBSKIP([<nRecords>]) --> NIL

DBSTRUCT() : 

Create an array containing the structure of a database file

DBSTRUCT() --> aStruct

DBUNLOCK()

Release all locks for the current work area

    DBUNLOCK() --> NIL

DBUNLOCKALL()

Release all locks for all work areas

    DBUNLOCKALL() --> NIL

DBUSEAREA() : 

Use a database file in a workarea

DBUSEAREA( [<lNewArea>],
    [<cDriver>],
    <cName>,
    [<xcAlias>],
    [<lShared>],
    [<lReadonly>]) --> NIL

DELETED() : 

Return the deleted status of the current record

DELETED() --> lDeleted

EOF() : 

Determine when end of file is encountered

EOF() --> lBoundary

FCOUNT() : 

Return the number of fields in the current (.dbf) file

FCOUNT() --> nFields

FIELD() : 

Return a field name from the current (.dbf) file

    FIELD/FIELD(<nPosition>) --> cFieldName

FIELDBLOCK() :

Return a set-get code block for a field variable

FIELDBLOCK(<cFieldName>) --> bFieldBlock

FIELDGET() : 

Retrieve the value of a field using the ordinal position of the field in the database structure

FIELDGET(<nField>) --> ValueField

FIELDNAME() : 

Return a field name from the current (.dbf) file

FIELDNAME/FIELD(<nPosition>) --> cFieldName

FIELDPOS() : 

Return the position of a field in a workarea

FIELDPOS(<cFieldName>) --> nFieldPos

FIELDPUT() : 

Set the value of a field variable using the ordinal position of the field in the database structure

FIELDPUT(<nField>, <expAssign>) --> ValueAssigned

FIELDWBLOCK() : 

Return a set-get block for a field in a given workarea

FIELDWBLOCK(<cFieldName>, <nWorkArea>) --> bFieldWBlock

FLOCK() : 

Lock an open and shared database file

    FLOCK() –> lSuccess

FOUND() : 

Determine if the previous search operation succeeded

FOUND() --> lSuccess

HEADER() : 

Return the current database file header length

HEADER() --> nBytes

LASTREC() : 

Determine the number of records in the current (.dbf) file

LASTREC() | RECCOUNT()* --> nRecords

LUPDATE() : 

Return the last modification date of a (.dbf) file

LUPDATE() --> dModification

RECCOUNT()* : 

Determine the number of records in the current (.dbf) file

RECCOUNT()* | LASTREC() --> nRecords

RECNO() : 

Return the current record number of a work area

RECNO() --> nRecord

RECSIZE() : 

Determine the record length of a database (.dbf) file

RECSIZE() --> nBytes

RLOCK()

Lock the current record in the active work area

    RLOCK() --> lSuccess

SELECT() : 

Determine the work area number of a specified alias

SELECT([<cAlias>]) --> nWorkArea

USED() : 

Determine if a database file is in USE

USED() --> lDbfOpen