Harbour All Functions – D

Date()
Day()
Days()

DaysInMonth()
DaysToMonth()

dbAppend()
dbClearFilter()
dbCloseAll()
dbCloseArea()
dbCommit()
dbCommitAll()
dbCreate()
dbDelete()
dbEval()
dbF()
dbFilter()
dbGoBottom()
dbGoTo()
dbGoTop()
dbReCall()
dbRLock()
dbRLockList()
dbRUnlock()
dbSeek()
dbSelectArea()
dbSetDriver()
dbSetFilter()
dbSkip()
dbSkipper()
dbStruct()
dbUnlock()
dbUnlockAll()
dbUseArea()

DecToBin()
DecToHexa()
DecToOctal()

Deleted()
Descend()
DevOutPict()
DirChange()
DirRemove()
DiskSpace()

DMY()
Do()
DoW()

DOY
DToC()

DToR
DToS()

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Harbour Database Functions

Database Functions

AFields Fills referenced arrays with database field information
Alias Returns the alias name of a work area
BOF Test for the beggining-of-file condition
dbAppend Appends a new record to a database file
dbClearFilter Clears the current filter condiction in a work area
dbCloseAll Close all open files in all work areas.
dbCloseArea Close a database file in a work area
dbCommit Updates all index and database buffers for a given workarea
dbCommitAll Flushes the memory buffer and performs a hard-disk write
dbCreate Creates an empty database from a array
dbDelete Mark a record for deletion in a database
dbEval Performs a code block operation on the current Database
DBF Alias name of a work area
dbFilter Return the filter expression in a work area
dbGoBottom Moves the record pointer to the bottom of the database
dbGoto Position the record pointer to a specific location
dbGoTop Moves the record pointer to the top of the database
dbRecall Recalls a record previousy marked for deletion
dbSeek Searches for a value based on an active index
dbSelectArea Change to another work area
dbSetDriver Establishes the RDD name for the selected work area
dbSetFilter Establishes a filter condition for a work area
dbSkip Moves the record pointer in the selected work area
dbSkipper Helper function to skip a database
dbStruct Builds a multidimensional array of a database structure
dbUseArea Opens a work area and uses a database file
Deleted Tests the record’s deletion flag
EOF Test for end-of-file condition
FCount Counts the number of fields in an active database
FieldDeci Determines the number of decimal places of a given numeric field
FieldGet Obtains the value of a specified field
FieldName Return the name of a field at a numeric field location
FieldPos Return the ordinal position of a field
FieldPut Set the value of a field variable
FieldSize Determines the size of a given field
FieldType Determines the type of a given field
Found Determine the success of a previous search operation
Header Return the length of a database file header
LastRec Returns the number of records in an active work area or database
LUpdate Yields the date the database was last updated
RecCount Counts the number of records in a database
RecNo Returns the current record number or identity
RecSize Returns the size of a single record in an active database
Select Returns the work area number for a specified alias
Used Checks whether a database is in use in a work area

C5_DBSELECTAREA

 DBSELECTAREA()
 Change the current work area
------------------------------------------------------------------------------
 Syntax

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

 Arguments

     <nArea> is a numeric value between zero and 250, inclusive, that
     specifies the work area being selected.

     <cAlias> is a character value that specifies the alias of a
     currently occupied work area being selected.

 Returns

     DBSELECTAREA() always returns NIL.

 Description

     DBSELECTAREA() causes the specified work area to become the current work
     area.  All subsequent database operations will apply to this work area
     unless another work area is explicitly specified for an operation.
     DBSELECTAREA() performs the same function as the standard SELECT
     command.  For more information, refer to the SELECT command.

 Notes

     .  Selecting zero: Selecting work area zero causes the lowest
        numbered unoccupied work area to become the current work area.

     .  Aliased expressions: The alias operator (->) can temporarily
        select a work area while an expression is evaluated and automatically
        restore the previously selected work area afterward.  For more
        information, refer to the alias operator (->).

 Examples

     .  The following example selects a work area via the alias name:

        cLast := "Winston"
        DBUSEAREA( .T., "DBFNTX", "Sales", "Sales", .T. )
        DBSETINDEX( "SALEFNAM" )
        DBSETINDEX( "SALELNAM" )
        //
        DBUSEAREA( .T., "DBFNTX", "Colls", "Colls", .T. )
        DBSETINDEX( "COLLFNAM" )
        DBSETINDEX( "COLLLNAM" )
        //
        DBSELECTAREA( "Sales" )      // select "Sales" work area
        //
        IF ( Sales->(DBSEEK(cLast)) )
           IF Sales->( DELETED() ) .AND. Sales->( RLOCK() )
              Sales->( DBRECALL() )
              ? "Deleted record has been recalled."
           ENDIF
        ELSE
           ? "Not found"
        ENDIF

 Files   Library is CLIPPER.LIB.

See Also: DBUSEAREA() RLOCK() UNLOCK SELECT SELECT() RLOCK()