Metrologic IS1000 Series Betriebsanweisung PDF herunterladen (Seite 159)

Chapter

BASIC

Commands

153

Data records are not manipulated directly from the DBF file but rather through its

associated IDX files. The value of file pointers of the IDX files (index pointers) does not

represent the address of the data records stored in the DBF file. It indicates the sequence

number of a specific data record in the IDX file.

ADD_RECORD

Purpose

To add a record to a specified DBF file.

Syntax

ADD_RECORD(file%, data$)

Remarks

"file%" is an integer variable in the range of 1 to 5, indicating which DBF file to be

accessed.

"data$" is a string variable, representing the character string which the user intends

to add to the specified DBF file.

Example

ON COM(1) GOSUB HostCommand

...

HostCommand:

Cmd$ = READ_COM$(1)

CmdIdentifier$ = LEFT$(Cmd$, 1)

DBFNum% = VAL(MID$(Cmd$, 2, 1))

CardID$ = RIGHT$(Cmd$, LEN(Cmd$)-2)

IF CmdIdentifier$ = "+" THEN

ADD_RECORD(DBFNum%, CardID$)

ELSE

...

See Also

DEL_RECORD

Purpose

To delete the record pointed by the file pointer in a specified DBF file.

Syntax

DEL_RECORD(file% [,index%])

Remarks

"file%" is an integer variable in the range of 1 to 5, indicating which DBF file to be

accessed.

"index%" is an integer variable in the range of 1 to 3, indicating which IDX file to

be accessed. If it is not specified, then the default IDX file which keeps the original

data sequence will be used.

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Metrologic IS1000 Series Betriebsanweisung Seite 159