Valores de fstat

Fstat

fstat is a numeric status that is returned upon execution of a database operation, a sequential file operation, or a lock instruction.

Syntax

fstat

Examples

# MYTABLE is a table with a key called KEY1, that has a unique component called KEYVAL
# Create a record in the table MYTABLE with they key value 1 if it doesn't exist 
Local File MYTABLE [MYT]
Read [MYT]KEY1=1
If fstat
   [MYT]KEYVAL=1 : Write [MYT]
   If fstat
      MSG="The key was created in the mean time"
   Else
      MSG="Key created"
   Endif
Else
   MSG="Key already exists"
Endif

Details

fstat is always set to '0' if the operation is successfully completed, and has a non-null value if there is an error:

In a sequential read (Getseq and Rdseq), fstat is set to '1' at the end of the file.
On Lock, fstat is set to '1' if the lock could not be performed.
For a database operation (Read, Look, Readlock, For, Write, Delete, Rewrite, DeleteByKey, and RewriteByKey), the error statuses are from 1 to 7, as shown in the following table.

Note that the use of literal numbers should be avoided: dedicated constants exist for this purpose.

Constant	Value	Explanation
[V]CST_AOK	0	Operation succeeded.
[V]CST_ALOCK	1	Record is locked.
[V]CST_AOUTSEARCH	2	In <= or >= read mode, indicates that read succeeded, but the key found is not equal to the value.
[V]CST_ADUPKEY	3	Duplicate value on unique index.
[V]CST_AOUTKEYS	4	Attempt of reading a key value that is smaller or greater than all existing key values.
[V]CST_ANOREC	5	Record not read (no current record exists).
[V]CST_ARECTICKUPD	6	Update conflict: the line no longer exists with the right updtick value (concurrency error during an update operation).
[V]CST_ARECTICKDEL	7	Delete conflict: The line no longer exists with the right updtick value (concurrency error during a delete operation).

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