- Handling a crossed record
- Number of crossed records
- Version of data file
- Crossing a record from a query
- Special cases
- xBase files
<Source>.Cross (Function) In french: <Source>.Raye
  Available only with these kinds of connection
// Crosses the record #123
Customer.Cross(123)
// Cross the customer orders
Order.ReadSeekFirst(CUSTNUM, ValCustNum)
WHILE Order.Found() = True
Order.Cross()
Order.ReadNext()
END
Syntax
<Result> = <Source>.Crossed([<Record number> [, <Options>]])
<Result>: Boolean - True if the record was crossed,
- False if an error occurred (locked record, integrity error, ...). HErrorInfo returns more details.
<Source>: Type corresponding to the specified source Name of HFSQL data file, query or view used. <Record number>: Optional integer Number of the record to cross.
If this parameter is not specified (equal to 0 or to the hCurrentRecNum constant), the current record will be crossed. <Options>: Optional constant Configures:- the lock mode applied to the crossed record. If no lock constant is specified, the crossed record is not locked.
| | hLockNo
(default value) | No lock: the crossed record will not be locked. | | hLockWrite | Lock in write mode: the current crossed record can be read and viewed (<Source>.Read) but cannot be re-enabled by another application. Only the current application can re-enable it. | | hLockReadWrite | Lock in read/write: the current crossed record cannot be read or re-enabled by another application. |
 Locks are managed only on HFSQL Client/Server data files or on data files handled by a Native Connector. An HFSQL Mobile record cannot be locked. Indeed, the operating system of Pocket PC does not allow you to lock records. - the integrity management applied to the crossed record.
| | | hIgnoreIntegrity | Ignores the integrity check for this operation, even if the automatic integrity check is enabled (HSetIntegrity). | | hCheckIntegrity | Checks the integrity for the operation, even if the automatic integrity check is disabled (HSetIntegrity). |
A WLanguage error occurs if the two constants are used at the same time. These constants have no effect on the cascading deletion.
Remarks Handling a crossed record - A crossed record will not be read:
- by the browse functions: <Source>.First, <Source>.Last, <Source>.Next, <Source>.Previous, <Source>.ReadFirst, <Source>.ReadLast, <Source>.ReadNext, <Source>.ReadPrevious, <Source>.Forward, <Source>.Backward
- by the search functions: <Source>.SeekFirst, <Source>.ReadSeekFirst, <Source>.SeekLast, <Source>.ReadSeekLast.
- A crossed record can be read by <Source>.Read.
- A crossed record can be re-enabled by <Source>.Modify or <Source>.Write.
- <Source>.State is used to find out the record status (active, crossed, deleted, etc.).
- The physical location of a crossed record can only be re-used (by <Source>.Add for example) after:
- the execution of <Source>.Free,
- a reindex operation (with compression).
Number of crossed records <Source>.NbRec is used to find out the number of crossed records in the data file. Remark: For backward compatibility with WEBDEV 1.5/WINDEV 5.5, the number of crossed records can also be returned by the H.NbDel variable. Version of data file If <Source>.Cross is successful, the data file version number is modified. This version number is returned by <Source>.Version. Crossing a record from a query A record can be crossed: Regardless of the query execution mode (with or without the hWithFilter constant), <Source>.Cross can only be used on single-file queries. Caution: - No record can be crossed in a query that is using the groups or aggregates.
- The management of integrity and duplicates is not performed during the operations on the multi-file queries: we recommend that you use the transactions to avoid any problem.
Special cases - Managing locks:
If a lock problem occurs when "crossing" a record (attempt to cross a record locked in write mode for example), the record is not modified and HErrorLock returns True.
No management of locks is performed. Indeed, the operating system of Pocket PC does not allow you to lock records. - Managing the referential integrity
If the management of the referential integrity is enabled (HSetIntegrity) and if the integrity is not checked during the deletion, <Source>.Cross is not run. HErrorIntegrity must be checked after <Source>.Cross. - Deleted records
<Source>.Cross must not be called on a record that was deleted beforehand.
This page is also available for…
|
|
|