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Help / WLanguage / Managing databases / HFSQL / HFSQL functions
  • Generic search/Exact-match search
  • Space characters at the end of item
  • Performing a search on a composite key
  • Search on an array item
  • Search and filter
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Stored procedures
HSeek (Function)
In french: HRecherche
ODBCNot available with this kind of connection
Positions on the first record of the data file whose value for a specific item is greater than or equal to a search value (generic search by default). The record is not read. To read the record, use HReadSeek.

The number of the current record is modified only when it is returned by HRecNum. For functions handling the current record number by default (functions HDelete, HRead, HModify, ...), the value of this number is not updated: you must use the HRecNum() function. For example: do not:
HDelete(Customer)
but
HDelete(Customer, HRecNum())
Read from smallest to largest browse item value (see notes for details).
Warning: Recording loaded into memory is not modified. HFSQL variables (e. g. Customer.Name, or the Name item of the Customer data file) are not updated.
In most cases, HSeek sets the position in the data file to loop through the records that match a condition. HNext is used to position on the next record corresponding to the condition.
Several cases may occur after the call to HSeek:
  • a record matching the condition has been found: function HFound returns True
  • the data file is empty or there is no record corresponding to the condition: function HOut returns True
Remarks:
  • By default, HSeekFirst and HSeekLast are used to perform an exact-match search.
  • By default, HSeek performs a generic search.
Example
// Generic search for the first record for which 
// the postal code starts with "75"
HSeek(Customer, ZC, "75")
// Exact-match search for the first record
// for which the Customer name is Moore
// Mode 7: Text field terminated by Caract(0)
HSeek(Customer, Name, "Moore" + Charact(0))

// Mode 5.5: Text field completed with spaces
HSeek(Customer, Name, Complete("Moore", 30))
Syntax
<Result> = HSeek(<Data file> , <Key item> , <Search value> [, <Options>])
<Result>: Boolean
  • True if the position was set,
  • False in case of error (blocking, ...): the recording is not played back.. This problem can be caused by:
    • or a positioning problem (empty data file, etc.): function HFound returns Faux and function HError returns 0.
    • an error: HError returns an integer other than 0. HErrorInfo returns more details.
<Data file>: Character string
Name of the HFSQL data file used.
<Key item>: Character string
Name of key item on which the search will be performed.
<Search value>: Type corresponding to the value
Value of the sought item.
<Options>: Optional constant (or combination of constants)
Configures:
  • the lock mode applied to the sought record.
  • the type of iteration
  • the type of search performed.
hIdenticalExact-match search (see the Notes).
A generic search is performed by default (parameter not specified).
hKeepFilterThe filter set by HFilter will be taken into account, even if the search key is not optimized for the filter. Reminder: HFilter returns the optimized search key for the filter.
Warning: in this case, on large data files, performance problems may occur..
Hyper File 5.5 This variable cannot be used.
hLimitParsingThe iteration will stop when the last searched value is found. The current record will correspond to the record found. In this case, HFound returns False and HOut returns True.
This constant is used to optimize the speed in Client/Server mode.
hLockNoNo blocking: the recording can be played back or modified by another application during playback.
hLockReadWriteRead/write lock: the record being read cannot be read or modified by another application.
OLE DB Lock in write-only. Operating mode equivalent to the hLockWrite constant.
hLockWriteWrite lock: the record currently read can be read by another application but it cannot be modified by another application.
Java Access through JDBC: This parameter is ignored.
OLE DBNative Connectors (Native Accesses) The lock options will have no effect if the locks are not supported by the OLE DB provider or by the Native Connector.
Hyper File 5.5 The lock options are ignored. Use locking read functions (HReadFirstLock) kept for backward compatibility.
Remarks

Generic search/Exact-match search

A generic search or an exact-match search will be performed according to <Sought value>.
  • Generic search: searches for all records beginning with the specified value
    To perform a generic search, the desired value must be specified in <Sought value>.
  • Case of exact-match search searches for all records corresponding exactly to the specified value.
    To perform an exact-match search, the size of the search argument must be exactly the same as the size of the key. The search argument must be filled with "space" characters for the text keys. To do so, use the Complete function.

Space characters at the end of item

By default, when a record is read, trailing spaces in text fields are not suppressed in the variables associated with the data file.
In order for the space characters to be deleted, use WithSpace.

Performing a search on a composite key

Several methods can be used to perform a search on a composite key:
Using a list of values
The following syntax is used to perform a search on a composite key:
HSeek(<File name>, <Name of composite key>, ...
[<Search value of first element of composite key>,
<Search value of first element of composite key>, ...])
Example:
// Find the record
HSeek(Customer, LastName_FirstName, ["MOORE","Vince"])
Hyper File 5.5 To perform generic searches on a composite key, all the components of composite key must be Text components. Otherwise, an exact-match search is performed.

Search on an array item

The search is performed on the first array element (element with index 1). To perform a search on the other array elements, use the filters or queries.

Search and filter

If a filter is enabled (HFilter), this filter is taken into account during the search.
Component: wd300hf.dll
Minimum version required
  • Version 9
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Last update: 12/07/2024

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