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  • Read operation according to a key item or not
  • Memos
  • Browsing the records corresponding to a condition
  • Modifying the value of search key
  • Locks
  • Various
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WindowsLinuxPHPWEBDEV - Browser code
AndroidAndroid Widget iPhone/iPadApple WatchUniversal Windows 10 AppWindows Mobile
Stored procedures
Sets the position on the next data file record according to a browse item. The record is read and the HFSQL variables are updated (Customer.Name for example, which means the Name item of Customer file).
The reading is performed from the lowest value to the greatest value of the browse item (see remarks for more details).
<Source>.ReadNext is used to position in the data file during a browse loop. This function can only be run:
Several cases may occur after the call to <Source>.ReadNext:
  • the file is empty or there is no record corresponding to the filter (defined by <Source>.Filter): no reading is performed and <Source>.Out returns True.
  • the function tries to lock a record that is already locked in read-only: no read operation is performed, HErrorLock returns True and <Source>.Out returns True.

    PHP The locks are not available in PHP.

    Java Access by JDBC: The management of locks is not available for databases accessed by JDBC.
This function can be used with the data files, HFSQL views or queries. Remark: From version 19, HFSQL is the new name of HyperFileSQL.
WHILE Customer.Out() = False
// Process the record
<Result> = <Source>.ReadNext([<Browse item> [, <Options>]])
<Result>: Boolean
Corresponds to:
  • False if an error occurred. In this case, HError returns an integer other than 0. HErrorInfo returns more details about the error. The record is not read.
  • the value of <Source>.Found in the other cases (the record can be read, even if <Result> returns False).
<Source>: Type corresponding to the specified source
Name of data file, view or query used.
<Browse item>: Optional character string (with or without quotes)
Name of item used to browse the data file, view or query. If this name is not specified, <Source>.ReadNext will use:
  • For a data file: the last browse item used on this data file by the last HFSQL management function (function starting with "H"). If this item does not exist, the best browse item is automatically used.
  • For a query: the ORDER BY of query if it exists, otherwise the last item used.
  • For a view: the sort item of view (if it exists), otherwise the last item used.
<Options>: Optional constant (or combination of constants)
Used to configure:
  • the lock performed on the record read by <Source>.ReadNext
  • the management of duplicates. By default, all the duplicates are browsed.
hLockNoNo lock (even if HStartLock was called): the record can be read or modified by another application during the reading.
hLockWriteLock in write mode: the record currently read can be read by another application but it cannot be modified by another application.
hLockReadWriteLock in read/write: the record currently read cannot be read or modified by another application.
hDistinctIf duplicates are found, this constant allows you to read a single record among the duplicates. This parameter is taken into account only if the browse is performed on a key item.

OLE DBNative Connectors (Native Accesses) This constant is ignored.
Java Access by JDBC: This parameter is ignored.
OLE DBNative Connectors (Native Accesses) Lock options will have no effect if the OLE DB provider or Native Connector (also called Native Access) does not support locks.
OLE DB The lock options specified by <Source>.ReadNext will be ignored. The lock mode specified by <Source>.ReadFirst or <Source>.ReadLast will remain effective during the calls to <Source>.ReadNext and <Source>.ReadPrevious.
To modify the lock mode, you must use:
PHP <Options> is ignored.

Read operation according to a key item or not

If the item is a key, <Source>.ReadNext reads the record with the greatest key value. The sort order is the one that was specified in the analysis for this key.
Remark: In a search loop (<Source>.ReadSeekFirst for example), when <Source>.ReadNext reads the record with the greatest key value, <Source>.Found allows you to find out whether the record corresponds (or not) to the sort criterion. If the item is not a key, <Source>.ReadNext reads the next active record. When browsing the data file, the records will be sorted according to their record number.
In this case, the selected search item will appear in red in the code editor and a warning will be displayed in the "Code" pane.
Remark: The automatic completion proposes the key items only.


The memos associated with the record can be automatically read (or not) when reading the record. <Source>.SetMemo is used to customize this automatic read operation.
If the memos are supported, the associated text memos are read when the record is read. The binary memos are read only when they are explicitly used (<Source>.ExtractMemo).

Browsing the records corresponding to a condition

In most cases, <Source>.ReadSeek, <Source>.ReadSeekFirst and <Source>.ReadSeekLast are used to position in the data file to perform a browse loop among the records corresponding to a condition. <Source>.ReadNext and <Source>.ReadPrevious are used to read the next or previous record corresponding to the condition:
  • if the item used is a key, <Source>.ReadNext will read the next records corresponding to the values greater than or equal to the sought value.
  • if the item used is not a key, <Source>.ReadNext will read the next records corresponding to the values equal to the sought value.
To ignore the search while going to the next or previous record, use one of the following functions:
Caution: if a browse must be performed by <Source>.ReadNext, the initial search (<Source>.ReadSeek, <Source>.ReadSeekFirst, <Source>.ReadSeekLast) must not use the hLimitParsing constant.

Modifying the value of search key

If the value of the browse item is modified before <Source>.ReadNext is used, the current record may be read again in the rest of browse by <Source>.ReadNext.
Indeed, modifying the browse item updates the file index key. This modification is taken into account when reading the next records.
This remark is also valid when using <Source>.ReadNext without search key a sorted query (ORDER BY).
Reports and QueriesUser code (UMC)AjaxHFSQLHFSQL Client/ServerStored proceduresHyper File 5.5OLE DBNative Connectors (Native Accesses)


By default (<Options> not specified), the record is not locked.
If a lock is specified (hLockWrite or hLockReadWrite constants), the record will be read only if this record is not already locked.
There is no need to specify a lock parameter if the data file is locked by HStartLock: the lock specified by HStartLock is automatically taken into account. To ignore the lock set by HStartLock, use the hLockNo constant.
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.


Component: wd260hf.dll
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