Help / WLanguage / Managing databases / HFSQL / HFSQL functions
  • Exporting the query content
  • Exporting a single record
  • Array items
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Stored procedures
Exports the records found in a data file (HFSQL or OLE DB), view or query to a JSON file.
// Export all customers
HExportJSON(CUSTOMER, "C:\TEMP\Customer.json", hExpCréation)
<Result> = HExportJSON(<Data file> [, <JSON file> [, <Items to export>]] [, <Options> [, <Progress Bar>]])
<Result>: Boolean
  • True if the operation was performed,
  • False if a problem occurs. HError is used to identify the error.
<Data file>: Character string
Name of the data file, view or query used. If this name is not specified, HExportJSON will use the last data file used by the last HFSQL function (function starting with "H").
<JSON file>: Optional character string
Full path of JSON file to generate.
<Items to export>: Optional character string
List of names of items to export. The names are delimited by single quotes and they are separated by commas or CR characters. The names of composite key items, binary items and binary memo items are ignored.
If this parameter is an empty string (""), all of the data file items are exported (except composite key, binary, binary memo, and password items).
<Options>: Optional constant
Specifies the creation mode of JSON file:
hExpBreakableThe export can be interrupted by pressing Esc.
If the export is interrupted, the JSON file is valid and it only contains the records exported before the interruption.
hExpCreationIf the JSON file already exists, it is overwritten. An error occurs if this option is not specified and if the JSON file exists.
(default value)
Standard operating mode.
<Progress Bar>: Optional control name or window name
Name of Progress Bar control or name of window used to show the progress of file creation.

Exporting the query content

To export the query content, you must initialize the query (HExecuteQuery) before using HExportJSON.

Exporting a single record

To export a single record to a JSON string, use HRecordToJSON.

Array items

If one of the exported items is an Array item, each element of the array item is exported in a new level:
"Item1":Data of item 1,
"Item2":Data of item 2,
[Data element 1, Data element 2, ...]

Reminder: Composite key, binary, binary memo and password items are ignored.
Business / UI classification: Business Logic
Component: wd290hf.dll
Minimum version required
  • Version 21
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Last update: 05/26/2022

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