HImportText (Function)

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Ayuda / WLanguage / Administrar bases de datos / HFSQL / Funciones HFSQL

Importing a Text Memo item
Importing a Binary Memo item
Importing an indexed item
Importing a Time item
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HImportText (Function)

No disponible con este tipo de conexión

Imports a Text file into an HFSQL Classic or Client/Server data file. This data file must have been defined in the data model editor, or declared with HDeclare, HDeclareExternal or HDescribeFile).

Note: If the HFSQL data file used does not physically exist, it will be automatically created.

Ejemplo

// Imports the name, address and logo (binary memo) of customers.
// Reinitialize the other items.
// A line in the txt file therefore contains 3 or 5 columns:
// - Name, - Address, - File name for the logo
// (if the file name for the logo differs
// from empty string, 2 additional columns)
// - The type of the memo (IMG), - A comment
IF HImportText("CUSTOMER","C:\AnExample\Customer.txt", "NAME,ADDRESS,LOGO", hDefaultVal, "ProgressBar1") = False THEN
	Error("Unable to import")
ELSE
	// Process
END

// This file will be imported
sPathTextFile is string = "ImportPlayer.txt"

// This file contains 2 lines:
// "PlayerImport1","19850618"
// "PlayerImport2","19900512"

// sPlayerName and dBirthDate are 2 fields in the Player data file of type String and Date

IF HImportText(Player, sPathTextFile, "sPlayerName,dDateOfBirth", ...
    "," + Charact(127) + """" + Charact(127) + CR + Charact(127) + ".") THEN
	...
ELSE
	...
END

Sintaxis

<Result> = HImportText(<Data file> , <Full path of text file> , <List of items> , <Separators> [, <Options> [, <Progress Bar>]])

<Result>: Boolean

True if the operation was performed,
False if an error occurs. HError returns more details about the problem.

<Data file>: Character string

Name of the HFSQL data file to import into.

<Full path of text file>: Character string

Full access path to text file to import.

<List of items>: Character string

List of item names in the text file. Names can be delimited by single quotes and are separated by commas or CR characters. "Composite key" item names are ignored.
If this parameter is not specified or is an empty string (""), all items are imported (except compound keys) in the order in which they were created in the physical file.

<Separators>: Character string

List of separators used for columns, strings, rows and decimal places.
The various separators are separated by the character character(127) (for compatibility with WINDEV 5.5)..
<Column separator> + Charact(127) + <String separator> + Charact(127) +
<Row separator> + Charact(127) +<Decimal separator>
<Column separator>: String ("," by default).
<String separator>: Character (" by default)
<Row separator>: String (CR by default, i.e., Charact(13)+Charact(10))
<Decimal separator>: Character ("." or "," by default)

<Options>: Optional Integer constant (or combination of constants)

Configures the type of import to perform:
hCopyAutoID The automatic identifier is copied. It is not recalculated.
hImpCreation If the data file to import into exists, it will be overwritten.
hImpIgnoreFirstLine The first line of the imported file is ignored.
hImpIgnoreInvalidLine Import ignores lines with an invalid structure.
The structure is invalid if data is missing for one or more items, or if string separators are missing.
hImpIgnoreEmptyItem If one or more items are not populated in the text file, the corresponding lines are still imported.
The missing items contain:
the default value of the items if the hDefaultVal constant is specified.
the value of the items in the current record before calling HImportText.
hImpBreakable Import can be interrupted by pressing the Esc key (parameter ignored on data files in 5.5 format).
If the import is interrupted, the imported records are kept in the data file. A re-index operation is automatically performed if necessary (cannot be interrupted).
hImpNormal
(default value) If the data file to import into already exists, it is populated with the imported data; otherwise, the data file is created.
Data integrity and duplicates are not checked.
Non-imported items take the value of the current record.
String delimiters are used.
Automatic identifiers are recalculated.
Data integrity and duplicates are always checked.
hImpOEM2ANSI Imported strings are automatically converted from OEM to ANSI.
hImpNoDelimiter String separators, if any, are part of the item.
hImpTestDuplicates Checks for duplicate values on unique keys during an import operation (enabled only on unique keys, not on the entire record).
Always checks for duplicate values.
hImpTestIntegrity Checks data integrity during an import operation.
Data integrity is always checked.
hDefaultVal For non-imported items, the values of the current record are reinitialized:
with their default value if the hDefaultVal constant is specified.
with the value of the corresponding items in the current record before calling HImportText, if the hDefaultVal constant is not specified.

<Progress Bar>: Optional control name or window name

Name of the window in which the progress bar will be displayed,
Name of the Progress Bar control.
This parameter is not available.

Observaciones

Importing a Text Memo item

If the hImpNoDelimiter constant is not specified:
The text to import can contain <Row separator> or <Column separator>. The text to import must not contain any <String separator>.
If the hImpNoDelimiter constant is specified:
The text to import must not contain any <Row separator> or <Column separator> otherwise they will be interpreted as such. The text to import can contain <String separator>.

Importing a Binary Memo item

For a binary memo item, 3 columns are associated in the text file.

Column 1: Full path of the binary file to be added to the memo. This is a character string. If this string is empty, the two next columns must be left blank in the text file.
Column 2: Memo type. This is a string that can take the following values:
- "IMG" to indicate that the file is an image file.
- "WAV" to indicate that the file is a sound file.
- "OLE" to indicate that the file is an OLE file.
- "BIN" (or other) to indicate that the file is an ordinary binary file.
Column 3: Information formatted as a string of up to 65535 characters. If the number of characters is greater, the string is truncated.

Structure of the text file to import
Consider the following example:

items to be imported:
- <LASTNAME>: Text item
- <AGE>: Numeric item
- <FIRSTNAME>: Text item
- <COMMENT>: Text memo
- <PHOTO>: Image binary memo
delimiters used:
- <String separator>: "
- <Column separator>: ,
- <Row separator>: CR

In this example:

If the hImpNoDelimiter constant is not used, the text file will have the following structure: "LASTNAME", AGE, "FIRSTNAME", "COMMENT", "PHOTO memo file", "PHOTO file type", "PHOTO memo info"+CR
If the hImpNoDelimiter constant is used, the text file will have the following structure: LASTNAME, AGE, FIRSTNAME, COMMENT, PHOTO memo file, PHOTO memo type, PHOTO memo info+RC

Each content can be empty.

Importing an indexed item

HImportText cannot be used to import indexed items.

Importing a Time item

HImportText saves invalid times if the times to import are not in one of the formats available in the analysis.

Reminder: The available formats in the analysis are: