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- Using the EXTERN keyword
- File description
- Limitations
HDBDescribeFile (Function)
  Disponible solo con estos tipos de conexión
Describes a data file in dBase3 format (most common format) programmatically. This function is used to specify the name, abbreviation and access path of xBase file. HDBDescribeFile("DBCUSTOMER", "CD", "C:\FILE\CUSTOMER.DBF")
HDBDescribeField("LASTNAME,C,20")
HDBDescribeField("FIRSTNAME,C,20")
HDBDescribeField("AGE,N,3,0")
HDBDescribeField("BALANCE,N,10,2")
HDBDescribeField("MARRIED,L")
HDBDescribeField("DOB,D")
HDBDescribeField("INFO,M")
HDBCreation()
Sintaxis
<Result> = HDBDescribeFile(<Logical name of xBase file> , <File prefix> , <Full name of physical file>)
<Result>: Boolean - True if the operation was performed,
- False if a problem occurs. HError is used to identify the error.
<Logical name of xBase file>: Character string Logical name of xBase file to create. This name will be used by all the functions that handle xBase files. <File prefix>: Character string File abbreviation (2 characters). <Full name of physical file>: Character string Path where the file will be created on disk and full file name (with the extension). Observaciones Using the EXTERN keyword We recommend that you use the EXTERN keyword to declare a file that will be described and created, in order to avoid warnings in the code editor. For example: EXTERN Customer
HDBDescribeFile("CUSTOMER", "DA", "C:\FILE\CUSTOMER.DBF")
File description - An error 1009 will be generated if the file is already opened during the call to HDBDescribeFile.
- The file will be created on disk by HDBCreation.
- The file structure is described by HDBDescribeField. The number of items created in a file is limited to 128.
- The indexes are described by HDBDescribeIndex.
Limitations This function is not available when using a stand-alone executable.
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