This function will return the data value of a field, given the name of the file, the record key, the field number, and an action code. It takes the general form:
TRANS ([DICT] filename, key, field#, action.code)
DICT is the literal string to be placed before the file name in the event it is desired to open the dictionary portion of the file, rather than the data portion.
filename is a string containing the name of the file to be accessed. Note that it is the actual name of the file, and not a file unit variable. This function requires the file name, regardless of whether or not the file has been opened to a file unit variable.
key is an expression that evaluates to the record key, or item ID, of the record from which data is to be accessed.
field# is the field number to be retrieved from the record.
action.code indicates what should happen if the field is null, or the if record is not found. This is a literal. The valid codes are:
|X||Returns a null string. This is the default action|
|V||Prints an error message|
|C||Returns the value of ke|
If the field being accessed is a dynamic array, TRANS will return the array with the delimiter characters lowered by 1. For example, multivalue marks (ASCII-253) are returned as subvalue marks (ASCII-252), and subvalue marks are returned as text marks (ASCII-251).
If -1 is supplied for field#, the entire record will be returned.
The TRANS function is the same as the XLATE function.
An example of use is the retrieval of a simple field: Given a file called "VENDORS" containing a record with the record key of "12345" and which contains the value of "ABC Company" in field 1, accomplished as follows:
VENDOR.ID = "12345" VENDOR.NAME = TRANS ("VENDORS",VENDOR.ID,1,"X") CRT VENDOR.NAME
to display: ABC Company
Another is the retrieval of an array: Suppose field 6 of the VENDORS file contains a multivalued list of purchase order numbers, such as 10011]10062]10079 use the TRANS function to retrieve it as :
PO.LIST = TRANS ("VENDORS",VENDOR.ID,6,"X") CRT PO.LIST
to display: 10011\10062\10079
Note that the backslashes (\) were substituted for brackets (]), indicating that the delimiter is now CHAR(252).
Yet another example would be the retrieval of an entire dictionary item: Given a dictionary item called "VENDOR.NAME" with the following content:
001 A 002 1 003 Vendor Name 004 005 006 007 008 009 L 010 30
DICT.ID = "VENDOR.NAME" DICT.REC = TRANS ("DICT VENDORS",VENDOR.ID,-1,"C") PRINT DICT.REC
See also: XLATE.
Go back to jBASE BASIC.