KEY_EXIST Function
Syntax
Arguments
- tagname
The name of an index tag that may contain the Key_Value. The Index_Tag parameter can include a full drive and path specification. If you omit the drive and path, Alpha Anywhere searches the current directory.
- keyvalue
A string constant, character variable, or an expression that returns a character value.
Description
Returns TRUE if a specified key value is found in a specified index.
Discussion
KEY_EXIST() returns .T. (TRUE) if Key_Value is found in index Index_Tag ; otherwise, it returns .F. (FALSE). This function is useful for checking if a record with a certain key value already exists in the primary table. Note : If you want to define a Validation Field Rule to prevent the entry of a duplicate record, use KEY_UNIQUE(), not KEY_EXIST().
Assume that the following table is indexed on the NAME field, and the index is stored under the tag name "NAMEORD".
- Customer
- Cust ID
Name
- C100
InSync
- C101
ACE Software
- C102
Friendlies
- C103
Sunstar
- C104
Progress Inc.
- C105
Adventure Holidays
? key_exist("NAMEORD", "InSync")
= .T.
? key_exist("NAMEORD", "Alpha")
= .F.See Also