The features described in this topic are obsolete
and should not be used in new IDL code.

READ/READF

The following keywords to the READ procedures are obsolete.

VMS Keywords

Note also that the obsolete VMS-only routine READ_KEY has been replaced by the keywords below.

KEY_ID

The index key to be used (primary = 0, first alternate key = 1, etc...) when accessing data from a file with indexed organization. If this keyword is omitted, the primary key is used.

KEY_MATCH

The relation to be used when matching the supplied key with key field values (EQ = 0, GE = 1, GT = 2) when accessing data from a file with indexed organization. If this keyword is omitted, the equality relation (0) is used.

KEY_VALUE

The value of a key to be found when accessing data from a file with indexed organization. This value must match the key definition that is determined when the file was created in terms of type and size—no conversions are performed. If this keyword is omitted, the next sequential record is used.