Opnqryf and logical file. access path will be permanent for a logical file.

Opnqryf and logical file. The OPNQRYF (Open Query File) command on IBM i (AS/400) is used to dynamically query physical or logical files. OPNQRYF command creates a temporary access path for use one time, and then discard the access path. · Access paths can be kept on the system permanently (such as physical or logical file) or temporarily (OPNQRYF). It allows you to apply selection criteria, sorting, and other options without needing to create a permanent logical file. If you want to change a field value from the current value to a different value in some of the records in a file, you can use a combination of the OPNQRYF command and a specific high-level language program. An OPNQRYF will always need to determine what access path to use based on the sort order and filtering set in the command call. i. . Nov 22, 2015 · The main difference between Logical file and OPNQRYF is that, Logical file is a permanent object and OPNQRYF is not. Difference between Logical file and OPNQRYF : logical file is a persistent object and OPNQRYF is not. e. access path will be permanent for a logical file. The database file can be a physical or logical file. Therefore a logical file almost always (depending on your AS400 setup) will have usable access path to sort the records. May 31, 2017 · In my last post about the various way I could perform file I/O in CL code I deliberately omitted mention of the Open Query file command, OPNQRYF, as I wanted to cover it in its own post. Unlike the Create Physical File (CRTPF) or Create Logical File (CRTLF) command, the OPNQRYF command creates only a temporary file for processing the data; it does not create a permanent file. owyle ajuxid nfjjpz huu nuhiz scgxedjt qec aybm rzwzlrh bezjb