What is CHAIN e in rpgle?

What is CHAIN e in rpgle?

The CHAIN command does a SETLL and a READE in order to find a match. CHAIN is best used to locate a unique record (like a customer record) from a full procedural file. To handle CHAIN exceptions (file status codes greater than 1000), either the operation code extender ‘E’ or an error indicator at LO level can be used.

How do you use a chain in Rpgle?

If the file is an externally-described file, search-arg can also be a composite key in the form of a KLIST name, a list of values, or %KDS. For keys specified using a KLIST, key fields must have the same CCSID as the key in the file.

What is Setll Rpgle?

SETLL sets the file pointer at the first occurrence of the record where the key field/RRN value is greater than or equal to the factor-1 search argument value. After positioning the file pointer we can go for any file operation e.g. READ, READP,READPE, READE.

What is Reade in Rpgle?

READE reads the matching record for factor-1 and moves the pointer to the next record with the same matching criteria. If the same matching criteria is not found then it foes to EOF. If there are no records with the specified criteria then the pointer will be set to EOF.

How do you unlock a record in Rpgle?

§ The current locked is unlocked on subsequent read operation i.e. when we read another record the previous read operation record lock will be unlocked. § The current locked record is automatically unlocked when the UPDATE operation performed on the record is over.

How do you handle a record lock in Rpgle?

Follow below steps to handle record lock:

1. Login to Green Screen.
2. Enter command WRKACTJOB.
3. Search for the job which is in ‘MSGW’ status.
4. Take option 7=Display Message.
5. Note down the file name and library mentioned in the error message.
6. Press F10=Display messages in job log.

How do you update Rpgle files?

Update operation on a subfile is performed to update the subfile with changes in the subfile attribute e.g. change in display attribute/indicators. For partial updating a file, we can use %FIELDS or EXCEPT. If we use a data structure in result field then the file is directly updated from the data structure.

What is Exfmt?

The EXFMT operation is a combination of a WRITE followed by a READ to the same record format. The format-name operand must be the name of the record format to be written and then read. If the data-structure operand is specified, the record is written from and read into the data structure.

What is Setll?

name (file or record format) NR. ER. EQ. The SETLL operation positions a file at the next record that has a key or relative record number that is greater than or equal to the search argument (key or relative record number) operand specified (search-arg).

What is the use of Ovrdbf in as400?

OVRDBF (Override with Database File) Command in CL. This command is used to override the attribute of a physical file. By using this command we can make our program to use some other file for the one actually named to be used in the program.

What is the difference between Reade and chain?

The CHAIN command does a SETLL and a READE in order to find a match. CHAIN is best used to locate a unique record (like a customer record). For example, you can find multiple customer orders in your system for one unique customer. In case of CHAIN, the file operation is used to randomly retrieve a record from a file.

How do I read Rpgle files?

READ opcode in rpgle-go4as400.com. Read operation reads the records of a full procedural file. First of all it reads the record where currently the pointer is and then advances the pointer to the next record. The READ operation applies a record lock to files that are open in update mode.