DDM files and SQL
You can use IBM® i distributed data management (DDM) support to help you do some distributed relational database tasks within a program that also uses SQL distributed relational database support.
It might be faster, for example, for you to use DDM and the Copy File (CPYF) command to get a large number of records rather than an SQL FETCH statement. Also, DDM can be used to get external file descriptions of the remote system data brought in during compilation for use with the distributed relational database application. To do this, you need to use DDM as described in Initial setup.
The following example shows how you can add a relational database
directory entry and create a DDM file so that the same job can be
used on the server and client.
Notes:
- Either both connections must be protected or both connections must be unprotected for the conversation to be shared.
- By using the code examples, you agree to the terms of the Code license and disclaimer information.
Relational Database Directory:
ADDRDBDIRE RDB(KC000) +
RMTLOCNAME(KC000)
TEXT('Kansas City regional database')
DDM File:
CRTDDMF FILE(SPIFFY/UPDATE)
RMTFILE(SPIFFY/INVENTORY)
RMTLOCNAME(KC000)
TEXT('DDM file to update local orders')
Here is a sample program that uses both the relational database directory entry and the DDM file in the same job on the remote system:
CRTSQLxxx PGM(PARTS1) COMMIT(*CHG) RDB(KC000) RDBCNNMTH(*RUW)
PROC :PARTS1;
OPEN SPIFFY/UPDATE;
.
.
.
CLOSE SPIFFY/UPDATE;
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.
.
EXEC SQL
SELECT * INTO :PARTAVAIL
FROM INVENTORY
WHERE ITEM = :PARTNO;
EXEC SQL
COMMIT;
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.
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END PARTS1;