Application Programming and SQL Guide - Kmlinux

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Flexibility of dynamic SQL . . . . . . . . . . . . . . . . . . . 544
Limitations of dynamic SQL . . . . . . . . . . . . . . . . . . . 544
Dynamic SQL processing . . . . . . . . . . . . . . . . . . . 544
Performance of static and dynamic SQL . . . . . . . . . . . . . . 545
Caching dynamic SQL statements . . . . . . . . . . . . . . . . . 546
Using the dynamic statement cache . . . . . . . . . . . . . . . . 547
Using the statement cache table . . . . . . . . . . . . . . . . . 549
Keeping prepared statements after commit points . . . . . . . . . . 549
Limiting dynamic SQL with the resource limit facility . . . . . . . . . . . 551
Writing an application to handle reactive governing . . . . . . . . . . 552
Writing an application to handle predictive governing . . . . . . . . . 552
Using predictive governing and down-level DRDA requesters . . . . . . 552
Using predictive governing and enabled requesters . . . . . . . . . . 553
Choosing a host language for dynamic SQL applications . . . . . . . . . 553
Dynamic SQL for non-SELECT statements . . . . . . . . . . . . . . 553
Dynamic execution using EXECUTE IMMEDIATE . . . . . . . . . . . 554
Dynamic execution using PREPARE and EXECUTE . . . . . . . . . 555
Dynamic execution of a multiple-row INSERT statement . . . . . . . . 557
Using DESCRIBE INPUT to put parameter information in an SQLDA . . . 559
Dynamic SQL for fixed-list SELECT statements . . . . . . . . . . . . 560
Declaring a cursor for the statement name . . . . . . . . . . . . . 561
Preparing the statement . . . . . . . . . . . . . . . . . . . . 561
Opening the cursor . . . . . . . . . . . . . . . . . . . . . . 562
Fetching rows from the result table . . . . . . . . . . . . . . . . 562
Closing the cursor . . . . . . . . . . . . . . . . . . . . . . 562
Dynamic SQL for varying-list SELECT statements . . . . . . . . . . . 562
What your application program must do . . . . . . . . . . . . . . 562
Preparing a varying-list SELECT statement . . . . . . . . . . . . . 563
Executing a varying-list SELECT statement dynamically . . . . . . . . 572
Executing arbitrary statements with parameter markers . . . . . . . . 573
How bind options REOPT(ALWAYS) and REOPT(ONCE) affect dynamic
SQL . . . . . . . . . . . . . . . . . . . . . . . . . . 575
Using dynamic SQL in COBOL . . . . . . . . . . . . . . . . . . 576
Chapter 25. Using stored procedures for client/server processing . . . . 577
Introduction to stored procedures . . . . . . . . . . . . . . . . . . 577
An example of a simple stored procedure . . . . . . . . . . . . . . 578
Setting up the stored procedures environment . . . . . . . . . . . . . 582
Defining your stored procedure to DB2 . . . . . . . . . . . . . . 583
Refreshing the stored procedures environment (for system administrators) 587
Moving stored procedures to a WLM-established environment (for system
administrators) . . . . . . . . . . . . . . . . . . . . . . . 588
Writing and preparing an external stored procedure . . . . . . . . . . . 589
Language requirements for the stored procedure and its caller . . . . . . 590
Calling other programs . . . . . . . . . . . . . . . . . . . . 590
Using reentrant code . . . . . . . . . . . . . . . . . . . . . 590
Writing a stored procedure as a main program or subprogram . . . . . . 591
Restrictions on a stored procedure . . . . . . . . . . . . . . . . 594
Using COMMIT and ROLLBACK statements in a stored procedure . . . . 594
Using special registers in a stored procedure . . . . . . . . . . . . 595
Accessing other sites in a stored procedure . . . . . . . . . . . . . 597
Writing a stored procedure to access IMS databases . . . . . . . . . 598
Writing a stored procedure to return result sets to a DRDA client . . . . . 598
Preparing a stored procedure . . . . . . . . . . . . . . . . . . 600
Binding the stored procedure . . . . . . . . . . . . . . . . . . 601
Writing a REXX stored procedure . . . . . . . . . . . . . . . . 602
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