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WhatisSQL"IFEXISTS"

• Testsifthesubselect producesanyrows• Ifrowsarereturned,theIFtestistrue• Ifnorowsarereturned,theIFtestisfalse• SQLUDFsand"stored"ProceduressupportIFExiststests• SQLiQuerySupportsIFExiststests• WhataboutRPG?

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IfarecordexiststhatmatchestheWHEREclause,thenDO.

RPGIVIFExists

5770ST1 V7R3M0 160422 Create SQL ILE RPG Object IFEXISTSDIAGNOSTIC MESSAGES

4 EXEC SQL IF EXISTS (SELECT * FROM DATALIB.ORDHIST 5770ST1 V7R3M0 160422 Create SQL ILE RPG Object IFEXISTS

DIAGNOSTIC MESSAGESMSG ID SEV RECORD TEXT SQL0199 30 4 Position 22 Keyword IF not expected. Valid tokens: ( CL

END GET SET CALL DROP FREE HOLD LOCK OPEN WITH ALTER BEGIN.

WhatCanWeDoinRPG?

• RPGIVdoesnotsupportIFEXISTS• UsingRPGandSQLwecanworkaroundthislimitation

HowtoCode"IFEXISTS"inRPGIVwithSQL

• IFEXISTSdoesnotexistinRPG• HoweverRPGdoeshaveIFstatementitself

• RPGsupportstheSQLWHEREEXISTSclause• WecancombinedRPGwithSQLtosimulatethe"IFEXISTS"condition

IFEXISTSinRPG

1.Addan"IfExists"flag(indicatorvariable)

2.SELECT'1'INTOthatvariablefromSYSDUMMY1

3.NesttheEXISTSclausewithintheWHEREclause

4.TesttheExistsvariablefortrue(*ON)condition

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