Oracle Database 11 g - Online Public Access Catalog

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468 CHAPTER 11 ■ APPLICATION DEVELOPMENTLOOPFETCH cur into rec;EXIT WHEN cur%NOTFOUND;dbms_output.put_line(rec.header_id||' '||rec.order_total_amt);END LOOP;CLOSE cur;end;Note the following conditionals have been created:• ORDER_TYPE='CREDIT CARD'• ORDER_TOTAL_AMT>100• ORDER_DATE>= 1 May 2007• ORDER_DATE
CHAPTER 11 ■ APPLICATION DEVELOPMENT 469*Cause:*Action:This demonstrates that attempting to convert a cursor to its starting form will now work.OPEN-FOR, EXECUTE IMMEDIATE, and DBMS_SQL.parse() all now accept CLOB arguments,so the former 32KB limit has be lifted. The get_Matching_Orders() function described earlierdemonstrates this new functionality.New Trigger FeaturesThere are three major improvements to triggers in Oracle Database 11g. You now have somecontrol over the order of triggers firing; you can create triggers ENABLED or DISABLED; and thereis a new type of trigger, the compound trigger, that maintains a common state over the life of aDML operation.Trigger Ordering: The FOLLOWS ClauseWhen creating a trigger, a new clause may be included in the CREATE TRIGGER statement. Hereis a snippet showing the new FOLLOWS clause:CREATE TRIGGER B4I_DONATIONS_JOU BEFORE INSERT ON DONATIONSFOLLOWS B4I_DONATIONS_VAL,B4I_DONATIONS_SECWHEN ...This new clause instructs Oracle to call B4I_DONATIONS_JOU after calling the two other triggerslisted in the FOLLOWS clause (B4I_DONATIONS_VAL, B4I_DONATIONS_SEC).Creating Triggers As ENABLED or DISABLEDTwo new keywords, ENABLED and DISABLED, have been added to the trigger creation statement.These mutually exclusive keywords appear immediately before the optional WHEN clause andafter the optional FOLLOWS clause. Here’s the B4I_DONATIONS_JOU trigger created initially disabled:CREATE TRIGGER B4I_DONATIONS_JOU BEFORE INSERT ON DONATIONSFOLLOWS B4I_DONATIONS_VAL,B4I_DONATIONS_SECDISABLEDWHEN ...Compound Triggers TypeIn prior versions of Oracle, to maintain and share data between different triggers on the sametable, a handler package was usually employed to contain global variables holding the “state”for the particular DML operation underway. Although this did work, the fact that the state storedin the package was not bound to the statement being executed meant that the developer hadto ensure that the state was initialized in a BEFORE statement trigger and that any resourcesconsumed, such as collections and cursors, were freed in an AFTER statement trigger. Exceptions, ofcourse, would cause the AFTER statement trigger to not be executed, and any significant resourcesnormally freed by the AFTER statement trigger could be hung up in the trigger’s handler packageuntil the BEFORE statement trigger was called again or the session terminated. A new type of
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The EXPERT’s VOIce ® IN ORACLEAl
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Contents at a GlanceAbout the Autho
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■CONTENTSixSQL*Plus New Features
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■CONTENTSxiEnterprise Manager Int
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■CONTENTSxiiiCombined Capture and
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■CONTENTSxvImprovements in Redo T
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About the Authors■SAM ALAPATI is
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xxii■ACKNOWLEDGMENTSNothing I do
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xxiv■INTRODUCTIONPerformance Mana
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xxvi■INTRODUCTION• The easy add
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xxviii■INTRODUCTION• The flashb
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2 CHAPTER 1 ■ INSTALLING, UPGRADI
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100 CHAPTER 3 ■ DATABASE ADMINIST
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226 CHAPTER 5 ■ DATABASE SECURITY
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266 CHAPTER 6 ■ BACKUP AND RECOVE
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CHAPTER 7■ ■ ■Data PumpDBAs a
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CHAPTER 7 ■ DATA PUMP 315if test
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CHAPTER 7 ■ DATA PUMP 317DBA11g1
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CHAPTER 7 ■ DATA PUMP 319Encrypti
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CHAPTER 7 ■ DATA PUMP 321Please b
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CHAPTER 7 ■ DATA PUMP 323Remappin
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CHAPTER 7 ■ DATA PUMP 325SELECT d
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CHAPTER 7 ■ DATA PUMP 327Document
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CHAPTER 7 ■ DATA PUMP 329SQL> sel
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CHAPTER 7 ■ DATA PUMP 331SQL> sel
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CHAPTER 7 ■ DATA PUMP 333DBMS_OUT
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CHAPTER 7 ■ DATA PUMP 335If you a
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338 CHAPTER 8 ■ ORACLE STREAMSLat
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340 CHAPTER 8 ■ ORACLE STREAMSA s
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342 CHAPTER 8 ■ ORACLE STREAMSSQL
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344 CHAPTER 8 ■ ORACLE STREAMSThe
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346 CHAPTER 8 ■ ORACLE STREAMSStr
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348 CHAPTER 8 ■ ORACLE STREAMSDBM
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350 CHAPTER 8 ■ ORACLE STREAMSPle
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358 CHAPTER 8 ■ ORACLE STREAMSSup
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CHAPTER 9■ ■ ■Storage Managem
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416 CHAPTER 10 ■ DATA GUARD• Lo
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566 ■INDEXadvise failure command,
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568 ■INDEXDBMS_ADDM package, 216-
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600 ■INDEXOracle Audit Vault, 259
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