Oracle SQL Developer

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Handling PL/SQL ErrorsIf you redeclare a global exception in a sub-block, the local declaration prevails. Thesub-block cannot reference the global exception, unless the exception is declared in alabeled block and you qualify its name with the block label:block_label.exception_nameExample 7–30 illustrates the scope rules:Example 7–30Scope of PL/SQL ExceptionsDECLAREpast_due EXCEPTION;acct_num NUMBER;BEGINDECLARE ---------- sub-block beginspast_due EXCEPTION; -- this declaration prevailsacct_num NUMBER;due_date DATE := SYSDATE - 1; -- set on purpose to raise exceptiontodays_date DATE := SYSDATE;BEGINIF due_date < todays_date THENRAISE past_due; -- this is not handledEND IF;END; ------------- sub-block endsEXCEPTIONWHEN past_due THEN -- does not handle raised exceptionDBMS_OUTPUT.PUT_LINE('Handling PAST_DUE exception.');WHEN OTHERS THENDBMS_OUTPUT.PUT_LINE('Could not recognize PAST_DUE_EXCEPTION in this scope.');END;/The enclosing block does not handle the raised exception because the declaration ofpast_due in the sub-block prevails. Though they share the same name, the twopast_due exceptions are different, just as the two acct_num variables share the samename but are different variables. Thus, the RAISE statement and the WHEN clause referto different exceptions. To have the enclosing block handle the raised exception, youmust remove its declaration from the sub-block or define an OTHERS handler.7.4.5 Continuing After an Exception is RaisedBy default, you put an exception handler at the end of a subprogram to handleexceptions that are raised anywhere inside the subprogram. To continue executingfrom the spot where an exception happens, enclose the code that might raise anexception inside another BEGIN-END block with its own exception handler. Forexample, you might put separate BEGIN-END blocks around groups of SQL statementsthat might raise NO_DATA_FOUND, or around arithmetic operations that might raiseDIVIDE_BY_ZERO. By putting a BEGIN-END block with an exception handler inside aloop, you can continue executing the loop even if some loop iterations raiseexceptions.You can still handle an exception for a statement, then continue with the nextstatement. Place the statement in its own sub-block with its own exception handlers. Ifan error occurs in the sub-block, a local handler can catch the exception. When thesub-block ends, the enclosing block continues to execute at the point where thesub-block ends, as shown in Example 7–31.7-24 SQL Developer Online Help
Handling PL/SQL ErrorsExample 7–31Continuing After an Exception-- create a temporary table for this exampleCREATE TABLE employees_temp ASSELECT employee_id, salary, commission_pct FROM employees;DECLAREsal_calc NUMBER(8,2);BEGININSERT INTO employees_temp VALUES (303, 2500, 0);BEGIN -- sub-block beginsSELECT salary / commission_pct INTO sal_calc FROM employees_tempWHERE employee_id = 303;EXCEPTIONWHEN ZERO_DIVIDE THENsal_calc := 2500;END; -- sub-block endsINSERT INTO employees_temp VALUES (304, sal_calc/100, .1);EXCEPTIONWHEN ZERO_DIVIDE THENNULL;END;/-- view the resultsSELECT * FROM employees_temp WHERE employee_id = 303 OR employee_id = 304;-- drop the temporary tableDROP TABLE employees_temp;In this example, if the SELECT INTO statement raises a ZERO_DIVIDE exception, thelocal handler catches it and sets sal_calc to 2500. Execution of the handler iscomplete, so the sub-block terminates, and execution continues with the INSERTstatement.PL/SQL: Usage Information 7-25
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Oracle SQL DeveloperOnline HelpRele
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Contents1 SQL Developer Concepts an
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3.12 Create/Edit Index ............
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6.3.2 Updating Data With the UPDATE
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10.2.5 SQL*Plus SET Commands.......
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SQL Developer User InterfaceThe men
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SQL Developer User InterfaceThe Com
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Database Objects1.2 Database Object
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Database Objectscontaining the mast
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Database Objects■■■■■■
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Database ConnectionsWhen you start
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Running and Debugging Functions and
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Using the SQL WorksheetRelated Topi
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Using the SQL WorksheetScript Runne
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Using the SQL Worksheetmentioned in
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Reports1.9 ReportsRelated TopicsRun
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Reports1.9.3 Table reportsTable rep
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Reportsissues and vulnerabilities,
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SQL Developer Preferencesand the SQ
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SQL Developer Preferences1.10.3 Cod
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SQL Developer PreferencesSQL Develo
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SQL Developer User Information: Loc
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Supplementary Oracle Database Infor
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Creating a Table (Books)the table t
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Creating a Table (Transactions)Colu
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Creating a SequenceName: for_key_bo
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Creating a PL/SQL Procedure2.6 Crea
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Using the SQL Worksheet for Queries
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Script for Creating and Using the L
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Script for Creating and Using the L
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Check for UpdatesTo remove the effe
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Select Library3.8 Select LibraryThi
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Create PL/SQL Function, Procedure,
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Create Table (quick creation)Relate
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Create/Edit Table (with advanced op
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Create Type (User-Defined)For more
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Create/Edit ViewTest Syntax: Checks
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Configure File Type AssociationsDia
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Find/Replace TextTo add a type of o
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Save/Save As3.37 Save/Save As3.38 S
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SQL*Plus Location3-28 SQL Developer
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Managing TablesTo include lowercase
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Managing Tables4.2.4 Column Constra
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Managing Indexes4.3 Managing Indexe
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Managing Indexesuseful when all of
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Managing Views4.4 Managing Views4.3
Page 100 and 101: Managing Synonyms4-12 SQL Developer
Page 102 and 103: Storing Numeric Data■■NCHAR and
Page 104 and 105: Storing Numeric DataThe absence of
Page 106 and 107: Storing Datetime Data5.4.1.2 Using
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Page 110 and 111: Retrieving Data With Queries■■
Page 112 and 113: Retrieving Data With QueriesSee Als
Page 114 and 115: Retrieving Data With QueriesSee Als
Page 116 and 117: Transaction Control Statements6.3.2
Page 118 and 119: Using Pseudocolumns, Sequences, and
Page 124 and 125: Using SQL Data Definition Language
Page 126 and 127: Using SQL Data Definition Language
Page 128 and 129: Entering and Executing PL/SQL CodeY
Page 130 and 131: Utilizing the Main Features of PL/S
Page 148 and 149: Handling PL/SQL ErrorsTo handle une
Page 152 and 153: Handling PL/SQL Errors7-26 SQL Deve
Page 154 and 155: Overview of Packages and Subprogram
Page 156 and 157: Managing Packagescalling procedures
Page 158 and 159: Oracle Product-Specific PackagesTab
Page 160 and 161: Oracle Product-Specific PackagesTab
Page 162 and 163: Oracle Product-Specific Packages8-1
Page 164 and 165: Overview of Triggers9.1.1 Types of
Page 166 and 167: Overview of Triggers■■A trigger
Page 168 and 169: Designing TriggersNote: A procedure
Page 170 and 171: Using SQL*Plus■■■Running Scri
Page 172 and 173: Using SQL*PlusA SQL script file is
Page 174 and 175: Using SQL*Plus10-6 SQL Developer On
Page 176 and 177: Overview of Globalization Support
Page 178 and 179: Setting up the Globalization Suppor
Page 192 and 193: SQL and PL/SQL Programming with Uni
Page 194 and 195: SQL and PL/SQL Programming with Uni
Page 196 and 197: Locale-Dependent SQL Functions with
Page 198 and 199: Locale-Dependent SQL Functions with
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COLLECTION_IS_NULL exception, 7-22c
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overview, 7-14EXPLAIN PLANexecution
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NLSSORT SQL function, 11-21NO_DATA_
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displaying output from PL/SQL, 7-9s
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disabling, 9-4enabling, 9-4error co
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Oracle SQL Developer

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