Oracle Database PL/SQL Language Reference PDF

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[1] Oracle® Database

PL/SQL Language Reference

11g Release 2 (11.2)

E25519-13

December 2014

Oracle Database PL/SQL Language Reference, 11g Release 2 (11.2)

E25519-13

Primary Author: Sheila Moore

Contributing Author: Eric Belden

Contributors: D. Alpern, E. Belden, S. Agrawal, H. Baer, S. Castledine, T. Chang, B. Cheng, R. Dani, R.

Decker, C. Iyer, A. Kruglikov, S. Kotsovolos, N. Le, W. Li, B. Llewellyn, V. Moore, T. Raney, K. Rich, C.

Wetherell, G. Viswanathan, M. Yang

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Preface............................................................................................................................................................ xxvii

Audience.................................................................................................................................................. xxvii

Documentation Accessibility................................................................................................................ xxvii

Related Documents............................................................................................................................... xxviii

Conventions ........................................................................................................................................... xxviii

Syntax Descriptions............................................................................................................................... xxviii

What's New in PL/SQL?......................................................................................................................... xxix

PL/SQL Feature for Oracle Database 11g Release 2 (11.2.0.2).......................................................... xxix

PL/SQL Features for Oracle Database 11g Release 2......................................................................... xxix

PL/SQL Features for Oracle Database 11g Release 1......................................................................... xxxi

1 Overview of PL/SQL

Advantages of PL/SQL............................................................................................................................ 1-1

Tight Integration with SQL............................................................................................................... 1-1

High Performance.............................................................................................................................. 1-2

High Productivity .............................................................................................................................. 1-2

Portability............................................................................................................................................ 1-3

Scalability ............................................................................................................................................ 1-3

Manageability..................................................................................................................................... 1-3

Support for Object-Oriented Programming................................................................................... 1-3

Support for Developing Web Applications.................................................................................... 1-3

Support for Developing Server Pages............................................................................................. 1-4

Main Features of PL/SQL........................................................................................................................ 1-4

Error Handling ................................................................................................................................... 1-4

Blocks................................................................................................................................................... 1-5

Variables and Constants.................................................................................................................... 1-5

Subprograms....................................................................................................................................... 1-6

Packages .............................................................................................................................................. 1-6

Triggers................................................................................................................................................ 1-6

Input and Output............................................................................................................................... 1-6

Data Abstraction................................................................................................................................. 1-7

Cursors ......................................................................................................................................... 1-7

Composite Variables................................................................................................................... 1-7

%ROWTYPE Attribute............................................................................................................... 1-8

%TYPE Attribute......................................................................................................................... 1-8

Abstract Data Types ................................................................................................................... 1-8

Control Statements............................................................................................................................. 1-8

Conditional Compilation .................................................................................................................. 1-9

Processing a Query Result Set One Row at a Time....................................................................... 1-9

Architecture of PL/SQL........................................................................................................................ 1-10

PL/SQL Engine............................................................................................................................... 1-10

PL/SQL Units and Compilation Parameters.............................................................................. 1-10

2 PL/SQL Language Fundamentals

Character Sets............................................................................................................................................ 2-1

Database Character Set...................................................................................................................... 2-1

National Character Set....................................................................................................................... 2-3

Lexical Units.............................................................................................................................................. 2-3

Delimiters............................................................................................................................................ 2-3

Identifiers ............................................................................................................................................ 2-4

Reserved Words and Keywords............................................................................................... 2-5

Predefined Identifiers................................................................................................................. 2-5

User-Defined Identifiers ............................................................................................................ 2-5

Literals ................................................................................................................................................. 2-8

Comments ........................................................................................................................................ 2-10

Single-Line Comments............................................................................................................ 2-10

Multiline Comments................................................................................................................ 2-10

Whitespace Characters Between Lexical Units........................................................................... 2-11

Declarations............................................................................................................................................ 2-12

Variable Declarations...................................................................................................................... 2-12

Constant Declarations .................................................................................................................... 2-13

Initial Values of Variables and Constants.................................................................................... 2-13

NOT NULL Constraint................................................................................................................... 2-14

%TYPE Attribute............................................................................................................................. 2-15

References to Identifiers...................................................................................................................... 2-16

Scope and Visibility of Identifiers.................................................................................................... 2-17

Assigning Values to Variables........................................................................................................... 2-21

Assigning Values to Variables with the Assignment Statement.............................................. 2-21

Assigning Values to Variables with the SELECT INTO Statement......................................... 2-22

Assigning Values to Variables as Parameters of a Subprogram.............................................. 2-23

Assigning Values to BOOLEAN Variables.................................................................................. 2-23

Expressions............................................................................................................................................. 2-24

Concatenation Operator................................................................................................................. 2-24

Operator Precedence....................................................................................................................... 2-25

Logical Operators............................................................................................................................ 2-27

Short-Circuit Evaluation ................................................................................................................ 2-32

Comparison Operators................................................................................................................... 2-32

IS [NOT] NULL Operator....................................................................................................... 2-33

Relational Operators................................................................................................................ 2-33

LIKE Operator.......................................................................................................................... 2-35

BETWEEN Operator................................................................................................................ 2-36

vii

IN Operator............................................................................................................................... 2-37

BOOLEAN Expressions ................................................................................................................. 2-38

CASE Expressions........................................................................................................................... 2-39

Simple CASE Expression........................................................................................................ 2-39

Searched CASE Expression .................................................................................................... 2-40

SQL Functions in PL/SQL Expressions....................................................................................... 2-41

Error-Reporting Functions................................................................................................................... 2-42

Pragmas................................................................................................................................................... 2-42

Conditional Compilation..................................................................................................................... 2-42

How Conditional Compilation Works......................................................................................... 2-43

Preprocessor Control Tokens................................................................................................. 2-43

Selection Directives.................................................................................................................. 2-44

Error Directives........................................................................................................................ 2-44

Inquiry Directives.................................................................................................................... 2-44

Static Expressions..................................................................................................................... 2-47

Conditional Compilation Examples............................................................................................. 2-51

Retrieving and Printing Post-Processed Source Text................................................................. 2-52

Conditional Compilation Directive Restrictions ........................................................................ 2-53

3 PL/SQL Data Types

SQL Data Types........................................................................................................................................ 3-2

Different Maximum Sizes ................................................................................................................. 3-2

Additional PL/SQL Constants for BINARY_FLOAT and BINARY_DOUBLE........................ 3-2 Additional PL/SQL Subtypes of BINARY_FLOAT and BINARY_DOUBLE........................... 3-3

CHAR and VARCHAR2 Variables.................................................................................................. 3-3

Assigning or Inserting Too-Long Values ................................................................................ 3-3

Declaring Variables for Multibyte Characters........................................................................ 3-4

Differences Between CHAR and VARCHAR2 Data Types.................................................. 3-5

LONG and LONG RAW Variables................................................................................................. 3-6

ROWID and UROWID Variables.................................................................................................... 3-6

BOOLEAN Data Type............................................................................................................................. 3-7

PLS_INTEGER and BINARY_INTEGER Data Types...................................................................... 3-8

Preventing PLS_INTEGER Overflow.............................................................................................. 3-8

Predefined PLS_INTEGER Subtypes.............................................................................................. 3-9

SIMPLE_INTEGER Subtype of PLS_INTEGER.......................................................................... 3-10

SIMPLE_INTEGER Overflow Semantics ............................................................................. 3-10

Expressions with Both SIMPLE_INTEGER and Other Operands.................................... 3-11

Integer Literals in SIMPLE_INTEGER Range...................................................................... 3-11

User-Defined PL/SQL Subtypes......................................................................................................... 3-11

Unconstrained Subtypes................................................................................................................ 3-12

Constrained Subtypes..................................................................................................................... 3-12

Subtypes with Base Types in Same Data Type Family.............................................................. 3-14

4 PL/SQL Control Statements

Conditional Selection Statements......................................................................................................... 4-1

IF THEN Statement............................................................................................................................ 4-2

viii

IF THEN ELSE Statement ................................................................................................................. 4-3

IF THEN ELSIF Statement ................................................................................................................ 4-5

Simple CASE Statement.................................................................................................................... 4-6

Searched CASE Statement ................................................................................................................ 4-7

LOOP Statements..................................................................................................................................... 4-9

Basic LOOP Statement....................................................................................................................... 4-9

EXIT Statement................................................................................................................................ 4-10

EXIT WHEN Statement.................................................................................................................. 4-10

CONTINUE Statement................................................................................................................... 4-12

CONTINUE WHEN Statement..................................................................................................... 4-13

FOR LOOP Statement..................................................................................................................... 4-14

FOR LOOP Index..................................................................................................................... 4-16

Lower Bound and Upper Bound........................................................................................... 4-18

EXIT WHEN or CONTINUE WHEN Statement in FOR LOOP Statement..................... 4-19

WHILE LOOP Statement............................................................................................................... 4-20

Sequential Control Statements........................................................................................................... 4-21

GOTO Statement............................................................................................................................. 4-21

NULL Statement.............................................................................................................................. 4-24

5 PL/SQL Collections and Records

Collection Types....................................................................................................................................... 5-2

Associative Arrays.................................................................................................................................... 5-4

Declaring Associative Array Constants.......................................................................................... 5-6

NLS Parameter Values Affect Associative Arrays Indexed by String........................................ 5-7

Changing NLS Parameter Values After Populating Associative Arrays............................ 5-7

Indexes of Data Types Other Than VARCHAR2................................................................... 5-7

Passing Associative Arrays to Remote Databases.................................................................. 5-8

Appropriate Uses for Associative Arrays....................................................................................... 5-8

Varrays (Variable-Size Arrays).............................................................................................................. 5-8

Appropriate Uses for Varrays....................................................................................................... 5-10

Nested Tables......................................................................................................................................... 5-10

Important Differences Between Nested Tables and Arrays ..................................................... 5-13

Appropriate Uses for Nested Tables............................................................................................ 5-13

Collection Constructors........................................................................................................................ 5-14

Assigning Values to Collection Variables........................................................................................ 5-15

Data Type Compatibility................................................................................................................ 5-15

Assigning Null Values to Varray or Nested Table Variables................................................... 5-16

Assigning Set Operation Results to Nested Table Variables.................................................... 5-16

Multidimensional Collections............................................................................................................ 5-18

Collection Comparisons....................................................................................................................... 5-19

Comparing Varray and Nested Table Variables to NULL........................................................ 5-20

Comparing Nested Tables for Equality and Inequality ............................................................ 5-20

Comparing Nested Tables with SQL Multiset Conditions....................................................... 5-21

Collection Methods............................................................................................................................... 5-22

DELETE Collection Method .......................................................................................................... 5-23

TRIM Collection Method ............................................................................................................... 5-26

EXTEND Collection Method......................................................................................................... 5-27

EXISTS Collection Method............................................................................................................. 5-28

FIRST and LAST Collection Methods .......................................................................................... 5-29

FIRST and LAST Methods for Associative Array............................................................... 5-29

FIRST and LAST Methods for Varray................................................................................... 5-31

FIRST and LAST Methods for Nested Table........................................................................ 5-32

COUNT Collection Method........................................................................................................... 5-33

COUNT Method for Varray................................................................................................... 5-33

COUNT Method for Nested Table........................................................................................ 5-34

LIMIT Collection Method .............................................................................................................. 5-35

PRIOR and NEXT Collection Methods........................................................................................ 5-36

Collection Types Defined in Package Specifications.................................................................... 5-38

Record Variables................................................................................................................................... 5-39

Initial Values of Record Variables ................................................................................................ 5-40

Declaring Record Constants.......................................................................................................... 5-40

RECORD Types............................................................................................................................... 5-41

%ROWTYPE Attribute................................................................................................................... 5-44

Record Variable that Always Represents Full Row............................................................ 5-44

Record Variable that Can Represent Partial Row ............................................................... 5-45

%ROWTYPE Attribute and Virtual Columns...................................................................... 5-47

Assigning Values to Record Variables.............................................................................................. 5-48

Assigning One Record Variable to Another................................................................................ 5-48

quotesdbs_dbs17.pdfusesText_23

[PDF] Oracle Database PL/SQL Language Reference

What do you type after you enter PL/SQL mode?

What is Oracle SQL?

How many transactions are in a PL/SQL block?

How do I get access to an Oracle Database?

PL/SQL Language Reference

11g Release 2 (11.2)

E25519-13

December 2014

E25519-13

Primary Author: Sheila Moore

Contributing Author: Eric Belden

Wetherell, G. Viswanathan, M. Yang

Oracle.

Contents

1 Overview of PL/SQL

2 PL/SQL Language Fundamentals

3 PL/SQL Data Types

4 PL/SQL Control Statements

5 PL/SQL Collections and Records