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PLsql语法大全
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Oracle® Database
PL/SQL Language Reference
11g Release 2 (11.2)
E25519-07
January 2013
Oracle Database PL/SQL Language Reference, 11g Release 2 (11.2)
E25519-07
Copyright © 1996, 2013, Oracle and/or its affiliates. All rights reserved.
Primary Author: Sheila Moore
Contributing Author: Eric Belden
Contributors: S. Agrawal, C. Barclay, D. Bronnikov, S. Castledine, T. Chang, B. Cheng, R. Dani, R. Decker,
C. Iyer, S. Kotsovolos, N. Le, W. Li, S. Lin, B. Llewellyn, D. Lorentz, V. Moore, K. Muthukkaruppan, C.
Racicot, K. Rich, J. Russell, C. Wetherell, M. Vemulapati, G. Viswanathan, M. Yang
This software and related documentation are provided under a license agreement containing restrictions on
use and disclosure and are protected by intellectual property laws. Except as expressly permitted in your
license agreement or allowed by law, you may not use, copy, reproduce, translate, broadcast, modify, license,
transmit, distribute, exhibit, perform, publish, or display any part, in any form, or by any means. Reverse
engineering, disassembly, or decompilation of this software, unless required by law for interoperability, is
prohibited.
The information contained herein is subject to change without notice and is not warranted to be error-free. If
you find any errors, please report them to us in writing.
If this is software or related documentation that is delivered to the U.S. Government or anyone licensing it
on behalf of the U.S. Government, the following notice is applicable:
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This software or hardware and documentation may provide access to or information on content, products,
and services from third parties. Oracle Corporation and its affiliates are not responsible for and expressly
disclaim all warranties of any kind with respect to third-party content, products, and services. Oracle
Corporation and its affiliates will not be responsible for any loss, costs, or damages incurred due to your
access to or use of third-party content, products, or services.
v
Contents
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
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