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Oracle PL/SQL Programming: A Developer's Workbook
book

Oracle PL/SQL Programming: A Developer's Workbook

by Steven Feuerstein, Andrew Odewahn
May 2000
Intermediate to advanced content levelIntermediate to advanced
594 pages
11h 32m
English
O'Reilly Media, Inc.
Content preview from Oracle PL/SQL Programming: A Developer's Workbook

Chapter 21. DBMS_SQL Built-in Package

Beginner

Q:

21-1.

Dynamic SQL means that the SQL string, whether it be a SELECT statement or a DDL statement like CREATE TABLE, is constructed as the program is running, rather than when it is compiled.

Q:

21-2.

Dynamic PL/SQL means that the PL/SQL block of code is constructed as the program is running, rather than when it is compiled.

Q:

21-3.

The four methods of dynamic SQL are:

Method 1

Non-queries (DDL and DML—inserts, updates, deletes) that do not have any placeholders (do not bind any variables from the calling program).

Method 2

Nonqueries (DDL and DML—inserts, updates, deletes) that contain a fixed (at compile time) number of placeholders.

Method 3

Queries (SELECT statements) that contain a fixed (at compile time) number of columns and placeholders.

Method 4

Queries and DML statements that contain a variable number of columns and/or placeholders. There is no way to know, in other words, until runtime just how many columns you are querying or placeholders you are binding to variables.

Q:

21-4.

A placeholder is an identifier (maximum of 30 characters, must start with a letter, and then may contain letters, numbers, or any of the characters #, $ and _) preceded by a colon, appearing inside a literal string, as in:

'SELECT latest_excuse
   FROM pentagon
  WHERE budget_overrun > :amount'

In this string, “:amount” is a placeholder, which means you have to “bind” a value to that placeholder before you can execute the query. Notice that I have embedded line breaks inside ...

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Publisher Resources

ISBN: 9781449324070Supplemental ContentErrata Page