Stored Programs And Views; Defining Stored Programs - Oracle 5.0 Reference Manual

Chapter 18. Stored Programs and Views
Table of Contents
18.1. Defining Stored Programs ............................................................................................... 1693
18.2. Using Stored Routines (Procedures and Functions) .......................................................... 1694
18.2.1. Stored Routine Syntax ......................................................................................... 1695
18.2.2. Stored Routines and MySQL Privileges ................................................................. 1696
18.2.3. Stored Routine Metadata ...................................................................................... 1696
18.2.4. Stored Procedures, Functions, Triggers, and
18.3. Using Triggers ................................................................................................................ 1697
18.3.1. Trigger Syntax ..................................................................................................... 1697
18.3.2. Trigger Metadata .................................................................................................. 1700
18.4. Using Views ................................................................................................................... 1700
18.4.1. View Syntax ........................................................................................................ 1700
18.4.2. View Processing Algorithms ................................................................................. 1700
18.4.3. Updatable and Insertable Views ........................................................................... 1702
18.4.4. View Metadata ..................................................................................................... 1704
18.5. Access Control for Stored Programs and Views ............................................................... 1704
18.6. Binary Logging of Stored Programs ................................................................................. 1705
This chapter discusses stored programs and views, which are database objects defined in terms of
SQL code that is stored on the server for later execution.
Stored programs include these objects:
• Stored routines, that is, stored procedures and functions. A stored procedure is invoked using the
statement. A procedure does not have a return value but can modify its parameters for later
CALL
inspection by the caller. It can also generate result sets to be returned to the client program. A stored
function is used much like a built-in function. you invoke it in an expression and it returns a value
during expression evaluation.
• Triggers. A trigger is a named database object that is associated with a table and that is activated
when a particular event occurs for the table, such as an insert or update.
Views are stored queries that when referenced produce a result set. A view acts as a virtual table.
This chapter describes how to use stored programs and views. The following sections provide
additional information about SQL syntax for statements related to these objects:
• For each object type, there are CREATE, ALTER, and
exist and how they are defined. See
• The
CALL
• Stored program definitions include a body that may use compound statements, loops, conditionals,
and declared variables. See

18.1. Defining Stored Programs

Each stored program contains a body that consists of an SQL statement. This statement may be a
compound statement made up of several statements separated by semicolon (;) characters. For
example, the following stored procedure has a body made up of a
a statement and a
SET
CREATE PROCEDURE dorepeat(p1 INT)
BEGIN
SET @x = 0;
REPEAT SET @x = @x + 1; UNTIL @x > p1 END REPEAT;
statement is used to invoke stored procedures. See
Section 13.6, "MySQL Compound-Statement
loop that itself contains another
REPEAT
LAST_INSERT_ID()
statements that control which objects
DROP
Section 13.1, "Data Definition
1693
......................... 1697
Statements".
Section 13.2.1, "CALL
Syntax".
block that contains
BEGIN ... END
statement:
SET
Syntax".