PL/SQL User’s Guide and Reference phần 6 docx
PL/SQL User’s Guide and Reference phần 6 docx
... the
values 6 and 8 to attributes num and den, respectively.
DECLARE
r Rational;
BEGIN
r := Rational (6, 8);
DBMS_OUTPUT.PUT_LINE(r.num); prints 6
What Is an Object Type?
9-4 PL/SQL User’s Guide and Reference
Next, ... Types
9-20 PL/SQL User’s Guide and Reference
Object Type
Rational
A rational number is a number expressible as the quotient of two integers, a
num...
PL/SQL User’s Guide and Reference phần 1 pdf
... not
grant them access to the table itself.
Advantages of PL/SQL
1-24 PL/SQL User’s Guide and Reference
Main Features
1-10 PL/SQL User’s Guide and Reference
Iterative Control
LOOP statements let you ... Routines 5 -63
Use the NOCOPY Compiler Hint 5 -64
Use the RETURNING Clause 5 -64
PL/SQL
User’s Guide and Reference
Release 8.1 .6
December 1999
Part No. A77 0...
PL/SQL User’s Guide and Reference phần 2 doc
... LOOP and EXIT Statements
3 -6 PL/SQL User’s Guide and Reference
When possible, use the ELSIF clause instead of nested IF statements. That way,
your code will be easier to read and understand. ... of EXIT statements: EXIT and EXIT-WHEN.
Scope and Visibility
2-38 PL/SQL User’s Guide and Reference
In such cases, to avoid ambiguity, prefix the names of local variables...
PL/SQL User’s Guide and Reference phần 3 pdf
... course_no = 3105;
END;
Taking Advantage of Bulk Binds
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Each context switch between the PL/SQL and SQL engines adds to overhead. So, if
many switches are ... Course( 360 1, ’Latin America Since 1825’, 4),
Course(3702, ’Medieval Islamic History’, 4)));
Manipulating Records
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Using Collection Me...
PL/SQL User’s Guide and Reference phần 4 pptx
... Variables
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Cursor variables follow the usual scoping and instantiation rules. Local PL/SQL
cursor variables are instantiated when you enter a block or subprogram and ... cursor variable and pass it as a parameter to
local and stored subprograms. This gives you an easy way to centralize data
retrieval.
Using Cursor Variables
5-22 PL/SQ...
PL/SQL User’s Guide and Reference phần 5 ppsx
... subprogram.
You can avoid unhandled exceptions by coding an OTHERS handler at the topmost
level of every PL/SQL program.
User-Defined Exceptions
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BEGIN
IF THEN
... EXCEPTION_INIT(deadlock_detected, -60 );
Understanding Parameter Aliasing
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Understanding Parameter Aliasing
To optimize a subpro...
PL/SQL User’s Guide and Reference phần 7 ppt
... list.
Tips and Traps
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Tips and Traps
Native Dynamic SQL 10-11
Tips and Traps
This section shows you how to take full advantage of dynamic SQL and how to
avoid ... ;
assignment_statement
Blocks
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Blocks
The basic program unit in PL/SQL is the block. A PL/SQL block is defined by the
key...
PL/SQL User’s Guide and Reference phần 8 pptx
... error_number ) ;
exception_init_pragma
Exceptions
11 -60 PL/SQL User’s Guide and Reference
Example
The following PL/SQL block has two exception handlers:
DECLARE
bad_emp_id EXCEPTION;
bad_acct_no ... expression AND expression
IN ( expression
,
)
other_boolean_form
Functions
11- 86 PL/SQL User’s Guide and Reference
datatype
This is a type specifier. For the syntax of...
PL/SQL User’s Guide and Reference phần 9 doc
... SERIALLY_REUSABLE ;
LOOP Statements
11-1 06 PL/SQL User’s Guide and Reference
Internally, PL/SQL assigns the values of the bounds to temporary PLS_INTEGER
variables, and, if necessary, rounds the values ... MODE;
Related Topics
COMMIT Statement, ROLLBACK Statement
RESTRICT_REFERENCES Pragma
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RESTRICT_REFERENCES Pragma
To be calla...
PL/SQL User’s Guide and Reference phần 10 ppsx
... VARCHAR2 variable, PL/SQL aborts the assignment and
raises VALUE_ERROR.
Note:
The same rules apply when fetching.
Sample 6. Calling a Stored Procedure
A- 16 PL/SQL User’s Guide and Reference
EXEC ... Values
Inserting Character Values
Selecting Character Values
Guidelines
C -6 PL/SQL User’s Guide and Reference
Calling Subprograms and Methods
Name Resolution D-11
S...
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