PL/SQL User’s Guide and Reference phần 7 ppt
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
keywo...
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 8 pptx
... operator returns the Boolean value TRUE if its operand is null, or
FALSE if its operand is not null.
GOTO Statement
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From the current block, a GOTO statement ... error_number ) ;
exception_init_pragma
Exceptions
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Example
The following PL/SQL block has two exception handlers:
DECLARE
bad_emp_id...
PL/SQL User’s Guide and Reference phần 1 pdf
... not
grant them access to the table itself.
Advantages of PL/SQL
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Main Features
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Iterative Control
LOOP statements let you ... this
guide. For that kind of information, see the Oracle installation or user’s guide for
your system.
How This Guide Is Organized
The PL/SQL User’s Guide an...
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
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In such cases, to avoid ambiguity, prefix the names of local variables a...
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 ... America Since 1825’, 4),
Course( 370 2, ’Medieval Islamic History’, 4)));
Manipulating Records
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Using Collection Methods
Collections a...
PL/SQL User’s Guide and Reference phần 5 ppsx
... EXCEPTION_INIT(deadlock_detected, -60);
Understanding Parameter Aliasing
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Understanding Parameter Aliasing
To optimize a subprogram call, the PL/SQL compiler can choose between ... my_dname, my_loc);
END;
Understanding Functions
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Understanding Functions
A function is a subprogram that computes...
PL/SQL User’s Guide and Reference phần 6 docx
... 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?
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Next, ... Types
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Object Type
Rational
A rational number is a number expressible as the quotient of two integers, a
numerator and a d...
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... SERIALLY_REUSABLE ;
LOOP Statements
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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 callabl...
PL/SQL User’s Guide and Reference phần 10 ppsx
...
KING 78 39 5000
SCOTT 77 88 3000
FORD 79 02 3000
JONES 75 66 2 975
BLAKE 76 98 2850
CLARK 77 82 2450
ALLEN 74 99 1600
TURNER 78 44 1500
MILLER 79 34 1300
WARD 75 21 1250
MARTIN 76 54 1250
ADAMS 78 76 1100
JAMES ... CHAR.
Dealing with Size Limits
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Dealing with Size Limits
PL/SQL is based on the programming language Ada. As a result...