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sams - teach yourself oracle 8 in 21 days
... slower components. Because faster components are typically the most expensive, you must perform a balancing act between speed and cost efficiency. CPU and Cache Teach Yourself Oracle 8 In 21 Days ... for certain functions, including data integrity, recovery from failure, error handling, and so on. This is accomplished via events such as checkpointing, logging, and archiving. The following ... utilities and networking components to connect you to the correct instance. A SID is up to four alphanumeric characters in length and is required in order to connect to an Oracle instance. The SID is...
Ngày tải lên: 07/04/2014, 15:58
sams teach yourself java 6 in 21 days 5th edition
... of a Class of Objects 18 Creating a Class 19 Running the Program 21 Organizing Classes and Class Behavior 24 Inheritance 24 Creating a Class Hierarchy 26 Inheritance in Action 28 Single ... about interfaces and packages, which are useful for grouping classes and organizing a class hierarchy. 2 Sams Teach Yourself Java 6 in 21 Days www.it-ebooks.info Overriding Methods 136 Creating ... 532 Certification Practice 532 Exercises 533 xvi Sams Teach Yourself Java 6 in 21 Days www.it-ebooks.info Each class farther down the hierarchy becomes more tailored to a specific purpose. A class...
Ngày tải lên: 24/04/2014, 16:04
Teach Yourself PL/SQL in 21 Days- P16
... CHANGE, 520 CLOSE_CURSOR, 456 COLUMN_VALUE, 463 creating, 190, 192 debugging information, 193 declarative part, 190 defining, 52-53 listing, 53 dependencies, discovering, 192 exception-handling ... 158 TRUNC, 158 numbers absolute values, returning, 158 arc cosines, returning, 158 arc sines, returning, 158 arc tangents, returning, 158 converting to strings, 174-175 converting strings to, ... 190 dropping, 197 invoking, 194, 199 listing information, 195 recompiling, 193-194 storing objects as columns, 345-347 retrieving/updating, 347-349 object tables, 349, 351-356 creating, 350 inserting...
Ngày tải lên: 20/10/2013, 17:15
Teach Yourself PL/SQL in 21 Days- P1
... 2 Sams Teach Yourself PL/SQL in 21 Days, Second Edition Many of the chapters build on each other. As the book progresses from chapter to chap- ter, topics are covered in more detail and complexity, ... network traffic. Why are these problems? The procedural logic on client machines can quickly become out of sync if the software is upgraded. It can also be implemented incorrectly, resulting in a loss ... Expressions 86 Converting Datatypes 92 Implicit Conversion 92 Explicit Conversion 94 vi Sams Teach Yourself PL/SQL in 21 Days, Second Edition 00 7982 fm 11/30/99 1:24 PM Page vi Please purchase PDF Split-Merge...
Ngày tải lên: 07/11/2013, 20:15
Teach Yourself PL/SQL in 21 Days- P2
... can be a power- ful construct. If you code a comparison only once, you can go back and change the calculation later without having to find and change several occurrences in your program. It can ... however, can access the value of a_name. 30: name_print; 31: END; 32: / Jeff Gennick Inside nested block Jeff Gennick Jenny Gennick Jeff Gennick Back in the main block Jeff Gennick The code shown in ... ends on line 21. Lines 6 through 9 define the name_print procedure. The variable a_name is declared in the outermost block (see line 4), thus any nested block, procedure, or function has access...
Ngày tải lên: 07/11/2013, 20:15
Teach Yourself PL/SQL in 21 Days- P3
... reduce the total lines of coding and take a modular approach to writing code. You can retype in each PL/SQL block the same repetitive lines of code, or you can write a function. Then, you can call ... When I am comparing strings, especially when comparing a CHAR string to a VARCHAR2 string, is there a convenient way to tell PL/SQL to ignore any trail- ing spaces in the CHAR string? A Yes. ... 995.99 PL/SQL procedure successfully completed. The code in Listing 3.10 illustrates some common implicit conversions. The first assignment, in line 11, causes no conversion at all because a string is...
Ngày tải lên: 07/11/2013, 20:15
Tài liệu Teach Yourself PL/SQL in 21 Days- P4 pptx
... try using recursion to calculate the factorial of an integer. First, you need to create the function FACTORIAL by executing the code in Listing 5.24. L ISTING 5.24 Creating the FACTORIAL Recursive ... and the decimal point. ã NLS_CURRENCY Specifies the local currency. ã NLS_ISO_CURRENCY Characters to represent the ISO currency symbol. You can make some decent format attempts for numbers in a column. ... v_Calc NUMBER := 0; 3: BEGIN 4: WHILE v_Calc >= 10 LOOP 5: v_Calc := v_Calc + 1; 6: DBMS_OUTPUT.PUT_LINE(‘The value of v_Calc is ‘ || v_Calc); 7: END LOOP; 8: END; 9: / In Listing 5.7, the condition...
Ngày tải lên: 15/12/2013, 05:15
Tài liệu Teach Yourself PL/SQL in 21 Days- P5 doc
... PUT_LINE command line that you can include inside a procedure. L ISTING 7.2 The PUT_LINE Command Within a Procedure CREATE OR REPLACE PROCEDURE emp_change_s (i_emp_id IN integer) AS BEGIN UPDATE ... the specification declares a function and two procedures. Then the package body contains the actual logic for the items declared in the specification: CREATE PACKAGE employee_maint AS Procedure ... place too many items in the package specification; specifically, avoid placing in the package specification items that need to be compiled. Changes to a package body do not require Oracle to recompile...
Ngày tải lên: 15/12/2013, 05:15
Tài liệu Teach Yourself PL/SQL in 21 Days- P6 docx
... assignment FETCH stock_cv_1 INTO stock_rec; fetch first record from cursor FETCH stock_cv_2 INTO stock_rec; fetch second record from cursor FETCH stock_cv_2 INTO stock_rec; fetch third record from cursor CLOSE ... (stock_cv_1 in out stock_cur_type, stock_cv_2 in out stock_cur_type); stock_rec stocks%rowtype; BEGIN OPEN stock_cv_1 FOR SELECT * FROM stocks; open the cursor stock_cv_2 := stock_cv_1; cursor ... stock_purchase; The package body is CREATE PACKAGE BODY stock_purchase as CURSOR stock_cur return stock%rowtype SELECT stock_type, stock_name, curr_prics FROM stocks WHERE stock_type = :stock_type; Note...
Ngày tải lên: 15/12/2013, 05:15
Tài liệu Teach Yourself PL/SQL in 21 Days- P7 ppt
... imagina- tion. Some common uses are ã Enforcing business rules ã Maintaining referential integrity ã Enforcing security ã Maintaining a historical log of changes ã Generating column values, including ... from having to program and test this logic several places in your application. Maintaining History This last example concerning triggers will involve using them to maintain a historical record of changes ... to create array elements, or you can invoke the constructor with no parameters in order to create an empty array. The code in Listing 10.6 shows a varray being declared, and the constructor being...
Ngày tải lên: 15/12/2013, 05:15