sams teach yourself c sharp in 21 days free download

Ngày tải lên: 07/04/2014, 15:58

Ngày tải lên: 24/04/2014, 16:04

... (Sylvain Faust Inc.), 11 SQL-Station (Platinum Technology Inc.), 11 SQLCODE function, 160, 211 -212 SQLERRM function, 160, 211 -212 SQLJ, calling PL/SQL from Java, 578-579 calling procedures and functions, ... 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

... 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 ... place when you are executing code on a client. The name of that package is TEXT_IO , and it also contains an entry point named PUT_LINE . Take the code shown in Listing 1.2, replace the calls...

Ngày tải lên: 07/11/2013, 20:15

... 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

... 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

... 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 ... decimal point. • NLS_CURRENCY —Specifies the local currency. • 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

... 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

... 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 ... SELECT … With this code, you cannot open the cursor with parameters containing any of the following: OPEN stock_listing_cur (stock_listing.name, ‘ABCDEFG’); OPEN stock)listing_cur (stock_listing_name,...

Ngày tải lên: 15/12/2013, 05:15

... imagina- tion. Some common uses are • Enforcing business rules • Maintaining referential integrity • Enforcing security • Maintaining a historical log of changes • 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

... 12 L ISTING 12.8 continued A NALYSIS When inserting objects into an object table, it is not absolutely necessary to call the object constructor for that table, so in the preceding example the reference to the building constructor could ... phone_number VARCHAR2(10), 8: MEMBER PROCEDURE ChangeAddress ( 9: st_1 IN VARCHAR2, st_2 IN VARCHAR2, cty IN VARCHAR2, 10: state IN VARCHAR2, zip IN VARCHAR2), 11: MEMBER FUNCTION getStreet (line_no IN number) ... just created by using a SQL INSERT statement. Instead of a list containing separate values for each attribute, you can use the building object’s constructor to create an object. This one object becomes...

Ngày tải lên: 15/12/2013, 05:15

... 1 Teach Yourself Oracle8 in 21 Days 2 Oracle Data Warehousing Unleashed 3 Teach Yourself Database Development With Oracle in 21 Days 4 Oracle Unleashed 2E 5 Teach Yourself Oracle8 in 21 DaysTe ach ... Yourself Oracle8i in 21 Days 2 Oracle Data Warehousing Unleashed 3 Teach Yourself Database Development With Oracle in 21 Days 4 Oracle Unleashed 2E 5 Teach Yourself Oracle8 in 21 Days 6 Oracle Data ... COMPARE( Lob1 IN CLOB CHARACTER SET Set_Desired, Lob2 IN CLOB CHARACTER SET LOB1%CHARSET,, Number_Bytes_to_Compare IN INTEGER, Origin_Lob1 IN INTEGER := 1, Origin_Lob2 IN INTEGER := 1) RETURN Compare_Result_Integer; In...

Ngày tải lên: 15/12/2013, 05:15

... NUMBER BIND_VARIABLE procedure is as follows. PROCEDURE BIND_VARIABLE (c IN INTEGER, name IN VARCHAR2, value IN datatype); PROCEDURE BIND_VARIABLE_CHAR (c IN INTEGER, name IN VARCHAR2, value IN CHAR, out_value_size ... should close the cursor by using the CLOSE_CURSOR procedure to free up resources. The Syntax for the CLOSE_CURSOR Procedure PROCEDURE CLOSE_CURSOR (c IN OUT INTEGER); In this syntax, c is the cursor ... NUMBER, actual_length OUT INTEGER); The headers for CHAR values are PROCEDURE COLUMN_VALUE (c IN INTEGER, position IN INTEGER, value OUT CHAR); and PROCEDURE COLUMN_VALUE (c IN INTEGER, position IN INTEGER, value...

Ngày tải lên: 15/12/2013, 05:15

... FOPEN(location IN VARCHAR2, filename IN VARCHAR2, openmode IN VARCHAR2) RETURN FILE_TYPE; FUNCTION FOPEN(location IN VARCHAR2, filename IN VARCHAR2, openmode IN VARCHAR2, max_linesize IN BINARY_INTEGER) RETURN ... block_to_execute variable, declared in lines 2–7, contains the PL/SQL block to be executed. The EXECUTE IMMEDIATE statement in lines 12–13 is used to execute the block. The crucial thing to note here is that the bind ... PL/SQL cursor pro- cessing. The FETCH in lines 31–32 fetches the data from the cursor into a record. You could also fetch the data into a list of variables. The DBMS_OUTPUT call in line 36–37 allow...

Ngày tải lên: 15/12/2013, 05:15

... using a special form of the CREATE FUNCTION and CREATE PROCEDURE commands to write what Oracle refers to as a call spec. A call spec looks like a PL/SQL function or procedure header, and specifies ... Alerting and Communicating with Other Procedures 547 19 The Syntax for the PACK_MESSAGE Procedure The format for PACK_MESSAGE is PROCEDURE PACK_MESSAGE(data IN VARCHAR2); PROCEDURE PACK_MESSAGE(data ... DBMS_PIPE package handles all jobs by using background processes to check for jobs, which are placed in job queues, to execute at a specific inter- val. To submit a job for processing, you must submit the job...

Ngày tải lên: 15/12/2013, 05:15

... NULL, multiple_consumers IN BOOLEAN DEFAULT FALSE, message_grouping IN BINARY_INTEGER DEFAULT none, comment IN VARCHAR2 DEFAULT NULL, auto_commit IN BOOLEAN DEFAULT TRUE, primary_instance IN BINARY_INTEGER ... operational interface is con- tained in the DBMS_AQ package, and contains entry points allowing you to send and receive messages. To use AQ as described in this chapter, you need to have Oracle8i ... Remember, a program can compile and still be incorrect due to logic errors. 8. When coding a loop in reverse, how must you code the beginning and ending values? Even though you are adding the REVERSE keyword,...

Ngày tải lên: 24/12/2013, 12:17

... and chr Functions ● The scalar Function ● The pack Function ❍ The pack Function and C Data Types ● The unpack Function ❍ Unpacking Strings ❍ Skipping Characters When Unpacking cascading. ... > Commands ❍ Displaying Line Actions Using the L Command ● Other Debugging Commands ❍ Executing Other Perl Statements ❍ The H Command: Listing Preceding Commands ❍ The ! Command: Executing ... line 3: # back out 4: $inputline = <STDIN>; # read a line of input 5: print( $inputline ); # write the line out $ programIN_1 This is a line of input. This is a line of input. $ Teach Yourself...

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