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Teach Yourself PL/SQL in 21 Days- P16

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... (SylvainFaust Inc.), 11SQL-Station (PlatinumTechnology Inc.), 11SQLCODE function, 160, 211 -212 SQLERRM function, 160, 211 -212 SQLJ, calling PL/SQL fromJava, 578-579calling procedures andfunctions, ... 158TRUNC, 158numbersabsolute values, returning,158arc cosines, returning, 158arc sines, returning, 158arc tangents, returning,158converting to strings,174-175converting strings to, ... 190dropping, 197invoking, 194, 199listing information, 195recompiling, 193-194storing objectsas columns, 345-347retrieving/updating,347-349object tables, 349,351-356creating, 350inserting...

Teach Yourself PL/SQL in 21 Days- P1

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... 2 Sams Teach Yourself PL/SQL in 21 Days, Second EditionMany 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 becomeout of sync if the software is upgraded. It can also be implemented incorrectly, resulting in a loss ... place when you are executingcode 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...

Teach Yourself PL/SQL in 21 Days- P2

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... can be a power-ful construct. If you code a comparison only once, you can go back andchange the calculation later without having to find and change severaloccurrences in your program. It can ... however, can access the value of a_name.30: name_print;31: END;32: /Jeff GennickInside nested blockJeff GennickJenny GennickJeff GennickBack in the main blockJeff GennickThe code shown in ... ends on line 21. Lines 6 through 9 definethename_printprocedure.The variable a_nameis declared in the outermost block (see line 4), thus any nestedblock, procedure, or function has access...

Teach Yourself PL/SQL in 21 Days- P3

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... reducethe 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 CHARstring to aVARCHAR2string, is there a convenient way to tell PL/SQL to ignore any trail-ing spaces in the CHARstring?A Yes. ... 995.99PL/SQL procedure successfully completed. The code in Listing 3.10 illustrates some common implicit conversions. The firstassignment, in line 11, causes no conversion at all because a string is...

Tài liệu Teach Yourself PL/SQL in 21 Days- P4 pptx

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... try using recursion to calculate the factorial of an integer. First, you need to createthe function FACTORIALby executing the code in Listing 5.24.LISTING5.24Creating 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: BEGIN4: WHILE v_Calc >= 10 LOOP5: 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...

Tài liệu Teach Yourself PL/SQL in 21 Days- P5 doc

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... PUT_LINEcommand line that you can includeinside a procedure.LISTING7.2ThePUT_LINECommand Within a ProcedureCREATE OR REPLACE PROCEDURE emp_change_s (i_emp_id IN integer)AS BEGINUPDATE ... the specificationdeclares a function and two procedures. Then the package body contains the actual logicfor the items declared in the specification:CREATE PACKAGE employee_maintASProcedure ... place too many items in thepackage specification; specifically, avoidplacing in the package specification itemsthat need to be compiled. Changes to apackage body do not require Oracle torecompile...

Tài liệu Teach Yourself PL/SQL in 21 Days- P6 docx

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... assignmentFETCH stock_cv_1 INTO stock_rec; fetch first record from cursorFETCH stock_cv_2 INTO stock_rec; fetch second record from cursorFETCH stock_cv_2 INTO stock_rec; fetch third record from cursorCLOSE ... (stock_cv_1 in out stock_cur_type,stock_cv_2 in out stock_cur_type);stock_rec stocks%rowtype;BEGINOPEN stock_cv_1 FOR SELECT * FROM stocks; open the cursorstock_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,...

Tài liệu Teach Yourself PL/SQL in 21 Days- P7 ppt

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... imagina-tion. Some common uses are• Enforcing business rules• Maintaining referential integrity• Enforcing security• Maintaining a historical log of changes• Generating column values, including ... fromhaving to program and test this logic several places in your application. Maintaining HistoryThis last example concerning triggers will involve using them to maintain a historicalrecord 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...

Tài liệu Teach Yourself PL/SQL in 21 Days- P8 pptx

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... 12LISTING12.8continuedANALYSISWhen inserting objects into an object table, it is not absolutely necessary tocall the object constructor for that table, so in the preceding example thereference 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 usinga SQL INSERTstatement. Instead of a list containing separate values for each attribute,you can use the buildingobject’s constructor to create an object. This one objectbecomes...

Tài liệu Teach Yourself PL/SQL in 21 Days- P9 doc

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... 1 Teach Yourself Oracle8 in 21 Days 2 Oracle Data Warehousing Unleashed3 Teach Yourself Database Development With Oracle in 21 Days 4 Oracle Unleashed 2E5 Teach Yourself Oracle8 in 21 DaysTeach ... Yourself Oracle8i in 21 Days 2 Oracle Data Warehousing Unleashed3 Teach Yourself Database Development With Oracle in 21 Days 4 Oracle Unleashed 2E5 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...

Tài liệu Teach Yourself PL/SQL in 21 Days- P10 docx

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... NUMBER BIND_VARIABLE procedureis 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 theCLOSE_CURSORprocedure to free up resources.The Syntax for the CLOSE_CURSORProcedurePROCEDURE CLOSE_CURSOR (c IN OUT INTEGER); In this syntax, c is the cursor ... NUMBER,actual_length OUT INTEGER);The headers for CHARvalues arePROCEDURE COLUMN_VALUE (c IN INTEGER,position IN INTEGER,value OUT CHAR);andPROCEDURE COLUMN_VALUE (c IN INTEGER,position IN INTEGER,value...

Tài liệu Teach Yourself PL/SQL in 21 Days- P11 docx

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... 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_executevariable, declared in lines 2–7, contains thePL/SQL block to be executed. The EXECUTE IMMEDIATEstatement in lines 12–13 is usedto 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. Youcould also fetch the data into a list of variables. The DBMS_OUTPUTcall in line 36–37allow...

Tài liệu Teach Yourself PL/SQL in 21 Days- P12 doc

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... using a special form of the CREATE FUNCTIONandCREATE PROCEDUREcommands to write what Oracle refers to as a call spec. Acall spec looks like a PL/SQL function or procedure header, and specifies ... Alerting and Communicating with Other Procedures 54719The Syntax for the PACK_MESSAGEProcedureThe format for PACK_MESSAGEisPROCEDURE PACK_MESSAGE(data IN VARCHAR2);PROCEDURE PACK_MESSAGE(data ... DBMS_PIPEpackage handles all jobs by using backgroundprocesses 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...

Tài liệu Teach Yourself PL/SQL in 21 Days- P13 ppt

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... 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_AQpackage, and contains entry points allowing you to send andreceive 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 REVERSEkeyword,...

Tài liệu Teach Yourself Perl 5 in 21 days doc

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... 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 ... line3: # back out4: $inputline = <STDIN>; # read a line of input5: print( $inputline ); # write the line out$ programIN_1This is a line of input.This is a line of input.$ Teach Yourself...