Try it Yourself in Java Insert barcode code 128 in Java Try it Yourself

Try it Yourself use spring framework code 128c integrated toproduce ansi/aim code 128 on java USS Code 39 TRY IT YOURSELF In this chapter, you ve learned about creating procedures, with and without the use of parameters. Additionally, you ve learned about where information and source code for these procedures can be found. Part I of this section contains exercises that cover the basics of procedures.

Part 2 extends the material on native dynamic SQL from 17 and puts it to use within the context of stored procedures.. Part 1 1) Write a procedure wi th no parameters. The procedure should say whether the current day is a weekend or weekday. Additionally, it should tell you the user s name and the current time.

It also should specify how many valid and invalid procedures are in the database. 2) Write a procedure that takes in a zip code, city, and state and inserts the values into the zip code table. It should check to see if the zip code is already in the database.

If it is, an exception should be raised, and an error message should be displayed. Write an anonymous block that uses the procedure and inserts your zip code..

Part 2 1) Create a stored proc edure based on the script ch17_1c.sql, version 3.0, created in 17.

The procedure should accept two parameters to hold a table name and an ID, and should return six parameters with first name, last name, street, city, state, and zip code information. 2) Modify the procedure you just created. Instead of using six parameters to hold name and address information, the procedure should return a user-defined record that contains six fields that hold name and address information.

Note: You may want to create a package in which you define a record type. This record may be used later, such as when the procedure is invoked in a PL/SQL block..

The projects in this se jdk code 128 barcode ction are meant to have you use all the skills you have acquired throughout this chapter. The answers to these projects can be found in Appendix D and on this book s companion Web site. Visit the Web site periodically to share and discuss your answers.

. This page intentionally left blank Functions CHAPTER OBJECTIVES In this chapter, you will learn about . Creating and using functions A function that is stor spring framework code 128b ed in the database is much like a procedure in that it is a named PL/SQL block that can take parameters and be invoked. There are key differences both in how it is created and how it is used. This short chapter covers the basics of how to create, use, and drop a function.

21, Packages, shows you how to extend functions when they are placed in packages.. LAB 20.1 Creating and Using Functions LAB OBJECTIVES After completing this l j2se code-128b ab, you will be able to . Create stored functions . Make use of functions .

Invoke functions in SQL statements. . Write complex functions FUNCTION BASICS Functio applet code-128c ns are another type of stored code and are very similar to procedures. The significant difference is that a function is a PL/SQL block that returns a single value. Functions can accept one, many, or no parameters, but a function must have a return clause in the executable section of the function.

The datatype of the return value must be declared in the header of the function. A function is not a stand-alone executable in the same way a procedure is: It must be used in some context. You can think of it as a sentence fragment.

A function has output that needs to be assigned to a variable, or it can be used in a SELECT statement. FUNCTION SYNTAX The syntax for creating a function is as follows:. CREATE [OR REPLACE] FUN CTION function_name (parameter list) RETURN datatype IS BEGIN <body> RETURN (return_value); END;. The function does not n Code128 for Java ecessarily have any parameters, but it must have a RETURN value whose datatype is declared in the header, and it must return values for all the varying possible execution streams. The RETURN statement does not have to appear as the last line of the main execution section, and there may be more than one RETURN statement (there should be a RETURN statement for each exception). A function may have IN, OUT, or IN OUT parameters, but you rarely see anything except IN parameters because it is bad programming practice to do otherwise.

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