barcode generator in vb.net codeproject Creating SQL-Invoked Functions in Software

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Creating SQL-Invoked Functions
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In this Try This exercise, you will create a function named CD_LABEL in the INVENTORY database. The function will provide the name of the company that publishes a specified CD. Once you create the function, you will invoke it by using it as a value in a SELECT statement. When you are finished, you will drop that function from your database. You can download the Try_This_13_2.txt file, which contains the SQL statements used in this exercise.
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1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. You will create a function that returns the name of the company that publishes a specified
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CD. The function will include an input parameter that allows you to pass the name of the CD into the function. Enter and execute the following SQL statement:
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CREATE FUNCTION CD_LABEL ( p_CD VARCHAR(60) ) RETURNS VARCHAR(60) BEGIN RETURN ( SELECT COMPANY_NAME FROM COMPACT_DISCS d, CD_LABELS l WHERE d.LABEL_ID = l.LABEL_ID AND CD_TITLE = p_CD ); END;
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You should receive a message indicating that the CD_LABEL function has been created.
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3. Now that the function has been created, you can use it in your SQL statements as a value
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in an expression. The next statement that you ll create is a SELECT statement that returns the name of the CD and the company that publishes the CD for those CDs published by the same company as the specified CD. Enter and execute the following SQL statement:
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SELECT FROM WHERE AND CD_TITLE, COMPANY_NAME COMPACT_DISCS d, CD_LABELS l d.LABEL_ID = l.LABEL_ID COMPANY_NAME = CD_LABEL ('Blues on the Bayou');
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Your query results should include a list of four CDs, all of which were published by MCA Records, the company that publishes Blues on the Bayou.
4. Try executing the same statement by using various names of CDs to see what results are
returned.
13:
Creating SQL-Invoked Routines
5. Now you can drop the CD_LABEL function from your database. Enter and execute the
following SQL statement:
DROP FUNCTION CD_LABEL CASCADE;
You should receive a message indicating that the CD_LABEL function has been dropped from the database.
6. Close the client application.
Try This Summary
The Try This exercise had you create a function (CD_LABEL) that includes one parameter (p_CD). The parameter passes the value of a CD name to the SELECT statement defined in the RETURN statement of the parameter. The statement uses this information to determine the name of the company that publishes the CD. You then used the CD_LABEL function in a SELECT statement to retrieve the names of all CDs that are published by the same company that published the specified CD. After that, you dropped the function from the database. Now that you ve completed this exercise, try creating other functions in the database, and then use the functions in SELECT statements to see what sort of data you can return.
13 Self Test
1. Which are types of SQL-invoked routines supported by the SQL standard A CHECK Constraint B Function C Trigger D SQL-invoked procedure 2. Which types of parameters can you use in an SQL-invoked function A Input B Output C Input/output D Variable 3. Which statement do you use to invoke an SQL-invoked procedure A RETURN B CALL
SQL: A Beginner s Guide
C SET D DECLARE 4. A(n) ____________ is a value passed to a statement in a procedure when you invoke that
procedure.
5. Which types of parameters can you use in an SQL-invoked function A Input B Output C Input/output D Variable 6. What is another name for an SQL-invoked procedure 7. What are the two primary differences between procedures and functions 8. What information must you include in a CALL statement when invoking a procedure 9. Which types of statements can you include in a procedure A SELECT B INSERT C UPDATE D DELETE 10. Which statement do you use to assign an initial value to a variable A DECLARE B RETURN C SET D CALL 11. A(n) ____________ statement allows you to group SQL statements into blocks. 12. Which keyword do you use to begin a conditional statement A IF B BEGIN C THEN D ELSE 13. What keyword do you use in a LOOP statement to end that loop
13:
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