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

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Creating SQL-Invoked Routines
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assigned the value New Age, and the p_Amount parameter is assigned the value 5, making the SELECT statement embedded in the procedure definition behave as though you entered the values directly, as shown in the following example:
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SELECT FROM WHERE AND AND CD_TITLE, CD_STOCK CD_INVENTORY i, CD_TYPES t i.CD_TYPE_ID = t.CD_TYPE_ID CD_TYPE_NAME = 'New Age' CD_STOCK > 5;
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If you were to execute this statement, you would return the same query results as you would if you were to execute the CALL statement using the New Age value and 5 value, as shown in the following results:
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CD_TITLE ---------Past Light Kojiki CD_STOCK -------6 10
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Now let s modify the CALL statement to see how specifying a different value might affect the results. Suppose you use a numeric value of 8, rather than 5, as shown in the following statement:
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CALL CDS_BY_TYPE ('New Age', 8);
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If you were to execute this statement, only one row would be returned:
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CD_TITLE ---------Kojiki CD_STOCK -------10
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If you refer back to the CD_INVENTORY table in Figure 13-1, you ll see that only the Kojiki row is a New Age CD with a CD_STOCK value that exceeds 8, the value you specified in your CALL statement. As you can see, using multiple parameters can provide you with a variety of options that make procedures a useful and flexible tool that can eliminate the need to write multiple statements that are meant to provide similar results. If you define the necessary parameters, users simply plug in the necessary values to achieve the results they desire.
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Using Procedures to Modify Data
Up to this point, the SQL-invoked procedures that we ve looked at have contained SELECT statements that query data. However, procedures are not limited to only SELECT statements. You can include data modification statements such as INSERT, UPDATE, and DELETE. Let s return to the CD_INVENTORY table and CD_TYPES table, shown in Figure 13-1. You might have noticed that the CD_INVENTORY table includes a row for the Fundamental CD. The music type for that CD is New Pop, which is represented by NPOP (the value in the CD_ TYPE_ID column). You might also have noticed that there is no corresponding entry in the CD_TYPES table for the New Pop type. You can create a procedure that allows you to insert
SQL: A Beginner s Guide
values into that table. You simply need to define that procedure with the appropriate input parameters and INSERT statement, as shown in the following example:
CREATE PROCEDURE INSERT_TYPE ( IN p_Type CHAR(4), IN p_Name CHAR(20) ) INSERT INTO CD_TYPES VALUES ( p_Type, p_Name );
Notice that the procedure definition includes two input parameters: p_Type and p_Name, both of which are defined with the CHAR data type. These parameters are then used in the INSERT statement, in the same way in which you would normally specify values to be inserted into a table. Any parameter that you declare for this purpose must be defined with a data type that is compatible with the data type defined on the column that contains the data to be modified. Once you create the procedure, you can use a CALL statement similar to the following example to invoke the procedure:
CALL INSERT_TYPE('NPOP', 'New Pop');
Notice that the CALL statement includes NPOP and New Pop values. These values are passed to the two parameters defined in the INSERT_TYPE procedure. As a result, they are inserted into the CD_TYPES table as though you had executed the INSERT statement directly. In the same way that you create the INSERT_TYPE procedure, you can create procedures that update and delete data by including the appropriate UPDATE and DELETE statement, rather than an INSERT statement. Simply create the necessary input parameters and assign the appropriate values to those parameters when you call the procedure. However, keep in mind that the value you pass using the parameters must conform not only to the data types defined in the parameter declarations, but also to the data types and constraints on the columns that contain the data you re trying to modify.
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