barcode generator in vb.net codeproject CD_STOCK CD_NAME: VARCHAR (60) CD_TYPE: CHAR (4) IN_STOCK: INT 19 28 6 8 10 11 in Software

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CD_STOCK CD_NAME: VARCHAR (60) CD_TYPE: CHAR (4) IN_STOCK: INT 19 28 6 8 10 11
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CD_OUT CD_NAME: VARCHAR (60) Court and Spark Kojiki That Christmas Feeling Patsy Cline: 12 Greatest Hits Leonard Cohen The Best of Orlando CD_TYPE: CHAR (4) FROK NEWA XMAS CTRY FROK STRK
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Famous Blue Raincoat FROK Blue Past Light Out of Africa Fundamental Blues on the Bayou CPOP NEWA STRK NPOP BLUS
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Figure 14-4
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Creating a delete trigger on the CD_STOCK table
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The FOR EACH clause follows the REFERENCING clause. The FOR EACH clause uses the ROW option. As a result, a row will be inserted into the CD_OUT table for each row deleted from the CD_STOCK table. Next is the triggered SQL statement. Notice that in this example, a BEGIN...END statement is not used. Because there is only one triggered statement, you do not have to use the BEGIN...END block (except Oracle always requires a block). The triggered statement in this case is an INSERT statement that specifies two values, each of which is based on the values deleted from the CD_STOCK table. The Old alias is used to qualify each column name. As a result, the deleted values can be inserted directly into the CD_OUT table. Now let s take a look at an example of what happens when you delete a row from the CD_STOCK table. The following DELETE statement deletes the Past Light row from the table:
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DELETE CD_STOCK WHERE CD_NAME = 'Past Light';
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Once you execute this statement, the row is deleted and the trigger is invoked. The row is then inserted into the CD_OUT table. You can verify the deletion by using the following SELECT statement to view the contents of the CD_STOCK table:
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SELECT * FROM CD_STOCK;
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The query results from this statement should no longer include the Past Light row. However, if you execute the following SELECT statement, you ll see that a row has been inserted into the CD_OUT table:
SELECT * FROM CD_OUT;
Each time a row is deleted from the CD_STOCK table, two values from that row will be inserted into the CD_OUT table. As with other trigger definitions, you could have included a WHEN clause in your CREATE TRIGGER statement so that the triggered SQL statements are executed only when the search condition specified in the WHEN clause evaluates to true. Otherwise, the statements are not executed. The row will still be deleted from the CD_STOCK table, but nothing will be inserted into the CD_OUT table.
Try This 14-1
Creating SQL Triggers
Throughout this chapter, we have looked at how to create the three basic types of triggers insert, update, and delete triggers. You will now create your own triggers (one of each of the three types) in the INVENTORY database. The triggers will be defined to log data modification activity that occurs in the ARTISTS table. Whenever data is modified in the ARTISTS table, a row will be inserted into a log table, which you will create. The log table will record the type of action taken (insert, update, delete), the ARTIST_ID value for the modified row, and a timestamp of when the row was inserted into the table. As a result, whenever you execute an INSERT, UPDATE, or DELETE statement against the ARTISTS table, a row will be inserted into the new table for each row that is modified. As with other Try This exercises in this book (particularly 13, when you created stored procedures),
14:
Creating SQL Triggers
you should refer to the documentation for your SQL implementation when creating triggers to make certain you follow that product s standards. There are a lot of variations among the SQL implementations. You can download the Try_This_14.txt file, which contains the SQL statements used in this exercise.
Step by Step
1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. Before you create the actual triggers on the ARTISTS table, you must create a table that will
log the data modifications you make to the ARTISTS table. The log table, named ARTIST_ LOG, will include three columns to record data modification events. One of the columns will be configured with a default value that records the current date and time. Enter and execute the following SQL statement:
CREATE TABLE ARTIST_LOG ( ACTION_TYPE CHAR(6), ARTIST_ID INT, MOD_DATE TIMESTAMP DEFAULT CURRENT_TIMESTAMP );
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