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Updating a stored procedure

Posted on by Zulurr Posted in Big Ass 2 Comments ⇩

Additional information is passed as a DBErrorException to the caller. The new design allowed for an automatic passenger-loading ramp to extend to the trains, but led to the tracks being too close together for two trains to be there at the same time. Consequently, if you use Modify to change a stored procedure, be careful that you do not inadvertently introduce changes into the database. Click the Procedure button, select the stored procedure you want to have execute when the SQL update method is generated, and click OK. The DataWindow control examines the table in the DataWindow object, determines the appropriate SQL statement for each row, and submits the appropriate stored procedure as defined in the Stored Procedure Update dialog box with the appropriate column values substituted for the procedure arguments. And as we know from examples like the Seattle monorail crash see notes at the end of this article , any system that is designed with a built-in flaw will eventually fail because of that flaw. Since stored procedures provide for conditional execution, you can also use them to enforce additional business rules. Matching a column to a procedure parameter You must be careful to correctly match a column in the DataWindow object to a procedure parameter, since PowerBuilder is able to verify only that datatypes match. If a new method or method arguments are specified without a preceding definition of type, Modify fails. If a stored procedure uses parameters that are not matched to column names, you can substitute the value from a DataWindow object computed field or expression. The tracks were shortened in the to end at the newly constructed Westlake Center mall. If the parameter is to receive a column value, indicate whether the parameter will receive the updated column value entered through the DataWindow object or retain the original column value from the database. Why use stored procedures? The parameters used in the stored procedure are displayed in the Argument Name list in the order in which they are defined in the procedure. Select the tab for the SQL update method Delete, Insert, or Update with which you want to associate a stored procedure. This ensures that the stored procedure always exists, and because SQL is transactional it is possible to have one caller finishing a call to the old version of the stored procedure while the new version is added and called.

Updating a stored procedure


Restrictions on the use of Modify Since a database driver can only report stored procedure names and parameter names and position, it cannot verify that changes made to stored procedures are valid. And as we know from examples like the Seattle monorail crash see notes at the end of this article , any system that is designed with a built-in flaw will eventually fail because of that flaw. This ensures that the stored procedure always exists, and because SQL is transactional it is possible to have one caller finishing a call to the old version of the stored procedure while the new version is added and called. Game design, game programming and more A better way to update SQL stored procedures October 30, by Patrick Wyatt 9 Comments A common pattern to manage SQL stored procedures is to drop the current procedure and recreate it. The stored procedure must have been previously defined in the database. Return values from procedures cannot be handled by the DataWindow control. As you might imagine, this design eventually failed. Just kick all your users off the server, switch to single user mode, execute the code above and it will work fine. Associate a column in the DataWindow object or an expression with a procedure parameter. Calling the type qualifier ensures that internal structures are built before subsequent calls to Modify. Updating using stored procedures The Stored Procedure Update dialog box only allows you to associate an existing stored procedure with your DataWindow object. If a new method or method arguments are specified without a preceding definition of type, Modify fails. The UpdateData method returns 1 if it succeeds and -1 if an error occurs. Matching a column to a procedure parameter You must be careful to correctly match a column in the DataWindow object to a procedure parameter, since PowerBuilder is able to verify only that datatypes match. Column Name lists the columns used in your DataWindow object. Consequently, if you use Modify to change a stored procedure, be careful that you do not inadvertently introduce changes into the database. If you do not select Use Original, the parameter will use the new value entered for that column. What happens when the stored procedure is executed The stored procedure you associate with a SQL update method in the Stored Procedure Update dialog box is executed when the DataWindow control calls the UpdateData method. For information, see the DataWindow object property Table. The new design allowed for an automatic passenger-loading ramp to extend to the trains, but led to the tracks being too close together for two trains to be there at the same time. You can also define procedural SQL statements in a stored procedure for use by all applications accessing a database. Click the Procedure button, select the stored procedure you want to have execute when the SQL update method is generated, and click OK. The tracks were shortened in the to end at the newly constructed Westlake Center mall. Additional information is passed as a DBErrorException to the caller. Using stored procedures to perform database updates allows you to enhance database security, integrity, and performance. In fact the standard operating procedure for our database updates was to update all stored procedures several hundred of them every time we performed a deployment. Since stored procedures provide for conditional execution, you can also use them to enforce additional business rules.

Updating a stored procedure


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