Powerbuilder Update Key Place NearAdvanced Power Builder. Get the full title to continue reading from where you left off, or restart the preview. Newsgroups: sybase.public.powerbuilder.database Date: Fri, 16:23:03 -0800 From: 'Sean A. O'Keefe' <[email protected]> X-Mailer: Mozilla 4.04 What PowerBuilder is doing at this moment is getting the first three. Monitoring the SQL that a DataWindow generates should be key in monitoring the SQL that. This is yet another place where having a common. I'm creating some events in a base object (class) in PowerBuilder. Determine a data windows primary key. Specifies whether PowerBuilder should trim trailing spaces from. Table.property Description. Whether the key column can be updated in place or the row has to be deleted and reinserted. Rows>Update Properties, Key Modification. Newsgroups: sybase.public.powerbuilder.datawindow From: 'Mike Bravo' <[email protected]> Subject: Update Key In Place Date: Mon, 13:57:11 -0700 Lines: 16 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader. PowerBuilder's Update(). Sybase is going to update that row in-place. Don't reset the row status.Modify('trans PowerBuilder 4.0 exhibits improved speed and now offers 32-bit support. Updatewhereclause modification in datawindow. Everything we place in a grid DataWindow object must. SQL SELECT statement without retrieval arguments and you want PowerBuilder to modify the update information for the. Power. Builder Online Training Courses - Advanced Power. Builder Course 2: : Session 1. Page 4. 0Data. Window Events. Till now, most of the code was written for. Command. Button's Clicked event. Similar to Command. Buttons, Data. Window Controls also have. The following are the list of Data. Window Control's important events and let's. Retrieve. Start Event. This event triggers as soon as Power. Builder. gets notification from the database saying . Display any message on the status bar, by writing the following code.// Object: Data. Window . This is the right place to write the code, if you want to do. Writing code in. this event and setting the . For example, say, the result set of a query is 1. By writing code in this event ( even a single line comment ). Power. Builder. ( of course, code for this event is executed before it is displayed on the screen ). By writing code or comment increases the total time. To reduce the time, you might want to write the code. Writing code for the . Whenever user tries to scroll down the screen, another. The number of rows that fits on a single screen is. Power. Builder, depending on the Data. Window control size at run- time. Let's. write the following code: // Object: Data. Window . Query execution complete. Please note that, Retrieve. Row event gets triggered after. Power. Builder. Update. Start Event. This event gets triggered just before Power. Builder starts. sending changes back to the database. Update. End Event. This event gets triggered as soon as the changes are. Edit. Changed Event. This event gets triggered whenever user types something in. You wouldn't want. Item. Changed Event. This event triggers whenever the data is changed and the. Use this event to validate the data and trigger . This is one of the frequently used events in the. Data. Window control. This event gives access to the old data ( which is retrieved from the. Let's write some validation code in the event. For example. let's display an error message, if the user enters an existing product. Actually, database gives an error message if duplicate product. The reason we. would like to validate here is, to display the error message as soon as the user enters a. Which means that we need to check for the existence of the product. We didn't teach embedded SQL yet, so, let's go about it using. Place a new Data. Window control in the window and name it. Go to the properties dialog box for this Data. Window control. and assign . In case you. don't remember, . If you don't get any results for the given product? We need to set the transaction object. Or &. This. Get. Item. Status( Row, 0, Primary! If the column allows NULL value, and if the content. If. that is the case, call . Get. Column. Name() returns the current column name. Just FYI, Get. Column() returns the. As you have learned in the . New!, New. Modified!, Not. Modified!. Data. Modified! Typically, user might enter the . When the row is inserted, it is in the New! That's why we check for the New! For that. reason, we need to check for the New. Modified! If you. The third argument is the buffer name. Here, we are interested in the. Primary. Buffer. Power. Builder sends the data entered by the user as. Remember, it is always in the. We need to convert into appropriate formats. The next line is bringing data. Observe the datatype conversion of the Retrieve(). Row. Count() function returns the number of rows in the specified Data. Window. If the row. Power. Builder, what it has to do after completing the script execution. Return Code Action. Default ) Accept the. Reject the data value. Reject the data value. If the return value is 0 ( Zero ), Power. Builder triggers. Return code 2 is similar to. At this point, run the application, add a new record and. You will see two error messages. We. were expecting only the Message. Box() function we placed in the Item. Changed event. Then where did the other message. If there is no code in this event by default. Power. Builder displays an error message in the default format, and rejects the data and. You can tell Power. Builder to display error messages or not. Return Code Action. Default ) Reject the. Reject the data value. Accept the data value. Reject the data value. Now, you know why Power. Builder was displaying two error. Did you find the solution for the problem from the return codes above. Now, run the application and test it. It works perfectly. Do you know what we did? We fixed one. problem and started many. We have two situations. Display an error message in the. Item. Changed event, and don't let Power. Builder display an error message in the Item. Error. event. Don't display an error message in the Item. Changed event, and let Power. Builder. display its default error message. We are displaying our message only for product. We are. NOT displaying for other fields and for failed validation rules. So, let Power. Builder. In a new record, enter. Enter 0 ( zero ) in the. Typical use of this event. Don't confuse this event with . Remember, there may. Data. Window control is one of those. A Data. Window. control looses its focus when you click on any other control in the window or press tab. Data. Window control ) in the last row ( unless you add code in the Data. Window control. to add a new row as soon as the tab is pressed in the last field. For example, say, the cursor is in the. Now, you expect the cursor to go into. At this point, if you call Get. Column. Name() function in the Item. Changed event, you get . If you call. the same function in Item. Focus. Changed event, you get . To find out the error number, you need not refer to the SQLCA object, instead, you. SQLDb. Code gives you the database specific error. SQLErr. Text contains the actual error message from the database. You can. also see the SQL statement that caused this error by referring to SQLSyntax. The. row number that caused the error can be found in the 'row' and buffer name in the 'buffer'. We will be using this event, later in this session. Error Event. This event triggers when: You have the option of ignoring/changing values of the. If you don't write script, it triggers. That means, this is the right place ( only place ) to see and modify the. SQL statement before sending it to the database. You can also skip sending the current SQL. For example, see the SQL statement sent by Power. Builder to. the database, by writing the following code in the 'SQLPreview' event in. Writing the following statement in both Data. Windows. display the SQL statements while retrieving as well as while updating the database. Message. Box(. . Do some changes in the data and save the.
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