This becomes an issue when a table needs to have a created timestamp and a modified timestamp, and the developer does not want to or cannot use the development language to insert a timestamp into the database.Which field do you give the current timestamp default to? How does one ensure that these timestamps are always correctly updated?Join them; it only takes a minute: Sign up Using My SQL 5.6 with Inno DB storage engine for most of the tables. I tried inserting data to a My ISAM table row by row and it took 35 minutes.Inno DB buffer pool size is 15 GB and Innodb DB indexes are around 10 GB. I have one big table which contains around 10 millions records. I need to take only 3 values per line out of 10-12 from the file and update it in the database.The answer to these questions lies in a fundamental action of My SQL databases: The trigger.
Triggers have been supported in My SQL since version 5.0.2.
I'll stick to the M-V-VM approach where the View decides Insert and Update Objects are persisted (inserted or updated) when the user leaves a row that he was editing. This is fired just before committing the modified row.
Moving to another cell in the same row updates the corresponding property through data binding, but doesn't signal the Model (or the Data Access Layer) yet. Here's the registration of the event handler, in XAML: Important remark In its current implementation, a Data Grid Template Column will NOT trigger any of the Data Grid's events. In this sample, if you only change the Latest Victory date of a Formula 1 Driver, the method on the Formula 1 Driver will NOT be called. Delete Objects are deleted if the user selects one or multiple rows in the Data Grid and hits the Delete button.
For example, you could set up a trigger to update a field of Table B when a record is inserted into Table A.
This applies to timestamps in that a trigger can be set up to place the current timestamp in any desired field.