![]() We are always trying to help the developer community, So we made their work easy. We recommend you apply the first solution to your code because it was tested in our system before posting it on this page. Note: You are free to use these solutions for your personal use. (Fun fact: INTEGER PRIMARY KEY implicitly adds AUTOINCREMENT NOT NULL as well as the default incremental value to our _id column.) In this table, you do not need to create a timestamp trigger for an INSERT statement, since it is done already. Last_modified TIMESTAMP NOT NULL DEFAULT current_timstamp) In other words, you cannot use: CREATE TRIGGER trigger_nameįrom your last comment you may have figured out the best way to handle an INSERT statement for our purpose: CREATE TABLE foo ( " SET " + TIME + " = current_timestamp" +Īccording to the SQLite website you need to create a trigger for each type of action. " AFTER UPDATE ON " + TABLE_NAME + " FOR EACH ROW" + My trigger (in java form): private static final String UPDATE_TIME_TRIGGER = Lastly, using a trigger like this is the easiest way I know to maintain last_modified or last_accessed timestamp. The trigger in your link is executable (I used it myself), just change the table / column names.The database won’t assume because another table has a last_modified column that you want this one to behave the same… You need to execute a CREATE TRIGGER for every table / column combination you want affected.After, so the trigger has a valid table to reference.If you still getting this error after applying this code then comment below we will get back to you with the new method. You just have to apply the suggested solution to your code and it will do for you. This is a common error many developers questioned us about it. Or if Triggers are a bad idea, are there any better alternatives? Since I’m quite new to database operations, could you provide an example Android Trigger statement that performs the above behavior, or provide a resource to an example?.and notify to set that row’s “ last_modified” field, or do I have to create a separate Trigger for each table? Can I use the same Trigger for every table in my database? i.e, can the Trigger automatically detect which table and row is being updated/inserted/replaced/etc.Where should I put the db.execSQL("CREATE TRIGGER.") statement? Before or after I create the tables?.I’ve read this link: on update current_timestamp with SQLite It basically says that I’m using the right approach. I have a couple questions relating to Triggers, SQLite, and Android. I’m new to database operations, but I’ve seen that a Trigger might be the best way to do this. To do this, I’m adding a column “ last_modified” to each row that indicates the time when that row was added/updated/replaced/etc. I only want to update modified rows in my database. I’m writing an Android app that uses a local SQLite database (with multiple tables) that syncs with a MySQL database every now-and-then. ![]() This might be more of a design question, but here goes. All we need is a simple explanation of the problem, which is provided below.
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