Sqlite update java9/25/2023 String Str_curtrainee = cursor.getString(0) Int comp_count = 0, notcomp_count = 0, act_count = 0, pending_count = 0 + TRAINING_PLAN_STATUS + " =4 and " + TRAINING_PLAN_ISACTIVE + " =1 group by "Ĭur_pending = db.rawQuery(countQuery, whereArgs) + TRAINING_PLAN_STATUS + " !=2 and " + TRAINING_PLAN_ISACTIVE + " =1 group by "Ĭur_notcompleted = db.rawQuery(countQuery, whereArgs) countQuery = "SELECT * FROM " + TABLE_TRAINING_PLAN + " WHERE " + TRAINING_PLAN_SITEID + " = '" + SiteId + "'" Ĭur_completed = db.rawQuery(countQuery, whereArgs) ![]() + TRAINING_PLAN_STATUS + " =2 and " + TRAINING_PLAN_ISACTIVE + " =1 group by " + GRP_EMPLOYEE_USERID + " FROM " + TABLE_GRP_EMPLOYEE + " WHERE " + GRP_EMPLOYEE_SITEID + " =? and " + TRAINING_PLAN_TRAINEEID + " IN (SELECT " Public void UpdateCountsinTraineeTable(long SiteId), whereClause,Ĭursor cursor = db.rawQuery(empQuery, whereArgs) ĬountQuery = "SELECT " + TRAINING_PLAN_TRAINEEID + ", count(*) from " + TABLE_TRAINING_PLAN + " WHERE " Taking that into account, the behaviour of "changes" makes perfect sense (though the feature admittedly has an unfortunate name).I have a task in which i need to change java code to uwp c# code i have no idea how to change this code in which i need to update the completed count and not completed count and pending count the for each employee Then, instantiate an object the PreparedStatement class by calling the. For the UPDATE statement that uses parameters, you use the question marks (). Granted, it would, on average, normally have to compare far fewer columns, but the fact remains that, computationally speaking, that comparison could, for arbitrarily large fields in arbitrary numbers of rows, be expensive and would necessarily apply to every update because sqlite cannot predict whether the client would eventually ask for the number of modified rows. To update existing data of a table, you follow the steps below: First, connect to the SQLite database. Such an update would, in order for "changes" to know whether anything was actually modified, compare up to 25 columns (a.y) which are irrelevant for the WHERE clause (i.e. Of course it has to read the rows, but my point is that it in order to know whether a row was actually modified (as oppose to "affected"), it would have to compare N fields unrelated to the WHERE clause: update t set a=1, b=2. SQLite has to read and parse the entire row anyway otherwise it would not be able to run triggers or re-write the row (update it). If the SELECT returns any rows, the UPDATE either succeeded or was not needed, but there definitely is a Row with that id and value now. SELECT 1 FROM table WHERE id=911 AND column_name=value Which is the only good way to know if id 911 exists in the table or not.Īnother way to check AFTER the fact if an update succeeded (if needed), is to formulate this: UPDATE table SET column_name=value WHERE id=911 You really cannot get away from issuing: SELECT 1 FROM table WHERE id=911 If that returns any row, then it means your update statement WILL modify the DB. If you want to know if it WILL modify a record, or if there was definitely a record to modify, you have to issue two statements, the first might be: SELECT 1 FROM table WHERE id=911 AND column_namevalue If you simply want to know if a record was modified or not, the page posted by others is perfect. ![]() ![]() Is there any method to check the update statement is really modify a record ?ĭo you mean if it "has modified" a record, or if it "will modify" a record?
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |