triggers

问题 I want to execute a google apps script whenever a new file is added to a specific folder. Currently I'm using a run-every-x-minutes clock trigger, but I only need to run the script whenever I add a file to a folder. Is there a way to do this? The same as this question - which is now almost 3 years old. The comment below the question states that: There's not a trigger for that, if that's what you're hoping. How are things getting into the folder, and do you have any control over that? – Jesse

问题 I want to execute a google apps script whenever a new file is added to a specific folder. Currently I'm using a run-every-x-minutes clock trigger, but I only need to run the script whenever I add a file to a folder. Is there a way to do this? The same as this question - which is now almost 3 years old. The comment below the question states that: There's not a trigger for that, if that's what you're hoping. How are things getting into the folder, and do you have any control over that? – Jesse

问题 I need help writing a MySQL trigger. Suppose you have a student database with the following tables: ENROLLMENT(SSN, CLASS_NO, GRADE) CLASS(CLASS_NO, CLASS_TITLE, NO_OF_STUDENTS). I need to write a trigger to increase the NO_OF_STUDENTS by one if a new student is added to the ENROLLMENT table for that CLASS_NO . 回答1: you can use mysql trigger to do this. Try something like CREATE TRIGGER 'database_name'.'after_insert_enrollment' AFTER INSERT ON 'ENROLLMENT' FOR EACH ROW BEGIN UPDATE class SET

问题 I want to write a pgsql function to create trigger dynamically. For example, a trigger to count insertions in each table. I've tried EXECUTE like this: CREATE FUNCTION trigen(tbl text) RETURNS void AS $$ BEGIN EXECUTE format( 'CREATE FUNCTION %s_insertCnt() RETURNS TRIGGER AS $$ BEGIN UPDATE insertions SET n = n + 1 WHERE tablename = %s; END $$ LANGUAGE plpgsql', tbl, quote_nullable(tbl)); EXECUTE format('CREATE TRIGGER %s_inCnt BEFORE INSERT ON %s FOR EACH ROW EXECUTE PROCEDURE %s_insertCnt(

问题 I'm trying to do a trigger but I get a mutating table error. The SQL code is something like this: CREATE OR REPLACE TRIGGER CHK_Apartado_D BEFORE INSERT OR UPDATE ON CONTRACTS FOR EACH ROW DECLARE errorvisualizacion EXCEPTION; local_enddate DATE; BEGIN SELECT enddate INTO local_enddate FROM CONTRACTS WHERE clientid=:new.clientid; IF local_enddate > SYSDATE OR local_enddate IS NULL THEN UPDATE CONTRACTS SET enddate = SYSDATE - 1 WHERE clientid=:new.clientid; END IF; END CHK_Apartado_B; / And

问题 I want to prompt user to choose between yes and no in the middle of a function and then continue the function accordingly. How is it possible? Here is my code: def download_popup(file_name, url, size, threshold): root = Tk() label = Label(root, text="The file {file} at {url} is {size}Bytes large which is larger than your threshold({threshold})." "\nShall I still download it?".format(file_name, url, size, threshold)) yes = ttk.Button(root, width=5, text="yse", command=lambda: return True) no =

问题 I have a script that adds the current date when column one is edited, but at the moment it doesn't work when a value is pasted in . Is it possible to make this script add the date for each row of the range that is pasted into column 1? function onEdit(e) { if (e.range.getSheet().getSheetName() == 'Add Statements Here' && e.range.getColumn() == 1) { e.range.offset(0,10).setValue(e.value.length>0 ? new Date() : ''); } } 回答1: When pasting onto the cell, the "value" property of the event object

问题 I am having an issue in Google Sheets TypeError: Cannot read property "source" from undefined. (line 7, file "Code") When Running the following Code Please Help function onEdit(event) { var timezone = "GMT-5"; var timestamp_format = "MM-dd-yyyy-hh-mm-ss"; var updateColName = "Ticket#"; var timeStampColName = "TimeComplete"; var sheet = event.source.getSheetByName('InAndOut'); var actRng = event.source.getActiveRange(); var editColumn = actRng.getColumn(); var index = actRng.getRowIndex(); var

问题 I am trying out functions and triggers int postgreSQL, however i am having a problem, when the function is triggered it is giving me an error ERROR: control reached end of trigger procedure without RETURN this particular procedure is only executing an insert into command so i do not see why it needs a return this is the script: CREATE OR REPLACE FUNCTION forest_aud_func() returns trigger as $tree_stamp$ BEGIN insert into Audit values('k',124,'l'); END; $tree_stamp$ LANGUAGE plpgsql; create

问题 I have a program, which will poll on a certain key from the redis datastore, and do something when the value satisfies a certain condition. However, I think periodically polling on redis is quite inefficient, I'm wondering if there is a "trigger" mechanism for redis, when the value changes and satisfies the condition, the trigger will be called. The trigger might be a RPC function, or an HTTP msg, or something else, so that I don't need to poll on it any more, just like the difference between