database-trigger

问题 I want to call rest api in a POST method from a stored procedure or trigger in mysql server on windows. How do I perform this solely with MySQL? 回答1: You can use a mysql-udf-http and then create a trigger like this: delimiter $$ CREATE TRIGGER upd_check BEFORE UPDATE ON account FOR EACH ROW BEGIN IF NEW.amount > 0 THEN set @json = select json_object(account_id,amount) select http_post('http://restservice.example.com/account/post',@json); END IF; END;$$ delimiter; 回答2: Basically you can't. And

问题 I want to call rest api in a POST method from a stored procedure or trigger in mysql server on windows. How do I perform this solely with MySQL? 回答1: You can use a mysql-udf-http and then create a trigger like this: delimiter $$ CREATE TRIGGER upd_check BEFORE UPDATE ON account FOR EACH ROW BEGIN IF NEW.amount > 0 THEN set @json = select json_object(account_id,amount) select http_post('http://restservice.example.com/account/post',@json); END IF; END;$$ delimiter; 回答2: Basically you can't. And

问题 I want to call rest api in a POST method from a stored procedure or trigger in mysql server on windows. How do I perform this solely with MySQL? 回答1: You can use a mysql-udf-http and then create a trigger like this: delimiter $$ CREATE TRIGGER upd_check BEFORE UPDATE ON account FOR EACH ROW BEGIN IF NEW.amount > 0 THEN set @json = select json_object(account_id,amount) select http_post('http://restservice.example.com/account/post',@json); END IF; END;$$ delimiter; 回答2: Basically you can't. And

问题 I want to create a trigger which counts rows and updates a field in an other table. My current solution works for INSERT statements but failes when I DELETE a row. My current function: CREATE OR REPLACE FUNCTION update_table_count() RETURNS trigger AS $$ DECLARE updatecount INT; BEGIN Select count(*) into updatecount From source_table Where id = new.id; Update dest_table set count=updatecount Where id = new.id; RETURN NEW; END; $$ LANGUAGE 'plpgsql'; The trigger is a pretty basic one, looking

问题 I want to create a trigger which counts rows and updates a field in an other table. My current solution works for INSERT statements but failes when I DELETE a row. My current function: CREATE OR REPLACE FUNCTION update_table_count() RETURNS trigger AS $$ DECLARE updatecount INT; BEGIN Select count(*) into updatecount From source_table Where id = new.id; Update dest_table set count=updatecount Where id = new.id; RETURN NEW; END; $$ LANGUAGE 'plpgsql'; The trigger is a pretty basic one, looking

问题 I have create a trigger which is create a dynamic query.and execute it i had tried 'EXECU q' but it does not work. how can i run/execute that dynamic query. BEGIN DECLARE a INT Default 0 ; DECLARE str VARCHAR(255); DECLARE q VARCHAR(500); SET q = 'insert into '+new.master_name+' values('; simple_loop: LOOP SET a=a+1; SET str = SPLIT_STRING(new.remarks,"|",a); SET q = CONCAT(q,str+','); SET q = LEFT(q, LENGTH(q) - 1); IF str='' THEN LEAVE simple_loop; END IF; END LOOP simple_loop; SET q =

问题 I have a database FOO with several columns, among those I have one column "Url". I need to write a trigger before insert/update that will check the Url columns whether the newer value matches any existing values, i.e. "hello" except some predefined value. That means if "hello" is inserted or updated multiple times no error will happen otherwise it will check for duplicity. And if it finds some aborts the insertion update. This will also return some code so that my script calling for the

问题 I had made two tables with the following fields: TABLE 1: "demo" FIELD: "demoid" FIELD: "cpid" FIELD: "status" TABLE 2: "sample" FIELD: "id" FIELD: "conid" FIELD: "statussample" FIELD: "date" I want to update the status whenever the sample table field statussample gets changed. The condition would be 1) `demoid` and `id` would be same and `cpid` and `conid` would be same.(if more than one values comes i want the last inserted value of `sample` using the field `date`) How to do that?I had

问题 I'm trying to develop a notification system for the backend of a social media application/website. For now I'm focusing on status updates. What I'm going to do, is putting a trigger on the postgres table that related to status updates so that every time a new status update is posted, a notification is sent to my code. So far I have been able to do that. But an extra feature that I like to implement is extracting all of the people who follow the user who posted the status update, so that I can

问题 This is an simplification of actual scenario; where is see missing records on Table B. Say there are two db tables A ; B. There is an on insert trigger on Table A;which do an insert to Table B (but it doesn't have COMMIT;). If we open a db connection through JDBC connector; and do an insert on Table A; and commit it; What is the behavior of Trigger? Will it be automatically committed the insert statement on table B ? 回答1: Not only do triggers not need a COMMIT you can't put one in: a trigger