database-trigger | 易学教程

Prevent Insert Trigger

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问题 How can I get this trigger to prevent the insert where the advance is not greater than 0 or less than 100? Thanks. DROP TRIGGER CheckAdvance; CREATE OR REPLACE TRIGGER CheckAdvance BEFORE INSERT OR UPDATE OF advance ON titles FOR EACH ROW WHEN (new.advance<0 OR new.advance>100) BEGIN dbms_output.put_line('Advance is Invalid.'); END; 回答1: "it was a class question." I had a chat with a university lecturer who taught PL/SQL after I gave a presentation at a conference. My talk was on PL/SQL good

Trigger: How does the inserted table work? How to access its rows?

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问题 I have the following table Data --Table name ID -- Identity column PCode -- Postal Code I created the following trigger: CREATE TRIGGER Trig ON Data FOR INSERT AS BEGIN Select * from inserted END And inserted the following values INSERT INTO Data VALUES (125) INSERT INTO Data VALUES (126) INSERT INTO Data VALUES (127) It shows this: But I was expecting something like this: After the 1st insertion, the trigger is executed -> one row is shown in the inserted table. After the 2nd insertion, the

Timestamp for row creation and last modification

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问题 I need to keep track of the time a row was inserted into the database, and the time it was last modified. I tried to create two separate columns, and use CURRENT_TIMESTAMP : create table def ( id int, creation timestamp default CURRENT_TIMESTAMP, modification timestamp on update CURRENT_TIMESTAMP ); However, this produced an error: ERROR 1293 (HY000): Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause What is the best way

Postgres trigger notify with PHP

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问题 I have a problem or misunderstanding with Postgre trigger -> perform notify -> capture into PHP flow. My Platform is PHP(5.6) in centos with Postgres. I have to add trigger with notifications table and whenever a new notification is added to that notifications SMS has to send to that user. So here added trigger like this CREATE FUNCTION xxx_sms_trigger() RETURNS trigger LANGUAGE plpgsql AS $$ DECLARE BEGIN PERFORM pg_notify('sms', NEW.id||'' ); RETURN new; END; and in php the inserting new

how to insert nextval to trigger inside for loop

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Hi here is a code for trigger and it have a for loop. When trigger is fired ( INSERT OR UPDATE)there's another table data must include it is MICL_SUP OPEN projMgrsCursor; LOOP FETCH projMgrsCursor INTO projMgr; select micl_sup_id_seq.nextval into SUPID from dual; insert into MICL_SUP VALUES ((SUPID), (SELECT SYSDATE FROM DUAL), :NEW.ENTRYADDEDBY_EMP_NO, 3000, 0,projMgr, NULL,:NEW.EMP_NO); END LOOP; CLOSE projMgrsCursor; This is the table structure . Sup_ID primary and unique key . I cant do any changers to table structure SUP_ID -primary key ASSIGNED_DATE ASSIGNED_BY_EMP_NO AMOUNT_LIMIT IS

phpMyAdmin trigger gui checking age

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问题 I want to check whether age is greater than 18 years before inserting the record to 'employees' table. I'm using phpMyAdmin gui trigger tool. But it gives following error when I type this script in Definition section. BEGIN IF (DATEDIFF(CURRENT_DATE(),NEW.birth_date) < 6570) THEN RAISEERROR('Age is less than 18 years!',16,1) ROLLBACK END IF END Please help me to resolve this. 回答1: RAISEERROR and ROLLBACK are used in TSQL (Microsoft SQL Server) syntax. In the case of MySQL, we use SIGNAL ..

Inserted, Deleted Tables (Magic Tables) in MySQL

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问题 I am regular user of MS-SQL but now working on a project which has mysql as a back-end. Please tell me that is there exists such a inserted/Deleted tables (Magic tables) in mysql which I can use inside trigger or in normal queries. 回答1: They are called NEW and OLD in MySQL. NEW is the new record to be inserted or the updated data. OLD is the deleted record, or the old data before an update. See the documentation for creating a trigger here: http://dev.mysql.com/doc/refman/5.0/en/create

How to create trigger for all table in postgresql?

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问题 I have a trigger, but I need to associate with all tables of the my postgres. Is there a command like this below? CREATE TRIGGER delete_data_alldb BEFORE DELETE ON ALL DATABASE FOR EACH ROW EXECUTE PROCEDURE delete_data(); 回答1: Well there is no database-wide trigger creation but for all such bulk-admin-operations you could use PostgreSQL system tables to generate queries for you instead of writing them by hand. In this case you could run: SELECT 'CREATE TRIGGER ' || tab_name || ' BEFORE

How to use mysqli_sqlstate() to display trigger error message?

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问题 I have Before Insert trigger under certain condition, If condition: false Error occurs. I should display that error message which occurs in database trigger to HTML web page to notify user! CREATE TRIGGER check_trigger BEFORE INSERT ON your_table FOR EACH ROW BEGIN IF (new.ref_owner = new.partnerCodeOwner1) THEN SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'You can not use your ID. Insertion canceled'; END IF; END Here Insertion code! I used mysql_sqlstate() returns the SQLSTATE value But not

How can I find all the db triggers in MySQL?

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I created a trigger using SQL, how can I see the trigger using MySQL in phpMyadmin? Click on the 'SQL' tab and enter this query: SHOW TRIGGERS select * from information_schema.triggers where trigger_schema = 'your_db' Silvio Troia to see all your routines the code is... select * from information_schema.routines 来源： https://stackoverflow.com/questions/5420812/how-can-i-find-all-the-db-triggers-in-mysql