Procedural code automatically executed in response to a database event.

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4
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2answers
3k views

Trigger in MySQL to prevent insertion

I want to create the trigger which prevents insertion in the reservation table of flights (numflights) which does not exist. Tables ---------------------------------------------- flights(numflight, ...
5
votes
3answers
7k views

Disable trigger for just one table

Is it possible to disable a trigger momentarily but for just one table. For example I have table, TableA with an on insert, update and delete trigger. I also have a table B with the same triggers but ...
8
votes
4answers
42k views

Call a stored procedure from a trigger

I have created a stored procedure in mysql using the following syntax. DROP PROCEDURE IF EXISTS `sp-set_comment_count`; DELIMITER $$ CREATE PROCEDURE `sp_set-comment_count` (IN _id INT) BEGIN -- ...
8
votes
2answers
6k views

Performance of a Trigger vs Stored Procedure in MySQL

A post here on DBA.StackExchange (What are the best practices for triggers to maintain a revision number on records?) has spawned an interesting question (at least, interesting to me) regarding ...
4
votes
1answer
11k views

Can mysqldump dump triggers and procedures?

Is there any way of making a mysqldump which will save all the triggers and procedures from a specified db? Some time ago I read that mysqldump will also save my triggers, but it doesn't look like ...
7
votes
1answer
751 views

What is the correct way to ensure unique entries in a temporal database design?

I'm having trouble with the design of a temporal database. I need to know how to make sure I have only one active record for any given timeframe for a store. I have read this answer, but I'm afraid I ...
8
votes
4answers
697 views

How can I know which store procedure or trigger is using a table on SQL Server 2008 R2?

This is the case that in the DB I'm checking, there is an archive table which keeps the user history, and there is a trigger or store procedure that after some time delete rows from this table, in ...
3
votes
3answers
392 views

How to prevent a PostgreSQL trigger from being fired by another trigger?

I have 2 triggers on one table; one works for INSERTs : CREATE TRIGGER "get_user_name" AFTER INSERT ON "field_data" FOR EACH ROW EXECUTE PROCEDURE "add_info"(); This updates some values in the ...
1
vote
2answers
541 views

Assign to NEW by key in a Postgres trigger

In the trigger body, how can I assign a value to NEW by it's field name? That's what I want to do: some_key = "some_column"; NEW[some_key] = 5;
16
votes
1answer
12k views

Trigger in combination with transaction

Suppose we have the following situation: We have a table (let's say Table_A), wich has a trigger on INSERT. The trigger job is to update some rows in table_B based on the inserted values in table_A. ...
8
votes
1answer
2k views

What are the privileges required to execute a trigger function in PostgreSQL 8.4?

What are the privileges required to execute a trigger function in PostgreSQL 8.4? It seems that the privileges set to a role does not matter to execute a trigger function. I think I have seen some ...
2
votes
4answers
31k views

Create a trigger to update table data on another Server's database

I am creating a trigger in MySQL and I need a little help. I have 2 websites, 2 databases (same name) on 2 different web servers, S1 & S2. These databases have the same tables names. I want ...
5
votes
1answer
78 views

How to Choose Between VALUES and SELECT for INSERT?

This answer raised the question for me how to choose between VALUES and SELECT in such a function . Using PostgreSQL 9.4.3 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 4.9.2-10) 4.9.2, 64-bit: ...
5
votes
2answers
4k views

Does a TRIGGER improve the performance?

I understand that TRIGGERs are useful, as they take care of subsequent queries, but do they have an advantage from performance point of view too? Replacing two or three queries as INSERT INTO table1 ...
5
votes
2answers
2k views

Implementing a Circular Buffer (Sliding window) in MySQL

I intend to store some Java objects in a MySQL database, accompanied by a timestamp. These objects should be kept in a Sliding Window fashion (also known as Circular Buffer), meaning that only the ...
5
votes
7answers
496 views

Policies RE database triggers in well-designed applications?

I've heard all kinds of horror stories around gremlins living in database triggers, and--worse--systems being brought down by the addition of a trigger that caused a chain of cascading ones. I'm ...
10
votes
3answers
3k views

How to change the firing order of Triggers?

Realy I rarely use triggers. So I met a problem at first time. I have a lot of tables with triggers (2 or more for every table). I would like to know and change the order of firing triggers for every ...
6
votes
4answers
1k views

Making a column immutable in MySQL

I want to make a column in a relation unmodifyable for consistency reasons. The backstory is that I have a n:n relationship where the "connecting" relation has additional values. I don't want that ...
6
votes
3answers
4k views

Using MySQL triggers or transactions?

I want to ask your opinion in using MySQL triggers or transactions in a website. Actually I have a history payment table with - UserId | OperationId | Comment | Credits | Sign (debit or credit). So ...
3
votes
3answers
142 views

PostgreSQL trigger function that selects from %current% table

I have multiple tables that have the same column names, they only vary in their column values, like: tbl_log_a tbl_log_b tbl_log_c ... 26 tables from a to z. Each table has a trigger that calls a ...
3
votes
1answer
762 views

SELECT in trigger function in two tables

My table and trigger in PostgreSQL 9.4.3 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 4.9.2-10) 4.9.2, 64-bit: CREATE TABLE measurements ( measurement_id SERIAL PRIMARY KEY NOT NULL, ...
3
votes
2answers
3k views

Table data transfer using SSIS and triggers on destination table

I'm a novoice in db operations. SQL Server 2008 R2 is the database I'm using. I need to move selected rows from a staging database table to production database table. I'm using SSIS package to do ...
3
votes
1answer
13k views

Why TRY CATCH does not suppress exception in trigger

I have a trigger on a table (source) that data should be copied to the other one (target) in other database. I am trying to implement custom synchronization process for data: I want that target ...
2
votes
2answers
29 views

MySQL Trigger Query Not Deleting As Expected

I have a test database as shown below. If date is updated in tbl1, I would like for a trigger to fire that removes all entries from tbl2 where tbl1.host = tbl2.host2 AND tbl1.date = NEW.date. This is ...
2
votes
2answers
132 views

Trigger to create a variable Table to be sent to service broker

I've setup a service broker for the first time and tested it... Looks good. Everytime a DML operation happens on a specific table; Let's say the Price Table, a trigger calls a stored procedure passing ...
2
votes
2answers
2k views

PostgreSQL: how do I list all triggers that use a specific field?

for example i have a student table with (studentid) i want to get a list of triggers that use this field... for example if in table X there is a trigger that uses studentid i want it to be shown in ...
2
votes
4answers
575 views

Getting new and updated data with an archive column

I am trying to optimize an SSIS package that retrieves data from a very large transaction table that gets millions of new records daily. The data is being collected from several hundred field servers ...
1
vote
1answer
267 views

mysql trigger / stored procedure - update another table row by row

I've already, searched and read, many answers about this issue for 3 days, but couldn't get a clear answer on how to do this. this will be a little long, be patient please. First of all, I am trying ...
1
vote
1answer
2k views

MYSQL Trigger not working

I am trying to create the following trigger: CREATE TRIGGER update_customers AFTER INSERT ON wp_usermeta FOR EACH ROW BEGIN if new.wp_metakey = first_name then insert into ...
0
votes
1answer
171 views

Trigger function using current row and current table name as variables

Like detailed in my first question I have multiple tables with identical layout in a Postgres 9.1 DB. They only vary in their column values: tbl_log_a tbl_log_b tbl_log_c ... 26 tables (from a to ...
0
votes
1answer
3k views

Launching a python script from an insert trigger [closed]

We have a nice piece of python that sends some emails and interacts with a cloud system. Works fine. But we have to fire it every few minutes to poll the db. We really need, for business purposes, to ...
6
votes
2answers
5k views

Is it possible to get execution call stack in a trigger?

I have 10 stored procedures and each of them does INSERTs into one tableX. Is it possible in a trigger body of tableX to get what object causes modification of tableX (stored proc1 or sp2 or....) ? ...
5
votes
1answer
2k views

How to access NEW or OLD field given only the field's name?

I'm writing a validation trigger. The trigger must validate that the sum of an array equals another field. Since I have many instances of this validation, I want to write a single procedure and create ...
4
votes
3answers
7k views

how to create backup for stored procedure,trigger and functions of a database in sql server 2008?

I'm having 2 databases in 2 different servers(.246 and .252). I need to create backup for all stored procedures, triggers and function from 252 server and restore it in 246 server.database name in ...
2
votes
3answers
3k views

Is it normal to use many Triggers?

I have many so-called summary columns throughout my database to count number of rows in other tables. For example, counting the number of comments by a user (a column in the user table). Currently, I ...
2
votes
3answers
2k views

What are the best practices for triggers to maintain a revision number on records?

I have an audit trail implemented on an application database that captures old value, new value, modification time, and user inserting it into another table. I'm now wanting to add a revision number ...
5
votes
2answers
8k views

Database logon trigger

To block a particular user and IP combination on an Oracle Database , I created the following trigger, and compiled without errors. Create or replace trigger you_may_not_login after logon on database ...
4
votes
1answer
597 views

triggers - using the inserted / deleted tables in Dynamic SQL

Within a trigger, I'm trying to create a unique table name (using the NEWID()) which I can store the data that is found in the inserted and deleted tables. Declare @NewID varchar(50) = ...
4
votes
2answers
3k views

Can a trigger access the query string?

I'm thinking about using triggers as a logging mechanism in MySQL (v. 5.1) and therefore I'd like my trigger to get the query string in order to store it in another tabe. I couldn't find anything ...
3
votes
1answer
192 views

Is Service Broker the best choice for auditing data changes on SQL Server Express?

My project is to audit 5 to 10 existing tables in our system without prolonging transactions. Whatever method is used, it has to work on SQL Server Express 2005 to (eventually) 2016. I've done ...
2
votes
2answers
11k views

Trigger to audit table changes

I have created a trigger to audit changes to a table: CREATE TRIGGER [dbo].[iudt_AutoAuditChanges] ON dbo.CPTCategoryMaster AFTER INSERT,DELETE,UPDATE AS BEGIN SET NOCOUNT ON; ...
2
votes
1answer
10k views

BEFORE INSERT trigger in MySQL

I am new to MySQL and I'm having problems creating a BEFORE INSERT trigger. I get an unexpected END error. I have a table named verlof_aanvragen with a column datum (and 6 more columns). What I ...
1
vote
2answers
808 views

Are there any MySQL Triggers or Events that my program can wait for?

Say I want a live feed of emails on a web based email system. Emails are inserted into MySQL tables. Let's say I want my program to know immediately when the table is updated so it can check for new ...
0
votes
1answer
199 views

What is the best approach to process huge amount of data insertion efficiently

I'm dealing with a HUGE amount of data entry. I need to know the best practice to insert/update table records after new entry inserted in another table. By huge i mean we get more than 2 million ...
-1
votes
2answers
3k views

how to autoincrement varchar datatype depending upon the product details name using trigger

I have a product details table, the fields in the table are *Prod_Id, Product_Name, Quantity, Slno*. Now i have created trigger for varchar data type field and implemented auto increment for Prod_Id ...
9
votes
1answer
3k views

Why am I NOT getting a mutating table error in trigger?

It's (or at least was) known that you cannot use DML statements on a mutating table inside a trigger. An excerpt from the Oracle documentation: A mutating table is a table that is being modified ...
5
votes
2answers
1k views

Federated tables and triggers

This is the scenario. Have two MySQL servers (S1, S2) on different machines, with a database on each (DB1, DB2). I have a table (T2) on DB2 that needs to "fetch" rows from another table (T1) on DB1. ...
3
votes
1answer
80 views

Trigger function using current row and current table name as variables (final part)

Like detailed in my first question I have a Postgres 9.1 database with multiple tables that have the exact same column names, they only vary in their column values: tbl_log_a tbl_log_b tbl_log_c ... ...
2
votes
2answers
240 views

Upgrading a database from SQL Server 2005 to 2012 uncovered a syntax error

I recently upgraded from SQL Server 2005 to 2012. During validation however, a bug was discovered. A certain trigger was coded as follows: CREATE TRIGGER [dbo].[trigger] on [dbo].[foo] FOR UPDATE, ...
2
votes
1answer
165 views

trigger can't access column loop

SSCCE: The following script: $ cat test.sql CREATE TABLE public.foo ( loop INTEGER ); CREATE OR REPLACE FUNCTION public.foo_fun(loop INTEGER) RETURNS BOOLEAN AS $$ SELECT TRUE; $$ LANGUAGE SQL; ...