Question

Postgresql trigger and function (stored procedure)

Asked by: Joel_Sisko

Dear Experts,

I need to create a trigger and subsequent function of some sort that will pass a value from a given query to a simple php script.

First, can a trigger be applied to a specific field in a row or must it be applied to the entire row within a table?

Assuming that the trigger is based on the row, I need the trigger to be triggered when data is inserted into the table creating a new record. Then the trigger needs to trigger a function (stored procedure) that will pass two values from the row, first being the recordID and then membershipnumber to a simple php scipt that will take these two values and provide another service that we create. The values can be passed into the script using the field names as the variable names.

The name of the table is called NewUserMessages and the field names are recordID and membershipnumber.
Thanks for the help in advance.

Joel

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Asked On
2009-08-13 at 16:52:04ID24651645
Tags

Postgresql

Topic

PostgreSQL Database

Participating Experts
3
Points
500
Comments
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Answers

 

by: gheistPosted on 2009-08-14 at 06:57:18ID: 25098056

 

by: Joel_SiskoPosted on 2009-08-14 at 10:54:06ID: 25100540

Yeah already seen those links. So need some guidance.

Joel

 

by: ivanovnPosted on 2009-08-18 at 07:50:55ID: 25123840

The triggers can be row triggers or statement triggers. I am not sure what would be the benefit of a field trigger. If you do a row trigger you can always check what the old and new value of a particular field is and perform actions based on that.

Basically you would create an after insert trigger that would then call whatever stored procedure you want with given arguments. Look at the dummy code below for some guidance.

CREATE FUNCTION t1() RETURNS trigger AS $$
    BEGIN
        -- Do some processing here if needed (just an example)
        IF NEW."recordID" IS NULL THEN
            RAISE EXCEPTION 'recordID cannot be null';
        END IF;
        IF NEW.membershipnumber IS NULL THEN
            RAISE EXCEPTION 'membershipnumber cannot be null';
        END IF;
 
        -- Call your function
        SELECT f1(NEW."recordID", NEW.membershipnumber);
 
    END;
$$ LANGUAGE plpgsql;
 
CREATE TRIGGER trig1 AFTER INSERT ON "NewUserMessages"
    FOR EACH ROW EXECUTE PROCEDURE t1();

                                              
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by: earthman2Posted on 2009-08-19 at 23:55:44ID: 25139821

Consider whether your Trigger function needs to  return NEW else database will not update.
NEW column values  can be compared to OLD values like this.

CREATE FUNCTION t1() RETURNS trigger AS $$
BEGIN
      IF NEW."recordID" IS NULL THEN
          RAISE EXCEPTION 'recordID cannot be null';
      END IF;
      IF NEW.membershipnumber <> OLD.membershipnumber THEN
          SELECT f1(NEW."recordID", NEW.membershipnumber);
      END IF;
     RETURN NEW;  -- need this or nothing happens
END;
$$ LANGUAGE plpgsql

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