I have a trigger in which I want to have a variable that holds an INT I get from a Show
Kenny Linsky 1,6683 gold badges17 silver badges41 bronze badges asked Nov 27, 2008 at 20:33 You can declare local variables in MySQL triggers, with the Here's an example:
When you assign a value to a variable, you must ensure that the query returns only a
single value, not a set of rows or a set of columns. For instance, if your query returns a single value in practice, it's okay but as soon as it returns more than one row, you get " You can use
answered Nov 29, 2008 at 23:29
Bill KarwinBill Karwin 511k83 gold badges644 silver badges803 bronze badges 8
Dont try this @ home
outis 73.3k20 gold badges146 silver badges216 bronze badges answered May 15, 2009 at 12:43
answered Nov 27, 2008 at 21:58
IgorSIgorS 1738 bronze badges 1 I'm posting this solution because I had a hard time finding what I needed. This post got me close enough (+1 for that thank you), and here is the final solution for rearranging column data before insert if the data matches a test. Note: this is from a legacy project I inherited where:
Anyway, here is the trigger that puts any duplicate keys into a legacy column while allowing us to store the legacy, bad data (and not trigger the gaining tables composite, unique key).
answered Dec 20, 2016 at 15:42
WEBjujuWEBjuju 5,2454 gold badges26 silver badges34 bronze badges Or you can just include the SELECT statement in the SQL that's invoking the trigger, so its passed in as one of the columns in the trigger row(s). As long as you're certain it will infallibly return only one row (hence one value). (And, of course, it must not return a value that interacts with the logic in the trigger, but that's true in any case.) answered Nov 27, 2008 at 23:29
dkretzdkretz 37.1k13 gold badges79 silver badges136 bronze badges As far I think I understood your question I believe that u can simply declare your variable inside "DECLARE" and then after the "begin" u can use 'select into " you variable" ' statement. the code would look like this:
answered Jul 1, 2020 at 7:34
1 How do I assign a value to a variable in MySQL trigger?DECLARE CustomerId integer; and SET @CustomerId := are two different variables. First is declared variable local to compound statement, second in user-defined variable local to connection. ... . Hi Akina Thanks for the replying. ... . Simply SELECT CustomerID INTO CustomerId FROM Seller WHERE Id = NEW. ... . I did but Same issue happens.. Can we use trigger with SELECT statement?The trigger event that initiates the trigger action can be an INSERT, DELETE, UPDATE, or a SELECT statement. The MERGE statement can also be the triggering event for an UPDATE, DELETE, or INSERT trigger.
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Usage.. How do you insert values into a table using triggers?To create a trigger, we need to change the delimiter. Inserting the row into Table1 activates the trigger and inserts the records into Table2. To insert record in Table1. To check if the records are inserted in both tables or not.
What is Definer in MySQL trigger?The DEFINER clause specifies the MySQL account to be used when checking access privileges at trigger activation time. If the DEFINER clause is present, the user value should be a MySQL account specified as ' user_name '@' host_name ' , CURRENT_USER , or CURRENT_USER() .
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