How do you call a function in mysql?
If I call a function several time then will it execute every time or just execute once and the value will be used then after several time? Example: Show
My question is
asked Jan 16, 2013 at 10:53
1 Why not use a variable that catch the value of your function. For example:
in that case, you'll be going to reuse the function result and no need to repeat the process of the function.
Blue 22.2k7 gold badges56 silver badges87 bronze badges answered Mar 13, 2014 at 2:16
wedev27wedev27 2432 silver badges7 bronze badges It is possible to have some optimization if you declare your function as
answered Jan 16, 2013 at 11:02
triclosantriclosan 5,4466 gold badges25 silver badges49 bronze badges 1 As far as I know (not a mysql pro) it is calling this function every time. Your expalin plan should show that issue. If you always call the function with the same argument, rather query it once per row via a sub-query.
answered Jan 16, 2013 at 10:58
NajzeroNajzero 3,14417 silver badges18 bronze badges It's very simple to run the MySQL function. Login to MySQL command prompt using command:
Then use the database using:
Then run the MySQL function using:
Instead of procedure we can add any multiple line function in above example. answered May 16, 2015 at 1:14
Sumit MunotSumit Munot 3,6601 gold badge29 silver badges51 bronze badges 2 How do you call a function in a database?How to call an existing function in a database using JDBC API?. Connect to the database.. Create a PreparedStatement object and to its constructor pass the function call in String format.. Set values to the place holders.. Execute the Callable statement.. How do you create a function and call in MySQL?The syntax to create a function in MySQL is: CREATE FUNCTION function_name [ (parameter datatype [, parameter datatype]) ] RETURNS return_datatype BEGIN declaration_section executable_section END; function_name. The name to assign to this function in MySQL.
How do you execute a function in SQL?How to execute user-defined function in SQL with parameters. We create a function with the CREATE FUNCTION statement.. We give a name to the function.. We specify input parameters along with their data types.. We specify the data type of the value that the function will return.. How do you call a stored function in SQL?How To Call A Function In SQL Server Stored procedure. create function function_to_be_called(@username varchar(200)). returns varchar(100). begin.. declare @password varchar(200). set @password=(select [password] from [User] where username =@username). return @password.. |