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SQL "if exists..." dynamic query


SQL "if exists..." dynamic query

By : Beeman
Date : November 22 2020, 01:01 AM
Does that help Try Executing the Dynamic query and use @@RowCount to find the existence of rows.
code :
DECLARE @Query  NVARCHAR(1000) = 'SELECT * FROM [dbo].[Mytable]',
        @rowcnt INT

EXEC Sp_executesql @query

SELECT @rowcnt = @@ROWCOUNT

IF @rowcnt > 0
  BEGIN
      PRINT 'row present'
  END 


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Dynamic JQuery query generation to "disable" a drop down "option" in JSP

Dynamic JQuery query generation to "disable" a drop down "option" in JSP


By : buykamagrapolo
Date : March 29 2020, 07:55 AM
will help you I have resolved the error :)
So the method mapForId() was appending the option# in front of the attr along with the id, so I made a change and it started working properly.
How to use conditional statement "if not exists" in dynamic sql query within stored procedure?

How to use conditional statement "if not exists" in dynamic sql query within stored procedure?


By : user2110696
Date : March 29 2020, 07:55 AM
I wish this help you I have something like this. , Just combine to queries together.
code :
SET @FinalQuery NVARCHAR(MAX) = @ifQuery + @insertQuery;
EXEC (@FinalQuery);
How to execute dynamic query with sql""select c from T""".as[T] interpolation in slick

How to execute dynamic query with sql""select c from T""".as[T] interpolation in slick


By : Sam Hage
Date : March 29 2020, 07:55 AM
To fix the issue you can do I am trying to implement a function with Slick3 to return a tuple. , You have to provide the GetResult function for your type T:
code :
def executeQueryConfig2[T:ClassTag](sql: String, f: Option[T] => Unit)
    (implicit rconv: GetResult[T]): Future[T] = {
  val action2 = sql"""$sql""".as[T].headOption
  db.run(action2).mapTo[T].map(f(_)).recover{ case e: SQLException => println(e.getMessage) }
}
"IF EXISTS" in PostgreSQL - creating query that updates a record if exists and inserts into if not

"IF EXISTS" in PostgreSQL - creating query that updates a record if exists and inserts into if not


By : K W
Date : March 29 2020, 07:55 AM
should help you out From your SQL code it is easy to tell that you are experienced in procedural programming languages. PL/pgSQL requires a different mindset though. Carefully read the docs on PL/pgSQL programming and start thinking in sets and operations that succeed or fail. This is not at all meant to belittle you; take it as well-intended advice from a fellow programmer who has seen both sides of the fence.
In this case, simply try the UPDATE and if it fails, do an INSERT instead.
code :
DO $do$
DECLARE
    obs timestamp := to_timestamp('06.07.2016 23:28:43', 'DD.MM.YYYY HH24:MI:SS');
BEGIN
    UPDATE public.measurement_pm2_5   
    SET measurement_value = 27  
    WHERE measurement_time = date_trunc('second', obs)
    AND   sensor_id = 2;

    IF NOT FOUND THEN   
        INSERT INTO public.measurement_pm2_5
               (sensor_id, measurement_time, measurement_value)  
        VALUES (2, obs, 27);  
    END IF;
END;
$do$ LANGUAGE plpgsql;
Why does ActiveRecord fail to create with error "x must exist" but the query "x.exists?" returns tru

Why does ActiveRecord fail to create with error "x must exist" but the query "x.exists?" returns tru


By : user2959562
Date : March 29 2020, 07:55 AM
wish of those help I must be missing something really obvious, but here goes: , As per the docs on the belongs_to method:
code :
def belongs_to(name, scope = nil, **options)
  reflection = Builder::BelongsTo.build(self, name, scope, options)
  Reflection.add_reflection self, name, reflection
end
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