How to check value of column is false i want to insert my data

Question

I am creating C# application if the last value of trigger_0 is False insert my current date and time, help me to solve this:

        String test = DateTime.Now.ToShortDateString();
        String test1 = DateTime.Now.ToString("hh:mm");
        con.Open();
        SqlCommand cmdt = con.CreateCommand();
        cmdt.CommandType = CommandType.Text;
        cmdt.CommandText = "SELECT TOP 1 trigger_0 FROM WINDATAA  ORDER BY trigger_0 DESC ";
        cmdt.ExecuteNonQuery();
        con.Close();

Answer 1

I guess you are trying to update all rows:

UPDATE WINDATAA
SET [date] = CONVERT(VARCHAR(10), GETUTCDATE(), 121)
   ,[time] = LEFT(CAST(GETUTCDATE() AS TIME), 5)
WHERE [triggger_0] = 'false' -- or [triggger_0] = 0 if boolean

If you need to modify only the last, you can use some id if you have, or get the maximum/last date in advanced and use the value in the WHERE clause.

Answer 2

Just get result from your executed query and see whether it is true . If true then just insert your data:

bool trigger = true;
SqlCommand cmdt = con.CreateCommand();
cmdt.CommandType = CommandType.Text;
var result = cmdt.ExecuteScalar();       
bool.TryParse(result, out trigger);
if (trigger == false) {
    // insert your data. For example:
   string query = "INSERT INTO dbo.FooTable (id,username) VALUES (@id,@username)"; 
   SqlCommand command = new SqlCommand(query, db.Connection);
   string preventNull = null;
   preventNull = preventNull == null ? "Is not null" : "Hey!";
   string fooUserName = null;
   fooUserName = fooUserName == null ? "Bob not null" : "Hey!";
   command.Parameters.Add("@id", preventNull );
   command.Parameters.Add("@username", fooUserName );      
   command.ExecuteNonQuery();
}

Answer 3

If I understand it properly you want to check if the last created item in your table has a value true or false. If the field time in your database describes the creation time you can just order the items by date and time eg

SELECT TOP 1 trigger_0 FROM WINDATAA  ORDER BY date, time DESC 

Another option I see is if the id of your table is an integer then you can just order the items by Id:

SELECT TOP 1 trigger_0 FROM WINDATAA  ORDER BY Id DESC 

Then you can create a statement in C#, and use the data of the object if it's needed