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Data retrieval: SELECT

The SELECT statement allows you to retrieve information from the database. This section describes how to execute a SELECT statement and how to handle the result set it returns.

To execute a SELECT statement

1. Declare a ULCommand object, which holds the query.

   ULCommand cmd;

2. Assign a statement to the object.

   cmd = conn.CreateCommand();
   cmd.Command =
      "SELECT MyColumn FROM MyTable";

3. Execute the statement.

   Query results can be returned as one of several types of objects. In this example, a ULDataReader object is used. In the following code, the result of the SELECT statement contains a string, which is output to the console window.

   ULDataReader customerNames = prepStmt.ExecuteReader();
   int fc = customerNames.GetFieldCount();
   while( customerNames.MoveNext() ) {
     for ( int i = 0; 
       i < fc; 
       i++ ) {
       System.Console.Write(
       customerNames.GetString( i ) + " " );
     }
     System.Console.WriteLine();
   }