Consider a Winforms app connecting to a SQL Server 2008 database and running a SQL SELECT
statement:
string myConnectionString = "Provider=SQLOLEDB;Data Source=hermes;Initial Catalog=qcvaluestest;Integrated Security=SSPI;";
string mySelectQuery = "SELECT top 500 name, finalconc from qvalues where rowid between 0 and 25000;";
OleDbConnection myConnection = new OleDbConnection(myConnectionString);
OleDbCommand myCommand = new OleDbCommand(mySelectQuery, myConnection);
myCommand.Connection.Open();
OleDbDataReader myReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
How can you read the results of the query into a list?
Assume you have defined a class that is something like
class MyData
{
public string Name {get; set;}
public int FinalConc {get; set;} // or whatever the type should be
}
You would iterate through the results of your query to load a list.
List<MyData> list = new List<MyData>();
while (myReader.Read())
{
MyData data = new MyData();
data.Name = (string)myReader["name"];
data.FinalConc = (int)myReader["finalconc"]; // or whatever the type should be
list.Add(data);
}
// work with the list
If you just need one of the given fields, you can forego the class definition and simply have a List<T>
, where T
is the type of whatever field you want to hold.