subsonicsubsonic2.2adhoc-queries

SubSonic How to Execute a SQL Statement?


My site is using Subsonic 2.2 on my site.

I have 1 weird situation where I need to run some ad-hoc SQL statements.

public IList<string> GetDistincList(string TableName, string FieldName)
{
    string sqlToRun = string.Format("SELECT DISTINCT {0} FROM {1} ORDER BY {0}", FieldName, TableName);

    Query query = new Query(TableName);
    query.PleaseRunThis(sqlToRun);
    query.ExecuteReader();

}

Can anyone help me here? As it appears, I just want to return a generic list of strings.

Thanks!


Solution

  • Subsonic has a great method called ExecuteTypedList() so you can do somethink like this.

    List<int> result = DB.Select(Table.Columns.Id)
      .Distinct()
      .From<Table>()
      .OrderBy(Table.Columns.Id)
      .ExecuteTypedList<int>();
    

    or even with pocos:

    public class UserResult
    {
        public int Id {get;set;}
        public string Name {get;set;}
    }
    
    
    List<UserResult> users = DB.Select(
           User.Columns.UserId + " as Id",     // the as ... is only needed if your
           User.Columns.UserName + " as Name"  // column name differs from the
       ).From<User>()                          // property name of your class
        .ExecuteTypedList<UserResult>();
    

    Unfortunately this method doesn't work for string since it requires a) a valuetype b) a class with a parameterless constructor since the method uses reflection to map the columns from the result to the properties of the class

    However I wrote an extension method a while ago that works for string:

    Use the Subsonic.Select() ExecuteTypedList Method with String

    Look at my own answer in the link.

    If you add the extensionmethod to your code you can do:

     List<String> result = DB.Select(User.Columns.UserName)
                             .From<User>()
                             .ExecuteTypedList();