Added query function for easier queries.

Normalized method names in GroupManager.cs

TShockAPI/DB/DbExt.cs

@@ -7,7 +7,45 @@ using System.Text;
 namespace TShockAPI.DB
 {
     public static class DbExt
-    {
+    {    
+
+        /// <summary>
+        /// Executes a query on a database.
+        /// </summary>
+        /// <param name="db">Database to query</param>
+        /// <param name="query">Query string with parameters as @0, @1, etc.</param>
+        /// <param name="args">Parameters to be put in the query</param>
+        /// <returns>Rows affected by query</returns>
+        public static int Query(this IDbConnection db, string query, params object[] args)
+        {
+            using (var com = db.CreateCommand())
+            {
+                com.CommandText = query;
+                for (int i = 0; i < args.Length; i++)
+                    com.AddParameter("@" + i, args[i]);
+
+                return com.ExecuteNonQuery();
+            }
+        }
+        /// <summary>
+        /// Executes a query on a database.
+        /// </summary>
+        /// <param name="db">Database to query</param>
+        /// <param name="query">Query string with parameters as @0, @1, etc.</param>
+        /// <param name="args">Parameters to be put in the query</param>
+        /// <returns>Query result as IDataReader</returns>
+        public static IDataReader QueryReader(this IDbConnection db, string query, params object[] args)
+        {
+            using (var com = db.CreateCommand())
+            {
+                com.CommandText = query;
+                for (int i = 0; i < args.Length; i++)
+                    com.AddParameter("@" + i, args[i]);
+
+                return com.ExecuteReader();
+            }
+        }
+
         public static IDbDataParameter AddParameter(this IDbCommand command, string name, object data)
         {
             var parm = command.CreateParameter();