Add API for returning Count of all Rows

Author: mythz

src/ServiceStack.OrmLite/Expressions/ReadConnectionExtensions.cs

@@ -218,6 +218,21 @@ public static long Count<T>(this IDbConnection dbConn)
             return dbConn.Exec(dbCmd => dbCmd.Count(expression));
         }
 
+        /// <summary>
+        /// Return the number of rows returned by the supplied expression
+        /// </summary>
+        public static long RowCount<T>(this IDbConnection dbConn, SqlExpression<T> expression)
+        {
+            return dbConn.Exec(dbCmd => dbCmd.RowCount(expression));
+        }
+
+        /// <summary>
+        /// Return the number of rows returned by the supplied sql
+        /// </summary>
+        public static long RowCount(this IDbConnection dbConn, string sql)
+        {
+            return dbConn.Exec(dbCmd => dbCmd.RowCount(sql));
+        }
 
         /// <summary>
         /// Returns results with references from using a LINQ Expression. E.g:

src/ServiceStack.OrmLite/Expressions/ReadExtensions.cs

@@ -121,6 +121,25 @@ internal static long GetCount(this IDbCommand dbCmd, string sql)
             return dbCmd.Column<long>(sql).Sum();
         }
 
+        internal static long RowCount<T>(this IDbCommand dbCmd, SqlExpression<T> expression)
+        {
+            var sql = expression.Clone().Select("1").ToSelectStatement();
+            return RowCount(dbCmd, sql);
+        }
+
+        internal static long RowCount(this IDbCommand dbCmd, string sql)
+        {
+            var rowCount = 0;
+            using (var reader = dbCmd.ExecReader(sql))
+            {
+                while (reader.Read())
+                {
+                    rowCount++;
+                }
+            }
+            return rowCount;
+        }
+
         internal static List<T> LoadSelect<T>(this IDbCommand dbCmd, Func<SqlExpression<T>, SqlExpression<T>> expression)
         {
             var expr = OrmLiteConfig.DialectProvider.SqlExpression<T>();