Sequence support for Ingres9

Author: gamblen

src/NHibernate/Dialect/Ingres9Dialect.cs

@@ -30,7 +30,15 @@ public override bool SupportsLimitOffset
 		{
 			get { return true; }
 		}
-		
+
+		/// <summary>
+		/// Does this dialect support sequences?
+		/// </summary>
+		public override bool SupportsSequences
+		{
+			get { return true; }
+		}
+
 		/// <summary>
 		/// Attempts to add a <c>LIMIT</c> clause to the given SQL <c>SELECT</c>.
 		/// Expects any database-specific offset and limit adjustments to have already been performed (ex. UseMaxForLimit, OffsetStartsAtOne).
@@ -64,5 +72,32 @@ public override SqlString GetLimitString(SqlString queryString, SqlString offset
 
 			return pagingBuilder.ToSqlString();
 		}
+
+		/// <summary> 
+		/// Generate the appropriate select statement to retrieve the next value
+		/// of a sequence.
+		/// </summary>
+		/// <param name="sequenceName">the name of the sequence </param>
+		/// <returns> String The "nextval" select string. </returns>
+		/// <remarks>This should be a "stand alone" select statement.</remarks>
+		public override string GetSequenceNextValString(string sequenceName)
+		{
+			return "select " + GetSelectSequenceNextValString(sequenceName) + " as seq";
+		}
+
+		/// <summary> 
+		/// Generate the select expression fragment that will retrieve the next
+		/// value of a sequence as part of another (typically DML) statement.
+		/// </summary>
+		/// <param name="sequenceName">the name of the sequence </param>
+		/// <returns> The "nextval" fragment. </returns>
+		/// <remarks>
+		/// This differs from <see cref="GetSequenceNextValString"/> in that this
+		/// should return an expression usable within another statement.
+		/// </remarks>
+		public override string GetSelectSequenceNextValString(string sequenceName)
+		{
+			return "next value for " + sequenceName;
+		}
 	}
-}
+}