Introduced a new Update method which takes a dictionary of string/object pairs (uses parameters on command, so it should have better support for long parameter values).

Author: Alex Henderson

src/Migrator.Framework/ITransformationProvider.cs

@@ -464,6 +464,16 @@ void GenerateForeignKey(string foreignTable, string foreignColumn, string primar
 		/// <returns></returns>
 		int Update(string table, string[] columns, string[] values, string where);
 
+        /// <summary>
+        /// Update the values in a table, values are passed as objects so they can be
+        /// passed by param in the underlying implementation
+        /// </summary>
+        /// <param name="table"></param>
+        /// <param name="where"></param>
+        /// <param name="changes"></param>
+        /// <returns></returns>
+	    int Update(string table, string where, Dictionary<string,object> changes);
+
 		/// <summary>
 		/// Get a command instance
 		/// </summary>

src/Migrator.Providers/NoOpTransformationProvider.cs

@@ -247,7 +247,12 @@ public int Update(string table, string[] columns, string[] columnValues, string
 			return 0;
 		}
 
-		public int Delete(string table, string[] columns, string[] columnValues)
+	    public int Update(string table, string @where, Dictionary<string, object> changes)
+	    {
+	        return 0;
+	    }
+
+	    public int Delete(string table, string[] columns, string[] columnValues)
 		{
 			return 0;
 		}

src/Migrator.Providers/TransformationProvider.cs

@@ -626,7 +626,54 @@ public virtual int Update(string table, string[] columns, string[] values, strin
 			return ExecuteNonQuery(String.Format(query, table, namesAndValues));
 		}
 
-		public virtual int Insert(string table, string[] columns, object[] values)
+	    public virtual int Update(string table, string where, Dictionary<string, object> changes)
+        {
+            if (string.IsNullOrEmpty(table)) throw new ArgumentNullException("table");
+            
+            table = QuoteTableNameIfRequired(table);
+
+            var sets = new StringBuilder();
+
+	        var columns = changes.Keys.ToArray();
+
+	        for (int i = 0; i < columns.Length; i++)
+	        {
+	            var column = columns[i];
+                if (sets.Length > 0) sets.Append(",\r\n");
+	            sets.AppendFormat("{0} = {1}", QuoteColumnNameIfRequired(column), GenerateParameterName(i));
+	        }
+
+	        var query = String.Format("UPDATE {0} SET {1} ", table, sets);
+
+	        if (!string.IsNullOrWhiteSpace(where))
+	        {
+	            query += "\r\n WHERE " + where;
+	        }
+
+            using (IDbCommand command = _connection.CreateCommand())
+            {
+                command.Transaction = _transaction;
+                command.CommandText = query;
+                command.CommandType = CommandType.Text;
+                
+                for (int paramCount = 0; paramCount < columns.Length; paramCount++)
+                {
+                    var value = changes[columns[paramCount]];                
+
+                    IDbDataParameter parameter = command.CreateParameter();
+                    
+                    ConfigureParameterWithValue(parameter, paramCount, value);
+
+                    parameter.ParameterName = GenerateParameterName(paramCount);
+
+                    command.Parameters.Add(parameter);
+                }
+
+                return command.ExecuteNonQuery();
+            }
+	    }
+
+	    public virtual int Insert(string table, string[] columns, object[] values)
 		{
 			if (string.IsNullOrEmpty(table)) throw new ArgumentNullException("table");
 			if (columns == null) throw new ArgumentNullException("columns");