The plot thickens. OrderBy wasn't handling multiple columns properly, which

requires individual ordering instructions for each column. So we've modified it
to do so which required some signature changes and renders the static methods
only really appropriate for a single column (which is what you want 90% of the
time anyway).

src/java/com/samskivert/jdbc/depot/clause/OrderBy.java

@@ -25,6 +25,7 @@ import java.sql.SQLException;
 import java.util.Collection;
 
 import com.samskivert.jdbc.depot.Query;
+import com.samskivert.jdbc.depot.expression.ColumnExp;
 import com.samskivert.jdbc.depot.expression.SQLExpression;
 
 /**
@@ -33,29 +34,45 @@ import com.samskivert.jdbc.depot.expression.SQLExpression;
 public class OrderBy
     implements QueryClause
 {
+    /** Indicates the order of the clause. */
+    public enum Order { ASC, DESC };
+
     /**
-     * Creates and returns an ascending order by clause on the supplied expressions.
+     * Creates and returns an ascending order by clause on the supplied column.
      */
-    public static OrderBy ascending (SQLExpression... values)
+    public static OrderBy ascending (String column)
     {
-        OrderBy clause = new OrderBy(values);
-        clause._ascending = true;
-        return clause;
+        return ascending(new ColumnExp(null, column));
     }
 
     /**
-     * Creates and returns a descending order by clause on the supplied expressions.
+     * Creates and returns a descending order by clause on the supplied column.
      */
-    public static OrderBy descending (SQLExpression... values)
+    public static OrderBy descending (String column)
     {
-        OrderBy clause = new OrderBy(values);
-        clause._ascending = false;
-        return clause;
+        return descending(new ColumnExp(null, column));
     }
 
-    public OrderBy (SQLExpression... values)
+    /**
+     * Creates and returns an ascending order by clause on the supplied expression.
+     */
+    public static OrderBy ascending (SQLExpression value)
+    {
+        return new OrderBy(new SQLExpression[] { value } , new Order[] { Order.ASC });
+    }
+
+    /**
+     * Creates and returns a descending order by clause on the supplied expression.
+     */
+    public static OrderBy descending (SQLExpression value)
+    {
+        return new OrderBy(new SQLExpression[] { value }, new Order[] { Order.DESC });
+    }
+
+    public OrderBy (SQLExpression[] values, Order[] orders)
     {
         _values = values;
+        _orders = orders;
     }
 
     // from QueryClause
@@ -73,8 +90,8 @@ public class OrderBy
                 builder.append(", ");
             }
             _values[ii].appendExpression(query, builder);
+            builder.append(" ").append(_orders[ii]);
         }
-        builder.append(_ascending ? " ASC" : " DESC");
     }
 
     // from QueryClause
@@ -90,6 +107,6 @@ public class OrderBy
     /** The expressions that are generated for the clause. */
     protected SQLExpression[] _values;
 
-    /** Whether the ordering is to be ascending rather than descending. */
-    protected boolean _ascending;
+    /** Whether the ordering is to be ascending or descending. */
+    protected Order[] _orders;
 }