I have always wanted this constructor. I'm adding it.

RFC: I'm continuing to enforce that you must pass at least
one SQLExpression, but if we didn't care this could be a bit
more straightforward in the form:

    public Where (SQLExpression<?>... andConditions)

It could then use that array directly for the Ops.and(), but also
people would be able to make a "where true" by just constructing
a Where with no args and I'm not sure mdb is down with that.

src/main/java/com/samskivert/depot/clause/Where.java

@@ -6,6 +6,8 @@ package com.samskivert.depot.clause;
 
 import java.util.Collection;
 
+import com.google.common.collect.Lists;
+
 import com.samskivert.depot.Ops;
 import com.samskivert.depot.PersistentRecord;
 import com.samskivert.depot.expression.ColumnExp;
@@ -51,6 +53,11 @@ public class Where extends WhereClause
         _condition = condition;
     }
 
+    public Where (SQLExpression<?> condition1, SQLExpression<?>... andConditions)
+    {
+        _condition = Ops.and(Lists.asList(condition1, andConditions));
+    }
+
     @Override // from WhereClause
     public SQLExpression<?> getWhereExpression ()
     {