Auto-abort transactions on close, support call chaining when beginnin…

…g a transaction.

src/main/java/myworld/spruce/DBContext.java

@@ -60,9 +60,10 @@ public <T extends DBModule> T getModule(Class<T> moduleType){
         return module;
     }
 
-    public void beginTransaction() throws SQLException {
+    public DBContext beginTransaction() throws SQLException {
         conn.setAutoCommit(false);
         inTransaction = true;
+        return this;
     }
 
     public void abortTransaction() throws SQLException {
@@ -148,7 +149,7 @@ public void close() throws SQLException {
             }
         }
         if(inTransaction){
-            throw new SQLException("Context cannot be closed with an active transaction. Abort or commit before closing.");
+            abortTransaction();
         }
         conn.close();
     }