X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=sql%2Fexpressions.lisp;h=9335ae0e0a5e0995357da7cabaa331de00778950;hb=2c69ef4d171d214a7d54b598184dadb864704852;hp=bee6faffafa22dfc543255d3892890a2ce4736cd;hpb=d86f73be9a261b9c071ab905aeff5d1ee30a3f31;p=clsql.git

diff --git a/sql/expressions.lisp b/sql/expressions.lisp
index bee6faf..9335ae0 100644
--- a/sql/expressions.lisp
+++ b/sql/expressions.lisp
@@ -139,11 +139,9 @@
 
 
 (defvar *output-hash*
-  #+sbcl
-  (make-hash-table :test #'equal :synchronized T :weakness :key-and-value)
-  #-sbcl
-  (make-hash-table :test #'equal )
-  "For caching generated SQL strings.")
+      (make-weak-hash-table :test #'equal)
+  "For caching generated SQL strings, set to NIL to disable."
+  )
 
 (defmethod output-sql :around ((sql t) database)
   (if (null *output-hash*)
@@ -675,6 +673,20 @@ uninclusive, and the args from that keyword to the end."
                            :group-by group-by :having having :order-by order-by
                            :inner-join inner-join :on on))))))
 
+(defun output-sql-where-clause (where database)
+  "ensure that we do not output a \"where\" sql keyword when we will
+    not output a clause. Also sets *in-subselect* to use SQL
+    parentheticals as needed."
+  (when where
+    (let ((where-out (string-trim
+		      '(#\newline #\space #\tab #\return)
+		      (with-output-to-string (*sql-stream*)
+			(let ((*in-subselect* t))
+			  (output-sql where database))))))
+      (when (> (length where-out) 0)
+	(write-string " WHERE " *sql-stream*)
+	(write-string where-out *sql-stream*)))))
+
 (defmethod output-sql ((query sql-query) database)
   (with-slots (distinct selections from where group-by having order-by
                         limit offset inner-join on all set-operation)
@@ -714,15 +726,7 @@ uninclusive, and the args from that keyword to the end."
     (when on
       (write-string " ON " *sql-stream*)
       (output-sql on database))
-    (when where
-      (let ((where-out (string-trim
-                        '(#\newline #\space #\tab #\return)
-                        (with-output-to-string (*sql-stream*)
-                          (let ((*in-subselect* t))
-                            (output-sql where database))))))
-        (when (> (length where-out) 0)
-          (write-string " WHERE " *sql-stream*)
-          (write-string where-out *sql-stream*))))
+    (output-sql-where-clause where database)
     (when group-by
       (write-string " GROUP BY " *sql-stream*)
       (if (listp group-by)
@@ -834,9 +838,7 @@ uninclusive, and the args from that keyword to the end."
     (typecase from
       ((or symbol string) (write-string (sql-escape from) *sql-stream*))
       (t  (output-sql from database)))
-    (when where
-      (write-string " WHERE " *sql-stream*)
-      (output-sql where database)))
+    (output-sql-where-clause where database))
   t)
 
 ;; UPDATE
@@ -869,9 +871,7 @@ uninclusive, and the args from that keyword to the end."
       (output-sql table database)
       (write-string " SET " *sql-stream*)
       (output-sql (apply #'vector (update-assignments)) database)
-      (when where
-        (write-string " WHERE " *sql-stream*)
-        (output-sql where database))))
+      (output-sql-where-clause where database)))
   t)
 
 ;; CREATE TABLE