X-Git-Url: http://git.kpe.io/?p=clsql.git;a=blobdiff_plain;f=sql%2Fconditions.lisp;h=e19805248bd5e6f9601a98db29a3e76157741238;hp=3ef94122cd93c884652c1d994490bea07eba3421;hb=HEAD;hpb=f1d668746523a72a6893a46380468a9e033545e4

diff --git a/sql/conditions.lisp b/sql/conditions.lisp
index 3ef9412..e198052 100644
--- a/sql/conditions.lisp
+++ b/sql/conditions.lisp
@@ -142,3 +142,29 @@ connection is no longer usable."))
 
 (defun signal-database-too-strange (message)
   (error 'database-too-strange :message message))
+
+
+(define-condition sql-value-conversion-error (error)
+  ((expected-type :accessor expected-type :initarg :expected-type :initform nil)
+   (value :accessor value :initarg :value :initform nil)
+   (database :accessor database :initarg :database :initform nil)))
+
+(defun error-converting-value (val type &optional (database *default-database*))
+  (restart-case 
+      (error (make-condition
+              'sql-value-conversion-error
+              :expected-type type :value val :database database))
+    (continue ()
+      :report "Continue using the unconverted value"
+      (values val t))
+    (use-value (new-val)
+      :report "Use a different value instead of this failed conversion"
+      (values new-val t)
+      )))
+
+(defun maybe-error-converting-value
+    (new val type &optional (database *default-database*))
+  (if (typep new type)
+      new
+      (error-converting-value
+       val type database)))