From 02e8f9f8d3276433398bc04bf66ff8e55e8d3d31 Mon Sep 17 00:00:00 2001
From: Constantin Michael <constantin@codesynthesis.com>
Date: Thu, 27 Oct 2011 15:53:35 +0200
Subject: Implement query image change callback machinery

---
 odb/oracle/binding.hxx           |  5 ++++-
 odb/oracle/object-statements.txx |  4 ++++
 odb/oracle/oracle-types.hxx      | 12 ++++++++++++
 odb/oracle/statement.cxx         |  5 +++++
 odb/oracle/view-statements.txx   |  2 ++
 5 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/odb/oracle/binding.hxx b/odb/oracle/binding.hxx
index 778e7fc..64f4782 100644
--- a/odb/oracle/binding.hxx
+++ b/odb/oracle/binding.hxx
@@ -23,9 +23,10 @@ namespace odb
     {
     public:
       typedef oracle::bind bind_type;
+      typedef oracle::change_callback change_callback_type;
 
       binding (bind_type* b, std::size_t n)
-        : bind (b), count (n), version (0)
+        : bind (b), count (n), version (0), change_callback (0)
       {
       }
 
@@ -33,6 +34,8 @@ namespace odb
       std::size_t count;
       std::size_t version;
 
+      change_callback_type* change_callback;
+
     private:
       binding (const binding&);
       binding& operator= (const binding&);
diff --git a/odb/oracle/object-statements.txx b/odb/oracle/object-statements.txx
index 037d82c..948251f 100644
--- a/odb/oracle/object-statements.txx
+++ b/odb/oracle/object-statements.txx
@@ -45,6 +45,8 @@ namespace odb
       id_image_.version = 0;
       id_image_version_ = 0;
 
+      select_image_binding_.change_callback = &image_.change_callback;
+
       std::memset (insert_image_bind_, 0, sizeof (insert_image_bind_));
       std::memset (update_image_bind_, 0, sizeof (update_image_bind_));
       std::memset (select_image_bind_, 0, sizeof (select_image_bind_));
@@ -137,6 +139,8 @@ namespace odb
       select_image_version_ = 0;
       insert_image_version_ = 0;
 
+      select_image_binding_.change_callback = &image_.change_callback;
+
       std::memset (insert_image_bind_, 0, sizeof (insert_image_bind_));
       std::memset (select_image_bind_, 0, sizeof (select_image_bind_));
     }
diff --git a/odb/oracle/oracle-types.hxx b/odb/oracle/oracle-types.hxx
index 1e48129..7f2c46d 100644
--- a/odb/oracle/oracle-types.hxx
+++ b/odb/oracle/oracle-types.hxx
@@ -114,6 +114,18 @@ namespace odb
       //
       lob_context* context;
     };
+
+    // An instance of this structure specifies the function to invoke and
+    // the context to pass just prior to the image associated with a query
+    // is modified.
+    //
+    struct change_callback
+    {
+      change_callback (): callback (0), context (0) {};
+
+      void (*callback) (void*);
+      void* context;
+    };
   }
 }
 
diff --git a/odb/oracle/statement.cxx b/odb/oracle/statement.cxx
index cd09e30..ebddf0c 100644
--- a/odb/oracle/statement.cxx
+++ b/odb/oracle/statement.cxx
@@ -521,6 +521,11 @@ namespace odb
     {
       if (!done_)
       {
+        change_callback* cc (data_.change_callback);
+
+        if (cc != 0 && cc->callback != 0)
+          (cc->callback) (cc->context);
+
         sword r (OCIStmtFetch2 (stmt_,
                                 conn_.error_handle (),
                                 1,
diff --git a/odb/oracle/view-statements.txx b/odb/oracle/view-statements.txx
index 2bf7e68..eefe503 100644
--- a/odb/oracle/view-statements.txx
+++ b/odb/oracle/view-statements.txx
@@ -25,6 +25,8 @@ namespace odb
       image_.version = 0;
       image_version_ = 0;
 
+      image_binding_.change_callback = &image_.change_callback;
+
       std::memset (image_bind_, 0, sizeof (image_bind_));
       std::memset (image_indicator_, 0, sizeof (image_indicator_));
 
-- 
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