Add descriptor management flags for TIMESTAMP and INTERVAL image types

For a query expression that has only by-value parameters, we guarantee
that it can be used by multiple threads. However, the way we handle
TIMESTAMP and INTERVAL types now requires the modification of the image
during query execution. To resolve this, the datetime, interval_ym,
and interval_ds image types now have flags that allow the query
implementation to avoid the modification.

1 files changed, 9 insertions, 0 deletions

diff --git a/odb/oracle/statement.hxx b/odb/oracle/statement.hxx
index 8d97ab4..3687728 100644
--- a/odb/oracle/statement.hxx
+++ b/odb/oracle/statement.hxx
@@ -50,6 +50,12 @@ namespace odb
       init (const char* text, std::size_t text_size);
 
     protected:
+      struct unbind
+      {
+        oracle::bind* bind;  // Corresponding bind entry.
+        void* value;         // Actual value passed to OCIBindByPos.
+      };
+
       // Bind parameters for this statement. This function must only
       // be called once. Multiple calls to it will result in memory
       // leaks due to lost OCIBind resources.
@@ -85,6 +91,9 @@ namespace odb
     protected:
       connection& conn_;
       auto_handle<OCIStmt> stmt_;
+
+      unbind* udata_;
+      std::size_t usize_;
     };
 
     class LIBODB_ORACLE_EXPORT generic_statement: public statement