NULL handling improvements

Add support for specifying NULL-ness for types with built-in mapping.
Handle Oracle [N]VARCHAR2 and SQLite FLOAT oddities using this mechanism
instead of overriding it at the schema generation level.

Also use the is_null argument that is passed to value_traits::init_image()
to indicate whether the value can be NULL.

1 files changed, 2 insertions, 0 deletions

diff --git a/oracle/types/driver.cxx b/oracle/types/driver.cxx
index b1ca3ad..554c506 100644
--- a/oracle/types/driver.cxx
+++ b/oracle/types/driver.cxx
@@ -63,6 +63,8 @@ main (int argc, char* argv[])
     o.nvarchar2_ = medium_str;
     o.nclob_.assign (vlong_str.data (), vlong_str.data () + vlong_str.size ());
 
+    o.empty_c_.push_back ("");
+
     o.raw_.assign (long_str.data (), long_str.data () + long_str.size ());
     o.blob_.assign (vlong_str.data (), vlong_str.data () + vlong_str.size ());