Add support for constructing delete_statement with native binding only

This is similar to what we do in select_statement.

2 files changed, 24 insertions, 3 deletions

diff --git a/odb/pgsql/statement.cxx b/odb/pgsql/statement.cxx
index f9a4fb7..26ae475 100644
--- a/odb/pgsql/statement.cxx
+++ b/odb/pgsql/statement.cxx
@@ -572,7 +572,20 @@ namespace odb
                       binding& cond,
                       native_binding& native_cond)
         : statement (conn, name, stmt, types, types_count),
-          cond_ (cond),
+          cond_ (&cond),
+          native_cond_ (native_cond)
+    {
+    }
+
+    delete_statement::
+    delete_statement (connection& conn,
+                      const string& name,
+                      const string& stmt,
+                      const Oid* types,
+                      size_t types_count,
+                      native_binding& native_cond)
+        : statement (conn, name, stmt, types, types_count),
+          cond_ (0),
           native_cond_ (native_cond)
     {
     }
@@ -580,7 +593,8 @@ namespace odb
     unsigned long long delete_statement::
     execute ()
     {
-      bind_param (native_cond_, cond_);
+      if (cond_ != 0)
+        bind_param (native_cond_, *cond_);
 
       result_ptr r (PQexecPrepared (conn_.handle (),
                                     name_.c_str (),
diff --git a/odb/pgsql/statement.hxx b/odb/pgsql/statement.hxx
index 3a25f5e..11e04b3 100644
--- a/odb/pgsql/statement.hxx
+++ b/odb/pgsql/statement.hxx
@@ -246,6 +246,13 @@ namespace odb
                         binding& cond,
                         native_binding& native_cond);
 
+      delete_statement (connection& conn,
+                        const std::string& name,
+                        const std::string& stmt,
+                        const Oid* types,
+                        std::size_t types_count,
+                        native_binding& native_cond);
+
       unsigned long long
       execute ();
 
@@ -254,7 +261,7 @@ namespace odb
       delete_statement& operator= (const delete_statement&);
 
     private:
-      binding& cond_;
+      binding* cond_;
       native_binding& native_cond_;
     };
   }