added transactions, cleanup of finalizers, addition of pget, in process of adding many other API calls

bdb.h

@@ -22,21 +22,34 @@
 #define filename_dup(fpd,fps) \
   strncpy(fpd,fps,FNLEN);
 
+typedef struct s_envh {
+  VALUE self;
+  DB_ENV *env;
+  VALUE adb; /* Ruby array holding opened databases */
+  VALUE atxn; /* Ruby array holding open transactions */
+} t_envh;
+
 typedef struct s_dbh {
-  VALUE dbinst;
-  DB *dbp;
+  VALUE self;
+  DB *db;
   VALUE aproc;
+  t_envh *env; /* Parent environment, NULL if not opened from one */
+  VALUE adbc; /* Ruby array holding opened cursor */
   char filename[FNLEN+1];
 } t_dbh;
 
 typedef struct s_dbch {
+  VALUE self;
   DBC *dbc;
+  t_dbh *db;
   char filename[FNLEN+1];
 } t_dbch;
 
-typedef struct s_envh {
-  DB_ENV *env;
-} t_envh;
+typedef struct s_txnh {
+  VALUE self;
+  DB_TXN *txn;
+  t_envh *env;
+} t_txnh;
 
 #define ci(b,m)				\
   rb_define_const(b,#m,INT2FIX(m))
@@ -51,4 +64,17 @@ VALUE db_ ## fname ## _eq(VALUE obj, VALUE v) \
   return obj; \
 } 
 
+#define attr_writer(fname) \
+  VALUE fname ## _writer(VALUE obj, VALUE v) \
+  {					     \
+    rb_ivar_set(obj,fv_ ## fname,v);	     \
+    return obj;				     \
+  }
+
+#define attr_reader(fname) \
+  VALUE fname ## _reader(VALUE obj) \
+  {				    \
+    return rb_ivar_get(obj,fv_ ## fname);  \
+  }
+
 #endif