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python/devsup/db.py

@@ -0,0 +1,54 @@
+try:
+    import _dbapi
+except ImportError:
+    import _nullapi as _dbapi
+from _dbapi import _Field, _Record
+
+_rec_cache = {}
+
+__all__ = [
+    'Record',
+    'Field',
+]
+
+def getRecord(name):
+    try:
+        return _rec_cache[name]
+    except KeyError:
+        rec = Record(name)
+        _rec_cache[name] = rec
+        return rec
+
+class Record(_Record):
+    def __init__(self, *args, **kws):
+        super(Record, self).__init__(*args, **kws)
+        self._fld_cache = {}
+    def field(self, name):
+        """Lookup field in this record
+        
+        fld = rec.field('HOPR')
+        """
+        try:
+            return self._fld_cache[name]
+        except KeyError:
+            fld = Field("%s.%s"%(self.name(), name))
+            self._fld_cache[name] = fld
+            return fld
+
+    def __repr__(self):
+        return 'Record("%s")'%self.name()
+
+class Field(_Field):
+    @property
+    def record(self):
+        """Fetch the record associated with this field
+        """
+        try:
+            return self._record
+        except AttributeError:
+            rec, _ = self.name()
+            self._record = getRecord(rec)
+            return self._record
+
+    def __repr__(self):
+        return 'Field("%s.%s")'%self.name()