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bsddb3 4.2.2, adds DBCursor.get_current_size() method to return the length

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of the current value without reading the value itself.
This commit is contained in:
Gregory P. Smith 2003-10-01 06:48:51 +00:00
parent efb3a161c3
commit be0db8b125
2 changed files with 72 additions and 38 deletions
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36
Modules/_bsddb.c
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@ -93,7 +93,7 @@
/* 40 = 4.0, 33 = 3.3; this will break if the second number is > 9 */
#define DBVER (DB_VERSION_MAJOR * 10 + DB_VERSION_MINOR)
#define PY_BSDDB_VERSION "4.2.1"
#define PY_BSDDB_VERSION "4.2.2"
static char *rcs_id = "$Id$";
@ -2981,6 +2981,39 @@ DBC_get_both(DBCursorObject* self, PyObject* args)
self->mydb->moduleFlags.getReturnsNone);
}
/* Return size of entry */
static PyObject*
DBC_get_current_size(DBCursorObject* self, PyObject* args)
{
int err, flags=DB_CURRENT;
PyObject* retval = NULL;
DBT key, data;
if (!PyArg_ParseTuple(args, ":get_current_size"))
return NULL;
CHECK_CURSOR_NOT_CLOSED(self);
CLEAR_DBT(key);
CLEAR_DBT(data);
/* We don't allocate any memory, forcing a ENOMEM error and thus
getting the record size. */
data.flags = DB_DBT_USERMEM;
data.ulen = 0;
MYDB_BEGIN_ALLOW_THREADS;
err = self->dbc->c_get(self->dbc, &key, &data, flags);
MYDB_END_ALLOW_THREADS;
if (err == ENOMEM || !err) {
/* ENOMEM means positive size, !err means zero length value */
retval = PyInt_FromLong((long)data.size);
err = 0;
}
FREE_DBT(key);
FREE_DBT(data);
RETURN_IF_ERR();
return retval;
}
static PyObject*
DBC_set_both(DBCursorObject* self, PyObject* args)
{
@ -4079,6 +4112,7 @@ static PyMethodDef DBCursor_methods[] = {
{"set", (PyCFunction)DBC_set, METH_VARARGS|METH_KEYWORDS},
{"set_range", (PyCFunction)DBC_set_range, METH_VARARGS|METH_KEYWORDS},
{"get_both", (PyCFunction)DBC_get_both, METH_VARARGS},
{"get_current_size",(PyCFunction)DBC_get_current_size, METH_VARARGS},
{"set_both", (PyCFunction)DBC_set_both, METH_VARARGS},
{"set_recno", (PyCFunction)DBC_set_recno, METH_VARARGS|METH_KEYWORDS},
{"consume", (PyCFunction)DBC_consume, METH_VARARGS|METH_KEYWORDS},