/* Open
* open cursor, resolving schema
* for the set of opened columns
*
* NB - there is no corresponding "Close"
* use "Release" instead.
*/
rc_t VTableReadCursorOpen ( const VTableCursor *cself )
{
rc_t rc;
VTableCursor *self = ( VTableCursor* ) cself;
if ( self == NULL )
rc = RC ( rcVDB, rcCursor, rcOpening, rcSelf, rcNull );
else
{
VLinker *ld = self -> tbl -> linker;
KDlset *libs;
rc = VLinkerOpen ( ld, & libs );
if ( rc == 0 )
{
rc = VCursorOpenRead ( self, libs );
if ( rc == 0 )
{
int64_t first;
uint64_t count;
rc = VCursorIdRange ( & self -> dad, 0, & first, & count );
if ( rc != 0 )
{
/* permit empty open when run from sradb */
if ( GetRCState ( rc ) == rcEmpty && GetRCObject ( rc ) == rcRange &&
self -> permit_add_column && VectorLength ( & self -> dad . row ) == 0 )
{
rc = 0;
}
}
else if ( count != 0 )
{
/* set initial row id to starting row */
self -> dad . start_id =
self -> dad . end_id =
self -> dad . row_id = first;
}
if ( rc != 0 )
self -> dad . state = vcFailed;
}
KDlsetRelease ( libs );
}
}
return rc;
}
LIB_EXPORT rc_t CC VCursorOpen ( const VCursor *cself )
{
rc_t rc;
VCursor *self = ( VCursor* ) cself;
if ( self == NULL )
rc = RC ( rcVDB, rcCursor, rcOpening, rcSelf, rcNull );
else
{
VLinker *ld = self -> tbl -> linker;
KDlset *libs;
rc = VLinkerOpen ( ld, & libs );
if ( rc == 0 )
{
rc = VCursorOpenRead ( self, libs );
if ( rc == 0 )
{
if ( ! self -> read_only )
{
VProdResolve pr;
pr . schema = self -> schema;
pr . ld = ld;
pr . libs = libs;
pr . stbl = self -> stbl;
pr . curs = self;
pr . cache = & self -> prod;
pr . owned = & self -> owned;
pr . chain = chainEncoding;
pr . blobbing = false;
pr . ignore_column_errors = false;
pr . discover_writable_columns = false;
if ( !self -> suspend_triggers )
rc = VProdResolveAddTriggers ( & pr, self -> stbl );
}
if ( rc == 0 )
{
/* TBD - warn if any input columns are unreferenced by schema */
int64_t first;
uint64_t count;
rc = VCursorIdRange ( self, 0, & first, & count );
if ( rc != 0 )
{
if ( GetRCState ( rc ) == rcEmpty )
{
/* writable cursors are expected to be empty */
if ( ! self -> read_only ||
/* permit empty open when run from sradb */
( GetRCObject ( rc ) == rcRange &&
self -> permit_add_column &&
VectorLength ( & self -> row ) == 0 ) )
{
rc = 0;
}
}
}
else if ( count != 0 )
{
if ( self -> read_only )
{
/* set initial row id to starting row */
self -> start_id = self -> end_id = self -> row_id = first;
}
else
{
/* set initial row id to append */
self -> start_id = self -> end_id = self -> row_id = first + count;
}
}
}
if ( rc != 0 )
self -> state = vcFailed;
}
KDlsetRelease ( libs );
}
}
return rc;
}
