my$ins_go_sth=$self->xref->dbc->prepare("insert ignore into go_xref (object_xref_id, linkage_type, source_xref_id) values(?,?,?)");
my$dep_sth=$self->xref->dbc->prepare("select dependent_xref_id, linkage_annotation from dependent_xref where master_xref_id = ?");
my$ins_go_sth=$self->xref->dbc->prepare("insert ignore into go_xref (object_xref_id, linkage_type, source_xref_id) values(?,?,?)");
my$dep_sth=$self->xref->dbc->prepare("select dependent_xref_id, linkage_annotation from dependent_xref where master_xref_id = ?");
my$start_sth=$self->xref->dbc->prepare("update mapping_jobs set object_xref_start = ? where job_id = ? and array_number = ?");
my$end_sth=$self->xref->dbc->prepare("update mapping_jobs set object_xref_end = ? where job_id = ? and array_number = ?");
my$update_dependent_xref_sth=$self->xref->dbc->prepare("update dependent_xref set object_xref_id = ? where master_xref_id = ? and dependent_xref_id =?");
my$object_xref_id;
my$sth=$self->xref->dbc->prepare("select max(object_xref_id) from object_xref");