有以下ADO语句：
①setoconn=server.createobject("adodb.connection")
②oconn.Open"contacts"//"contacts"是数据源的系统DSN
③oconn.begintrans
④oconn.execute"deletefromcontactwherestate='la'”
⑤oconn.execute"deletefromnameswherestate='la'"
⑥oconn.execute"deletefromphoneswherestate='la'"
⑦ifoconn.errors.count=0then
⑧oconn.committrans
⑨else
⑩oconn.rollbacktrans
?endif
?oconn.close
?setoconn=nothing
（1）第3.8.10行分别是操作？
（2）描述所有语句完成了一个什么任务？