1connect  con1,localhost,root,,;
2connect  con2,localhost,root,,;
3connection con1;
4disconnect con1;
5connection con2;
6DROP TABLE IF EXISTS t1;
7CREATE TABLE t1 (n INT);
8INSERT INTO t1 VALUES (1),(2),(3);
9SELECT * FROM t1;
10n
111
122
133
14DROP TABLE t1;
15connection default;
16disconnect con2;
17connection default;
18SELECT GET_LOCK("dangling", 0);
19GET_LOCK("dangling", 0)
201
21connect con1, localhost, root,,;
22connection con1;
23SELECT GET_LOCK('dangling', 3600);;
24connection default;
25disconnect con1;
26connect con1, localhost, root,,;
27SELECT GET_LOCK('dangling', 3600);;
28connection default;
29SELECT RELEASE_LOCK('dangling');
30RELEASE_LOCK('dangling')
311
32connection con1;
33GET_LOCK('dangling', 3600)
341
35connection default;
36disconnect con1;
37