locktable.out

derby database source code.good for you.

ij> -- multiuser lock table tests
disconnect;
ij> connect 'jdbc:derby:wombat;user=U1' AS C1;
ij> autocommit off;
ij> connect 'jdbc:derby:wombat;user=U2' AS C2;
ij(C2)> autocommit off;
ij(C2)> set connection C1;
ij(C1)> -- create a table and populate it
create table t1 (c1 int);
0 rows inserted/updated/deleted
ij(C1)> insert into t1 values 1;
1 row inserted/updated/deleted
ij(C1)> commit;
ij(C1)> -- test TX vs TX locks
lock table u1.t1 in exclusive mode;
0 rows inserted/updated/deleted
ij(C1)> set connection C2;
ij(C2)> lock table u1.t1 in exclusive mode;
ERROR X0X02: Table 'U1.T1' cannot be locked in 'EXCLUSIVE' mode.
ERROR 40XL1: A lock could not be obtained within the time requested
ij(C2)> set connection C1;
ij(C1)> -- verify that we still have the lock
run resource 'LockTableQuery.subsql';
ij(C1)> select 
    cast(username as char(8)) as username,
    cast(t.type as char(8)) as trantype,
    cast(l.type as char(8)) as type,
    cast(lockcount as char(3)) as cnt,
    mode,
    cast(tablename as char(12)) as tabname,
    cast(lockname as char(10)) as lockname,
    state,
    status
from 
    new org.apache.derby.diag.LockTable() l right outer join new org.apache.derby.diag.TransactionTable() t
on l.xid = t.xid where l.tableType <> 'S' 
order by 
    tabname, type desc, mode, cnt, lockname;
USERNAME|TRANTYPE|TYPE    |CNT |MODE|TABNAME     |LOCKNAME  |STATE|STATUS  
---------------------------------------------------------------------------
U1      |UserTran|TABLE   |1   |X   |T1          |Tablelock |GRANT|ACTIVE  
ij(C1)> -- verify that we can insert into the table
insert into t1 values 2;
1 row inserted/updated/deleted
ij(C1)> select * from t1;
C1         
-----------
1          
2          
ij(C1)> commit;
ij(C1)> -- test TX vs TS locks
lock table t1 in exclusive mode;
0 rows inserted/updated/deleted
ij(C1)> set connection C2;
ij(C2)> lock table u1.t1 in share mode;
ERROR X0X02: Table 'U1.T1' cannot be locked in 'SHARE' mode.
ERROR 40XL1: A lock could not be obtained within the time requested
ij(C2)> set connection C1;
ij(C1)> -- verify that we still have the lock
run resource 'LockTableQuery.subsql';
ij(C1)> select 
    cast(username as char(8)) as username,
    cast(t.type as char(8)) as trantype,
    cast(l.type as char(8)) as type,
    cast(lockcount as char(3)) as cnt,
    mode,
    cast(tablename as char(12)) as tabname,
    cast(lockname as char(10)) as lockname,
    state,
    status
from 
    new org.apache.derby.diag.LockTable() l right outer join new org.apache.derby.diag.TransactionTable() t
on l.xid = t.xid where l.tableType <> 'S' 
order by 
    tabname, type desc, mode, cnt, lockname;
USERNAME|TRANTYPE|TYPE    |CNT |MODE|TABNAME     |LOCKNAME  |STATE|STATUS  
---------------------------------------------------------------------------
U1      |UserTran|TABLE   |1   |X   |T1          |Tablelock |GRANT|ACTIVE  
ij(C1)> -- verify that we can insert into the table
insert into t1 values 3;
1 row inserted/updated/deleted
ij(C1)> select * from t1;
C1         
-----------
1          
2          
3          
ij(C1)> commit;
ij(C1)> -- test TS vs TX locks
lock table t1 in share mode;
0 rows inserted/updated/deleted
ij(C1)> set connection C2;
ij(C2)> lock table u1.t1 in exclusive mode;
ERROR X0X02: Table 'U1.T1' cannot be locked in 'EXCLUSIVE' mode.
ERROR 40XL1: A lock could not be obtained within the time requested
ij(C2)> set connection C1;
ij(C1)> -- verify that we still have the lock
run resource 'LockTableQuery.subsql';
ij(C1)> select 
    cast(username as char(8)) as username,
    cast(t.type as char(8)) as trantype,
    cast(l.type as char(8)) as type,
    cast(lockcount as char(3)) as cnt,
    mode,
    cast(tablename as char(12)) as tabname,
    cast(lockname as char(10)) as lockname,
    state,
    status
from 
    new org.apache.derby.diag.LockTable() l right outer join new org.apache.derby.diag.TransactionTable() t
on l.xid = t.xid where l.tableType <> 'S' 
order by 
    tabname, type desc, mode, cnt, lockname;
USERNAME|TRANTYPE|TYPE    |CNT |MODE|TABNAME     |LOCKNAME  |STATE|STATUS  
---------------------------------------------------------------------------
U1      |UserTran|TABLE   |1   |S   |T1          |Tablelock |GRANT|ACTIVE  
ij(C1)> -- verify that we can insert into the table
insert into t1 values 4;
1 row inserted/updated/deleted
ij(C1)> select * from t1;
C1         
-----------
1          
2          
3          
4          
ij(C1)> commit;
ij(C1)> -- test TS vs TS locks
lock table t1 in share mode;
0 rows inserted/updated/deleted
ij(C1)> set connection C2;
ij(C2)> lock table u1.t1 in share mode;
0 rows inserted/updated/deleted
ij(C2)> set connection C1;
ij(C1)> -- verify that we still have the lock
run resource 'LockTableQuery.subsql';
ij(C1)> select 
    cast(username as char(8)) as username,
    cast(t.type as char(8)) as trantype,
    cast(l.type as char(8)) as type,
    cast(lockcount as char(3)) as cnt,
    mode,
    cast(tablename as char(12)) as tabname,
    cast(lockname as char(10)) as lockname,
    state,
    status
from 
    new org.apache.derby.diag.LockTable() l right outer join new org.apache.derby.diag.TransactionTable() t
on l.xid = t.xid where l.tableType <> 'S' 
order by 
    tabname, type desc, mode, cnt, lockname;
USERNAME|TRANTYPE|TYPE    |CNT |MODE|TABNAME     |LOCKNAME  |STATE|STATUS  
---------------------------------------------------------------------------
U2      |UserTran|TABLE   |1   |S   |T1          |Tablelock |GRANT|ACTIVE  
U1      |UserTran|TABLE   |1   |S   |T1          |Tablelock |GRANT|ACTIVE  
ij(C1)> -- verify that we cannot insert into the table
insert into t1 values 5;
ERROR 40XL1: A lock could not be obtained within the time requested
ij(C1)> select * from t1;
C1         
-----------
1          
2          
3          
4          
ij(C1)> commit;
ij(C1)> set connection C2;
ij(C2)> commit;
ij(C2)> set connection C1;
ij(C1)> -- create another table
create table t2(c1 int);
0 rows inserted/updated/deleted
ij(C1)> commit;
ij(C1)> -- verify that user getting error on lock table doesn't get rolled back
lock table t1 in share mode;
0 rows inserted/updated/deleted
ij(C1)> set connection C2;
ij(C2)> lock table u1.t2 in share mode;
0 rows inserted/updated/deleted
ij(C2)> lock table u1.t1 in exclusive mode;
ERROR X0X02: Table 'U1.T1' cannot be locked in 'EXCLUSIVE' mode.
ERROR 40XL1: A lock could not be obtained within the time requested
ij(C2)> set connection C1;
ij(C1)> -- verify that other user still has the lock
run resource 'LockTableQuery.subsql';
ij(C1)> select 
    cast(username as char(8)) as username,
    cast(t.type as char(8)) as trantype,
    cast(l.type as char(8)) as type,
    cast(lockcount as char(3)) as cnt,
    mode,
    cast(tablename as char(12)) as tabname,
    cast(lockname as char(10)) as lockname,
    state,
    status
from 
    new org.apache.derby.diag.LockTable() l right outer join new org.apache.derby.diag.TransactionTable() t
on l.xid = t.xid where l.tableType <> 'S' 
order by 
    tabname, type desc, mode, cnt, lockname;
USERNAME|TRANTYPE|TYPE    |CNT |MODE|TABNAME     |LOCKNAME  |STATE|STATUS  
---------------------------------------------------------------------------
U1      |UserTran|TABLE   |1   |S   |T1          |Tablelock |GRANT|ACTIVE  
U2      |UserTran|TABLE   |1   |S   |T2          |Tablelock |GRANT|ACTIVE  
ij(C1)> commit;
ij(C1)> disconnect;
ij> set connection C2;
ij> disconnect;
ij>