Details
-
Bug
-
Status: Closed (View Workflow)
-
Major
-
Resolution: Fixed
-
N/A
-
None
Description
As of now, the KB page for SELECT statement goes like this:
[INTO OUTFILE 'file_name' [CHARACTER SET charset_name] [export_options]
|
|
|
INTO DUMPFILE 'file_name' INTO var_name [, var_name] ]
|
|
|
[[FOR UPDATE | LOCK IN SHARE MODE] [WAIT n | NOWAIT] ] [SKIP LOCKED] ]
|
|
Off-topic: INTO DUMPFILE has lost a square bracket and is shown as mandatory, it's obviously wrong.
Thus, the locking part
[[FOR UPDATE | LOCK IN SHARE MODE] [WAIT n | NOWAIT] ] [SKIP LOCKED] ]
|
expands into these combinations, if I got them right:
<nothing>
|
FOR UPDATE
|
LOCK IN SHARE MODE
|
WAIT n
|
NOWAIT
|
FOR UPDATE WAIT n
|
FOR UPDATE NOWAIT
|
LOCK IN SHARE MODE WAIT n
|
LOCK IN SHARE MODE NOWAIT
|
SKIP LOCKED
|
FOR UPDATE SKIP LOCKED
|
LOCK IN SHARE MODE SKIP LOCKED
|
WAIT n SKIP LOCKED
|
NOWAIT SKIP LOCKED
|
FOR UPDATE WAIT n SKIP LOCKED
|
FOR UPDATE NOWAIT SKIP LOCKED
|
LOCK IN SHARE MODE WAIT n SKIP LOCKED
|
LOCK IN SHARE MODE NOWAIT SKIP LOCKED
|
But this is not true. These ones don't work:
|
10.6 88af187db9 |
MariaDB [test]> SELECT * FROM t1 WAIT 1; |
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '1' at line 1 |
MariaDB [test]> SELECT * FROM t1 SKIP LOCKED; |
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'LOCKED' at line 1 |
MariaDB [test]> SELECT * FROM t1 WAIT 1 SKIP LOCKED; |
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '1 SKIP LOCKED' at line 1 |
MariaDB [test]> SELECT * FROM t1 NOWAIT SKIP LOCKED; |
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'SKIP LOCKED' at line 1 |
The first one can actually be a bug, it is strange that this works:
MariaDB [test]> SELECT * FROM t1 NOWAIT; |
Empty set (0.000 sec) |
But this doesn't:
MariaDB [test]> SELECT * FROM t1 WAIT 1; |
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '1' at line 1 |
The ones with SKIP LOCKED are most likely rejected by design, so it just needs to be documented more precisely.