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h2database
Commits
873aa03f
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873aa03f
authored
6月 21, 2018
作者:
Evgenij Ryazanov
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差异文件
Fix differences in checks for unsupported combination of lock mode with other flags
上级
f97a3dcc
隐藏空白字符变更
内嵌
并排
正在显示
4 个修改的文件
包含
28 行增加
和
19 行删除
+28
-19
advanced.html
h2/src/docsrc/html/advanced.html
+4
-2
Database.java
h2/src/main/org/h2/engine/Database.java
+7
-7
JdbcDatabaseMetaData.java
h2/src/main/org/h2/jdbc/JdbcDatabaseMetaData.java
+15
-7
TestMultiThread.java
h2/src/test/org/h2/test/db/TestMultiThread.java
+2
-3
没有找到文件。
h2/src/docsrc/html/advanced.html
浏览文件 @
873aa03f
...
...
@@ -229,7 +229,7 @@ Transaction isolation is provided for all data manipulation language (DML) state
<p>
Please note that with default MVStore storage engine table level locking is not used.
Instead, rows are locked for update, and read committed is used in all cases
(changing the isolation level has no effect)
.
except for explicitly selected read uncommitted transaction isolation level
.
</p>
<p>
This database supports the following transaction isolation levels:
...
...
@@ -247,7 +247,9 @@ This database supports the following transaction isolation levels:
To enable, execute the SQL statement
<code>
SET LOCK_MODE 1
</code><br
/>
or append
<code>
;LOCK_MODE=1
</code>
to the database URL:
<code>
jdbc:h2:~/test;LOCK_MODE=1
</code>
</li><li><b>
Read Uncommitted
</b><br
/>
This level means that transaction isolation is disabled.
<br
/>
This level means that transaction isolation is disabled.
This level is not supported by PageStore engine if multi-threaded mode is enabled.
<br
/>
To enable, execute the SQL statement
<code>
SET LOCK_MODE 0
</code><br
/>
or append
<code>
;LOCK_MODE=0
</code>
to the database URL:
<code>
jdbc:h2:~/test;LOCK_MODE=0
</code>
</li>
...
...
h2/src/main/org/h2/engine/Database.java
浏览文件 @
873aa03f
...
...
@@ -2265,12 +2265,12 @@ public class Database implements DataHandler {
switch
(
lockMode
)
{
case
Constants
.
LOCK_MODE_OFF
:
if
(
multiThreaded
&&
!
isMVStore
())
{
//
currently the combination of MVCC=FALSE, LOCK_MODE=0 and MULTI_THREADED
//
is not supported. a
lso see code in
//
Currently the combination of MV_STORE=FALSE, LOCK_MODE=0 and
//
MULTI_THREADED=TRUE is not supported. A
lso see code in
// JdbcDatabaseMetaData#supportsTransactionIsolationLevel(int)
throw
DbException
.
get
(
ErrorCode
.
UNSUPPORTED_SETTING_COMBINATION
,
"MV
CC=FALSE & LOCK_MODE=0 & MULTI_THREADED
"
);
"MV
_STORE=FALSE & LOCK_MODE=0 & MULTI_THREADED=TRUE
"
);
}
break
;
case
Constants
.
LOCK_MODE_READ_COMMITTED
:
...
...
@@ -2457,12 +2457,12 @@ public class Database implements DataHandler {
public
void
setMultiThreaded
(
boolean
multiThreaded
)
{
if
(
multiThreaded
&&
this
.
multiThreaded
!=
multiThreaded
)
{
if
(
lockMode
==
0
)
{
//
currently the combination of LOCK_MODE=0 and MULTI_THREADED
//
is not supported
if
(
lockMode
==
Constants
.
LOCK_MODE_OFF
&&
!
isMVStore
()
)
{
//
Currently the combination of MV_STORE=FALSE, LOCK_MODE=0 and
//
MULTI_THREADED=TRUE is not supported.
throw
DbException
.
get
(
ErrorCode
.
UNSUPPORTED_SETTING_COMBINATION
,
"
LOCK_MODE=0 & MULTI_THREADED
"
);
"
MV_STORE=FALSE & LOCK_MODE=0 & MULTI_THREADED=TRUE
"
);
}
}
this
.
multiThreaded
=
multiThreaded
;
...
...
h2/src/main/org/h2/jdbc/JdbcDatabaseMetaData.java
浏览文件 @
873aa03f
...
...
@@ -2316,13 +2316,21 @@ public class JdbcDatabaseMetaData extends TraceObject implements
public
boolean
supportsTransactionIsolationLevel
(
int
level
)
throws
SQLException
{
debugCodeCall
(
"supportsTransactionIsolationLevel"
);
if
(
level
==
Connection
.
TRANSACTION_READ_UNCOMMITTED
)
{
// currently the combination of LOCK_MODE=0 and MULTI_THREADED
// is not supported, also see code in Database#setLockMode(int)
PreparedStatement
prep
=
conn
.
prepareAutoCloseStatement
(
"SELECT VALUE FROM INFORMATION_SCHEMA.SETTINGS WHERE NAME=?"
);
prep
.
setString
(
1
,
"MULTI_THREADED"
);
ResultSet
rs
=
prep
.
executeQuery
();
return
!
rs
.
next
()
||
!
rs
.
getString
(
1
).
equals
(
"1"
);
// Currently the combination of MV_STORE=FALSE, LOCK_MODE=0 and
// MULTI_THREADED=TRUE is not supported. Also see code in
// Database#setLockMode(int)
try
(
PreparedStatement
prep
=
conn
.
prepareStatement
(
"SELECT VALUE FROM INFORMATION_SCHEMA.SETTINGS WHERE NAME=?"
))
{
// TODO skip MV_STORE check for H2 <= 1.4.197
prep
.
setString
(
1
,
"MV_STORE"
);
ResultSet
rs
=
prep
.
executeQuery
();
if
(
rs
.
next
()
&&
Boolean
.
parseBoolean
(
rs
.
getString
(
1
)))
{
return
true
;
}
prep
.
setString
(
1
,
"MULTI_THREADED"
);
rs
=
prep
.
executeQuery
();
return
!
rs
.
next
()
||
!
rs
.
getString
(
1
).
equals
(
"1"
);
}
}
return
true
;
}
...
...
h2/src/test/org/h2/test/db/TestMultiThread.java
浏览文件 @
873aa03f
...
...
@@ -288,13 +288,12 @@ public class TestMultiThread extends TestDb implements Runnable {
}
private
void
testLockModeWithMultiThreaded
()
throws
Exception
{
// currently the combination of LOCK_MODE=0 and MULTI_THREADED
// is not supported
deleteDb
(
"lockMode"
);
final
String
url
=
getURL
(
"lockMode;MULTI_THREADED=1"
,
true
);
try
(
Connection
conn
=
getConnection
(
url
))
{
DatabaseMetaData
meta
=
conn
.
getMetaData
();
assertFalse
(
meta
.
supportsTransactionIsolationLevel
(
// LOCK_MODE=0 with MULTI_THREADED=TRUE is supported only by MVStore
assertEquals
(
config
.
mvStore
,
meta
.
supportsTransactionIsolationLevel
(
Connection
.
TRANSACTION_READ_UNCOMMITTED
));
}
deleteDb
(
"lockMode"
);
...
...
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