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h2database
Commits
c1692aa6
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c1692aa6
authored
2月 21, 2012
作者:
Thomas Mueller
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电子邮件补丁
差异文件
Issue 362: support LIMIT in UPDATE statements.
上级
177e081e
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
145 行增加
和
1 行删除
+145
-1
help.csv
h2/src/docsrc/help/help.csv
+1
-1
Parser.java
h2/src/main/org/h2/command/Parser.java
+4
-0
Update.java
h2/src/main/org/h2/command/dml/Update.java
+19
-0
TestLimitUpdates.java
h2/src/test/org/h2/test/jdbc/TestLimitUpdates.java
+121
-0
没有找到文件。
h2/src/docsrc/help/help.csv
浏览文件 @
c1692aa6
...
...
@@ -59,7 +59,7 @@ INSERT INTO TEST VALUES(1, 'Hello')
"Commands (DML)","UPDATE","
UPDATE tableName [ [ AS ] newTableAlias ]
SET { columnName = { DEFAULT | expression } } [,...]
[ WHERE expression ]
[ WHERE expression ]
[ LIMIT expression ]
","
Updates data in a table.
","
...
...
h2/src/main/org/h2/command/Parser.java
浏览文件 @
c1692aa6
...
...
@@ -701,6 +701,10 @@ public class Parser {
Expression
condition
=
readExpression
();
command
.
setCondition
(
condition
);
}
if
(
readIf
(
"LIMIT"
))
{
Expression
limit
=
readTerm
().
optimize
(
session
);
command
.
setLimit
(
limit
);
}
setSQL
(
command
,
"UPDATE"
,
start
);
return
command
;
}
...
...
h2/src/main/org/h2/command/dml/Update.java
浏览文件 @
c1692aa6
...
...
@@ -29,6 +29,7 @@ import org.h2.util.New;
import
org.h2.util.StatementBuilder
;
import
org.h2.util.StringUtils
;
import
org.h2.value.Value
;
import
org.h2.value.ValueNull
;
/**
* This class represents the statement
...
...
@@ -38,6 +39,10 @@ public class Update extends Prepared {
private
Expression
condition
;
private
TableFilter
tableFilter
;
/** The limit expression as specified in the LIMIT clause. */
private
Expression
limitExpr
;
private
ArrayList
<
Column
>
columns
=
New
.
arrayList
();
private
HashMap
<
Column
,
Expression
>
expressionMap
=
New
.
hashMap
();
...
...
@@ -86,8 +91,18 @@ public class Update extends Prepared {
setCurrentRowNumber
(
0
);
int
count
=
0
;
Column
[]
columns
=
table
.
getColumns
();
int
limitRows
=
-
1
;
if
(
limitExpr
!=
null
)
{
Value
v
=
limitExpr
.
getValue
(
session
);
if
(
v
!=
ValueNull
.
INSTANCE
)
{
limitRows
=
v
.
getInt
();
}
}
while
(
tableFilter
.
next
())
{
setCurrentRowNumber
(
count
+
1
);
if
(
limitRows
>=
0
&&
count
>=
limitRows
)
{
break
;
}
if
(
condition
==
null
||
Boolean
.
TRUE
.
equals
(
condition
.
getBooleanValue
(
session
)))
{
Row
oldRow
=
tableFilter
.
get
();
Row
newRow
=
table
.
getTemplateRow
();
...
...
@@ -185,6 +200,10 @@ public class Update extends Prepared {
return
CommandInterface
.
UPDATE
;
}
public
void
setLimit
(
Expression
limit
)
{
this
.
limitExpr
=
limit
;
}
public
boolean
isCacheable
()
{
return
true
;
}
...
...
h2/src/test/org/h2/test/jdbc/TestLimitUpdates.java
0 → 100644
浏览文件 @
c1692aa6
/*
* Copyright 2004-2011 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package
org
.
h2
.
test
.
jdbc
;
import
java.sql.Connection
;
import
java.sql.PreparedStatement
;
import
java.sql.ResultSet
;
import
java.sql.SQLException
;
import
org.h2.test.TestBase
;
/**
* Test for limit updates.
*/
public
class
TestLimitUpdates
extends
TestBase
{
private
static
final
String
DATABASE_NAME
=
"limitUpdates"
;
/**
* Run just this test.
*
* @param a ignored
*/
public
static
void
main
(
String
...
a
)
throws
Exception
{
TestBase
.
createCaller
().
init
().
test
();
}
public
void
test
()
throws
SQLException
{
testLimitUpdates
();
deleteDb
(
DATABASE_NAME
);
}
private
void
testLimitUpdates
()
throws
SQLException
{
deleteDb
(
DATABASE_NAME
);
Connection
conn
=
null
;
PreparedStatement
prep
=
null
;
try
{
conn
=
getConnection
(
DATABASE_NAME
);
prep
=
conn
.
prepareStatement
(
"CREATE TABLE TEST(KEY_ID INT PRIMARY KEY, VALUE_ID INT)"
);
prep
.
executeUpdate
();
prep
.
close
();
prep
=
conn
.
prepareStatement
(
"INSERT INTO TEST VALUES(?, ?)"
);
int
numRows
=
10
;
for
(
int
i
=
0
;
i
<
numRows
;
++
i
)
{
prep
.
setInt
(
1
,
i
);
prep
.
setInt
(
2
,
0
);
prep
.
execute
();
}
assertEquals
(
numRows
,
countWhere
(
conn
,
0
));
// update all elements than available
prep
.
close
();
prep
=
conn
.
prepareStatement
(
"UPDATE TEST SET VALUE_ID = ?"
);
prep
.
setInt
(
1
,
1
);
prep
.
execute
();
assertEquals
(
numRows
,
countWhere
(
conn
,
1
));
// update less elements than available
updateLimit
(
conn
,
2
,
numRows
/
2
);
assertEquals
(
numRows
/
2
,
countWhere
(
conn
,
2
));
// update more elements than available
updateLimit
(
conn
,
3
,
numRows
*
2
);
assertEquals
(
numRows
,
countWhere
(
conn
,
3
));
// update no elements
updateLimit
(
conn
,
4
,
0
);
assertEquals
(
0
,
countWhere
(
conn
,
4
));
}
finally
{
if
(
prep
!=
null
)
{
prep
.
close
();
}
if
(
conn
!=
null
)
{
conn
.
close
();
}
}
}
private
static
int
countWhere
(
final
Connection
conn
,
final
int
where
)
throws
SQLException
{
PreparedStatement
prep
=
null
;
ResultSet
rs
=
null
;
try
{
prep
=
conn
.
prepareStatement
(
"SELECT COUNT(*) FROM TEST WHERE VALUE_ID = ?"
);
prep
.
setInt
(
1
,
where
);
rs
=
prep
.
executeQuery
();
rs
.
next
();
return
rs
.
getInt
(
1
);
}
finally
{
if
(
rs
!=
null
)
{
rs
.
close
();
}
if
(
prep
!=
null
)
{
prep
.
close
();
}
}
}
private
static
void
updateLimit
(
final
Connection
conn
,
final
int
value
,
final
int
limit
)
throws
SQLException
{
PreparedStatement
prep
=
null
;
try
{
prep
=
conn
.
prepareStatement
(
"UPDATE TEST SET VALUE_ID = ? LIMIT ?"
);
prep
.
setInt
(
1
,
value
);
prep
.
setInt
(
2
,
limit
);
prep
.
execute
();
}
finally
{
if
(
prep
!=
null
)
{
prep
.
close
();
}
}
}
}
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