在这种情况下有人帮助我吗?我正在使用hibernate从db中选择数据,但是当我从sql调试日志中检查时.我总是看到在使用"select"sql从DB获取数据后打印的更新sql.
2013-08-13 13:39:08,054 DEBUG [http-0.0.0.0-8080-1-TASK]-[org.hibernate.SQL]
SELECT this_.id AS id504_2_,
this_.bridgedlinedialoguri AS bridgedL2_504_2_,
this_.bridgedlineuri AS bridgedL3_504_2_,
this_.currentsipsubscriberprofile AS currentS4_504_2_,
this_.currentsipsubscriberprofiletype AS currentS5_504_2_,
this_.messageeventuri AS messageE6_504_2_,
this_.nemobjectid AS neMobjec7_504_2_,
this_.objectid AS objectId504_2_,
this_.objecttype AS objectType504_2_,
this_.sipbridgedlineurienable AS sipBrid10_504_2_,
this_.sipdirectconnecturi AS sipDire11_504_2_,
this_.sipdirectconnecturienable AS sipDire12_504_2_,
this_.sipidentityaddress AS sipIden13_504_2_,
this_.sipidentitycontacturi AS sipIden14_504_2_,
this_.sipidentitypassword AS sipIden15_504_2_,
this_.sipidentityrealm AS sipIden16_504_2_,
this_.sipiotparametersenablestatus AS sipIotP17_504_2_,
this_.sipiotparametersprivacy AS sipIotP18_504_2_,
this_.sipiotparametersrequire100rel AS sipIotP19_504_2_,
this_.sipiotparameterssupport100rel AS sipIotP20_504_2_,
this_.sipmessageeventurienable AS sipMess21_504_2_,
this_.sippreferredid AS sipPref22_504_2_,
this_.sippreferredidmode AS sipPref23_504_2_,
this_.sipsubscribertemplateenable AS sipSubs24_504_2_,
this_.sipusername AS …Run Code Online (Sandbox Code Playgroud) 我有两个不访问任何常见记录的事务的死锁问题.也没有锁升级.所以我无法解释为什么死锁是可能的.
当两个此类事务同时执行时发生死锁:
begin transaction
update A set [value] = [value]
where id = 1; /* resp. 2 */
/* synchronize transactions here */
SELECT *
FROM
A inner join B on A.B_FK = B.id
inner join C on C.A_FK = A.id
WHERE
A.[value] = 1; /* resp. 2 */
rollback;
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这些是用于设置场景的表和数据:
CREATE TABLE A (
id INT NOT NULL,
[value] INT,
B_FK INT
primary key (id)
)
CREATE TABLE B (
id INT NOT NULL,
primary key (id)
)
CREATE …Run Code Online (Sandbox Code Playgroud) 我想要 :
我有并行进程一起完成同样的工作,我想确保所有人都能在独特的行上工作.我该如何确保?
是否可以在Oracle数据库中实现比在MS SQL Server数据库中更好的并发?特别是在OLTP场景中,例如ERP系统?
我无意中听到SAP顾问提出这种说法,指的是Oracle锁定技术,如行锁定和多版本读取一致性以及重做日志.
上述查询在 Oracle 10g 上成功运行。现在我必须使用 SQLSERVER 2005 实现相同的查询(应用程序)。
当我在 SQLSERVER 2005 中运行上述查询时,出现错误“FOR UPDATE 子句仅允许用于 DECLARE CURSOR”。
SQLSERVER 2005 支持上述查询吗?或者有什么替代方案吗?
目的:
基本上我正在更新我的应用程序中的文档。我正在使用分块更新,每次都必须将旧内容附加到新内容。
代码:
Blob bb = getDataAccess().executeScalar( "select content from Repository where id = ? for update", getId());
os = bb.setBinaryStream(startIndex + 1);
while ((read = content.read(buf)) > 0) {
os.write(buf, 0, read);
startIndex += read;
//commit every megabate or every second so upload progress is visible
//and we don't lose more than 1MB if something happens.
if (startIndex - lastStartIndex > …Run Code Online (Sandbox Code Playgroud)