与返回值一起使用时,行未更新 [英] row not updated when used with return values

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问题描述

我有一个SQL查询



从旧表中选择*(更新tbl set col1 = 2)



查询在命令行中运行正常,但与jdbc一起使用时,它会正确返回值,但不会更新值



这里是一段代码片段



< pre lang =java> 

ResultSet rs = st.executeQuery(sql);





i正在以正确的方式进行吗?







2)例如

i表中有4列



areaid,ROle,approverNo,用户名

1,role1,1,aaa

1,role2,1,sss

1,role1,2,fgfg

1,role1,3,tyty

1,role2,2,ghg

1,role1,4,sdss



和soo现在如果我添加值1,role1,(从tbl中选择Count(*),其中areaid = 1和role = role1),dfdf它工作正常,当我删除时会出现什么问题让我说1,role1,3,tyty我将不得不重新分配approvernum,以及当我更新角色时的查询? div class =h2_lin>解决方案

您好,

您可以尝试提交连接,以确保数据被提交到数据库。



你可以参考这个链接 http://www.tutorialspoint.com/jdbc/commit-rollback.htm [ ^ ]


好的,请详细参阅此链接: JDBC-锁使用选换更新犯规工作一排,http://stackoverflow.com/questions/4682871/jdbc-lock-a-row-using-select-for -update-doesnt-work [ ^ ]


两次不要问同一个问题。编辑你的问题。



从旧表中选择*(更新tbl set col1 = 2)



这是一种延迟语法。正如我已经告诉过你的那样,编写一个存储过程并分两步完成。或者只是尝试执行此操作:



update tbl set col1 = 2 go select from old table





这是真正的查询吗? db2接受旧表作为没有[]的表名?这两个表是不相关的吗?


i have a sql query

select * from old table (update tbl set col1= 2)

query works fine in command line but when used with jdbc it return the value correctly but does not update the values

here is a code snippet

<pre lang="java">

ResultSet rs = st.executeQuery(sql);



i am doing it the proper way?



2) e.g.
i have a 4 column in table

areaid,ROle,approverNo,username
1,role1,1,aaa
1,role2,1,sss
1,role1,2,fgfg
1,role1,3,tyty
1,role2,2,ghg
1,role1,4,sdss

and soo on now if i add a value 1,role1,(select Count(*) from tbl where areaid=1 and role=role1),dfdf it is working fine , what will be the query when i delete let say "1,role1,3,tyty" will i have to reassign approvernum ,and the query when i will update the role?

解决方案

Hello,
You can try committing the connection which will make sure that the data is being committed to the database.

You can refer this link http://www.tutorialspoint.com/jdbc/commit-rollback.htm[^]


Okay, Refer this link in detail : http://stackoverflow.com/questions/4682871/jdbc-lock-a-row-using-select-for-update-doesnt-work[^]


Don't ask the same question twice. Edit your question.

"select * from old table (update tbl set col1= 2)"

This is a retarded syntax. As I've told you already, write a stored procedure and do it in two steps. Or just try to execute this:

update tbl set col1= 2 go select * from old table


Is this the real query ? db2 accepts old table as a table name without [] ? The two tables are unrelated ?


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