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myBatis扚w��d��Q�修改和删除(�?

fly — Mon, 13 Jul 2015 08:39:00 GMT

1、批量添加元素session.insert(String string�Q�Object o)

[plain] view plain copy

public void batchInsertStudent(){
List ls = new ArrayList();
for(int i = 5;i < 8;i++){
Student student = new Student();
student.setId(i);
student.setName("maoyuanjun" + i);
student.setSex("man" + i);
student.setTel("tel" + i);
student.setAddress("��江�? + i);
ls.add(student);
}
SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
session.insert("mybatisdemo.domain.Student.batchInsertStudent", ls);
session.commit();
session.close();
}
INSERT INTO STUDENT (id,name,sex,tel,address)
VALUES
(#{item.id},#{item.name},#{item.sex},#{item.tel},#{item.address})

2、批量修改session. insert (String string,Object o)

[plain] view plain copy

实例1�Q?nbsp;
public void batchUpdateStudent(){
List ls = new ArrayList();
for(int i = 2;i < 8;i++){
ls.add(i);
}
SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
session.insert("mybatisdemo.domain.Student.batchUpdateStudent",ls);
session.commit();
session.close();
}
UPDATE STUDENT SET name = "5566" WHERE id IN
#{item}
实例2�Q?nbsp;
public void batchUpdateStudentWithMap(){
List ls = new ArrayList();
for(int i = 2;i < 8;i++){
ls.add(i);
}
Map map = new HashMap();
map.put("idList", ls);
map.put("name", "mmao789");
SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
session.insert("mybatisdemo.domain.Student.batchUpdateStudentWithMap",map);
session.commit();
session.close();
}
UPDATE STUDENT SET name = #{name} WHERE id IN
#{item}

3、批量删除session.delete(String string,Object o)

[plain] view plain copy

public void batchDeleteStudent(){
List ls = new ArrayList();
for(int i = 4;i < 8;i++){
ls.add(i);
}
SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();
session.delete("mybatisdemo.domain.Student.batchDeleteStudent",ls);
session.commit();
session.close();
}
DELETE FROM STUDENT WHERE id IN
#{item}

转自�Q?nbsp;http://blog.csdn.net/myjlvzlp/article/details/8434376

fly 2015-07-13 16:39 发表评论

oracle 多行转一列，一列�{多行(�?

fly — Fri, 23 Jan 2015 03:46:00 GMT

摘要: 有一个表�Q�表名�ؓtab_test�Q�如下：一、多行�{一列select id, vnum, to_char(wmsys.wm_concat(vname)) c from tab_test group by id,vnum;执行上述sql后，如下�Q�二、一列�{多行with a as (select '/ABC/AA/AD/ABD/JI/CC/ALSKD/ALDKDJ' id from dual)... 阅读全文

fly 2015-01-23 11:46 发表评论

fly — Thu, 09 Oct 2014 11:05:00 GMT

假设现有一张�h员表�Q�表名：Person�Q�，若想��姓名、��n份证受��住址�q�三个字�D�完全相同的记录查找出来�Q��?/p>
   1:  SELECT p1.*   
   2:  FROM persons   p1,persons   p2   
   3:  WHERE p1.id<>p2.id   
   4:  AND p1.cardid   =   p2.cardid   
   5:  AND p1.pname   =   p2.pname   
   6:  AND p1.address   =   p2.address
可以实现该功能�?/p>

删除重复记录的SQL语句
1.用rowid�Ҏ��
2.用group by�Ҏ��
3.用distinct�Ҏ��

1。用rowid�Ҏ��
据据oracle带的rowid属性，�q�行判断�Q�是否存在重�?语句如下�Q?nbsp;
查数�?
     select * from table1 a where rowid !=(select   max(rowid)
     from table1 b where a.name1=b.name1 and a.name2=b.name2......)
删数据：
    delete   from table1 a where rowid !=(select   max(rowid)
     from table1 b where a.name1=b.name1 and a.name2=b.name2......)
2.group by�Ҏ��
查数�?
select count(num), max(name) from student --列出重复的记录数�Q��ƈ列出他的name属�?nbsp;
group by num
having count(num) >1 --按num分组后找��中num列重复，卛_��现次数大于一��?nbsp;
删数据：
delete from student
group by num
having count(num) >1
�q�样的话��把所有重复的都删除了�?/p>
3.用distinct�Ҏ�� -对于��的表比较有�?/p>
create table table_new as   select distinct *   from table1 minux
truncate table table1;
insert into table1 select * from table_new;

查询及删除重复记录的�Ҏ��大全
1、查找表中多余的重复记录�Q�重复记录是�Ҏ��单个字段�Q�peopleId�Q�来判断
select * from people
where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)
2、删除表中多余的重复记录�Q�重复记录是�Ҏ��单个字段�Q�peopleId�Q�来判断�Q�只留有rowid最��的记录
delete from people
where peopleId in (select peopleId from people group by peopleId   having count(peopleId) > 1)
and rowid not in (select min(rowid) from people group by peopleId having count(peopleId )>1)
3、查找表中多余的重复记录�Q�多个字�D�）
select * from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
4、删除表中多余的重复记录�Q�多个字�D�）�Q�只留有rowid最��的记录
delete from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)
5、查找表中多余的重复记录�Q�多个字�D�）�Q�不包含rowid最��的记录
select * from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)
(�? 比方�?在A表中存在一个字�D?#8220;name”�Q?nbsp;
而且不同记录之间�?#8220;name”值有可能会相同，
现在��是需要查询出在该表中的各记录之间�Q?#8220;name”值存在重复的��；
Select Name,Count(*) From A Group By Name Having Count(*) > 1
如果�q�查性别也相同大则如�?
Select Name,sex,Count(*) From A Group By Name,sex Having Count(*) > 1
(�? �Ҏ��一
declare @max integer,@id integer
declare cur_rows cursor local for select ��d��D?count(*) from 表名 group by ��d��D?having count(*) >�Q?1
open cur_rows
fetch cur_rows into @id,@max
while @@fetch_status=0
begin
select @max = @max -1
set rowcount @max
delete from 表名 where ��d��D?= @id
fetch cur_rows into @id,@max
end
close cur_rows
set rowcount 0
�Ҏ��?/p>
�Q�重复记录＂有两个意义上的重复记录，一是完全重复的记录�Q�也��x��有字�D�均重复的记录，二是部分关键字段重复的记录，比如Name字段重复�Q�而其他字�D�不一定重复或都重复可以忽略�?/p>
1、对于第一�U�重复，比较�Ҏ��解决�Q��?/p>
select distinct * from tableName
��可以得到无重复记录的结果集�?/p>
如果该表需要删除重复的记录�Q�重复记录保�?条）�Q�可以按以下�Ҏ��删除
select distinct * into #Tmp from tableName
drop table tableName
select * into tableName from #Tmp
drop table #Tmp
发生�q�种重复的原因是表设计不周��生的�Q�增加唯一索引列即可解冟�?/p>
2、这�c�重复问题通常要求保留重复记录中的�W�一条记录，操作�Ҏ��如下
假设有重复的字段为Name,Address�Q�要求得到这两个字段唯一的结果集
select identity(int,1,1) as autoID, * into #Tmp from tableName
select min(autoID) as autoID into #Tmp2 from #Tmp group by Name,autoID
select * from #Tmp where autoID in(select autoID from #tmp2)
最后一个select卛_��C��Name�Q�Address不重复的�l�果集（但多了一个autoID字段�Q�实际写时可以写在select子句中省��L��列）
(�? 查询重复
select * from tablename where id in (
select id from tablename
group by id
having count(id) > 1)

fly 2014-10-09 19:05 发表评论

ORA-01034: ORACLE not available

fly — Tue, 22 Jul 2014 10:43:00 GMT

解决�Ҏ��一�Q? ERROR: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist �q�程 ID: 0 会话 ID: 0 序列�? 0 因�ؓ�q�个��小的错误，折腾了我好几个小�Ӟ��特记录如下�? 上网搜烦了下解决�Ҏ��Q�如下： sqlplus "sys/password as sysdba" �q�接成功�Q�提�C?已连接到�I�闲例程" SQL> startup ORACLE 例程已经启动�? Total System Global Area 535662592 bytes Fixed Size 1375792 bytes Variable Size 293601744 bytes Database Buffers 234881024 bytes Redo Buffers 5804032 bytes 数据库装载完毕�? ORA-03113: 通信通道的文件结��? �q�程 ID: 5412 会话 ID: 5 序列�? 5 出现一个新错误�Q�ORA-03113: 通信通道的文件结��；分析可能�׃��昨晚数据库强制关闭，��D��文�g状态可能不一��_��因�ؓ正常关闭数据库会同步校验各文�Ӟ��使得重新启动的时候文件时间点一致�? 扑ֈ�解决�Ҏ��如下�Q? SQL> conn / as sysdba 已连接到�I�闲例程�? SQL> startup mount ORACLE 例程已经启动�? Total System Global Area 535662592 bytes Fixed Size 1375792 bytes Variable Size 293601744 bytes Database Buffers 234881024 bytes Redo Buffers 5804032 bytes 数据库装载完毕�? SQL> select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC ---------- ---------- ---------- ---------- ---------- ---------- --- STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME ---------------- ------------- -------------- ------------ ------------- 1 1 340 52428800 512 1 NO INACTIVE 8474486 02-4�?-11 8522856 02-4�?-11 3 1 342 52428800 512 1 NO INACTIVE 8555222 06-4�?-11 8565162 11-4�?-11 2 1 343 52428800 512 1 NO CURRENT 8565162 11-4�?-11 2.8147E+14 SQL> alter database open resetlogs 2 ; alter database open resetlogs * �W?1 行出现错�? ORA-01139: RESETLOGS 选项仅在不完全数据库恢复后有�? SQL> recover database until time '2011-04-11 12:12:12' 完成介质恢复�? SQL> alter database open resetlogs; 数据库已更改�? SQL> shutdown 数据库已�l�关闭�? 已经卸蝲数据库�? ORACLE 例程已经关闭�? SQL> startup ORACLE 例程已经启动�? Total System Global Area 535662592 bytes Fixed Size 1375792 bytes Variable Size 293601744 bytes Database Buffers 234881024 bytes Redo Buffers 5804032 bytes 数据库装载完毕�? 数据库已�l�打开�? 解决�Ҏ��Q�二我顶字号�Q�大 �? ��? 在试囄��录pl/sql�?输入用户名（system/pwd)后，Oracle报告下列错误�Q? ERROR: ORA-27101 Shared memory realm does not exist ORA-01034 ORACLE not available &<60; 查阅了相�? ORA-27101 Shared memory realm does not exist ORA-01034 ORACLE not available &<60; 的说明，解释为ORACLE_HOME或者ORACLE_SID讄��不正��? 但检查bash_profile以后没有发现错误; 錯誤點，沒有開啟oracle服務�Q? 解決辦法�Q�直接開啟oracle盔R��數據庫的服務�Q? 或按照下面的步驟操作: lsnrctl start sqlplus '/as sysdba' sql> startup emctl start dbconsole isqlplusctl start

fly 2014-07-22 18:43 发表评论

【故障处理】ORA-00119: invalid specification for system parameter LOCAL_LISTENER

fly — Tue, 22 Jul 2014 10:38:00 GMT

在windows下更换用户后数据库数据库无法启动报如下错误： ORA-00119: invalid specification for system parameter LOCAL_LISTENER ORA-00132: syntax error or unresolved network name 'LISTENER_ORCL' 问题处理�q�程�Q? 1、修改tnsnames.ora文�g�Q�添加下面的语句�Q? LISTENER_ORCL = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0)) 2、然后就可以成功启动数据库了另外�q�有一些关于监听无法监听到orcl实例�Q�后来是通过oracle静态注册的方式完成的�? -- The End --

fly 2014-07-22 18:38 发表评论

oracle数据库导入导出命�?�?

fly — Thu, 17 Jul 2014 12:51:00 GMT

oracle数据库导入导出命令！

Oracle数据导入导出imp/exp
功能�Q�Oracle数据导入导出imp/exp��q��当与oracle数据�q�原与备份�?br />
大多情况都可以用Oracle数据导入导出完成数据的备份和�q�原�Q�不会造成数据的丢失）�?br /> Oracle有个好处�Q�虽然你的电脑不是服务器�Q�但是你装了oracle客户端，�q�徏立了�q�接
�Q�通过Net Configuration Assistant��d��正确的服务命名，其实你可以想成是客户端与服务器端修了条�\�Q�然后数据就可以被拉�q�来了）
�q�样你可以把数据导出到本圎ͼ�虽然可能服务器离你很�q��?br /> 你同样可以把dmp文�g从本地导入到�q�处的数据库服务器中�?br /> 利用�q�个功能你可以构��Z��个相同的数据库，一个用来测试，一个用来正式��用�?br />
执行环境�Q�可以在SQLPLUS.EXE或者DOS�Q�命令行�Q�中执行�Q?br /> DOS中可以执行时�׃�� 在oracle 8i �?nbsp; 安装目录\$ora10g\BIN被设�|��ؓ全局路径�Q?br /> 该目录下有EXP.EXE与IMP.EXE文�g被用来执行导入导出�?br /> oracle用java�~�写�Q�我想SQLPLUS.EXE、EXP.EXE、IMP.EXE�q�俩个文件是被包装后的类文�g�?br /> SQLPLUS.EXE调用EXP.EXE、IMP.EXE他们所包裹的类�Q�完成导入导出功能�?br />
下面介绍的是导入导出的实例，向导入导出看实例基本上就可以完成�Q�因为导入导出很��单�?br />数据导出�Q?br /> 1 ��数据库TEST完全导出,用户名system 密码manager 导出到D:\daochu.dmp�?br />   exp system/manager@TEST file=d:\daochu.dmp full=y
2 ��数据库中system用户与sys用户的表导出
   exp system/manager@TEST file=d:\daochu.dmp owner=(system,sys)
3 ��数据库中的表table1 、table2导出
   exp system/manager@TEST file=d:\daochu.dmp tables=(table1,table2)
4 ��数据库中的表table1中的字段filed1�?00"打头的数据导�?br />   exp system/manager@TEST file=d:\daochu.dmp tables=(table1) query=\" where filed1 like '00%'\"

     上面是常用的导出�Q�对于压�~�我不太在意�Q�用winzip把dmp文�g可以很好的压�~��?br />                     不过在上面命令后�?加上 compress=y ��可以了

数据的导�?br /> 1 ��D:\daochu.dmp 中的数据导入 TEST数据库中�?br /> imp system/manager@TEST file=d:\daochu.dmp
上面可能有点问题�Q�因为有的表已经存在�Q�然后它��报错，对该表就不进行导入�?br /> 在后面加�?ignore=y ��可以了�?br /> 2 ��d:\daochu.dmp中的表table1 导入
imp system/manager@TEST file=d:\daochu.dmp tables=(table1)

基本上上面的导入导出够用了。不��情冉|��是将表彻底删除，然后导入�?br />
注意�Q?br /> 你要有��够的权限�Q�权限不够它会提�C�Z��?br /> 数据库时可以�q�上的。可以用tnsping TEST 来获得数据库TEST能否�q�上�?/p>

数据导出�Q?br />exp hkb/hkb@boss_14 full=y file=c:\orabackup\hkbfull.dmp log=c:\orabackup\hkbfull.log;

导出注意事项�Q�导出的是当前用��L��的数据，当前用户如果有DBA的权限，则导出所有数据！

同名用户之间的数据导入：
imp hkb/hkb@xe file=c:\orabackup\hkbfull.dmp log=c:\orabackup\hkbimp.log full=y

不同名之间的数据导入�Q?br />imp system/test@xe fromuser=hkb touser=hkb_new file=c:\orabackup\hkbfull.dmp

log=c:\orabackup\hkbimp.log;

fly 2014-07-17 20:51 发表评论

图片区亚洲欧美小说区,国产在线免费观看,美州a亚洲一视本频v色道

myBatis扚w����d���Q�修改和删除(�?

1、批量添加元素session.insert(String string�Q�Object o)

oracle 多行转一列，一列�{多行(�?

ORA-01034: ORACLE not available

【故障处理】ORA-00119: invalid specification for system parameter LOCAL_LISTENER

oracle数据库导入导出命�?�?

myBatis扚w��d��Q�修改和删除(�?