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DB2中export详解

Posted on 2009-03-25 13:40 Prayer 阅读(3586) 评论(0)  编辑 收藏 引用 所属分类: DB2
1、导出用户必须有SYSADM或DBADM授权,或者在表格上拥有CONTROL或SELECT权限;
2、不支持带结构列的表格数据导出;
3、可以导出带identity列的表格为ixf格式,导入时用REPLACE_CREATE、CREATE重建identity列,如果该列定义是GENERATED ALWAYS,导入时则必须指定identityignore选项。
4、指定导出格式为ixf,ixf文件中含有表格和索引定义,用import可以重建表格和索引,但是下面情况ixf文件会丢失相关信息:
* index column names contain hexadecimal values of 0×2B or 0×2D
* table contains XML columns
* table contains LOB(超过1G的定义) columns
* table is multidimensional clustered
* table contains a table partitioning key
* index name that is longer than 128 bytes due to codepage conversion
* table is a protected table
* contains action strings other than SELECT * FROM
* method N is specified
5、如果导出文件太大,可以使用where条件限制导出的数据量,分批导出;
6、导出文件格式:
* DEL (delimited ASCII format)
* WSF (work sheet format)
* IXF (integrated exchange format, PC version)
7、执行导出命令前,确认完成了commit或rollback;
8、导出格式为DEL时,如果字符列长度超过254时会有警告提示
9、导出包是与DATETIME ISO格式绑定的,所以在sql语句中需要使用iso格式:
查询数据库(返回3行数据)
db2 select col2 from tab1 where char(col2)=’05/10/2005’;
3 record(s) selected.
导出时使用locale格式不能选择到记录
db2 export to test.del of del select col2 from test where char(col2)=’05/10/2005’;
Number of rows exported: 0
由locale格式改为iso格式
db2 export to test.del of del select col2 from test where char(col2)=’2005-05-10’;
Number of rows exported: 3
10、导出执行的三种方式
* CLP命令:export
* ADMIN_CMD存储过程的export过程
* db2export的API接口,使用c语言实现
11、del文件格式指定参数举例:db2 “export to myfile.del of del modified by chardel’’ coldel; decpt, select * from staff”
chardelx: 指定字符串的分隔符,缺省是双引号,可以指定为单引号modified by chardel'’
coldelx:指定列分隔符,缺省是逗号,可以改为分号modified by coldel;
decplusblank:指定对正数是否用+符号,缺省带+,可以指定不加正数符号
striplzeros:指定移走数据前导的0,如:+00001.8–>+1.8
测试如下
db2 “export to tb1-1.del of del select * from tb1″
+00000002.10,”abc”
db2 “export to tb1-2.del of del modified by chardel'’ coldel; decplusblank striplzeros select * from tb1″
2.10;’abc’
timestampformat=″x″时间戳格式设置,如:”YYYY/MM/DD HH:MM:SS.UUUUUU”、”yyyy.mm.dd hh:mm tt”
YYYY - Year (four digits ranging from 0000 - 9999)
M - Month (one or two digits ranging from 1 - 12)
MM - Month (two digits ranging from 01 - 12)
D - Day (one or two digits ranging from 1 - 31)
DD - Day (two digits ranging from 1 - 31)
H - Hour (one or two digits ranging from 0 - 12 for a 12 hour system, and 0 - 24 for a 24 hour system)
HH - Hour (two digits ranging from 0 - 12 for a 12 hour system, and 0 - 24 for a 24 hour system)
M - Minute (one or two digits ranging from 0 - 59)
MM - Minute (two digits ranging from 0 - 59)
S - Second (one or two digits ranging from 0 - 59)
SS - Second (two digits ranging from 0 - 59)
UUUUUU - Microsecond (6 digits ranging from 000000 - 999999)
UUUUU - Microsecond (5 digits ranging from 00000 - 99999)
UUUU - Microsecond (4 digits ranging from 0000 - 9999)
UUU - Microsecond (3 digits ranging from 000 - 999)
UU - Microsecond (2 digits ranging from 00 - 99)
U - Microsecond (1 digit ranging from 0 - 9)
TT - Meridian indicator (AM or PM)
如果指定了TT,HH就会在0-12之间显示

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