之前一直無法搞清楚exp/expdp中關于query參數的正確寫法，每次都是零散的印象，這次特意把這個記錄成日志以方便以后查看。關于query參數的寫法請參看以下兩個例子：
???1.使用命令行：
???expdp t1/t1 directory=tl dumpfile=t2.dmp tables=t query="'where name=''a1'''"
Export: Release 10.2.0.4.0 - 64bit Production on Thursday, 23 February, 2012 16:27:41
Copyright (c) 2003, 2007,?Oracle.? All rights reserved.
Connected to: Oracle Database?10g?Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "T1"."SYS_EXPORT_TABLE_01":? t1/******** directory=tl dumpfile=t2.dmp tables=t query='where name=''a1'''
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . exported "T1"."T"??????????????????????????????????? 5.234 KB?????? 1 rows
Master?table?"T1"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for T1.SYS_EXPORT_TABLE_01 is:
? /home/oracle/tl/t2.dmp
Job "T1"."SYS_EXPORT_TABLE_01" successfully completed at 16:27:46
??? 2.使用參數文件：
cat par.txt
userid=t1/t1
file=t1.dmp
log=tl.log
tables=t
query='where name=''a1'''
[oracle@host101] ~/tl 1005>exp parfile=par.txt
Export: Release 10.2.0.4.0 - Production on Thu Feb 23 16:44:13 2012
Copyright (c) 1982, 2007, Oracle.? All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
. . exporting table????????????????????????????? T????????? 1 rows exported
Export terminated successfully without warnings.

總結：如果在命令行中使用query，那么其中的條件需要用外層"加內層'組成，如果條件中有字符串，則字符串中的'號變成''；如果是將query寫到參數文件中則只需要一層'即可，同樣字符串中的'轉換為''。

總結

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