oracle数据与文本导入导出源码示例

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oracle提供了sqlldr的工具,有时需要讲数据导入到文本,oracle的spool可以轻松实现。

方便的实现oracle导出数据到txt、txt导入数据到oracle。

一、导出数据到txt


用all_objects表做测试

desc all_objects; Name Null? Type ----------------------------------------- -------- ---------------------------- OWNER NOT NULL VARCHAR2(30) OBJECT_NAME NOT NULL VARCHAR2(30) SUBOBJECT_NAME VARCHAR2(30) OBJECT_ID NOT NULL NUMBER DATA_OBJECT_ID NUMBER OBJECT_TYPE VARCHAR2(19) CREATED NOT NULL DATE LAST_DDL_TIME NOT NULL DATE TIMESTAMP VARCHAR2(19) STATUS VARCHAR2(7) TEMPORARY VARCHAR2(1) GENERATED VARCHAR2(1) SECONDARY VARCHAR2(1)

拿object_id,object_name做导出、导入测试。

一些设置满足数据导出的样式:

vi exp_table.sql

sql;"> set line 1000 --设置行的长度 set pagesize 0 --输出不换页 set Feedback off --默认的当一条sql发出的时候,oracle会给一个反馈,比如说创建表的时候,如果成功命令行会返回类似:Table created的反馈,off后不显示反馈 set heading off --不显示表头信息 set trimspool on --如果trimspool设置为on,将移除spool文件中的尾部空 set trims on --去掉空字符 set echo off;     --显示start启动的脚本中的每个sql命令,缺省为on set colsep '|' --设置分隔符 set termout off --不在屏幕上显示结果 spool db1.txt --记录数据到db1.txt select object_id,object_name from all_objects; --导出数据语句 spool off --收集完毕 exit

一切就绪后导出数据:

sql;"> [oracle@centos5 ~]$ sqlplus test/test @exp_table.sql sql*Plus: Release 10.2.0.4.0 - Production on Thu Jun 13 16:35:14 2013 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 Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production With the Partitioning,Data Mining and Real Application Testing options [oracle@centos5 ~]$ sed -i 's/ //g' db1.txt --可选,去除每行开头部分的空格 [oracle@centos5 ~]$ more db1.txt 20|ICOL$ 44|I_USER1 28|CON$ 15|UNDO$ 29|C_COBJ# 3|I_OBJ# 25|PROXY_ROLE_DATA$

导出后检查数据的记录数是否正确

select count(*) from all_objects; COUNT(*) ---------- 49988 --数据正确

二、从txt导入数据到oracle

sqlldr是通过一个control文件设定后,从文本导入数据

建立一张测试表

create table tb_sqlldr (id number,name varchar2(50)); Table created.

建立一个control文件

vi tb_sqlldr.ctl

sql;"> load data infile 'db1.txt' --数据来源文本 append into table tb_sqlldr --数据导入到表tb_sqldr中,导入方式为追加,如果想覆盖 fields terminated by "|" --4、字段终止于X'09',是一个制表符(tab) (id,name) --定义对应的字段名称,注意顺序

导入数据分成四种模式,可以根据需求选择:

APPEND // 原先的表有数据 就加在后面

INSERT // 装载空表 如果原先的表有数据 sqlloader会停止 默认值

REPLACE // 原先的表有数据 原先的数据会全部删除

TRUNCATE // 指定的内容和replace的相同 会用truncate语句删除现存数据

执行导入操作

sql;"> sqlldr userid=test/test control=tb_sqlldr.ctl

差不多5w的数据短短2s解决

执行导入后验证数据

select count(*) from tb_sqlldr; COUNT(*) ---------- 49988

导入成功

再执行一次导入操作,由于设置为追加:

select count(*) from tb_sqlldr; COUNT(*) ---------- 99976

记录翻倍

sqlldr还有很多参数供选择,比如log、bad这些,查看帮助即可。

sql;"> [oracle@centos5 ~]$ sqlldr sql*Loader: Release 10.2.0.4.0 - Production on Thu Jun 13 17:07:26 2013 Copyright (c) 1982,Oracle. All rights reserved.

Usage: sqlLDR keyword=value [,keyword=value,...]
Valid Keywords:
userid -- ORACLE username/password
control -- control file name
log -- log file name
bad -- bad file name
data -- data file name
discard -- discard file name
discardmax -- number of discards to allow (Default all)
skip -- number of logical records to skip (Default 0)
load -- number of logical records to load (Default all)
errors -- number of errors to allow (Default 50)
rows -- number of rows in conventional path bind array or between direct path data saves
(Default: Conventional path 64,Direct path all)
bindsize -- size of conventional path bind array in bytes (Default 256000)
silent -- suppress messages during run (header,Feedback,errors,discards,partitions)
direct -- use direct path (Default FALSE)
parfile -- parameter file: name of file that contains parameter specifications
parallel -- do parallel load (Default FALSE)
file -- file to allocate extents from
skip_unusable_indexes -- disallow/allow unusable indexes or index partitions (Default FALSE)
skip_index_maintenance -- do not maintain indexes,mark affected indexes as unusable (Default FALSE)
commit_discontinued -- commit loaded rows when load is discontinued (Default FALSE)
readsize -- size of read buffer (Default 1048576)
external_table -- use external table for load; NOT_USED,GENERATE_ONLY,EXECUTE (Default NOT_USED)
columnarrayrows -- number of rows for direct path column array (Default 5000)
streamsize -- size of direct path stream buffer in bytes (Default 256000)
multithreading -- use multithreading in direct path
resumable -- enable or disable resumable for current session (Default FALSE)
resumable_name -- text string to help identify resumable statement
resumable_timeout -- wait time (in seconds) for RESUMABLE (Default 7200)
date_cache -- size (in entries) of date conversion cache (Default 1000)
PLEASE NOTE: Command-line parameters may be specified either by
position or by keywords. An example of the former case is 'sqlldr
scott/tiger foo'; an example of the latter is 'sqlldr control=foo
userid=scott/tiger'. One may specify parameters by position before
but not after parameters specified by keywords. For example,'sqlldr scott/tiger control=foo logfile=log' is allowed,but
'sqlldr scott/tiger control=foo log' is not,even though the
position of the parameter 'log' is correct.

总结

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