OraCmd - Oracle access without client tool »
Unload CLOB data
OraCmd can unload CLOB data.
A Short Example
This section contains a short example showing how OraCmd unload CLOB data.
The Table
We used the following SQL statement to create the table:
create table T_CLOB ( ID NUMBER not null, F_CLOB CLOB, constraint PK_T_CLOB primary key (ID) )
We need export the CLOB data in F_CLOB field.
OraCmd commmand
unload header=y exportclob=y table=t_clob datafile="E:\temp\t_clob.txt";
Or a batch file(replace the userid with your own database user info. The lines wrap in this page, but in the file is 1 line.):
"C:\Program files\OraCmd\OraCmd" userid=hr/hr@localhost:1521:xe task=unload header=y exportclob=y table=t_clob datafile="E:\temp\t_clob.txt" log="E:\temp\unload_clob.log" quit=y
The OraCmd parameter descriptions are as follows:
delimiter: delimiter char ("|",",","#","TAB","WHITESPACE")
quote: quote char (quote="'" => single quotes, quote="chr(34)" => double quotes)
recorddelimiter: record delimiter, default is CRLF
header: y|n, print field name at first line
exportclob: y|n, export clob data to file
table: table name ("all" for unload all table)
query: sql query string (can not use multi-line sql)
sqlfile: sql script file contains the query you want to unload
schema: schema name, use this prameter to unload specific schema's data, if not set, use logon user's default schema
datafile: data file name
folder: data files folder (for unload all table)
dateformat: date format (e.g. "YYYY-MM-DD HH24:MI:SS")
timestampformat: timestamp format (e.g. ''YYYY-MM-DD-HH24.MI.SS.FF6'')
buffer: Number of rows that will be transferred across the network at the same time.
This property can have a great impact on performance.
So it is preferable to choose the optimal value of buffer for each SQL statement and software - hardware configuration experimentally.
The default value is 25.
quit = y|n (quit OraCmd after run batch file)