Writing to a File using pl/sql


 
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Old 02-21-2008
Writing to a File using pl/sql

Hi I am new to using pl/sql on a unix platform and am having trouble writing to a file from within a block. Below is an example of the code that I have. I know that I need to use UTL_FILE to accomplish this; however, I keep getting errors. Can someone please help me?

I am trying to create a csv file of tables name from a schema. However, I cannot figure out how to write the table names into a csv file after getting the user input.

Any help would be appreciated.

Thanks.




prompt Enter Table owner;
accept user_schema char prompt 's (SYSTEM), m (WMSYS), b (Both): ';



declare

user_input varchar2 (40) := '&user_schema';

type t_names is table of all_tables.TABLE_NAME%type;
all_table_names t_names;


begin

if user_input = 'w' then

user_input := '''WMSYS''';
select table_name bulk collect into all_table_names from all_tables where owner = user_input;


else
user_input := '''SYSTEM''';
select table_name bulk collect into all_table_names from all_tables where owner = user_input;


end if;



end;
/
 
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DBLINK_OPEN(3)						  PostgreSQL 9.2.7 Documentation					    DBLINK_OPEN(3)

NAME
dblink_open - opens a cursor in a remote database SYNOPSIS
dblink_open(text cursorname, text sql [, bool fail_on_error]) returns text dblink_open(text connname, text cursorname, text sql [, bool fail_on_error]) returns text DESCRIPTION
dblink_open() opens a cursor in a remote database. The cursor can subsequently be manipulated with dblink_fetch() and dblink_close(). ARGUMENTS
conname Name of the connection to use; omit this parameter to use the unnamed connection. cursorname The name to assign to this cursor. sql The SELECT statement that you wish to execute in the remote database, for example select * from pg_class. fail_on_error If true (the default when omitted) then an error thrown on the remote side of the connection causes an error to also be thrown locally. If false, the remote error is locally reported as a NOTICE, and the function's return value is set to ERROR. RETURN VALUE
Returns status, either OK or ERROR. NOTES
Since a cursor can only persist within a transaction, dblink_open starts an explicit transaction block (BEGIN) on the remote side, if the remote side was not already within a transaction. This transaction will be closed again when the matching dblink_close is executed. Note that if you use dblink_exec to change data between dblink_open and dblink_close, and then an error occurs or you use dblink_disconnect before dblink_close, your change will be lost because the transaction will be aborted. EXAMPLES
SELECT dblink_connect('dbname=postgres'); dblink_connect ---------------- OK (1 row) SELECT dblink_open('foo', 'select proname, prosrc from pg_proc'); dblink_open ------------- OK (1 row) PostgreSQL 9.2.7 2014-02-17 DBLINK_OPEN(3)