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Top Forums Shell Programming and Scripting Multiple co-processor file descriptors Post 64802 by tmarikle on Wednesday 2nd of March 2005 12:06:42 PM
Old 03-02-2005
Thanks for the suggestion with regards to using a global variable. I am not opposed to doing this. I hope that it doesn't get lost on the poor DBAs here who will have to maintain these scripts when I eventually have to move on.

I started working on a proof of concept and hit an unexpected snag using eval. My thought is that I would pass a handle (just a string really) to my database functions and build variables based on the handle. When I try to redirect stdout and stdin to some open file descriptors, I get an error.

Code:
#!/usr/bin/ksh

sqlplus -s /nolog |&

x=TESTVAR

eval export ${x}_stdout=3
eval export ${x}_stdin=4

eval print $TESTVAR_stdout
eval print $TESTVAR_stdin

eval exec ${TESTVAR_stdout}>&p
eval exec ${TESTVAR_stdin}<&p

eval print -u $TESTVAR_stdout "PROMPT Hello"
eval read -u $TESTVAR_stdin LINE

print $LINE

eval exec ${TESTVAR_stdout}>&p <==== results in "t[13]: 3: not found"

The previous lines work fine, I am scratching my head on why TESTVAR_stdout isn't expanding properly.

What is more perplexing is If I manually execute the lines with numeric literals, it works. If I manually execute the lines using variable and no "eval", KSH indicates that I have running jobs for stdout and closes my session for stdin.

If I can get past this hurdle, I can implement the concept easily.

Thomas
 

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OCI_SET_EDITION(3)														OCI_SET_EDITION(3)

oci_set_edition - Sets the database edition

SYNOPSIS
bool oci_set_edition (string $edition) DESCRIPTION
Sets the database "edition" of objects to be used by a subsequent connections. Oracle Editions allow concurrent versions of applications to run using the same schema and object names. This is useful for upgrading live systems. Call oci_set_edition(3) before calling oci_connect(3), oci_pconnect(3) or oci_new_connect(3). If an edition is set that is not valid in the database, connection will fail even if oci_set_edition(3) returns success. When using persistent connections, if a connection with the requested edition setting already exists, it is reused. Otherwise, a different persistent connection is created PARAMETERS
o $edition - Oracle Database edition name previously created with the SQL " CREATE EDITION" command. NOTES
Note Oracle version requirement This function is available from Oracle 11 gR2 onwards. Caution Persistent connections To avoid inconsistencies and unexpected errors, do not use ALTER SESSION SET EDITION to change the edition on persistent connec- tions. Caution DRCP Connection Pooling To avoid inconsistencies and unexpected errors when using editions and DRCP with Oracle 11.2.0.1, keep a one-to-one correspondence between the oci8.connection_class and the edition name used by applications. Each pooled server of a given connection class should only be used with one edition. This restriction has been removed with Oracle 11.2.0.2. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Two scripts can use different versions of myfunc() at the same time <?php // File 1 echo "Version 1 of application "; oci_set_edition('ORA$BASE'); $c = oci_connect('hr', 'welcome', 'localhost/XE'); $s = oci_parse($c, "begin :r := myfunc(); end;"); oci_bind_by_name($s, ":r", $r, 20); oci_execute($s); echo "The result is $r "; ?> <?php // File 2 echo "Version 2 of application "; oci_set_edition('E1'); $c = oci_connect('hr', 'welcome', 'localhost/XE'); $s = oci_parse($c, "begin :r := myfunc(); end;"); oci_bind_by_name($s, ":r", $r, 20); oci_execute($s); echo "The result is $r "; ?> PHP Documentation Group OCI_SET_EDITION(3)
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