DBA Tips Archive for Oracle
SELECTing a value from a table into a Unix variable
by Jeff Hunter, Sr. Database Administrator
You can select a value from a database column directly into a Unix shell variable.
Look at the following shell script examples:
Second example, using the SQL*Plus EXIT status code:#!/bin/ksh VALUE=`sqlplus -silent "/ as sysdba" <<END set pagesize 0 feedback off verify off heading off echo off select max(sequence#) from v\\\$log_history; exit; END` if [ -z "$VALUE" ]; then echo "No rows returned from database" exit 0 else echo "Max Sequence Number: $VALUE" fi
Max Sequence Number: 49
Yet another example, only this time we will read multiple values from SQL*Plus into shell variables.#!/bin/ksh sqlplus -s > junk1 "/ as sysdba" <<EOF column num_tables new_value num_tables format 9999 select count(*) num_tables from dba_tables; exit num_tables EOF echo "Number of tables: $?"
Number of tables: 97
#!/bin/ksh sqlplus -s "/ as sysdba" |& # Open a pipe to SQL*Plus print -p -- 'set feedback off linesize 500 echo off' print -p -- 'set pause off pagesize 0 verify off' print -p -- 'set heading off term off timing off' print -p -- "set sqlprompt ''" print -p -- "select sysdate from dual;" read -p SYSDATE print -p -- "select user from dual;" read -p USER print -p -- "select global_name from global_name;" read -p GLOBAL_NAME print -p -- 'select value from v$parameter where name = '\''dispatchers'\'';' read -p dispatchers print -p -- exit echo "SYSDATE : $SYSDATE" echo "USER : $USER" echo "GLOBAL_NAME : $GLOBAL_NAME" echo "dispatchers : $dispatchers"
SYSDATE : 24-SEP-04 USER : SYS GLOBAL_NAME : ORCL dispatchers : (PROTOCOL=TCP) (SERVICE=orclXDB)
Copyright (c) 1998-2018 Jeffrey M. Hunter. All rights reserved.
All articles, scripts and material located at the Internet address of http://www.idevelopment.info is the copyright of Jeffrey M. Hunter and is protected under copyright laws of the United States. This document may not be hosted on any other site without my express, prior, written permission. Application to host any of the material elsewhere can be made by contacting me at email@example.com.
I have made every effort and taken great care in making sure that the material included on my web site is technically accurate, but I disclaim any and all responsibility for any loss, damage or destruction of data or any other property which may arise from relying on it. I will in no case be liable for any monetary damages arising from such loss, damage or destruction.