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)
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