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PLSQL... Script: Cursore, open, fetch

Shell scripting... Script: Cercare e visualizzare file per dimensione

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In programming the danger of exploring the small details of coding is that you get obsessed with every line of code you write, thereby greatly reducing productivity.
In general, is not worth obsessing over code.
On the other hand you should code with deliberation and intent. Steven Feurstein Oracle Magazine July /August 2004

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Shell scripting

Home >Shell scripting > Function connecting to oracle

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The following is a base example of a shell script function that I use to connect to Oracle and execute sql statements.
Certainly there are various option to connect and get db results within a shell script, but I tend to adopt this combination of print [ sql code] | sqlplus -s [...] because it works fine on different Oracle db versions (8i, 10g).
This sample function checks if the schema owns/reads the object passed, if the object is not in all_objects you get the no rows selected. The some construct can be used to get results, execute a procedure, drop an object, etc. As showed in the second part, the function may be a good trick to verify database connection, in fact if the function does not return the table DUAL (or another table) accessible from a schema, it means there was not logon into the db.
# file fun_chkobj
#tested on  HP-UX B.11.23 U ia64 
fun_chkobj() {
voutput=`print "set heading off \n select table_name from all_tables where table_name ='$obj' ;"| sqlplus -s ${vdbschema}/$vpass@${database}`
echo $voutput

# calling the function
v=$(fun_chkobj "SALES" "PSWSALES" "CUSTOMER" "MYTABLE");

# printing function  result
echo $v

# executing the function using echo, this time there is not object

# implementing the function to verify connection parameters
chkConn=$(fun_chkobj "SYSTEM" "MANAGER" "DBCUSTOMER" "DUAL");
if [ "${chkConn}" != "DUAL" ]
echo " Cannot connect to db"

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Anger is creative, depression is useless.
Dyson, Freeman J.

Anger is creative, depression is useless.
Dyson, Freeman J.

Oracle... Definizioni: Set di caratteri (Characterset)

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