Function call from SQL SELECT

I am calling a function from a SELECT statement. I want to call this function 3 times in the same select statement, to get 3 different levels in a hierarchy for a particular licence number. This function has a hierarchy query using a START WITH.. CONNECT BY clause and a SYS_CONNECT_BY_PATH function to get the full hierarchy path in the SELECT clause. Then the SUBSTR/INSTR functions are used to get the 1st, 2nd or 3rd element in the hierarchy.
The query is now running very slowly. Is there a better way of doing this -- should I just use in-line views in the SQL statement. Am I trying to do something stupid!!?

a) you are calling the PL/SQL engine from the SQL engine 3 times for every row of data you are processing. This WILL have a performance impact.
b) If you can do something purely in SQL then do it that way as this will be the most peformant.
If you post an example of your data (provide us with CREATE TABLE/INSERTs or WITH statement) and an example of what you are trying to get as output then we may be able to help.

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    Let's compare some of those methods:
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    michaels>  EXEC dbms_application_info.set_client_info(0)
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    CI   
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    Moderator edit:
    This post was branched from an eleven-year-old long dead thread
    Java function call from Trigger in Oracle
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    Edited by: themadprogrammer on Aug 5, 2011 7:15 AM
    Edited by: themadprogrammer on Aug 5, 2011 7:21 AM
    Edited by: themadprogrammer on Aug 5, 2011 7:22 AM
    Edited by: themadprogrammer on Aug 5, 2011 7:23 AM
    Edited by: themadprogrammer on Aug 5, 2011 7:26 AM

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    //variablename = functionname(pass ur argument);
    change ur code like this.
    <!--- First, clean up the CFSCRIPT block --->
    <CFSCRIPT>
    function ExistingFunction(ParameterA) {
    //some codes here
    for ( i = 1; i LTE listLen( fileCon, crlf ); i = i + 1 ) {
    //some codes was written here to generate a 2 dimensional
    Array called: MyArray
    getIP=AddVal(MyArray);//syntax to call a function inside
    cfscript.
    </CFSCRIPT>
    <!--- since you're doing a query move this function
    outside the CFSCRIPT block
    ...you can still call it from your CFSCRIPT block --->
    <CFFUNCTION name="AddVal">
    <cfargument name="MyVal" type="Array" required="true">
    <cfquery name="MyQuery datasource="MyDatasource>
    // insert statement here
    </cfquery>
    </CFFUNCTION>
    try this and inform.

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