dcsimg
Database Journal
MS SQL Oracle DB2 Access MySQL PostgreSQL Sybase PHP SQL Etc SQL Scripts & Samples Tips Database Forum

» Database Journal Home
» Database Articles
» Database Tutorials
MS SQL
Oracle
DB2
MS Access
MySQL
» RESOURCES
SQL Scripts & Samples
Tips
» Database Forum
» Slideshows
» Sitemap
Free Newsletters:
DatabaseDaily  

By submitting your information, you agree that databasejournal.com may send you databasejournal offers via email, phone and text message, as well as email offers about other products and services that databasejournal believes may be of interest to you. databasejournal will process your information in accordance with the Quinstreet Privacy Policy.

News Via RSS Feed


Database Journal |DBA Support |SQLCourse |SQLCourse2
 

Featured Database Articles

Oracle

Posted Nov 25, 2002

Abstracting Oracle Connectivity with PHP/OCI8 - Page 4

By DatabaseJournal.com Staff



Examples - A Simple SELECT statement

In this example, I execute a simple SELECT statement. The input is a customer's login name, and I select out some made-up columns named COLA, COLB, and COLC from a made up table SAMPLETABLE.

A nice feature of this function is that I might get a return code of false. A 'FALSE' return code means that something failed. A failure might occur in the connect, bind, parse, execute...etc. Well, if I really cared, I could look at the $OCI8Hook->ERROR string to read that error message. Most of the time I DON'T care, though...so I give a happy error message to the user and read the Apache log files later.


    //----------------------------------------------------------------------
    /**
     * Will select a two dimensional array containing COLA then COLB
     * which should have access from this login. $data[COLA][COLB]...
     * Return:
     *      false   - System Error
     *      array   - Success.
     */
    function simple_select_example($login) {
        $sql = sprintf("
            SELECT  COLA, COLB, COLC
            FROM    SAMPLETABLE
            WHERE   LOGIN = LOWER(:IN_LOGIN)
        ");

        // Set up our Bind args...
        $bargs = array();
        array_push($bargs, array("IN_LOGIN", $login, -1));

        // run the query...
        $stmt   = $this->query("DBXYZ", $sql, $bargs);
        if (! $stmt) return(false);
        
        // loop through the returned rows and convert to a PHP array
        $data = array();
        while (@OCIFetchInto($stmt, $row, OCI_ASSOC | OCI_RETURN_NULLS)) {
            $data[$row["COLA"]][$row["COLB"]] = 1;
        }
        
        // return the data that we just fetched...
        return ($data);
    }
    //----------------------------------------------------------------------


Example - An INSERT statement with error checking

A lot of Oracle programmers want to have certainty that an insert or update operation was performed successfully. Here is an example where I wrap an INSERT statement in a chunk of PL/SQL so that I'll get a clear success code of '7' when the insert works. Remember that our OCI8Hook class always returns 'false' on error. So, if we get a FALSE from this function, we still assume an error. I need an error code which is NOT 0 or false or "" in order to ensure success. Here is my solution:


    //----------------------------------------------------------------------
    /*
     * Return
     *  0   - System Error
     *  7   - Success
     */
    function sample_insert($value1, $value2, $value3) {
        // build the query we'll be sending in...
        $sql = sprintf("
        BEGIN
            :RETURN_CODE := 0;
            INSERT INTO sampletable
                    (cola, colb, colc)
                VALUES (LOWER(:IN_VALUE1), UPPER(:IN_VALUE2), LOWER(:IN_VALUE3));
            :RETURN_CODE := 7;
        EXCEPTION
            WHEN OTHERS THEN
                :RETURN_CODE := 0;
        END;
        ");

        // Set up our Bind args...
        $bargs = array();
        array_push($bargs, array("IN_VALUE1", $value1, -1));
        array_push($bargs, array("IN_VALUE2", $value2, -1));
        array_push($bargs, array("IN_VALUE3", $value3, -1));
        array_push($bargs, array("RETURN_CODE", "", 32));

        // run the query...
        $stmt   = $this->query("DBXYZ", $sql, $bargs);
        if (! $stmt) return(false);
        
        // return the return code (if it's there)...
        if (array_key_exists("RETURN_CODE", $bargs)) {
            return ($bargs["RETURN_CODE"]);
        }

        // it doesn't seem to be working...
        return(false);
    }

    //----------------------------------------------------------------------


Page 5: Switching Between Dev, QA, and Production Environments




Oracle Archives

Comment and Contribute

 


(Maximum characters: 1200). You have characters left.

 

 




Latest Forum Threads
Oracle Forum
Topic By Replies Updated
Oracle Data Mining: Classification jan.hasller 0 July 5th, 07:19 AM
Find duplicates - Unique IDs Lava 5 July 2nd, 08:30 AM
no matching unique or primary key rcanter 1 April 25th, 12:32 PM
Update values of one table based on condition of values in other table using Trigger Gladiator 3 February 29th, 06:01 PM