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PHP PL/SQL Function Return

with 5 comments

Somebody wanted an example of how to capture the return value of a PL/SQL function in a PHP script running against the Oracle Database. The trick is embedding the call inside an anonymous block program unit, like a prior example that I posted on handling an OUT mode variable in a PL/SQL Procedure.

Here’s the sample PHP code:

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<?php
  // Attempt to connect to your database.
  $c = @oci_connect("student", "student", "localhost/orcl");
  if (!$c) {
    print "Sorry! The connection to the database failed. Please try again later.";
    die();
  }
  else {
    // Initialize incoming message whether or not parameter sent.
    $msg_in = (isset($_GET['msg'])) ? $_GET['msg'] : "Cat got your keyboard?";
 
    // Set the call statement, like a SQL statement.
    $sql = "BEGIN :b := echo(:a); END;";
 
    // Prepare the statement and bind the two strings.
    $stmt = oci_parse($c,$sql);
 
    // Bind local variables into PHP statement, you MUST size OUT only variables.
    oci_bind_by_name($stmt, ":a", $msg_in);
    oci_bind_by_name($stmt, ":b", $msg_out, 80, SQLT_CHR);
 
    // Execute it and print success or failure message.
    if (oci_execute($stmt)) {
      print $msg_out;
    }
    else {
      print "Sorry, I can't do that Dave...";
    }
 
    // Free resources.
    oci_free_statement($stmt);
    oci_close($c);
  }
?>

As noted by Chris, you should size input parameters too. It could be qualified as a best practice when code re-executes with different values without rebinding.

It depends on this echo function:

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CREATE OR REPLACE FUNCTION echo
( message IN     VARCHAR2 ) RETURN VARCHAR2 IS
BEGIN
  RETURN 'Message ['||message||'] received.';
END;
/

Hope that this is what they needed, or you’re looking for as an answer to a search.

Written by maclochlainn

May 28th, 2013 at 12:36 pm

Posted in OPAL,Oracle,Oracle 11g,PHP

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