[Zope] Cannot pass parameters to Externa Method From inside a DTML Method

4 Aug 2005

      I have in my "Extensions" folder the file
"TestODBCEM.py" witch contains the following code to
select and return 40 rows by 8 columns of a query:

def TestODBCEM(self, sysDSN="defDSN", usr="defUsr",
mypass="defPass", sSQL="SELECT * FROM defTable",
xx=40, yy=8):
   id = self.id
   import dbi
   import odbc
   connection=odbc.odbc(sysDSN+'/'+usr+'/'+mypass)
   cur=connection.cursor()
   cur.execute(sSQL)
   data=cur.fetchall()
   a=""
   for x in range(0,int(xx)):
      for y in range(0,int(yy)):
         if data[x][y]=="":
            a=a+"Null"+"---"
         else:
            a=a+str(data[x][y])+" --- "
      a=a+"\n"
   return data

I have used it and created an External Method in my
Zope name "TestODBCEM"

next i created a DTML Method named
"GetQueryParamsDTML" with the following :

<html>
<head>
</head>
  I will connect using : "<dtml-var id>" System DSN
  Type the query to execute...
  <form name="Params" action="./TestODBCEM"
method="POST">
        <input type="hidden" name="sysDSN:string"
value=<dtml-var id>>
        The SQL Query to be executed against the above
DSN connection
        	<input name="sSQL:string"><br>
         <input type="hidden" name="mypass:string"
value=<dtml-var passWD>><br>
         <input type="hidden" name="usr:string"
value=<dtml-var usrID>><br>
	<input type="submit" value=" Execute "><br>
   </form>
</html>

and everything is ok as it returns something like this
:
[(1, 1054, 1001, '\xc1\xd0\xcf\xd3\xc2', 1001, 101,
'\xc1\xd0\xcf\xd3\xc2\xc5\xd3\xc5\xc9\xd3
\xd7\xd1\xc7\xd3\xc7\xd3', None, 1, None, None, None,
None, None, 1, 1, 0, None, None, None, None, None,
1054, 1054, 1, 0, 0, 0, None, None, None, 0, None,
None, None, 0, None, None, None, 0, 0, 0, None, None,
None, 0, 0), (1, 1054, 9001, '\xc1\xd0\xcf\xd.....

Now i want to format the results to show them
so i change my "GetQueryParamsDTML" as follows:

<html>
<head>
</head>
  I will connect using : "<dtml-var id>" System DSN
  Type the query to execute...
  <form name="Params" action="./ShowResults"
method="POST">
        <input type="hidden" name="sysDSN:string"
value=<dtml-var id>>
        The SQL Query to be executed against the above
DSN connection
        	<input name="sSQL:string"><br>
         <input type="hidden" name="mypass:string"
value=<dtml-var passWD>><br>
         <input type="hidden" name="usr:string"
value=<dtml-var usrID>><br>
	<input type="submit" value=" Execute "><br>
   </form>
</html>     

Now it calls another DTML Method named "ShowResults"
witch reads like this:

<dtml-var standard_html_header>
<table border="1">
<dtml-in TestODBCEM>
  <dtml-if sequence-even>
    <tr bgcolor="lightgreen">
  <dtml-else>
    <tr>
  </dtml-if>
  <dtml-in sequence-item>
    <td><dtml-var sequence-item></td>
  </dtml-in>
  </tr>    
</dtml-in>
<dtml-var standard_html_footer>

The problem know is that, althought the params of the
GetQueryParamsDTML is passed to ShowResults through
the REQUEST, the TestODBCEM does not use them. Instead
the code is always using the defValues of its def
line.
When i was calling ./TestODBC from GetQueryParamsDTML 
it was using the parameters i was submiting.

I tried to change the follong line of ShowResults :
<dtml-in TestODBCEM>
to:
<dtml-in expr="TestODBCEM('<dtml-var sysDSN>',
'<dtml-var usr>', '<dtml-var mypass>', '<dtml-var
sSQL>')">

but this one gives me an AttributeError ('str' object
has no attribute 'id').

Does anyone know what am i doing wrong?
I would apreciate it if you could help me.

I use Zope 2.7.0 on windows XP PRO, witch i use after
installing Plone 2.0.5 executable installer.
It uses Python 2.3.3

Thanks in advance.

Thomas Apostolou

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