[Mapserver-users] Using the shapefile FID in a query

Mon Jun 28 09:52:52 PDT 2004

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I=92m puzzled over the behaviour of mapserver in returning query results
from shapefiles. It appears the FID field which is present in all of the
shape files I=92m using does not get returned by mapserver when we use =
any
of the mapscript query functions. There is no error, the field simply
isn=92t present in the return value. Is this by design, and is there a =
way
around this?
=20
This is causing me trouble as I need to have a generic way of
identifying a specific (unique) feature. For example, if I query a layer
and get back a list of 8 results from that query, I want to present
these to the user and give them the option of separately clicking on and
zooming to each of those items. To zoom and highlight a specific item I
need to use the FID =96 it=92s the only unique key I can count on.=20
=20
Thanks in advance.
=20
------------------------------
Mark Adams
Business & Systems Analyst
Cuesta Systems Inc.
5230 South Service Road
Burlington, ON L7L 5K2
Phone: 905-333-4544 x14
Fax: 905-333-0455
Email: markadams at cuestasys.com
=20

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<div class=3DSection1>

I’m puzzled over the behaviour of mapserver in
returning query results from shapefiles. It appears the FID field which =
is
present in all of the shape files I’m using does not get returned =
by
mapserver when we use any of the mapscript query functions. There is no =
error,
the field simply isn’t present in the return value. Is this by =
design,
and is there a way around this?<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>

This is causing me trouble as I need to have a =
generic way
of identifying a specific (unique) feature. For example, if I query a =
layer and
get back a list of 8 results from that query, I want to present these to =
the
user and give them the option of separately clicking on and zooming to =
each of
those items. To zoom and highlight a specific item I need to use the FID =
–
it’s the only unique key I can count on. =
<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Thanks in advance.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy;mso-no-proof:yes'>------------------=
------------</span></font><span
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy;mso-no-proof:yes'>Mark =
Adams</span></font><span
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy;mso-no-proof:yes'>Business & =
Systems
Analyst</span></font><span =
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy;mso-no-proof:yes'>Cuesta Systems =
Inc.</span></font><span
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoAutoSig><st1:Street><st1:address><font size=3D3 =
color=3Dnavy
  face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:navy;mso-no-proof:
  yes'>5230 South Service =
Road</span></font></st1:address></st1:Street><span
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoAutoSig><st1:place><st1:City><font size=3D3 color=3Dnavy
  face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:navy;mso-no-proof:
  yes'>Burlington</span></font></st1:City><font color=3Dnavy><span
 style=3D'color:navy;mso-no-proof:yes'>, </span></font><st1:State><font
  color=3Dnavy><span =
style=3D'color:navy;mso-no-proof:yes'>ON</span></font></st1:State><font
 color=3Dnavy><span style=3D'color:navy;mso-no-proof:yes'> =
</span></font><st1:PostalCode><font
  color=3Dnavy><span style=3D'color:navy;mso-no-proof:yes'>L7L =
5K2</span></font></st1:PostalCode></st1:place><span
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy;mso-no-proof:yes'>Phone: =
905-333-4544 x14</span></font><span
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy;mso-no-proof:yes'>Fax: =
905-333-0455</span></font><span
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy;mso-no-proof:yes'>Email:
markadams at cuestasys.com</span></font><span =
style=3D'mso-no-proof:yes'><o:p></o:p></span></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>

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