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I have a point layer (shapefile) insert to PostGIS. I'm using MapServer and OpenLayers to display layer on map. Now, I want get lon/lat of all features of the layer.

Hope somebody can help me.

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    Please clarify your answer. Do you want to get the points in PostGIS or on the web using openlayers ? – Ahsan Mukhtar Aug 8 '17 at 11:14
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To extract lon/lat in text format from a database table, you can do something like:

SELECT ST_X(geom), ST_Y(geom) FROM yourgeospatialtable; 

Where geom is the spatially enabled column.

There probably is also an OpenLayers function to do that, but I am not exactly sure where you want to do it (server/client?)

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