function readOnly(count){ }
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Do you have a code snippet which you have already tried. This forum is for helping where you stuck and looks like you're expecting someone to write the whole code for you. Please provide the code which you have written so far and having issues with.
Try the code as suggested in the below article,
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_dml_examples_insert_update.htm