How can i get record by data block not by sql?
  
 I want to read and write lots of data by data blocks and write record to a 
appointed data block and read it.
 so i can form a disk-resident tree by recording the block address. But i don't 
know  how to implement in postgresql. 
 Is there system function can do this?  
 Can someone help me?? Thank you very very much!!!!1

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