In MySQL 5.4, prepared
      CALL statements can be used only
      for stored procedures that produce at most one result set. Nor can
      the calling application use placeholders for
      OUT or INOUT parameters.
    
      MySQL 5.5 expands prepared CALL
      statement support for stored procedures that produce multiple
      result sets and to provide placeholder access to
      OUT and INOUT parameters.
    


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