code: public Block locate(String sqlquery, Collection queryParams, Object locateId) {
  		return blockStrategy.locate(sqlquery, queryParams, locateId);
  	}
docs: looking for a block in that there is a primary key is equals to the
  locateId. for the sql sentence.
  
  @param sqlquery
  @param queryParams
  @param locateId
  @return if not locate, return null;