Interface: QueryIntf

Interface for interacting with unparsed Queries, which represent queries arriving over the network that have not yet had ascii field names translated into schema indices.

Note that most interaction with queries after network delivery is done via ParsedQueryPtrs and ParsedQueryIntf.

This interface provides basic methods to set fields and expressions in queries and determine if queries contain all the records needed to be converted into ParsedQueries.

Author:

Sam Madden (madden@cs.berkeley.edu)

Components providing this interface:

tos.lib.TinyDB.Query

Components requiring this interface:

tos.lib.TinyDB.TupleRouterM

Commands

• short size(QueryPtr q)

  Returns:

  the size (in bytes) of the specified query

• Field getField(QueryPtr q, uint8_t idx)

  Returns:

  the idx'th field from the query

• result_t setField(QueryPtr q, uint8_t idx, Field f) Set the idxth field in the query to f

  Parameters:

  idx - The field to set f - The field ata query - The query whose idxth field should be set

• Expr getExpr(QueryPtr q, uint8_t idx)

  Returns:

  the idxth expression in the query

• result_t setExpr(QueryPtr q, uint8_t idx, Expr e) Set the idxth expression in the query

  Parameters:

  q - The query to set the expression in idx - The index of the expression to set e - The expression data to write

• bool fieldsComplete(Query q)

  Returns:

  TRUE iff all the fields in the query have been set

• bool exprsComplete(Query q)

  Returns:

  TRUE iff all the expressions in the query have been set