79 lines
1.5 KiB
C++
79 lines
1.5 KiB
C++
#ifndef __SELECT_STATEMENT_H__
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#define __SELECT_STATEMENT_H__
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#include "Statement.h"
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#include "Expr.h"
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#include "List.h"
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#include "Table.h"
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namespace hsql {
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/**
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* @struct OrderDescription
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* Description of the order by clause within a select statement
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* TODO: hold multiple expressions to be sorted by
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*/
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typedef enum {
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kOrderAsc,
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kOrderDesc
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} OrderType;
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struct OrderDescription {
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OrderDescription(OrderType type, Expr* expr) :
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type(type),
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expr(expr) {}
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virtual ~OrderDescription(); // defined in destructors.cpp
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OrderType type;
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Expr* expr;
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};
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/**
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* @struct LimitDescription
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* Description of the limit clause within a select statement
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*/
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const int64_t kNoLimit = -1;
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const int64_t kNoOffset = -1;
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struct LimitDescription {
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LimitDescription(int64_t limit, int64_t offset) :
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limit(limit),
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offset(offset) {}
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int64_t limit;
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int64_t offset;
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};
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/**
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* @struct SelectStatement
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* Representation of a full select statement.
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* TODO: add union_order and union_limit
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*/
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struct SelectStatement : Statement {
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SelectStatement() :
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Statement(kStmtSelect),
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from_table(NULL),
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select_list(NULL),
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where_clause(NULL),
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group_by(NULL),
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union_select(NULL),
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order(NULL),
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limit(NULL) {};
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virtual ~SelectStatement(); // defined in destructors.cpp
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TableRef* from_table;
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List<Expr*>* select_list;
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Expr* where_clause;
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List<Expr*>* group_by;
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SelectStatement* union_select;
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OrderDescription* order;
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LimitDescription* limit;
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};
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} // namespace hsql
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#endif |