100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
#ifndef __SELECT_STATEMENT_H__
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#define __SELECT_STATEMENT_H__
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#include "SQLStatement.h"
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#include "Expr.h"
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#include "Table.h"
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namespace hsql {
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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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/**
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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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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() {
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delete expr;
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}
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OrderType type;
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Expr* expr;
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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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/**
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* Description of the limit clause within a select statement
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*/
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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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* Description of the group-by clause within a select statement
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*/
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struct GroupByDescription {
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GroupByDescription() :
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columns(NULL),
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having(NULL) {}
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~GroupByDescription() {
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delete columns;
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delete having;
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}
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std::vector<Expr*>* columns;
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Expr* having;
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};
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/**
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* Representation of a full SQL select statement.
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* TODO: add union_order and union_limit
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*/
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struct SelectStatement : SQLStatement {
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SelectStatement() :
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SQLStatement(kStmtSelect),
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fromTable(NULL),
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selectDistinct(false),
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selectList(NULL),
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whereClause(NULL),
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groupBy(NULL),
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unionSelect(NULL),
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order(NULL),
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limit(NULL) {};
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virtual ~SelectStatement() {
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delete fromTable;
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delete selectList;
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delete whereClause;
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delete groupBy;
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delete order;
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delete limit;
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}
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TableRef* fromTable;
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bool selectDistinct;
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std::vector<Expr*>* selectList;
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Expr* whereClause;
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GroupByDescription* groupBy;
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SelectStatement* unionSelect;
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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 |