query.h


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#pragma once

#include "enginedata.h"
#include <vector>
#include <string>
#include <map>

using namespace std;


struct WhereClause{
	int col;
	RowItem value;
	WhereClause(void);
	WhereClause(const int _c,const RowItem &_v);
};


struct QueryResult{
	int res;
	vector<Row> rows;
	string msg; //empty message indicates success
	QueryResult(void);
	QueryResult(int);
	QueryResult(int,const vector<Row>&);
	QueryResult(int,const vector<Row>&,const string&);
	QueryResult(int,const string&);
};


struct Query{
	string tablename;
	virtual QueryResult execute(map<string,Table>&);
};

struct CreateQuery : public Query{
	int nc;
	ColHeader *header;
	CreateQuery(void);
	void setHeader(const ColHeader *hd);
	QueryResult execute(map<string,Table> &tables);
};

struct FindQuery : public Query{
	unsigned int limit; //-1=unlimited
	int sort; //0=no sort, 1=sort, -1=reverse sort
	vector<WhereClause> where;
	FindQuery(void);
	QueryResult execute(map<string,Table> &tables);
};

struct InsertQuery : public Query{
	Row row;
	InsertQuery(const Row &_r);
	InsertQuery(Row &&_r);
	QueryResult execute(map<string,Table> &tables);
};