ClickHouse/dbms/include/DB/Parsers/ParserUseQuery.h

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2012-07-12 19:49:22 +00:00
#pragma once
#include <DB/Parsers/IParserBase.h>
#include <DB/Parsers/ExpressionElementParsers.h>
#include <DB/Parsers/CommonParsers.h>
#include <DB/Parsers/ASTIdentifier.h>
#include <DB/Parsers/ASTUseQuery.h>
namespace DB
{
/** Запрос USE db
*/
class ParserUseQuery : public IParserBase
{
protected:
String getName() { return "USE query"; }
bool parseImpl(Pos & pos, Pos end, ASTPtr & node, String & expected)
{
Pos begin = pos;
ParserWhiteSpaceOrComments ws;
ParserString s_use("USE", true, true);
ParserIdentifier name_p;
ASTPtr database;
ws.ignore(pos, end);
if (!s_use.ignore(pos, end, expected))
return false;
ws.ignore(pos, end);
if (!name_p.parse(pos, end, database, expected))
return false;
ws.ignore(pos, end);
ASTUseQuery * query = new ASTUseQuery(StringRange(begin, pos));
node = query;
query->database = dynamic_cast<ASTIdentifier &>(*database).name;
return true;
}
};
}