ClickHouse/dbms/include/DB/Parsers/ASTDropQuery.h
2016-06-08 16:08:20 +03:00

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#pragma once
#include <DB/Parsers/IAST.h>
namespace DB
{
/** DROP запрос
*/
class ASTDropQuery : public IAST
{
public:
bool detach{false}; /// Запрос DETACH, а не DROP.
bool if_exists{false};
String database;
String table;
ASTDropQuery() = default;
ASTDropQuery(const StringRange range_) : IAST(range_) {}
/** Получить текст, который идентифицирует этот элемент. */
String getID() const override { return (detach ? "DetachQuery_" : "DropQuery_") + database + "_" + table; };
ASTPtr clone() const override { return std::make_shared<ASTDropQuery>(*this); }
protected:
void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
{
if (table.empty() && !database.empty())
{
settings.ostr << (settings.hilite ? hilite_keyword : "")
<< (detach ? "DETACH DATABASE " : "DROP DATABASE ")
<< (if_exists ? "IF EXISTS " : "")
<< (settings.hilite ? hilite_none : "")
<< backQuoteIfNeed(database);
return;
}
settings.ostr << (settings.hilite ? hilite_keyword : "")
<< (detach ? "DETACH TABLE " : "DROP TABLE ")
<< (if_exists ? "IF EXISTS " : "") << (settings.hilite ? hilite_none : "")
<< (!database.empty() ? backQuoteIfNeed(database) + "." : "") << backQuoteIfNeed(table);
}
};
}