#pragma once #include #include #include namespace DB { /** USE query */ class ASTUseQuery : public IAST { public: String database; /** Get the text that identifies this element. */ String getID(char delim) const override { return "UseQuery" + (delim + database); } ASTPtr clone() const override { return std::make_shared(*this); } protected: void formatImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const override { settings.ostr << (settings.hilite ? hilite_keyword : "") << "USE " << (settings.hilite ? hilite_none : "") << backQuoteIfNeed(database); } }; }