ClickHouse/dbms/src/Interpreters/InterpreterDropQuery.h

44 lines
1.2 KiB
C++

#pragma once
#include <Interpreters/IInterpreter.h>
#include <Parsers/ASTDropQuery.h>
#include <Databases/IDatabase.h>
namespace DB
{
class Context;
class IAST;
using ASTPtr = std::shared_ptr<IAST>;
using DatabaseAndTable = std::pair<DatabasePtr, StoragePtr>;
/** Allow to either drop table with all its data (DROP),
* or remove information about table (just forget) from server (DETACH),
* or just clear all data in table (TRUNCATE).
*/
class InterpreterDropQuery : public IInterpreter
{
public:
InterpreterDropQuery(const ASTPtr & query_ptr_, Context & context_);
/// Drop table or database.
BlockIO execute() override;
private:
void checkAccess(const ASTDropQuery & drop);
ASTPtr query_ptr;
Context & context;
BlockIO executeToDatabase(String & database_name, ASTDropQuery::Kind kind, bool if_exists);
BlockIO executeToTable(String & database_name, String & table_name, ASTDropQuery::Kind kind, bool if_exists, bool if_temporary);
DatabasePtr tryGetDatabase(String & database_name, bool exists);
DatabaseAndTable tryGetDatabaseAndTable(String & database_name, String & table_name, bool if_exists);
BlockIO executeToTemporaryTable(String & table_name, ASTDropQuery::Kind kind);
};
}