ClickHouse/dbms/src/Databases/DatabaseOrdinary.h

#pragma once

#include <Databases/DatabasesCommon.h>
#include <Common/ThreadPool.h>


namespace DB
{

/** Default engine of databases.
  * It stores tables list in filesystem using list of .sql files,
  *  that contain declaration of table represented by SQL ATTACH TABLE query.
  */
class DatabaseOrdinary : public DatabaseWithOwnTablesBase
{
public:
    DatabaseOrdinary(String name_, const String & metadata_path_, const Context & context);

    String getEngineName() const override { return "Ordinary"; }

    void loadTables(
        Context & context,
        bool has_force_restore_data_flag) override;

    void createTable(
        const Context & context,
        const String & table_name,
        const StoragePtr & table,
        const ASTPtr & query) override;

    void removeTable(
        const Context & context,
        const String & table_name) override;

    void renameTable(
        const Context & context,
        const String & table_name,
        IDatabase & to_database,
        const String & to_table_name,
        TableStructureWriteLockHolder &) override;

    void alterTable(
        const Context & context,
        const String & name,
        const ColumnsDescription & columns,
        const IndicesDescription & indices,
        const ConstraintsDescription & constraints,
        const ASTModifier & engine_modifier) override;

    time_t getTableMetadataModificationTime(
        const Context & context,
        const String & table_name) override;

    ASTPtr getCreateTableQuery(
        const Context & context,
        const String & table_name) const override;

    ASTPtr tryGetCreateTableQuery(
        const Context & context,
        const String & table_name) const override;

    ASTPtr getCreateDatabaseQuery(const Context & context) const override;

    String getDataPath() const override;
    String getDatabaseName() const override;
    String getMetadataPath() const override;
    String getTableMetadataPath(const String & table_name) const override;

    void drop() override;

private:
    const String metadata_path;
    const String data_path;
    Poco::Logger * log;

    void startupTables(ThreadPool & thread_pool);

    ASTPtr getCreateTableQueryImpl(const Context & context, const String & table_name, bool throw_on_error) const;
};

}