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#include <Databases/DatabasesOverlay.h>
#include <Common/typeid_cast.h>
#include <Interpreters/Context.h>
#include <Interpreters/InterpreterCreateQuery.h>
#include <Parsers/ASTCreateQuery.h>
#include <Storages/IStorage_fwd.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int CANNOT_GET_CREATE_TABLE_QUERY;
}
DatabasesOverlay::DatabasesOverlay(const String & name_, ContextPtr context_)
: IDatabase(name_), WithContext(context_->getGlobalContext()), log(&Poco::Logger::get("DatabaseOverlay(" + name_ + ")"))
{
}
DatabasesOverlay & DatabasesOverlay::registerNextDatabase(DatabasePtr database)
{
databases.push_back(std::move(database));
return *this;
}
bool DatabasesOverlay::isTableExist(const String & table_name, ContextPtr context_) const
{
for (const auto & db : databases)
{
if (db->isTableExist(table_name, context_))
return true;
}
return false;
}
StoragePtr DatabasesOverlay::tryGetTable(const String & table_name, ContextPtr context_) const
{
StoragePtr result = nullptr;
for (const auto & db : databases)
{
result = db->tryGetTable(table_name, context_);
if (result)
break;
}
return result;
}
void DatabasesOverlay::createTable(ContextPtr context_, const String & table_name, const StoragePtr & table, const ASTPtr & query)
{
for (auto & db : databases)
{
if (!db->isReadOnly())
{
db->createTable(context_, table_name, table, query);
return;
}
}
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"There is no databases for CREATE TABLE `{}` query in database `{}` (engine {})",
table_name,
getDatabaseName(),
getEngineName());
}
void DatabasesOverlay::dropTable(ContextPtr context_, const String & table_name, bool sync)
{
for (auto & db : databases)
{
if (db->isTableExist(table_name, context_))
{
db->dropTable(context_, table_name, sync);
return;
}
}
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"There is no databases for DROP TABLE `{}` query in database `{}` (engine {})",
table_name,
getDatabaseName(),
getEngineName());
}
void DatabasesOverlay::attachTable(
ContextPtr context_, const String & table_name, const StoragePtr & table, const String & relative_table_path)
{
for (auto & db : databases)
{
try
{
db->attachTable(context_, table_name, table, relative_table_path);
return;
}
catch (...)
{
continue;
}
}
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"There is no databases for ATTACH TABLE `{}` query in database `{}` (engine {})",
table_name,
getDatabaseName(),
getEngineName());
}
StoragePtr DatabasesOverlay::detachTable(ContextPtr context_, const String & table_name)
{
StoragePtr result = nullptr;
for (auto & db : databases)
{
if (db->isTableExist(table_name, context_))
return db->detachTable(context_, table_name);
}
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"There is no databases for DETACH TABLE `{}` query in database `{}` (engine {})",
table_name,
getDatabaseName(),
getEngineName());
}
ASTPtr DatabasesOverlay::getCreateTableQueryImpl(const String & name, ContextPtr context_, bool throw_on_error) const
{
ASTPtr result = nullptr;
for (const auto & db : databases)
{
result = db->tryGetCreateTableQuery(name, context_);
if (result)
break;
}
if (!result && throw_on_error)
throw Exception(
ErrorCodes::CANNOT_GET_CREATE_TABLE_QUERY,
"There is no metadata of table `{}` in database `{}` (engine {})",
name,
getDatabaseName(),
getEngineName());
return result;
}
/*
* DatabaseOverlay cannot be constructed by "CREATE DATABASE" query, as it is not a traditional ClickHouse database
* To use DatabaseOverlay, it must be constructed programmatically in code
*/
ASTPtr DatabasesOverlay::getCreateDatabaseQuery() const
{
return std::make_shared<ASTCreateQuery>();
}
String DatabasesOverlay::getTableDataPath(const String & table_name) const
{
String result;
for (const auto & db : databases)
{
result = db->getTableDataPath(table_name);
if (!result.empty())
break;
}
return result;
}
String DatabasesOverlay::getTableDataPath(const ASTCreateQuery & query) const
{
String result;
for (const auto & db : databases)
{
result = db->getTableDataPath(query);
if (!result.empty())
break;
}
return result;
}
UUID DatabasesOverlay::tryGetTableUUID(const String & table_name) const
{
UUID result = UUIDHelpers::Nil;
for (const auto & db : databases)
{
result = db->tryGetTableUUID(table_name);
if (result != UUIDHelpers::Nil)
break;
}
return result;
}
void DatabasesOverlay::drop(ContextPtr context_)
{
for (auto & db : databases)
db->drop(context_);
}
void DatabasesOverlay::alterTable(ContextPtr local_context, const StorageID & table_id, const StorageInMemoryMetadata & metadata)
{
for (auto & db : databases)
{
if (!db->isReadOnly() && db->isTableExist(table_id.table_name, local_context))
{
db->alterTable(local_context, table_id, metadata);
return;
}
}
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"There is no databases for ALTER TABLE `{}` query in database `{}` (engine {})",
table_id.table_name,
getDatabaseName(),
getEngineName());
}
std::vector<std::pair<ASTPtr, StoragePtr>>
DatabasesOverlay::getTablesForBackup(const FilterByNameFunction & filter, const ContextPtr & local_context) const
{
std::vector<std::pair<ASTPtr, StoragePtr>> result;
for (const auto & db : databases)
{
auto db_backup = db->getTablesForBackup(filter, local_context);
result.insert(result.end(), std::make_move_iterator(db_backup.begin()), std::make_move_iterator(db_backup.end()));
}
return result;
}
void DatabasesOverlay::createTableRestoredFromBackup(
const ASTPtr & create_table_query,
ContextMutablePtr local_context,
std::shared_ptr<IRestoreCoordination> /*restore_coordination*/,
UInt64 /*timeout_ms*/)
{
/// Creates a tables by executing a "CREATE TABLE" query.
InterpreterCreateQuery interpreter{create_table_query, local_context};
interpreter.setInternal(true);
interpreter.execute();
}
bool DatabasesOverlay::empty() const
{
for (const auto & db : databases)
{
if (!db->empty())
return false;
}
return true;
}
void DatabasesOverlay::shutdown()
{
for (auto & db : databases)
db->shutdown();
}
DatabaseTablesIteratorPtr DatabasesOverlay::getTablesIterator(ContextPtr context_, const FilterByNameFunction & filter_by_table_name) const
{
Tables tables;
for (const auto & db : databases)
{
for (auto table_it = db->getTablesIterator(context_, filter_by_table_name); table_it->isValid(); table_it->next())
tables.insert({table_it->name(), table_it->table()});
}
return std::make_unique<DatabaseTablesSnapshotIterator>(std::move(tables), getDatabaseName());
}
}
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