void DatabaseOrdinary::renameTable(
const Context & context, const String & table_name, IDatabase & to_database, const String & to_table_name)
{
DatabaseOrdinary * to_database_concrete = typeid_cast<DatabaseOrdinary *>(&to_database);
if (!to_database_concrete)
throw Exception("Moving tables between databases of different engines is not supported", ErrorCodes::NOT_IMPLEMENTED);
StoragePtr table = tryGetTable(table_name);
if (!table)
throw Exception("Table " + name + "." + table_name + " doesn't exist.", ErrorCodes::TABLE_ALREADY_EXISTS);
/// Уведомляем таблицу о том, что она переименовывается. Если таблица не поддерживает переименование - кинется исключение.
try
{
table->rename(context.getPath() + "/data/" + escapeForFileName(to_database_concrete->name) + "/",
to_database_concrete->name,
to_table_name);
}
catch (const Poco::Exception & e)
{
/// Более хорошая диагностика.
throw Exception{e};
}
ASTPtr ast = getCreateQueryImpl(path, table_name);
ASTCreateQuery & ast_create_query = typeid_cast<ASTCreateQuery &>(*ast);
ast_create_query.table = to_table_name;
/// NOTE Неатомарно.
to_database_concrete->createTable(to_table_name, table, ast, table->getName());
removeTable(table_name);
}
void DatabaseOrdinary::renameTable(
const Context & context,
const String & table_name,
IDatabase & to_database,
const String & to_table_name)
{
DatabaseOrdinary * to_database_concrete = typeid_cast<DatabaseOrdinary *>(&to_database);
if (!to_database_concrete)
throw Exception("Moving tables between databases of different engines is not supported", ErrorCodes::NOT_IMPLEMENTED);
StoragePtr table = tryGetTable(context, table_name);
if (!table)
throw Exception("Table " + name + "." + table_name + " doesn't exist.", ErrorCodes::UNKNOWN_TABLE);
/// Notify the table that it is renamed. If the table does not support renaming, exception is thrown.
try
{
table->rename(context.getPath() + "/data/" + escapeForFileName(to_database_concrete->name) + "/",
to_database_concrete->name,
to_table_name);
}
catch (const Exception &)
{
throw;
}
catch (const Poco::Exception & e)
{
/// Better diagnostics.
throw Exception{e};
}
ASTPtr ast = getQueryFromMetadata(detail::getTableMetadataPath(metadata_path, table_name));
if (!ast)
throw Exception("There is no metadata file for table " + table_name, ErrorCodes::FILE_DOESNT_EXIST);
ASTCreateQuery & ast_create_query = typeid_cast<ASTCreateQuery &>(*ast);
ast_create_query.table = to_table_name;
/// NOTE Non-atomic.
to_database_concrete->createTable(context, to_table_name, table, ast);
removeTable(context, table_name);
}
ASTPtr DatabaseOrdinary::getCreateTableQueryImpl(const Context & context,
const String & table_name, bool throw_on_error) const
{
ASTPtr ast;
auto table_metadata_path = detail::getTableMetadataPath(metadata_path, table_name);
ast = getCreateQueryFromMetadata(table_metadata_path, name, throw_on_error);
if (!ast && throw_on_error)
{
/// Handle system.* tables for which there are no table.sql files.
bool has_table = tryGetTable(context, table_name) != nullptr;
auto msg = has_table
? "There is no CREATE TABLE query for table "
: "There is no metadata file for table ";
throw Exception(msg + table_name, ErrorCodes::CANNOT_GET_CREATE_TABLE_QUERY);
}
return ast;
}
