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83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
#include <TableFunctions/TableFunctionPostgreSQL.h>
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#if USE_LIBPQXX
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#include <Databases/PostgreSQL/fetchPostgreSQLTableStructure.h>
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#include <Storages/StoragePostgreSQL.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include <Parsers/ASTFunction.h>
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#include <TableFunctions/ITableFunction.h>
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#include <TableFunctions/TableFunctionFactory.h>
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#include <Common/Exception.h>
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#include "registerTableFunctions.h"
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#include <Common/parseRemoteDescription.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int BAD_ARGUMENTS;
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}
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StoragePtr TableFunctionPostgreSQL::executeImpl(const ASTPtr & /*ast_function*/,
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ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
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{
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auto columns = getActualTableStructure(context);
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auto result = std::make_shared<StoragePostgreSQL>(
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StorageID(getDatabaseName(), table_name),
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connection_pool,
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configuration->table,
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columns,
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ConstraintsDescription{},
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String{},
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configuration->schema,
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configuration->on_conflict);
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result->startup();
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return result;
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}
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ColumnsDescription TableFunctionPostgreSQL::getActualTableStructure(ContextPtr context) const
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{
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const bool use_nulls = context->getSettingsRef().external_table_functions_use_nulls;
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auto connection_holder = connection_pool->get();
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auto columns_info = fetchPostgreSQLTableStructure(
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connection_holder->get(), configuration->table, configuration->schema, use_nulls).physical_columns;
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if (!columns_info)
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throw Exception(ErrorCodes::BAD_ARGUMENTS, "Table structure not returned");
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return ColumnsDescription{columns_info->columns};
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}
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void TableFunctionPostgreSQL::parseArguments(const ASTPtr & ast_function, ContextPtr context)
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{
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const auto & func_args = ast_function->as<ASTFunction &>();
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if (!func_args.arguments)
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throw Exception("Table function 'PostgreSQL' must have arguments.", ErrorCodes::BAD_ARGUMENTS);
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configuration.emplace(StoragePostgreSQL::getConfiguration(func_args.arguments->children, context));
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const auto & settings = context->getSettingsRef();
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connection_pool = std::make_shared<postgres::PoolWithFailover>(
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*configuration,
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settings.postgresql_connection_pool_size,
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settings.postgresql_connection_pool_wait_timeout,
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POSTGRESQL_POOL_WITH_FAILOVER_DEFAULT_MAX_TRIES,
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settings.postgresql_connection_pool_auto_close_connection);
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}
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void registerTableFunctionPostgreSQL(TableFunctionFactory & factory)
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{
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factory.registerFunction<TableFunctionPostgreSQL>();
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}
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}
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#endif
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