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105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
#include <type_traits>
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#include <ext/scope_guard.h>
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#include <Core/Defines.h>
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#include <DataTypes/DataTypeFactory.h>
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#include <IO/ReadHelpers.h>
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#include <IO/ReadWriteBufferFromHTTP.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTLiteral.h>
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#include <Parsers/parseQuery.h>
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#include <Storages/StorageXDBC.h>
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#include <TableFunctions/ITableFunction.h>
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#include <TableFunctions/ITableFunctionXDBC.h>
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#include <TableFunctions/TableFunctionFactory.h>
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#include <Poco/Net/HTTPRequest.h>
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#include <Common/Exception.h>
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#include <Common/typeid_cast.h>
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#include <Poco/NumberFormatter.h>
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#include "registerTableFunctions.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 NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int UNKNOWN_EXCEPTION;
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extern const int LOGICAL_ERROR;
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}
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StoragePtr ITableFunctionXDBC::executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name) const
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{
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const auto & args_func = ast_function->as<ASTFunction &>();
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if (!args_func.arguments)
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throw Exception("Table function '" + getName() + "' must have arguments.", ErrorCodes::LOGICAL_ERROR);
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ASTs & args = args_func.arguments->children;
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if (args.size() != 2 && args.size() != 3)
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throw Exception("Table function '" + getName() + "' requires 2 or 3 arguments: " + getName() + "('DSN', table) or " + getName()
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+ "('DSN', schema, table)",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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for (auto & arg : args)
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arg = evaluateConstantExpressionOrIdentifierAsLiteral(arg, context);
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std::string connection_string;
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std::string schema_name;
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std::string remote_table_name;
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if (args.size() == 3)
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{
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connection_string = args[0]->as<ASTLiteral &>().value.safeGet<String>();
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schema_name = args[1]->as<ASTLiteral &>().value.safeGet<String>();
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remote_table_name = args[2]->as<ASTLiteral &>().value.safeGet<String>();
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}
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else if (args.size() == 2)
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{
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connection_string = args[0]->as<ASTLiteral &>().value.safeGet<String>();
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remote_table_name = args[1]->as<ASTLiteral &>().value.safeGet<String>();
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}
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context.checkAccess(getRequiredAccessType());
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/* Infer external table structure */
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/// Have to const_cast, because bridges store their commands inside context
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BridgeHelperPtr helper = createBridgeHelper(const_cast<Context &>(context), context.getSettingsRef().http_receive_timeout.value, connection_string);
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helper->startBridgeSync();
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Poco::URI columns_info_uri = helper->getColumnsInfoURI();
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columns_info_uri.addQueryParameter("connection_string", connection_string);
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if (!schema_name.empty())
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columns_info_uri.addQueryParameter("schema", schema_name);
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columns_info_uri.addQueryParameter("table", remote_table_name);
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const auto use_nulls = context.getSettingsRef().external_table_functions_use_nulls;
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columns_info_uri.addQueryParameter("external_table_functions_use_nulls",
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Poco::NumberFormatter::format(use_nulls));
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ReadWriteBufferFromHTTP buf(columns_info_uri, Poco::Net::HTTPRequest::HTTP_POST, nullptr);
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std::string columns_info;
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readStringBinary(columns_info, buf);
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NamesAndTypesList columns = NamesAndTypesList::parse(columns_info);
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auto result = std::make_shared<StorageXDBC>(StorageID(getDatabaseName(), table_name), schema_name, remote_table_name, ColumnsDescription{columns}, context, helper);
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if (!result)
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throw Exception("Failed to instantiate storage from table function " + getName(), ErrorCodes::UNKNOWN_EXCEPTION);
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result->startup();
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return result;
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}
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void registerTableFunctionJDBC(TableFunctionFactory & factory)
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{
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factory.registerFunction<TableFunctionJDBC>();
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}
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void registerTableFunctionODBC(TableFunctionFactory & factory)
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{
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factory.registerFunction<TableFunctionODBC>();
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}
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}
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