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175 lines
6.2 KiB
C++
175 lines
6.2 KiB
C++
#include "ColumnInfoHandler.h"
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#if USE_ODBC
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# include <DataTypes/DataTypeFactory.h>
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# include <DataTypes/DataTypeNullable.h>
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# include <IO/WriteBufferFromHTTPServerResponse.h>
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# include <IO/WriteHelpers.h>
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# include <Parsers/ParserQueryWithOutput.h>
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# include <Parsers/parseQuery.h>
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# include <Poco/Data/ODBC/ODBCException.h>
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# include <Poco/Data/ODBC/SessionImpl.h>
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# include <Poco/Data/ODBC/Utility.h>
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# include <Poco/Net/HTMLForm.h>
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# include <Poco/Net/HTTPServerRequest.h>
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# include <Poco/Net/HTTPServerResponse.h>
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# include <Poco/NumberParser.h>
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# include <common/logger_useful.h>
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# include <Common/quoteString.h>
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# include <ext/scope_guard.h>
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# include "getIdentifierQuote.h"
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# include "validateODBCConnectionString.h"
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# define POCO_SQL_ODBC_CLASS Poco::Data::ODBC
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namespace DB
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{
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namespace
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{
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DataTypePtr getDataType(SQLSMALLINT type)
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{
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const auto & factory = DataTypeFactory::instance();
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switch (type)
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{
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case SQL_TINYINT:
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return factory.get("Int8");
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case SQL_INTEGER:
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return factory.get("Int32");
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case SQL_SMALLINT:
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return factory.get("Int16");
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case SQL_BIGINT:
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return factory.get("Int64");
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case SQL_FLOAT:
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return factory.get("Float64");
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case SQL_REAL:
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return factory.get("Float32");
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case SQL_DOUBLE:
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return factory.get("Float64");
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case SQL_DATETIME:
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return factory.get("DateTime");
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case SQL_TYPE_TIMESTAMP:
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return factory.get("DateTime");
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case SQL_TYPE_DATE:
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return factory.get("Date");
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default:
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return factory.get("String");
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}
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}
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}
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void ODBCColumnsInfoHandler::handleRequest(Poco::Net::HTTPServerRequest & request, Poco::Net::HTTPServerResponse & response)
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{
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Poco::Net::HTMLForm params(request, request.stream());
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LOG_TRACE(log, "Request URI: {}", request.getURI());
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auto process_error = [&response, this](const std::string & message)
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{
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response.setStatusAndReason(Poco::Net::HTTPResponse::HTTP_INTERNAL_SERVER_ERROR);
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if (!response.sent())
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response.send() << message << std::endl;
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LOG_WARNING(log, message);
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};
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if (!params.has("table"))
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{
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process_error("No 'table' param in request URL");
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return;
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}
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if (!params.has("connection_string"))
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{
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process_error("No 'connection_string' in request URL");
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return;
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}
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std::string schema_name;
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std::string table_name = params.get("table");
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std::string connection_string = params.get("connection_string");
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if (params.has("schema"))
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{
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schema_name = params.get("schema");
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LOG_TRACE(log, "Will fetch info for table '{}'", schema_name + "." + table_name);
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}
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else
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LOG_TRACE(log, "Will fetch info for table '{}'", table_name);
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LOG_TRACE(log, "Got connection str '{}'", connection_string);
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try
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{
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const bool external_table_functions_use_nulls = Poco::NumberParser::parseBool(params.get("external_table_functions_use_nulls", "false"));
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POCO_SQL_ODBC_CLASS::SessionImpl session(validateODBCConnectionString(connection_string), DBMS_DEFAULT_CONNECT_TIMEOUT_SEC);
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SQLHDBC hdbc = session.dbc().handle();
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SQLHSTMT hstmt = nullptr;
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if (POCO_SQL_ODBC_CLASS::Utility::isError(SQLAllocStmt(hdbc, &hstmt)))
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throw POCO_SQL_ODBC_CLASS::ODBCException("Could not allocate connection handle.");
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SCOPE_EXIT(SQLFreeStmt(hstmt, SQL_DROP));
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const auto & context_settings = context.getSettingsRef();
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/// TODO Why not do SQLColumns instead?
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std::string name = schema_name.empty() ? backQuoteIfNeed(table_name) : backQuoteIfNeed(schema_name) + "." + backQuoteIfNeed(table_name);
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std::stringstream ss;
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std::string input = "SELECT * FROM " + name + " WHERE 1 = 0";
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ParserQueryWithOutput parser;
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ASTPtr select = parseQuery(parser, input.data(), input.data() + input.size(), "", context_settings.max_query_size, context_settings.max_parser_depth);
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IAST::FormatSettings settings(ss, true);
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settings.always_quote_identifiers = true;
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settings.identifier_quoting_style = getQuotingStyle(hdbc);
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select->format(settings);
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std::string query = ss.str();
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LOG_TRACE(log, "Inferring structure with query '{}'", query);
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if (POCO_SQL_ODBC_CLASS::Utility::isError(POCO_SQL_ODBC_CLASS::SQLPrepare(hstmt, reinterpret_cast<SQLCHAR *>(query.data()), query.size())))
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throw POCO_SQL_ODBC_CLASS::DescriptorException(session.dbc());
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if (POCO_SQL_ODBC_CLASS::Utility::isError(SQLExecute(hstmt)))
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throw POCO_SQL_ODBC_CLASS::StatementException(hstmt);
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SQLSMALLINT cols = 0;
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if (POCO_SQL_ODBC_CLASS::Utility::isError(SQLNumResultCols(hstmt, &cols)))
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throw POCO_SQL_ODBC_CLASS::StatementException(hstmt);
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/// TODO cols not checked
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NamesAndTypesList columns;
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for (SQLSMALLINT ncol = 1; ncol <= cols; ++ncol)
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{
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SQLSMALLINT type = 0;
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/// TODO Why 301?
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SQLCHAR column_name[301];
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SQLSMALLINT is_nullable;
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const auto result = POCO_SQL_ODBC_CLASS::SQLDescribeCol(hstmt, ncol, column_name, sizeof(column_name), nullptr, &type, nullptr, nullptr, &is_nullable);
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if (POCO_SQL_ODBC_CLASS::Utility::isError(result))
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throw POCO_SQL_ODBC_CLASS::StatementException(hstmt);
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auto column_type = getDataType(type);
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if (external_table_functions_use_nulls && is_nullable == SQL_NULLABLE)
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{
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column_type = std::make_shared<DataTypeNullable>(column_type);
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}
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columns.emplace_back(reinterpret_cast<char *>(column_name), std::move(column_type));
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}
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WriteBufferFromHTTPServerResponse out(request, response, keep_alive_timeout);
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writeStringBinary(columns.toString(), out);
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}
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catch (...)
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{
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process_error("Error getting columns from ODBC '" + getCurrentExceptionMessage(false) + "'");
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tryLogCurrentException(log);
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}
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}
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}
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#endif
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