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173 lines
6.1 KiB
C++
173 lines
6.1 KiB
C++
#include "ColumnInfoHandler.h"
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#include "getIdentifierQuote.h"
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#if USE_POCO_SQLODBC || USE_POCO_DATAODBC
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#if USE_POCO_SQLODBC
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#include <Poco/SQL/ODBC/ODBCException.h> // Y_IGNORE
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#include <Poco/SQL/ODBC/SessionImpl.h> // Y_IGNORE
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#include <Poco/SQL/ODBC/Utility.h> // Y_IGNORE
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#define POCO_SQL_ODBC_CLASS Poco::SQL::ODBC
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#endif
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#if USE_POCO_DATAODBC
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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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#define POCO_SQL_ODBC_CLASS Poco::Data::ODBC
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#endif
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#include <Poco/Net/HTTPServerRequest.h>
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#include <Poco/Net/HTTPServerResponse.h>
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#include <Poco/Net/HTMLForm.h>
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#include <DataTypes/DataTypeFactory.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 <common/logger_useful.h>
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#include <ext/scope_guard.h>
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#include "validateODBCConnectionString.h"
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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_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_FLOAT:
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return factory.get("Float32");
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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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namespace ErrorCodes
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{
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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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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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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/// TODO Why not do SQLColumns instead?
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std::string name = schema_name.empty() ? table_name : schema_name + "." + 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(), "", 0);
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IAST::FormatSettings settings(ss, true);
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settings.always_quote_identifiers = true;
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auto identifier_quote = getIdentifierQuote(hdbc);
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if (identifier_quote.length() == 0)
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settings.identifier_quoting_style = IdentifierQuotingStyle::None;
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else if (identifier_quote[0] == '`')
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settings.identifier_quoting_style = IdentifierQuotingStyle::Backticks;
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else if (identifier_quote[0] == '"')
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settings.identifier_quoting_style = IdentifierQuotingStyle::DoubleQuotes;
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else
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throw Exception("Can not map quote identifier '" + identifier_quote + "' to IdentifierQuotingStyle value", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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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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/// TODO Result is not checked.
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POCO_SQL_ODBC_CLASS::SQLDescribeCol(hstmt, ncol, column_name, sizeof(column_name), nullptr, &type, nullptr, nullptr, nullptr);
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columns.emplace_back(reinterpret_cast<char *>(column_name), getDataType(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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