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128 lines
3.6 KiB
C++
128 lines
3.6 KiB
C++
#include "config.h"
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#if USE_MYSQL
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#include <Storages/StorageMySQL.h>
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#include <Processors/Sources/MySQLSource.h>
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#include <Interpreters/Context.h>
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#include <Parsers/ASTFunction.h>
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#include <Storages/MySQL/MySQLSettings.h>
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#include <Storages/MySQL/MySQLHelpers.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 <Common/parseAddress.h>
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#include <Common/quoteString.h>
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#include "registerTableFunctions.h"
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#include <Databases/MySQL/DatabaseMySQL.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 LOGICAL_ERROR;
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}
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namespace
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{
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/* mysql ('host:port', database, table, user, password) - creates a temporary StorageMySQL.
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* The structure of the table is taken from the mysql query DESCRIBE table.
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* If there is no such table, an exception is thrown.
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*/
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class TableFunctionMySQL : public ITableFunction
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{
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public:
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static constexpr auto name = "mysql";
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std::string getName() const override
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{
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return name;
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}
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private:
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StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns, bool is_insert_query) const override;
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const char * getStorageTypeName() const override { return "MySQL"; }
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ColumnsDescription getActualTableStructure(ContextPtr context, bool is_insert_query) const override;
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void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
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mutable std::optional<mysqlxx::PoolWithFailover> pool;
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std::optional<StorageMySQL::Configuration> configuration;
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};
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void TableFunctionMySQL::parseArguments(const ASTPtr & ast_function, ContextPtr context)
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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(ErrorCodes::LOGICAL_ERROR, "Table function 'mysql' must have arguments.");
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auto & args = args_func.arguments->children;
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MySQLSettings mysql_settings;
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const auto & settings = context->getSettingsRef();
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mysql_settings.connect_timeout = settings.external_storage_connect_timeout_sec;
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mysql_settings.read_write_timeout = settings.external_storage_rw_timeout_sec;
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for (auto * it = args.begin(); it != args.end(); ++it)
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{
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const ASTSetQuery * settings_ast = (*it)->as<ASTSetQuery>();
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if (settings_ast)
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{
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mysql_settings.loadFromQuery(*settings_ast);
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args.erase(it);
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break;
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}
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}
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configuration = StorageMySQL::getConfiguration(args, context, mysql_settings);
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pool.emplace(createMySQLPoolWithFailover(*configuration, mysql_settings));
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}
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ColumnsDescription TableFunctionMySQL::getActualTableStructure(ContextPtr context, bool /*is_insert_query*/) const
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{
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return StorageMySQL::getTableStructureFromData(*pool, configuration->database, configuration->table, context);
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}
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StoragePtr TableFunctionMySQL::executeImpl(
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const ASTPtr & /*ast_function*/,
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ContextPtr context,
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const std::string & table_name,
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ColumnsDescription cached_columns,
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bool /*is_insert_query*/) const
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{
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auto res = std::make_shared<StorageMySQL>(
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StorageID(getDatabaseName(), table_name),
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std::move(*pool),
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configuration->database,
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configuration->table,
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configuration->replace_query,
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configuration->on_duplicate_clause,
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cached_columns,
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ConstraintsDescription{},
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String{},
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context,
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MySQLSettings{});
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pool.reset();
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res->startup();
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return res;
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}
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}
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void registerTableFunctionMySQL(TableFunctionFactory & factory)
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{
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factory.registerFunction<TableFunctionMySQL>();
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}
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}
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#endif
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