be/src/vec/exec/scan/mysql_scanner.h

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#pragma once

#include <stdlib.h>

#include <string>
#include <vector>

#include "common/status.h"

#ifndef __DorisMysql
#define __DorisMysql void
#endif

#ifndef __DorisMysqlRes
#define __DorisMysqlRes void
#endif

namespace doris::vectorized {

struct MysqlScannerParam {
    std::string host;
    std::string port;
    std::string user;
    std::string passwd;
    std::string db;
    std::string charset;
    unsigned long client_flag;
    MysqlScannerParam() : client_flag(0) {}
};

// Mysql Scanner for scan data from mysql
class MysqlScanner {
public:
    MysqlScanner(const MysqlScannerParam& param);
    ~MysqlScanner();

    Status open();
    Status query(const std::string& query);

    // query for DORIS
    Status query(const std::string& table, const std::vector<std::string>& fields,
                 const std::vector<std::string>& filters, const uint64_t limit);
    Status get_next_row(char*** buf, unsigned long** lengths, bool* eos);

    int field_num() const { return _field_num; }

private:
    Status _error_status(const std::string& prefix);

    const MysqlScannerParam& _my_param;
    __DorisMysql* _my_conn = nullptr;
    __DorisMysqlRes* _my_result = nullptr;
    std::string _sql_str;
    bool _is_open;
    int _field_num;
};

} // namespace doris::vectorized