PostgreSQLConnection.h

/*
╔══════════════════════════════════════════════════════════════════════════════╗
║                        SIMPLY POWERFUL TOOLKIT (SPTK)                        ║
╟──────────────────────────────────────────────────────────────────────────────╢
║  copyright            © 1999-2022 Alexey Parshin. All rights reserved.       ║
║  email                alexeyp@gmail.com                                      ║
╚══════════════════════════════════════════════════════════════════════════════╝
┌──────────────────────────────────────────────────────────────────────────────┐
│   This library is free software; you can redistribute it and/or modify it    │
│   under the terms of the GNU Library General Public License as published by  │
│   the Free Software Foundation; either version 2 of the License, or (at your │
│   option) any later version.                                                 │
│                                                                              │
│   This library is distributed in the hope that it will be useful, but        │
│   WITHOUT ANY WARRANTY; without even the implied warranty of                 │
│   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library   │
│   General Public License for more details.                                   │
│                                                                              │
│   You should have received a copy of the GNU Library General Public License  │
│   along with this library; if not, write to the Free Software Foundation,    │
│   Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.               │
│                                                                              │
│   Please report all bugs and problems to alexeyp@gmail.com.                  │
└──────────────────────────────────────────────────────────────────────────────┘
*/
 
#pragma once
 
#include <mutex>
#include <sptk5/db/PoolDatabaseConnection.h>
 
#ifdef HAVE_POSTGRESQL
 
#include <libpq-fe.h>
 
#ifndef _WIN32
 
#include <list>
#include <netinet/in.h>
 
#endif
 
namespace sptk {
 
class PostgreSQLStatement;
 
class SP_EXPORT PostgreSQLConnection
    : public PoolDatabaseConnection
{
    friend class Query;
 
public:
    enum class TimestampFormat : uint8_t
    {
        UNKNOWN,
        DOUBLE,
        INT64
    };
 
    PGconn* connection()
    {
        return m_connect;
    }
 
    static void PostgreTypeToCType(PostgreSQLDataType postgreType, VariantDataType& dataType);
 
    static void CTypeToPostgreType(VariantDataType dataType, PostgreSQLDataType& postgreType, const String& paramName);
 
    void _openDatabase(const String& connectionString) override;
 
    void _bulkInsert(const String& tableName, const Strings& columnNames,
                     const std::vector<VariantVector>& data) override;
 
    void _executeBatchSQL(const sptk::Strings& batchSQL, Strings* errors) override;
 
    explicit PostgreSQLConnection(const String& connectionString = "", std::chrono::seconds connectTimeout = std::chrono::seconds(60));
 
    ~PostgreSQLConnection() override;
 
    String nativeConnectionString() const override;
 
    void closeDatabase() override;
 
    bool active() const override;
 
    DBHandle handle() const override;
 
    String driverDescription() const override;
 
    void objectList(DatabaseObjectType objectType, Strings& objects) override;
 
    static std::map<PostgreSQLConnection*, std::shared_ptr<PostgreSQLConnection>> s_postgresqlConnections;
 
protected:
    static Strings extractStatements(const Strings& sqlBatch);
 
    void driverBeginTransaction() override;
 
    void driverEndTransaction(bool commit) override;
 
    // These methods implement the actions requested by Query
 
    String queryError(const Query* query) const override;
 
    void queryAllocStmt(Query* query) override;
 
    void queryFreeStmt(Query* query) override;
 
    void queryCloseStmt(Query* query) override;
 
    void queryPrepare(Query* query) override;
 
    void queryExecute(Query* query) override
    {
        // Not needed for PG driver
    }
 
    int queryColCount(Query* query) override;
 
    void queryBindParameters(Query* query) override;
 
    void queryOpen(Query* query) override;
 
    void queryFetch(Query* query) override;
 
    String paramMark(unsigned paramIndex) override;
 
    TimestampFormat timestampsFormat() const
    {
        return m_timestampsFormat;
    }
 
    void queryColAttributes(Query* query, int16_t column, int16_t descType, int32_t& value) override;
    void queryColAttributes(Query* query, int16_t column, int16_t descType, char* buff, int len) override;
    void queryExecDirect(const Query* query);
 
private:
    mutable std::mutex m_mutex;                                    
    PGconn* m_connect {nullptr};                                   
    TimestampFormat m_timestampsFormat {TimestampFormat::UNKNOWN}; 
};
 
} // namespace sptk
 
#endif
 
extern "C" {
SP_DRIVER_EXPORT void* postgresql_create_connection(const char* connectionString, size_t connectionTimeoutSeconds);
SP_DRIVER_EXPORT void postgresql_destroy_connection(void* connection);
}