kima2/src/core/database.cpp

#include "database.h"

#include <filesystem>
#include <iostream>
#include <stdexcept>
#include <vector>

#include "boost/date_time/posix_time/posix_time.hpp"

Database::Database(const std::string &dbname)
{
    dbname_ = dbname;
    init();
}

Database::Database()
{
    namespace fs = std::filesystem;

#if defined(__linux__) || defined(__APPLE__)
    fs::path dbpath = fs::path(std::getenv("HOME")) / ".local/share/kima2";
#elif defined(_WIN64) || defined(_WIN32)
    fs::path dbpath = fs::path(std::getenv("LOCALAPPDATA")) / "kima2";
#else
    throw std::runtime_error("Platform not supported.");
#endif

    if (!fs::exists(dbpath)) {
        try {
            fs::create_directories(dbpath);
        } catch (fs::filesystem_error &err) {
            throw err;
        }
    }
    dbpath /= "kima2.db";
    dbname_ = dbpath.string();
    init();
}

void Database::newDb()
{
    namespace fs = std::filesystem;

    sqlite3_close(db_);

    fs::path sourcePath = dbname_;
    fs::path destPath = sourcePath.parent_path() / sourcePath.stem();
    destPath += std::string("_") +=
        boost::posix_time::to_iso_string(boost::posix_time::second_clock::local_time()) += ".db";

    fs::copy_file(sourcePath, destPath, fs::copy_options::overwrite_existing);

    fs::remove(sourcePath);

    init();
}

Database::~Database() { sqlite3_close(db_); }

void Database::exec(const std::string &sql)
{
    char *errMsg;
    const int errCode = sqlite3_exec(db_, sql.c_str(), nullptr, nullptr, &errMsg);
    if (errCode) {
        std::string errMsgString(errMsg); // Make a C++ string of the errMsg, so that we can call
                                          // sqlite3_free() before throwing the exception
        sqlite3_free(errMsg);
        throw std::runtime_error("Error in SQL execution: " + errMsgString);
    }
}

void Database::createNew()
{
    std::vector<std::string> sqlStrings{};

    std::string sqlCreateKima2{"CREATE TABLE IF NOT EXISTS kima2 ("
                               "version INTEGER NOT NULL);"
                               "INSERT INTO kima2 (version) VALUES (3);"};
    sqlStrings.push_back(sqlCreateKima2);
    std::string sqlCreateSellers{"CREATE TABLE IF NOT EXISTS sellers ("
                                 "seller_no INTEGER PRIMARY KEY NOT NULL, "
                                 "first_name TEXT, "
                                 "last_name TEXT, "
                                 "num_offered_articles INTEGER, "
                                 "UNIQUE (seller_no)"
                                 ");"};
    sqlStrings.push_back(sqlCreateSellers);
    std::string sqlCreateArticles{
        "CREATE TABLE IF NOT EXISTS articles ("
        "id TEXT PRIMARY KEY NOT NULL, "
        "seller_no TEXT NOT NULL, "
        "source_no INTEGER NOT NULL, "
        "article_no INTEGER NOT NULL, "
        "description TEXT, "
        "price INTEGER NOT NULL, "
        "UNIQUE (source_no, article_no), "
        "FOREIGN KEY (seller_no) REFERENCES sellers(seller_no) ON DELETE CASCADE, "
        "CHECK (article_no BETWEEN 0 AND 99999)"
        ");"};
    sqlStrings.push_back(sqlCreateArticles);
    std::string sqlCreateSales{"CREATE TABLE IF NOT EXISTS sales ("
                               " id TEXT PRIMARY KEY NOT NULL,"
                               " source_no INTEGER NOT NULL,"
                               " sold_at TEXT"
                               ");"};
    sqlStrings.push_back(sqlCreateSales);
    std::string sqlCreateSalesItems{
        "CREATE TABLE IF NOT EXISTS sales_items("
        " sale_id TEXT NOT NULL,"
        " article_id TEXT NOT NULL,"
        " FOREIGN KEY (sale_id) REFERENCES sales(id) ON DELETE CASCADE,"
        " FOREIGN KEY (article_id) REFERENCES articles(id) ON DELETE CASCADE"
        ");"};
    sqlStrings.push_back(sqlCreateSalesItems);

    std::string sqlInitialEntries{
        "INSERT OR IGNORE INTO sellers (seller_no, first_name, last_name, "
        "num_offered_articles) VALUES "
        "(0, 'Sonderkonto', 'Sonderkonto', 0)"};
    sqlStrings.push_back(sqlInitialEntries);

    beginTransaction();
    for (const auto &sql : sqlStrings) {
        exec(sql);
    }
    endTransaction();
}

void Database::updateDbToVer2()
{
    beginTransaction();
    exec("INSERT OR IGNORE INTO sellers (seller_no, first_name, last_name, "
         "num_offered_articles) VALUES "
         "(0, 'Sonderkonto', 'Sonderkonto', 0)");
    exec("UPDATE kima2 SET version = 3");
    endTransaction();
}

void Database::updateDbToVer3() { newDb(); }

void Database::init()
{
    const int errCode = sqlite3_open(dbname_.c_str(), &db_);
    if (errCode) {
        throw std::runtime_error("Could not open database file.");
    }

    // sqlite3_db_config(db_, SQLITE_DBCONFIG_ENABLE_FKEY);
    exec("PRAGMA foreign_keys = ON;");

    int version = getVersion();

    switch (version) {
    case 0:
        createNew();
        initResult_ = InitResult::OK;
        break;
    case 1:
        updateDbToVer3();
        initResult_ = InitResult::OUTDATED_REPLACED;
        break;
    case 2:
        updateDbToVer3();
        initResult_ = InitResult::OUTDATED_REPLACED;
        break;
    default:
        // Do nothing because we are up-to-date.
        initResult_ = InitResult::OK;
        break;
    }
}

int Database::getVersion()
{
    int retCode{};
    sqlite3_stmt *stmt;

    // Check if there's already a kima2 table available.
    // If not, return version == 0.
    retCode = sqlite3_prepare_v2(
        db_, "SELECT count(*) FROM sqlite_master WHERE type='table' AND name='kima2';", -1, &stmt,
        nullptr);
    if (retCode != SQLITE_OK)
        throw std::string(sqlite3_errmsg(db_));
    retCode = sqlite3_step(stmt);
    if (retCode != SQLITE_ROW && retCode != SQLITE_DONE) {
        std::string errMsg(sqlite3_errmsg(db_));
        sqlite3_finalize(stmt);
        throw errMsg;
    } else if (retCode != SQLITE_DONE) {
        int count = sqlite3_column_int(stmt, 0);
        sqlite3_finalize(stmt);
        if (count == 0)
            return 0; // no kima2 table, so version is 0
    }

    // Now that we know that the kima2 table is present, read and return the schema version.
    retCode = sqlite3_prepare_v2(db_, "SELECT version FROM kima2", -1, &stmt, nullptr);
    if (retCode != SQLITE_OK)
        throw std::string(sqlite3_errmsg(db_));

    retCode = sqlite3_step(stmt);

    if (retCode != SQLITE_ROW && retCode != SQLITE_DONE) {
        std::string errMsg(sqlite3_errmsg(db_));
        sqlite3_finalize(stmt);
        throw errMsg;
    } else if (retCode == SQLITE_DONE) {
        sqlite3_finalize(stmt);
        return 0; // no version entry, so version is 0
    }

    int version = sqlite3_column_int(stmt, 0);
    sqlite3_finalize(stmt);

    return version;
}

void Database::beginTransaction() { exec("BEGIN TRANSACTION"); }

void Database::endTransaction() { exec("END TRANSACTION"); }

unsigned int Database::storeSellers(std::vector<std::unique_ptr<Seller>> &sellers, bool onlyDelete)
{
    int retCode{};
    int count{};
    sqlite3_stmt *stmt;

    beginTransaction();

    for (auto &seller : sellers) {
        if (seller->getState() == Seller::State::NEW && !onlyDelete) {
            retCode = sqlite3_prepare_v2(
                db_,
                "INSERT INTO sellers"
                " (seller_no, first_name, last_name, num_offered_articles)"
                " VALUES (:seller_no, :first_name, :last_name, :num_offered_articles)",
                -1, &stmt, nullptr);

            if (retCode != SQLITE_OK)
                throw std::runtime_error(sqlite3_errmsg(db_));

            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_no"),
                             seller->getSellerNo());
            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":first_name"),
                              seller->getFirstName().c_str(), -1, SQLITE_TRANSIENT);
            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":last_name"),
                              seller->getLastName().c_str(), -1, SQLITE_TRANSIENT);
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":num_offered_articles"),
                             seller->numArticlesOffered());

            retCode = sqlite3_step(stmt);

            if (retCode != SQLITE_DONE) {

                std::string errMsg(sqlite3_errmsg(db_));
                sqlite3_finalize(stmt);
                throw std::runtime_error(errMsg);
            }
            ++count;
            sqlite3_finalize(stmt);
        } else if (seller->getState() == Seller::State::UPDATE && !onlyDelete) {
            retCode = sqlite3_prepare_v2(
                db_,
                "UPDATE sellers SET"
                " seller_no = :seller_no, first_name = :first_name,"
                " last_name = :last_name, num_offered_articles = :num_offered_articles"
                " WHERE seller_no = :id",
                -1, &stmt, nullptr);

            if (retCode != SQLITE_OK)
                throw std::runtime_error(sqlite3_errmsg(db_));

            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":id"), seller->getId());
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_no"),
                             seller->getSellerNo());
            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":first_name"),
                              seller->getFirstName().c_str(), -1, SQLITE_TRANSIENT);
            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":last_name"),
                              seller->getLastName().c_str(), -1, SQLITE_TRANSIENT);
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":num_offered_articles"),
                             seller->numArticlesOffered());

            retCode = sqlite3_step(stmt);

            if (retCode != SQLITE_DONE) {

                std::string errMsg(sqlite3_errmsg(db_));
                sqlite3_finalize(stmt);
                throw std::runtime_error(errMsg);
            }
            ++count;
            sqlite3_finalize(stmt);
        } else if (seller->getState() == Seller::State::DELETE) {
            count += static_cast<int>(seller->getArticles(false).size());

            retCode = sqlite3_prepare_v2(db_, "DELETE FROM sellers WHERE seller_no = :id", -1,
                                         &stmt, nullptr);

            if (retCode != SQLITE_OK)
                throw std::runtime_error(sqlite3_errmsg(db_));

            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":id"), seller->getId());

            retCode = sqlite3_step(stmt);

            if (retCode != SQLITE_DONE) {

                std::string errMsg(sqlite3_errmsg(db_));
                sqlite3_finalize(stmt);
                throw std::runtime_error(errMsg);
            }
            ++count;
            sqlite3_finalize(stmt);
        }

        if (seller->getState() != Seller::State::DELETE) {
            count += storeArticles(seller->getArticles(false));
        }
    }

    endTransaction();

    // Everything went fine, so we can now update our objects
    sellers.erase(std::remove_if(sellers.begin(), sellers.end(),
                                 [](const std::unique_ptr<Seller> &seller) {
                                     return (seller->getState() == Seller::State::DELETE);
                                 }),
                  sellers.end());

    for (auto &seller : sellers) {
        seller->cleanupArticles();
        seller->setState(Seller::State::OK);
    }

    return count;
}

unsigned int Database::storeArticles(std::vector<Article *> articles)
{
    int retCode{};
    int count{};
    sqlite3_stmt *stmt;

    for (auto &article : articles) {
        if (article->getState() == Article::State::NEW) {
            retCode = sqlite3_prepare_v2(
                db_,
                "INSERT INTO articles"
                " (id, seller_no, source_no, article_no, description, price)"
                " VALUES (:uuid, :seller_id, :source_no, :article_no, :desc, :price)",
                -1, &stmt, nullptr);

            if (retCode != SQLITE_OK)
                throw std::runtime_error(sqlite3_errmsg(db_));

            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":uuid"),
                              boost::uuids::to_string(article->getUuid()).c_str(), -1,
                              SQLITE_TRANSIENT);
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_id"),
                             article->getSeller()->getId());
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":source_no"),
                             article->getSourceNo());
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":article_no"),
                             article->getArticleNo());
            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":desc"),
                              article->getDescription().c_str(), -1, SQLITE_TRANSIENT);
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":price"),
                             article->getPrice());

            retCode = sqlite3_step(stmt);

            if (retCode != SQLITE_DONE) {

                std::string errMsg(sqlite3_errmsg(db_));
                sqlite3_finalize(stmt);
                throw std::runtime_error(errMsg);
            }
            ++count;
            sqlite3_finalize(stmt);
        } else if (article->getState() == Article::State::UPDATE) {
            retCode = sqlite3_prepare_v2(
                db_,
                "UPDATE articles SET"
                " seller_no = :seller_id, source_no = :source_no, article_no = :article_no,"
                " description = :desc, price = :price"
                " WHERE id = :uuid",
                -1, &stmt, nullptr);

            if (retCode != SQLITE_OK)
                throw std::runtime_error(sqlite3_errmsg(db_));

            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":uuid"),
                              boost::uuids::to_string(article->getUuid()).c_str(), -1,
                              SQLITE_TRANSIENT);
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_id"),
                             article->getSeller()->getId());
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":source_no"),
                             article->getSourceNo());
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":article_no"),
                             article->getArticleNo());
            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":desc"),
                              article->getDescription().c_str(), -1, SQLITE_TRANSIENT);
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":price"),
                             article->getPrice());

            retCode = sqlite3_step(stmt);

            if (retCode != SQLITE_DONE) {

                std::string errMsg(sqlite3_errmsg(db_));
                sqlite3_finalize(stmt);
                throw std::runtime_error(errMsg);
            }
            ++count;
            sqlite3_finalize(stmt);
        } else if (article->getState() == Article::State::DELETE) {
            retCode = sqlite3_prepare_v2(db_, "DELETE FROM articles WHERE id = :uuid", -1, &stmt,
                                         nullptr);

            if (retCode != SQLITE_OK)
                throw std::runtime_error(sqlite3_errmsg(db_));

            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":uuid"),
                              boost::uuids::to_string(article->getUuid()).c_str(), -1,
                              SQLITE_TRANSIENT);

            retCode = sqlite3_step(stmt);

            if (retCode != SQLITE_DONE) {

                std::string errMsg(sqlite3_errmsg(db_));
                sqlite3_finalize(stmt);
                throw std::runtime_error(errMsg);
            }
            ++count;
            sqlite3_finalize(stmt);
        }
    }

    return count;
}

unsigned int Database::storeSales(std::vector<std::unique_ptr<Sale>> &sales)
{
    int retCode{};
    int count{};
    sqlite3_stmt *stmt;

    if (sales.size() == 0)
        return 0;

    beginTransaction();

    for (auto &sale : sales) {
        if (sale->getState() == Sale::State::NEW) {
            retCode = sqlite3_prepare_v2(db_,
                                         "INSERT INTO sales"
                                         " (id, source_no, sold_at)"
                                         " VALUES (:uuid, :source_no, :sold_at)",
                                         -1, &stmt, nullptr);

            if (retCode != SQLITE_OK)
                throw std::runtime_error(sqlite3_errmsg(db_));

            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":uuid"),
                              boost::uuids::to_string(sale->getUuid()).c_str(), -1,
                              SQLITE_TRANSIENT);
            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":source_no"),
                             sale->getSourceNo());
            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":sold_at"),
                              sale->getTimestamp().c_str(), -1, SQLITE_TRANSIENT);

            retCode = sqlite3_step(stmt);

            if (retCode != SQLITE_DONE) {

                std::string errMsg(sqlite3_errmsg(db_));
                sqlite3_finalize(stmt);
                throw std::runtime_error(errMsg);
            }
            ++count;
            sqlite3_finalize(stmt);

            for (const auto &article : sale->getArticles()) {
                retCode = sqlite3_prepare_v2(db_,
                                             "INSERT INTO sales_items"
                                             " (sale_id, article_id)"
                                             " VALUES (:sale_id, :article_id)",
                                             -1, &stmt, nullptr);

                if (retCode != SQLITE_OK)
                    throw std::runtime_error(sqlite3_errmsg(db_));

                sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":sale_id"),
                                  sale->getUuidAsString().c_str(), -1, SQLITE_TRANSIENT);
                sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":article_id"),
                                  article->getUuidAsString().c_str(), -1, SQLITE_TRANSIENT);

                retCode = sqlite3_step(stmt);

                if (retCode != SQLITE_DONE) {

                    std::string errMsg(sqlite3_errmsg(db_));
                    sqlite3_finalize(stmt);
                    throw std::runtime_error(errMsg);
                }
                sqlite3_finalize(stmt);
            }
        } else if (sale->getState() == Sale::State::DELETE) {
            retCode =
                sqlite3_prepare_v2(db_, "DELETE FROM sales WHERE id = :uuid", -1, &stmt, nullptr);

            if (retCode != SQLITE_OK)
                throw std::runtime_error(sqlite3_errmsg(db_));

            sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":uuid"),
                              sale->getUuidAsString().c_str(), -1, SQLITE_TRANSIENT);

            retCode = sqlite3_step(stmt);

            if (retCode != SQLITE_DONE) {

                std::string errMsg(sqlite3_errmsg(db_));
                sqlite3_finalize(stmt);
                throw std::runtime_error(errMsg);
            }
            ++count;
            sqlite3_finalize(stmt);
        }
    }

    endTransaction();

    // Everything went fine, so we can now update our objects
    sales.erase(
        std::remove_if(sales.begin(), sales.end(),
                       [](const auto &sale) { return (sale->getState() == Sale::State::DELETE); }),
        sales.end());

    for (auto &sale : sales) {
        sale->setState(Sale::State::OK);
    }

    return count;
}

unsigned int Database::loadSellers(std::vector<std::unique_ptr<Seller>> &sellers)
{
    int retCode{};
    int count{};
    sqlite3_stmt *stmt;

    retCode = sqlite3_prepare_v2(db_,
                                 "SELECT seller_no, first_name, last_name, "
                                 "num_offered_articles FROM sellers ORDER BY seller_no",
                                 -1, &stmt, nullptr);
    if (retCode != SQLITE_OK)
        throw std::runtime_error(sqlite3_errmsg(db_));

    retCode = sqlite3_step(stmt);

    sellers.clear();

    while (retCode != SQLITE_DONE) {
        ++count;
        auto seller = std::make_unique<Seller>();
        seller->setSellerNo(sqlite3_column_int(stmt, 0));
        seller->setFirstName(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 1)));
        seller->setLastName(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 2)));
        seller->setNumArticlesOffered(sqlite3_column_int(stmt, 3));
        seller->setState(Seller::State::OK);
        sellers.push_back(std::move(seller));

        retCode = sqlite3_step(stmt);
    }

    sqlite3_finalize(stmt);

    for (auto &seller : sellers) {
        retCode = sqlite3_prepare_v2(db_,
                                     "SELECT id, source_no, article_no, description, price"
                                     " FROM articles"
                                     " WHERE seller_no = :seller_id"
                                     " ORDER BY article_no",
                                     -1, &stmt, nullptr);
        if (retCode != SQLITE_OK)
            throw std::runtime_error(sqlite3_errmsg(db_));

        sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_id"), seller->getId());

        retCode = sqlite3_step(stmt);

        while (retCode != SQLITE_DONE) {
            ++count;
            auto article = std::make_unique<Article>();
            article->setUuidFromString(
                reinterpret_cast<const char *>(sqlite3_column_text(stmt, 0)));
            article->setSeller(seller.get());
            article->setSourceNo(sqlite3_column_int(stmt, 1));
            article->setArticleNo(sqlite3_column_int(stmt, 2));
            article->setDescription(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 3)));
            article->setPrice(sqlite3_column_int(stmt, 4));
            article->setState(Article::State::OK);

            seller->addArticle(std::move(article));

            retCode = sqlite3_step(stmt);
        }

        sqlite3_finalize(stmt);
    }

    return count;
}

unsigned int Database::loadSales(std::vector<std::unique_ptr<Sale>> &sales,
                                 std::vector<std::unique_ptr<Seller>> &sellers)
{
    int retCode{};
    int count{};
    sqlite3_stmt *stmt;

    retCode = sqlite3_prepare_v2(db_,
                                 "SELECT id, source_no, sold_at"
                                 " FROM sales ORDER BY sold_at DESC",
                                 -1, &stmt, nullptr);
    if (retCode != SQLITE_OK)
        throw std::runtime_error(sqlite3_errmsg(db_));

    retCode = sqlite3_step(stmt);

    sales.clear();

    std::map<std::string, Sale *> saleMap;
    while (retCode != SQLITE_DONE) {
        ++count;
        auto sale = std::make_unique<Sale>();
        sale->setUuidFromString(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 0)));
        sale->setSourceNo(sqlite3_column_int(stmt, 1));
        sale->setTimestamp(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 2)));
        sale->setState(Sale::State::OK);
        saleMap.insert(std::make_pair(sale->getUuidAsString(), sale.get()));
        sales.push_back(std::move(sale));

        retCode = sqlite3_step(stmt);
    }

    sqlite3_finalize(stmt);

    std::map<std::string, Article *> artMap;
    for (const auto &seller : sellers) {
        for (const auto article : seller->getArticles(false)) {
            artMap.insert(std::make_pair(article->getUuidAsString(), article));
        }
    }

    retCode = sqlite3_prepare_v2(db_,
                                 "SELECT sale_id, article_id"
                                 " FROM sales_items",
                                 -1, &stmt, nullptr);
    if (retCode != SQLITE_OK)
        throw std::runtime_error(sqlite3_errmsg(db_));

    retCode = sqlite3_step(stmt);

    while (retCode != SQLITE_DONE) {
        saleMap[reinterpret_cast<const char *>(sqlite3_column_text(stmt, 0))]->addArticle(
            artMap[reinterpret_cast<const char *>(sqlite3_column_text(stmt, 1))]);

        retCode = sqlite3_step(stmt);
    }

    sqlite3_finalize(stmt);

    return count;
}

void Database::updateCashPointNo(int oldCashPointNo, int newCashPointNo)
{
    int retCode{};
    sqlite3_stmt *stmt;

    // Check if the new no ist already in use
    retCode = sqlite3_prepare_v2(db_, "SELECT COUNT() FROM articles WHERE source_no = :source_no",
                                 -1, &stmt, nullptr);
    if (retCode != SQLITE_OK)
        throw std::string(sqlite3_errmsg(db_));

    sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":source_no"), newCashPointNo);

    retCode = sqlite3_step(stmt);

    int count{};

    if (retCode != SQLITE_ROW) {
        std::string errMsg(sqlite3_errmsg(db_));
        sqlite3_finalize(stmt);
        throw std::runtime_error(errMsg);
    }

    count = sqlite3_column_int(stmt, 0);
    sqlite3_finalize(stmt);

    if (count > 0) {
        throw std::runtime_error("The desired cashpoint no is aleady in use.");
    }

    beginTransaction();
    retCode = sqlite3_prepare_v2(
        db_, "UPDATE articles SET source_no = :new_source_no WHERE source_no = :old_source_no", -1,
        &stmt, nullptr);
    if (retCode != SQLITE_OK)
        throw std::string(sqlite3_errmsg(db_));

    sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":new_source_no"), newCashPointNo);
    sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":old_source_no"), oldCashPointNo);

    retCode = sqlite3_step(stmt);
    if (retCode != SQLITE_DONE) {
        std::string errMsg(sqlite3_errmsg(db_));
        sqlite3_finalize(stmt);
        throw std::runtime_error(errMsg);
    }

    sqlite3_finalize(stmt);

    retCode = sqlite3_prepare_v2(
        db_, "UPDATE sales SET source_no = :new_source_no WHERE source_no = :old_source_no", -1,
        &stmt, nullptr);
    if (retCode != SQLITE_OK)
        throw std::string(sqlite3_errmsg(db_));

    sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":new_source_no"), newCashPointNo);
    sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":old_source_no"), oldCashPointNo);

    retCode = sqlite3_step(stmt);
    if (retCode != SQLITE_DONE) {
        std::string errMsg(sqlite3_errmsg(db_));
        sqlite3_finalize(stmt);
        throw std::runtime_error(errMsg);
    }

    sqlite3_finalize(stmt);

    endTransaction();
}