mydb.cpp

来自「linux 下的源代码分析阅读器 red hat公司新版」· C++ 代码 · 共 64 行

#include "MyDb.hpp"

// File: MyDb.cpp

// Class constructor. Requires a path to the location
// where the database is located, and a database name
MyDb::MyDb(std::string &path, std::string &dbName,
           bool isSecondary)
    : db_(NULL, 0),               // Instantiate Db object
      dbFileName_(path + dbName), // Database file name
      cFlags_(DB_CREATE)          // If the database doesn't yet exist,
                                  // allow it to be created.
{
    try
    {
        // Redirect debugging information to std::cerr
        db_.set_error_stream(&std::cerr);

        // If this is a secondary database, support
        // sorted duplicates
        if (isSecondary)
            db_.set_flags(DB_DUPSORT);

        // Open the database
        db_.open(NULL, dbFileName_.c_str(), NULL, DB_BTREE, cFlags_, 0);
    }
    // DbException is not a subclass of std::exception, so we
    // need to catch them both.
    catch(DbException &e)
    {
        std::cerr << "Error opening database: " << dbFileName_ << "\n";
        std::cerr << e.what() << std::endl;
    }
    catch(std::exception &e)
    {
        std::cerr << "Error opening database: " << dbFileName_ << "\n";
        std::cerr << e.what() << std::endl;
    }
}

// Private member used to close a database. Called from the class
// destructor.
void
MyDb::close()
{
    // Close the db
    try
    {
        db_.close(0);
        std::cout << "Database " << dbFileName_
                  << " is closed." << std::endl;
    }
    catch(DbException &e)
    {
            std::cerr << "Error closing database: " << dbFileName_ << "\n";
            std::cerr << e.what() << std::endl;
    }
    catch(std::exception &e)
    {
        std::cerr << "Error closing database: " << dbFileName_ << "\n";
        std::cerr << e.what() << std::endl;
    }
}