Transaction.h

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#ifndef cetlib_sqlite_Transaction_h
#define cetlib_sqlite_Transaction_h

// ====================================================================
// Transaction
//
// A Transaction object encapsulates a single SQLite transaction. Such
// transactions cannot be nested. Look into using SAVEPOINT if you
// need nesting.
//
// Creating a Transaction begins a transaction in the given db, which
// is to have been already be opened.
//
// A transaction is committed by specifying 'commit()', which can be
// called ONLY ONCE per transaction object.  If 'commit' is not called
// before the Transaction object is destroyed, then the transaction is
// rolled back.
// ====================================================================

struct sqlite3;

namespace cet::sqlite {

  class Transaction {
  public:
    explicit Transaction(sqlite3* db) noexcept(false);
    ~Transaction() noexcept;

    void commit() noexcept(false);

    // Transactions may not be copied or moved.
    Transaction(Transaction const&) = delete;
    Transaction(Transaction&&) = delete;
    Transaction& operator=(Transaction const&) = delete;
    Transaction& operator=(Transaction&&) = delete;

  private:
    sqlite3* db_;
  };

} // cet::sqlite

#endif /* cetlib_sqlite_Transaction_h */

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