C# .NET数据层线程安全

我正在处理我的数据层，并采取了一种稍微不同的方法，以下是我的许多数据访问对象之一：

class OwnerDaoImpl : IOwnerDao
{
    private const string ID_COLUMN = "Id";
    private const string USERNAME_COLUMN = "Username";
    private const string PASSWORD_COLUMN = "Password";
    private const string NAME_COLUMN = "Name";
    private const string LAST_NAME_COLUMN = "LastName";
    private const string BIRTHDATE_COLUMN = "BirthDate";
    private const string DNI_COLUMN = "DNI";
    private const string EMAIL_COLUMN = "EMail";
    private const string ADDRESS_COLUMN = "Address";
    private const string PHONE_COLUMN = "PhoneNumber";
    private const string PROFILE_PIC_COLUMN = "ProfilePicture";
    private const string DISTRICT_ID_COLUMN = "DistrictId";

    private const string ID_PARAM = "@id";
    private const string USERNAME_PARAM = "@user";
    private const string PASSWORD_PARAM = "@pass";
    private const string NAME_PARAM = "@name";
    private const string LAST_NAME_PARAM = "@lastName";
    private const string BIRTHDATE_PARAM = "@birthDate";
    private const string DNI_PARAM = "@dni";
    private const string EMAIL_PARAM = "@email";
    private const string ADDRESS_PARAM = "@address";
    private const string PHONE_PARAM = "@phoneNum";
    private const string PROFILE_PIC_PARAM = "@profilePic";
    private const string DISTRICT_ID_PARAM = "@disId";
    private const string ROW_COUNT_PARAM = "@rowCount";

    IDatabase db;
    IDbCommand cmd;
    IDataReader dr;

    public OwnerDaoImpl()
    {
        db = DatabaseFactory.GetSqlDatabase();
    }

    public int Insert(Owner toInsert, IDbConnection conn)
    {
        using (cmd = db.GetStoredProcedureCommand(USP_OWNER_INSERT, conn))
        {
            cmd.Parameters.Add(db.GetParameter(USERNAME_PARAM, DaoUtil.ValueOrDbNull(toInsert.Username)));
            cmd.Parameters.Add(db.GetParameter(PASSWORD_PARAM, DaoUtil.ValueOrDbNull(toInsert.Password)));
            cmd.Parameters.Add(db.GetParameter(NAME_PARAM, DaoUtil.ValueOrDbNull(toInsert.Name)));
            cmd.Parameters.Add(db.GetParameter(LAST_NAME_PARAM, DaoUtil.ValueOrDbNull(toInsert.LastName)));
            cmd.Parameters.Add(db.GetParameter(BIRTHDATE_PARAM, DaoUtil.ValueOrDbNull(toInsert.BirthDate)));
            cmd.Parameters.Add(db.GetParameter(DNI_PARAM, DaoUtil.ValueOrDbNull(toInsert.DNI)));
            cmd.Parameters.Add(db.GetParameter(EMAIL_PARAM, DaoUtil.ValueOrDbNull(toInsert.EMail)));
            cmd.Parameters.Add(db.GetParameter(ADDRESS_PARAM, DaoUtil.ValueOrDbNull(toInsert.Address)));
            cmd.Parameters.Add(db.GetParameter(PHONE_PARAM, DaoUtil.ValueOrDbNull(toInsert.PhoneNumber)));
            cmd.Parameters.Add(db.GetParameter(PROFILE_PIC_PARAM, DaoUtil.ValueOrDbNull(toInsert.ProfilePicture)));
            cmd.Parameters.Add(db.GetParameter(DISTRICT_ID_PARAM, DaoUtil.ValueOrDbNull(toInsert.DistrictId)));
            cmd.Parameters.Add(db.GetOutputParameter(ID_PARAM, SqlDbType.Int));

            cmd.ExecuteNonQuery();

            return (int)((IDataParameter)cmd.Parameters[ID_PARAM]).Value;
        }
    }

    public bool Update(Owner toUpdate, IDbConnection conn)
    {
        using (cmd = db.GetStoredProcedureCommand(USP_OWNER_UPDATE, conn))
        {
            cmd.Parameters.Add(db.GetParameter(ID_PARAM, DaoUtil.ValueOrDbNull(toUpdate.Id)));
            cmd.Parameters.Add(db.GetParameter(USERNAME_PARAM, DaoUtil.ValueOrDbNull(toUpdate.Username)));
            cmd.Parameters.Add(db.GetParameter(PASSWORD_PARAM, DaoUtil.ValueOrDbNull(toUpdate.Password)));
            cmd.Parameters.Add(db.GetParameter(NAME_PARAM, DaoUtil.ValueOrDbNull(toUpdate.Name)));
            cmd.Parameters.Add(db.GetParameter(LAST_NAME_PARAM, DaoUtil.ValueOrDbNull(toUpdate.LastName)));
            cmd.Parameters.Add(db.GetParameter(BIRTHDATE_PARAM, DaoUtil.ValueOrDbNull(toUpdate.BirthDate)));
            cmd.Parameters.Add(db.GetParameter(DNI_PARAM, DaoUtil.ValueOrDbNull(toUpdate.DNI)));
            cmd.Parameters.Add(db.GetParameter(EMAIL_PARAM, DaoUtil.ValueOrDbNull(toUpdate.EMail)));
            cmd.Parameters.Add(db.GetParameter(ADDRESS_PARAM, DaoUtil.ValueOrDbNull(toUpdate.Address)));
            cmd.Parameters.Add(db.GetParameter(PHONE_PARAM, DaoUtil.ValueOrDbNull(toUpdate.PhoneNumber)));
            cmd.Parameters.Add(db.GetParameter(PROFILE_PIC_PARAM, DaoUtil.ValueOrDbNull(toUpdate.ProfilePicture)));
            cmd.Parameters.Add(db.GetParameter(DISTRICT_ID_PARAM, DaoUtil.ValueOrDbNull(toUpdate.DistrictId)));
            cmd.Parameters.Add(db.GetOutputParameter(ROW_COUNT_PARAM, SqlDbType.Int));

            cmd.ExecuteNonQuery();

            return (int)((IDataParameter)cmd.Parameters[ROW_COUNT_PARAM]).Value > 0;
        }
    }

    public bool Delete(object id, IDbConnection conn)
    {
        using (cmd = db.GetStoredProcedureCommand(USP_OWNER_DELETE, conn))
        {
            cmd.Parameters.Add(db.GetParameter(ID_PARAM, DaoUtil.ValueOrDbNull(id)));
            cmd.Parameters.Add(db.GetOutputParameter(ROW_COUNT_PARAM, SqlDbType.Int));

            cmd.ExecuteNonQuery();

            return (int)((IDataParameter)cmd.Parameters[ROW_COUNT_PARAM]).Value > 0;
        }
    }

    public Owner Find(object id, IDbConnection conn)
    {
        using (cmd = db.GetStoredProcedureCommand(USP_OWNER_FIND, conn))
        {
            cmd.Parameters.Add(db.GetParameter(ID_PARAM, DaoUtil.ValueOrDbNull(id)));
            using (dr = cmd.ExecuteReader())
            {
                int ID_COLUMN_INDEX = dr.GetOrdinal(ID_COLUMN);
                int USERNAME_COLUMN_INDEX = dr.GetOrdinal(USERNAME_COLUMN);
                int PASSWORD_COLUMN_INDEX = dr.GetOrdinal(PASSWORD_COLUMN);
                int NAME_COLUMN_INDEX = dr.GetOrdinal(NAME_COLUMN);
                int LAST_NAME_COLUMN_INDEX = dr.GetOrdinal(LAST_NAME_COLUMN);
                int BIRTHDATE_COLUMN_INDEX = dr.GetOrdinal(BIRTHDATE_COLUMN);
                int DNI_COLUMN_INDEX = dr.GetOrdinal(DNI_COLUMN);
                int EMAIL_COLUMN_INDEX = dr.GetOrdinal(EMAIL_COLUMN);
                int ADDRESS_COLUMN_INDEX = dr.GetOrdinal(ADDRESS_COLUMN);
                int PHONE_COLUMN_INDEX = dr.GetOrdinal(PHONE_COLUMN);
                int PROFILE_PIC_COLUMN_INDEX = dr.GetOrdinal(PROFILE_PIC_COLUMN);
                int DISTRICT_ID_COLUMN_INDEX = dr.GetOrdinal(DISTRICT_ID_COLUMN);

                Owner owner = null;
                if (dr.Read())
                {
                    owner = new Owner
                    {
                        Id = DaoUtil.ValueOrDefault<int>(ID_COLUMN_INDEX, dr),
                        Username = DaoUtil.ValueOrDefault<string>(USERNAME_COLUMN_INDEX, dr),
                        Password = DaoUtil.ValueOrDefault<string>(PASSWORD_COLUMN_INDEX, dr),
                        Name = DaoUtil.ValueOrDefault<string>(NAME_COLUMN_INDEX, dr),
                        LastName = DaoUtil.ValueOrDefault<string>(LAST_NAME_COLUMN_INDEX, dr),
                        BirthDate = DaoUtil.ValueOrDefault<DateTime>(BIRTHDATE_COLUMN_INDEX, dr),
                        DNI = DaoUtil.ValueOrDefault<string>(DNI_COLUMN_INDEX, dr),
                        EMail = DaoUtil.ValueOrDefault<string>(EMAIL_COLUMN_INDEX, dr),
                        Address = DaoUtil.ValueOrDefault<string>(ADDRESS_COLUMN_INDEX, dr),
                        PhoneNumber = DaoUtil.ValueOrDefault<string>(PHONE_COLUMN_INDEX, dr),
                        ProfilePicture = DaoUtil.ValueOrDefault<string>(PROFILE_PIC_COLUMN_INDEX, dr),
                        DistrictId = DaoUtil.ValueOrDefault<int>(DISTRICT_ID_COLUMN_INDEX, dr)
                    };
                }
                return owner;
            }
        }
    }

    public List<Owner> FindAll(IDbConnection conn)
    {
        using (cmd = db.GetStoredProcedureCommand(USP_OWNER_FINDALL, conn))
        using (dr = cmd.ExecuteReader())
        {
            int ID_COLUMN_INDEX = dr.GetOrdinal(ID_COLUMN);
            int USERNAME_COLUMN_INDEX = dr.GetOrdinal(USERNAME_COLUMN);
            int PASSWORD_COLUMN_INDEX = dr.GetOrdinal(PASSWORD_COLUMN);
            int NAME_COLUMN_INDEX = dr.GetOrdinal(NAME_COLUMN);
            int LAST_NAME_COLUMN_INDEX = dr.GetOrdinal(LAST_NAME_COLUMN);
            int BIRTHDATE_COLUMN_INDEX = dr.GetOrdinal(BIRTHDATE_COLUMN);
            int DNI_COLUMN_INDEX = dr.GetOrdinal(DNI_COLUMN);
            int EMAIL_COLUMN_INDEX = dr.GetOrdinal(EMAIL_COLUMN);
            int ADDRESS_COLUMN_INDEX = dr.GetOrdinal(ADDRESS_COLUMN);
            int PHONE_COLUMN_INDEX = dr.GetOrdinal(PHONE_COLUMN);
            int PROFILE_PIC_COLUMN_INDEX = dr.GetOrdinal(PROFILE_PIC_COLUMN);
            int DISTRICT_ID_COLUMN_INDEX = dr.GetOrdinal(DISTRICT_ID_COLUMN);

            List<Owner> lOwner = new List<Owner>();
            Owner owner = null;
            while (dr.Read())
            {
                owner = new Owner
                {
                    Id = DaoUtil.ValueOrDefault<int>(ID_COLUMN_INDEX, dr),
                    Username = DaoUtil.ValueOrDefault<string>(USERNAME_COLUMN_INDEX, dr),
                    Password = DaoUtil.ValueOrDefault<string>(PASSWORD_COLUMN_INDEX, dr),
                    Name = DaoUtil.ValueOrDefault<string>(NAME_COLUMN_INDEX, dr),
                    LastName = DaoUtil.ValueOrDefault<string>(LAST_NAME_COLUMN_INDEX, dr),
                    BirthDate = DaoUtil.ValueOrDefault<DateTime>(BIRTHDATE_COLUMN_INDEX, dr),
                    DNI = DaoUtil.ValueOrDefault<string>(DNI_COLUMN_INDEX, dr),
                    EMail = DaoUtil.ValueOrDefault<string>(EMAIL_COLUMN_INDEX, dr),
                    Address = DaoUtil.ValueOrDefault<string>(ADDRESS_COLUMN_INDEX, dr),
                    PhoneNumber = DaoUtil.ValueOrDefault<string>(PHONE_COLUMN_INDEX, dr),
                    ProfilePicture = DaoUtil.ValueOrDefault<string>(PROFILE_PIC_COLUMN_INDEX, dr),
                    DistrictId = DaoUtil.ValueOrDefault<int>(DISTRICT_ID_COLUMN_INDEX, dr)
                };
                lOwner.Add(owner);
            }
            return lOwner;
        }
    }

    public Owner Login(Owner owner, IDbConnection conn)
    {
        using (cmd = db.GetCommand(USP_OWNER_LOGIN, conn))
        {
            cmd.Parameters.Add(db.GetParameter(USERNAME_PARAM, owner.Username));
            cmd.Parameters.Add(db.GetParameter(PASSWORD_PARAM, owner.Password));

            using (dr = cmd.ExecuteReader())
            {
                int ID_COLUMN_INDEX = dr.GetOrdinal(ID_COLUMN);
                int USERNAME_COLUMN_INDEX = dr.GetOrdinal(USERNAME_COLUMN);
                int PASSWORD_COLUMN_INDEX = dr.GetOrdinal(PASSWORD_COLUMN);
                int NAME_COLUMN_INDEX = dr.GetOrdinal(NAME_COLUMN);
                int LAST_NAME_COLUMN_INDEX = dr.GetOrdinal(LAST_NAME_COLUMN);
                int BIRTHDATE_COLUMN_INDEX = dr.GetOrdinal(BIRTHDATE_COLUMN);
                int DNI_COLUMN_INDEX = dr.GetOrdinal(DNI_COLUMN);
                int EMAIL_COLUMN_INDEX = dr.GetOrdinal(EMAIL_COLUMN);
                int ADDRESS_COLUMN_INDEX = dr.GetOrdinal(ADDRESS_COLUMN);
                int PHONE_COLUMN_INDEX = dr.GetOrdinal(PHONE_COLUMN);
                int PROFILE_PIC_COLUMN_INDEX = dr.GetOrdinal(PROFILE_PIC_COLUMN);
                int DISTRICT_ID_COLUMN_INDEX = dr.GetOrdinal(DISTRICT_ID_COLUMN);

                if (dr.Read())
                {
                    owner = new Owner
                    {
                        Id = DaoUtil.ValueOrDefault<int>(ID_COLUMN_INDEX, dr),
                        Username = DaoUtil.ValueOrDefault<string>(USERNAME_COLUMN_INDEX, dr),
                        Password = DaoUtil.ValueOrDefault<string>(PASSWORD_COLUMN_INDEX, dr),
                        Name = DaoUtil.ValueOrDefault<string>(NAME_COLUMN_INDEX, dr),
                        LastName = DaoUtil.ValueOrDefault<string>(LAST_NAME_COLUMN_INDEX, dr),
                        BirthDate = DaoUtil.ValueOrDefault<DateTime>(BIRTHDATE_COLUMN_INDEX, dr),
                        DNI = DaoUtil.ValueOrDefault<string>(DNI_COLUMN_INDEX, dr),
                        EMail = DaoUtil.ValueOrDefault<string>(EMAIL_COLUMN_INDEX, dr),
                        Address = DaoUtil.ValueOrDefault<string>(ADDRESS_COLUMN_INDEX, dr),
                        PhoneNumber = DaoUtil.ValueOrDefault<string>(PHONE_COLUMN_INDEX, dr),
                        ProfilePicture = DaoUtil.ValueOrDefault<string>(PROFILE_PIC_COLUMN_INDEX, dr),
                        DistrictId = DaoUtil.ValueOrDefault<int>(DISTRICT_ID_COLUMN_INDEX, dr)
                    };
                }
                return owner;
            }
        }
    }
}

类所有者daoimpl:IOwnerDao
{
private const string ID_COLUMN=“ID”；
私有常量字符串USERNAME\u COLUMN=“USERNAME”；
private const string PASSWORD_COLUMN=“PASSWORD”；
private const string NAME_COLUMN=“NAME”；
私有常量字符串LAST\u NAME\u COLUMN=“LastName”；
private const string BIRTHDATE_COLUMN=“BIRTHDATE”；
私有常量字符串DNI_COLUMN=“DNI”；
private const string EMAIL_COLUMN=“EMAIL”；
私有常量字符串地址\u COLUMN=“ADDRESS”；
private const string PHONE_COLUMN=“PhoneNumber”；
private const string PROFILE\u PIC\u COLUMN=“ProfilePicture”；
private const string DISTRICT\u ID\u COLUMN=“DistrictId”；
private const string ID_PARAM=“@ID”；
私有常量字符串USERNAME_PARAM=“@user”；
private const string PASSWORD_PARAM=“@pass”；
private const string NAME_PARAM=“@NAME”；
私有常量字符串LAST_NAME_PARAM=“@lastName”；
private const string BIRTHDATE_PARAM=“@BIRTHDATE”；
私有常量字符串DNI_PARAM=“@DNI”；
private const string EMAIL_PARAM=“@EMAIL”；
private const string ADDRESS_PARAM=“@ADDRESS”；
private const string PHONE_PARAM=“@phoneNum”；
private const string PROFILE_PIC_PARAM=“@profilePic”；
private const string DISTRICT_ID_PARAM=“@disId”；
private const string ROW_COUNT_PARAM=“@rowCount”；
伊达他酶db；
IDbCommand；
伊达瑞德博士；
公有人daoimpl（）
{
db=DatabaseFactory.GetSqlDatabase（）；
}
公共整数插入（所有者到插入，IDB连接连接）
{
使用（cmd=db.GetStoredProcedureCommand（USP\u所有者\u插入，conn））
{
Add（db.GetParameter（USERNAME_PARAM，daouutil.ValueOrDbNull（toInsert.USERNAME））；
Add（db.GetParameter（PASSWORD_PARAM，daouutil.ValueOrDbNull（toInsert.PASSWORD））；
Add（db.GetParameter（NAME_PARAM，daouutil.ValueOrDbNull（toInsert.NAME））；
Add（db.GetParameter（LAST_NAME_PARAM，daouutil.ValueOrDbNull（toInsert.LastName））；
Add（db.GetParameter（BIRTHDATE_PARAM，daouutil.ValueOrDbNull（toInsert.BIRTHDATE））；
Add（db.GetParameter（DNI_PARAM，daouutil.ValueOrDbNull（toInsert.DNI））；
Add（db.GetParameter（EMAIL_PARAM，daouutil.ValueOrDbNull（toInsert.EMAIL））；
Add（db.GetParameter（ADDRESS_PARAM，daouutil.ValueOrDbNull（toInsert.ADDRESS））；
Add（db.GetParameter（PHONE_PARAM，daouutil.ValueOrDbNull（toInsert.PhoneNumber））；
Add（db.GetParameter（PROFILE_PIC_PARAM，daouutil.ValueOrDbNull（toInsert.ProfilePicture））；
Add（db.GetParameter（DISTRICT_ID_PARAM，daouutil.ValueOrDbNull（toInsert.DistrictId））；
Add（db.GetOutputParameter（ID_PARAM，SqlDbType.Int））；
cmd.ExecuteNonQuery（）；
返回（int）（（IDataParameter）命令参数[ID_PARAM]）值；
}
}
公共bool更新（所有者更新，IDB连接连接）
{
使用（cmd=db.GetStoredProcedureCommand（USP\u所有者\u更新，康涅狄格州））
{
Add（db.GetParameter（ID_PARAM，daouutil.ValueOrDbNull（toUpdate.ID））；
Add（db.GetParameter（USERNAME_PARAM，daouutil.ValueOrDbNull（toUpdate.USERNAME））；
Add（db.GetParameter（PASSWORD_PARAM，daouutil.ValueOrDbNull（toUpdate.PASSWORD））；
Add（db.GetParameter（NAME_PARAM，daouutil.ValueOrDbNull（toUpdate.NAME））；
Add（db.GetParameter（LAST_NAME_PARAM，daouutil.ValueOrDbNull（toUpdate.LastName））；
Add（db.GetParameter（BIRTHDATE_PARAM，daouutil.ValueOrDbNull（toUpdate.BIRTHDATE））；
Add（db.GetParameter（DNI_PARAM，daouutil.ValueOrDbNull（toUpdate.DNI））；
cmd.Parameters.Add（db.GetParameter（EMAIL_PARAM，daouutil.ValueOrDbNull（toUpdate.EMAIL））；
Add（db.GetParameter（ADDRESS_PARAM，daouutil.ValueOrDbNull（toUpdate.ADDRESS））；
Add（db.GetParameter（PHONE_PARAM，daouutil.ValueOrDbNull（toUpdate.PhoneNumber））；
Add（db.GetParameter（PROFILE_PIC_PARAM，daouutil.ValueOrDbNull（toUpdate.ProfilePicture））；
Add（db.GetParameter（DISTRICT_ID_PARAM，daouutil.ValueOrDbNull（toUpdate.DistrictId））；
Add（db.GetOutputParameter（ROW_COUNT_PARAM，SqlDbType.Int））；
cmd.ExecuteNonQuery（）；
返回（int）（（IDataParameter）命令参数[行计数参数]）。值>0；
}
}
公共bool Delete（对象id，IDbConnection）
{
使用（cmd=db.GetStoredProcedureCommand（USP\u OWNER\u DELETE，conn））
{
Add（db.GetParameter（ID_PARAM，daouutil.ValueOrDbNull（ID））；
Add（db.GetOutputParameter（ROW_COUNT_PARAM，SqlDbType.Int））；
cmd.ExecuteNonQuery（）；
返回（int）（（IDataParameter）命令参数[行计数参数]）。值>0；
}
}
公共所有者查找（对象id，IDbConnection）
{
使用（cmd=db.GetStoredProcedureCommand（USP\u OWNER\u FIND，conn））
{
Add（db.GetParameter（ID_PARAM，daouutil.ValueOrDbNull（ID））；
使用（dr=cmd.ExecuteReader（））
{
int ID_COLUMN_INDEX=dr.GetOrdinal（ID_COLUMN）；
int USERNAME_COLUMN_INDEX=dr.GetOrdinal（USERNAME_COLUMN）；
int PASSWORD_COLUMN_INDEX=dr.GetOrdinal（PASSWORD_COLUMN）；
int NAME_COLUMN_INDEX=dr.GetOrdinal（NAME_COLUMN）；
int LAST_NAME_COLUMN_INDEX=dr.GetOrdinal（LAST_NAME_COLUMN）；
int BIRTHDATE_COLUMN_INDEX=dr.GetOrdinal（BIRTHDATE_COLUMN）；