c#个人记录常用方法(更新中)

1.日期毫秒转换为标准的C#日期格式

//使用时,先将秒Convert.ToInt64,返回格式2015-2-10 14:03:33
public DateTime JavaTimeToC(long ltime)
{
    long time_JAVA_Long = ltime;//java长整型日期，毫秒为单位
    DateTime dt_1970 = new DateTime(1970, 1, 1);
    long tricks_1970 = dt_1970.Ticks;//1970年1月1日刻度
    long time_tricks = tricks_1970 + time_JAVA_Long * 10000;//日志日期刻度
    DateTime dt = new DateTime(time_tricks, DateTimeKind.Unspecified).AddHours(8);//转化为DateTime
    return dt;
}

2.带事务的数据库插入更新删除方法

public void DbOp(List<string> sqlNum, ref string error)
{
    if (sqlNum.Count <= 0)
    {
        error = "sql语句为空,没有订单数据!";
        return;
    }
    try
    {
        if (!string.IsNullOrEmpty(strDbConnection))//缺少数据库连接字符串
        {
            using (OracleConnection con = new OracleConnection(strDbConnection))
            {
                using (OracleCommand cmd = con.CreateCommand())
                {
                    con.Open();
                    OracleTransaction trans = con.BeginTransaction();//开始事务
                    cmd.Transaction = trans;//设置事务
                    string[] sql = sqlNum.ToArray();
                    try
                    {

                        for (int i = 0; i < sql.Length; i++)
                        {
                            cmd.CommandText = sql[i];
                            cmd.ExecuteNonQuery();
                        }
                        trans.Commit();//提交事务
                    }
                    catch (Exception ex)
                    {
                        error += ex;
                        trans.Rollback();//回滚
                    }
                    finally
                    {
                        con.Close();//始终关闭数据库连接
                    }
                }
            }
        }
        else
        {
            //缺少数据库连接字符串
            error += "缺少数据库连接字符串";
        }
    }
    catch (Exception ex)
    {

        error += ex;
    }
}

3.数据库查询方法

public  DataSet Query(string SQLString)
{
    using (OracleConnection connection = new OracleConnection(strDbConnection))
    {
        DataSet ds = new DataSet();
        try
        {
            connection.Open();
            OracleDataAdapter command = new OracleDataAdapter(SQLString, connection);
            command.Fill(ds, "ds");
        }
        catch (System.Data.OracleClient.OracleException ex)
        {
            throw new Exception(ex.Message);
        }
        finally
        {
            connection.Close();
        }
        return ds;
    }
}

4.DataTime,转换为string类型

public string DateTimeChange(DateTime dt)
{
    string strDT = dt.Year.ToString();
    if (dt.Month.ToString().Length == 1)
    {
        strDT += "-0" + dt.Month.ToString();
    }
    else
    {
        strDT += "-" + dt.Month.ToString();
    }

    if (dt.Day.ToString().Length == 1)
    {
        strDT += "-0" + dt.Day.ToString();
    }
    else
    {
        strDT += "-" + dt.Day.ToString();
    }

    if (dt.Hour.ToString().Length == 1)
    {
        strDT += " 0" + dt.Hour.ToString();
    }
    else
    {
        strDT += " " + dt.Hour.ToString();
    }

    if (dt.Minute.ToString().Length == 1)
    {
        strDT += ":0" + dt.Minute.ToString();
    }
    else
    {
        strDT += ":" + dt.Minute.ToString();
    }

    if (dt.Second.ToString().Length == 1)
    {
        strDT += ":0" + dt.Second.ToString();
    }
    else
    {
        strDT += ":" + dt.Second.ToString();
    }
    return strDT;
}