Question

我正在尝试编写一个Sql语句，根据用户输入的两个日期变量过滤记录。这是我的Sql语句：

         public List<DistributionPacking> filterByDeliveryDate()
    {
        List<DistributionPacking> dateList = new List<DistributionPacking>();

        using (var connection = new SqlConnection(FoodBankDB.connectionString)) // get your connection string from the other class here
        {
            SqlCommand command = new SqlCommand("SELECT d.id, d.packingDate, d.deliveryDate, b.name FROM dbo.Distributions d " +
                "INNER JOIN dbo.Beneficiaries b ON d.beneficiary = b.id WHERE d.deliveryDate BETWEEN @fromDate AND @toDate", connection);
            command.Parameters.AddWithValue("@fromDate", startDate);
            command.Parameters.AddWithValue("@toDate", endDate);
            connection.Open();
            using (var dr = command.ExecuteReader())
            {
                while (dr.Read())
                {
                    string id = dr["id"].ToString();
                    DateTime packingDate = DateTime.Parse(dr["packingDate"].ToString());
                    DateTime deliveryDate = DateTime.Parse(dr["deliveryDate"].ToString());
                    string name = dr["name"].ToString();

                    dateList.Add(new DistributionPacking(id, packingDate, deliveryDate, name));
                }
            }
        }

然而，它告诉我，当从字符串转换日期和/或时间时转换失败，尽管我的数据类型为packingDate和deliveryDate是DateTime。我想知道为什么会这样。

提前致谢。

Answer 1

尝试这样的事情......

SELECT d.id, d.packingDate, d.deliveryDate, b.name 
FROM dbo.Distributions d  INNER JOIN dbo.Beneficiaries b 
ON d.beneficiary = b.id 
WHERE d.deliveryDate 
     BETWEEN CAST(@fromDate AS DATETIME) AND CAST(@toDate AS DATETIME)

SQL语句where子句由两个日期组成

1 个答案: