Question

我是一名新的ASP.NET开发人员，我在表单中有2个输入作为DateTimes; StartDate和EndDate。我想确保它们都在另一个表的Parent的StartDate和EndDate中。逻辑应该如下：

检查项目的StartDate是否在EndDate之前。
检查StartDate＆amp;插入项的EndDate在Customers表

那我怎么做这个逻辑？

为了您的信息，我在数据库中有两个表，即;客户和Items.Their架构是： 客户表：

CREATE TABLE [dbo].[Customers](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Name] [varchar](50) NULL,
    [Job] [varchar](50) NULL,
    [StartDate] [datetime] NOT NULL,
    [EndDate] [datetime] NOT NULL,
 CONSTRAINT [PK_Customers] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

项目表：

CREATE TABLE [dbo].[Items](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Name] [varchar](50) NOT NULL,
    [Description] [varchar](50) NULL,
    [StartDate] [datetime] NOT NULL,
    [EndDate] [datetime] NOT NULL,
    [CustomerID] [int] NOT NULL,
 CONSTRAINT [PK_Items] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

ALTER TABLE [dbo].[Items]  WITH CHECK ADD  CONSTRAINT [FK_Items_Customers] FOREIGN KEY([CustomerID])
REFERENCES [dbo].[Customers] ([ID])
GO

ALTER TABLE [dbo].[Items] CHECK CONSTRAINT [FK_Items_Customers]
GO

我的C＃代码：

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        DateTime startDate = Convert.ToDateTime(txtStartDate.Text);
        DateTime endDate = Convert.ToDateTime(txtEndDate.Text);
        if (DateTime.Compare(startDate, endDate) <= 0)
        {
            using (TestDBEntities1 TEntities = new TestDBEntities1())
            {
                var newItem = new Item
                {
                    Name = txtName.Text,
                    Description = txtDesc.Text,
                    StartDate = startDate,
                    EndDate = endDate,
                    CustomerID = Convert.ToInt32(ComboBox1.SelectedValue)
                };
                TEntities.Items.AddObject(newItem);
                TEntities.SaveChanges();
            }
            lblMessage.Text = "Successfully Added :)";
        }
        else
        {
            lblMessage.Text = "Error!!!";
        }
    }

注意：我正在使用LINQ来查询数据库。我只是错过了检查StartDate＆amp; amp;插入项的EndDate位于Customers表的日期内。

解释

例如，假设我们有一个将要插入的项目的StartDate＃1和EndDate＃1。在Customers表中，我有StartDate＃2和EndDate＃2。逻辑应该执行以下操作：

检查StartDate＃1是否在EndDate＃1
然后，检查StartDate＃1和EndDate＃1是否属于StartDate＃2和EndDate＃2的范围

如何检查项目的日期时间是否在其他两个日期的范围内？

0 个答案: