Question

您好我想将Gender列更改为下拉菜单，将Age列更改为每年更改。

CREATE TABLE tbl_Patient
  (
  PatientID INT IDENTITY(1,1) NOT NULL PRIMARY KEY CLUSTERED,
  LabControlID AS Cast(Right(Year(getDate()),4) as varchar(4)) +'-' + RIGHT('00000' + CAST(PatientID AS VARCHAR(5)), 5),
  First_Name varchar(50)
  ,Last_Name varchar(50)
  ,Age int
  ,Male bit
  ,Female bit
  )

Answer 1

你的问题有点模糊。如果您在ASP.NET C＃中执行此操作，它将类似于以下内容：

<asp:DropDownList runat="server" ID="ddlMyControl" DataSourceID="SqlDataSource1" DataTextField="Age" DataValueField="PatientID" ></asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:MyConnectionString %>" SelectCommand="SELECT * FROM [tbl_Patient]"></asp:SqlDataSource>

该控件是一个控件，可用于填充数据库中的数据。请记住，如果要填充下拉列表，可以通过各种不同的方式进行填充。此示例显示了如何从标记执行此操作。

要从Code Behind执行相同的操作，逻辑如下（假设您已在标记页面上创建了控件）：

创建并设置控件的连接（ddlMyControl，假设您已经在标记页面上设置了ID）。
设置控件的DataSource。
DataBind控件到页面。

这将是以下内容：（C＃和VB下面）

string tableNameSpace = "MyDataSet"; //represents the namespace for the dataset
string queryText = "SELECT * FROM [tbl_Patient]";
string connectionString = "My Connection String Details";
//string tableName = "MyDataTable";//if you were adding tables on the fly, you would use this
DataSet ds = new DataSet(tableNameSpace);

using (SqlConnection connection = new SqlConnection(connectionString))
        {

            SqlCommand cmd = new SqlCommand(queryText, connection);//this can also be enclosed in a using statement as well.  See MSDN documentation for more info.
            SqlDataAdapter dataAdapter = new SqlDataAdapter(cmd.CommandText, connection);            

            dataAdapter.Fill(ds); //fills the dataset with data from your query

            //access the table from your dataset.  
            //If you are returning multiple tables, this is not 
            //going to work correctly.  You'll need to know 
            //what the tables are called.  I would suggest here
            //creating a strongly-typed dataset so you can 
            //reference them by name instead of index.

            ddlMyControl.DataSource = ds.Tables[0];
            //We grab the age to show in the control
            ddlMyControl.DataTextField = "Age";
            //To access the control and reference it through
            //code, you can do something like:
            //ddlMyControl.SelectedValue and that would return the 
            //PatientID. 
            ddlMyControl.DataValueField = "PatientID";
            ddlMyControl.DataBind();
        }

VB.NET：

    Dim tableNameSpace As String = "MyDataSet"
    Dim queryText As String = "SELECT * FROM [tbl_Patient]"
    Dim connectionString As String = "My Connection String Details"
    Dim ds As DataSet = New DataSet(tableNameSpace)

    'Enclose in a using block to properly dispose resources
    Using connection As SqlConnection = New SqlConnection(connectionString)

        Dim cmd As SqlCommand = New SqlCommand(queryText, connection) 'Like my post for C# says, this can also be enclosed in a using block.
        Dim dataAdapter As SqlDataAdapter = New SqlDataAdapter(cmd.CommandText, connectionString)
        dataAdapter.Fill(ds)

            ddlMyControl.DataSource = ds.Tables[0]
        '    We grab the age to show in the control
        ddlMyControl.DataTextField = "Age"
        '    To access the control and reference it through
        '    code, you can do something like:
        '    ddlMyControl.SelectedValue and that would return the 
        '    PatientID. 
        ddlMyControl.DataValueField = "PatientID"
        ddlMyControl.DataBind()

    End Using

设置连接和数据源本身就是一个帖子。

除了此处列出的内容之外，还有更多内容，但这是如何实现您想要的基本想法。

我想每年更改Age列和Gender的下拉菜单

1 个答案: