Question

这是searchupdate_Click代码：

 protected void searchupdate_Click(object sender, EventArgs e)
 {
    SqlConnection con = Connection.DBconnection();
    {
        SqlCommand com = new SqlCommand("sp_searchupdate", con);
        com.CommandType = CommandType.StoredProcedure;
        com.Parameters.AddWithValue("@id", textstudentid.Text);
        SqlDataAdapter adp = new SqlDataAdapter(com);
        DataSet ds = new DataSet();
        adp.Fill(ds);
        txttamil.Text = ds.Tables[0].Rows[0]["Tamil"].ToString();
        txtenglish.Text = ds.Tables[0].Rows[0]["English"].ToString();
        txtmaths.Text = ds.Tables[0].Rows[0]["Maths"].ToString();
        txtscience.Text = ds.Tables[0].Rows[0]["Science"].ToString();
        txtsocialscience.Text = ds.Tables[0].Rows[0]"SocialScience"].ToString();
    }
 }

当我输入学生ID和搜索时，它会在textboxes显示学生标记。

之后我想编辑和更新。

为此，我添加了上面的代码，这里是stored procedure：

ALTER PROCEDURE sp_searchupdate
(
    @id int,
    @Tamil varchar(50),
    @English varchar(50),
    @Maths varchar(50),
    @Science varchar(50),
    @SocialScience varchar(50)
)

AS
IF EXISTS (SELECT * FROM studentresult WHERE id_student='@id') 
begin
SELECT id_student FROM studentresult WHERE id_student='@id'
END

当我编辑标记并点击更新按钮时，它会显示错误。

这是我的输出screenshot

我可以知道，我在代码中的错误，我是.net。

的新手

任何人都可以帮助我吗？

更新

ALTER PROCEDURE sp_searchupdate
(
    @id int,
@Tamil Varchar (100),
@English varchar (50),
@Maths Varchar (50),
@Science Varchar (50),
@SocialScience Varchar (50) 
)

AS
IF EXISTS (SELECT * FROM studentresult WHERE id_student=@id) 
BEGIN
UPDATE studentresult SET Tamil = @Tamil,English = @English, Maths = @Maths,Science = @Science,SocialScience = @SocialScience WHERE id = @id
END

Answer 1

首先，您必须了解当前代码的工作原理...
让我们说当你点击searchupdate这应该做什么样的工作？
现在，基于您的代码实际上是将TextBox设置为您检索的Database值。

这是你所期望的吗？答案是否
由于您的功能1用于搜索而另一个用于更新....我已经分为2个按钮。

// This is First Button
protected void btnSearch_Click(object sender, EventArgs e)
{
    // What does theis code here do ??
    SqlConnection con = Connection.DBconnection();
    {
        SqlCommand com = new SqlCommand("PROCEDURE_SELECT", con);
        com.CommandType = CommandType.StoredProcedure;
        com.Parameters.AddWithValue("@id", txtstudentid.Text.Trim());
        SqlDataAdapter adp = new SqlDataAdapter(com);
        DataSet ds = new DataSet();
        adp.Fill(ds);

        // SEt value to TextBox & make sure your value below is not Null else it will throw you null exception due to you use .ToString()
        txttamil.Text = ds.Tables[0].Rows[0]["Tamil"].ToString();
        txtenglish.Text = ds.Tables[0].Rows[0]["English"].ToString();
        txtmaths.Text = ds.Tables[0].Rows[0]["Maths"].ToString();
        txtscience.Text = ds.Tables[0].Rows[0]["Science"].ToString();
        txtsocialscience.Text = ds.Tables[0].Rows[0]["SocialScience"].ToString();
    }    
}

// This is second Button
protected void btnUpdate_Click(object sender, EventArgs e)
{
    using (SqlConnection con = Connection.DBconnection())
    {
        using (SqlCommand cmd = new SqlCommand("PROCEDURE_UPDATE", con))
        {
            cmd.CommandType = CommandType.StoredProcedure;

            // Add your Parameter
            cmd.Parameters.AddWithValue("@id", txtstudentid.Text.Trim());
            cmd.Parameters.AddWithValue("@tamil", txttamil.Text.Trim());
            cmd.Parameters.AddWithValue("@english", txtenglish.Text.Trim());
            cmd.Parameters.AddWithValue("@math", txtmaths.Text.Trim());
            cmd.Parameters.AddWithValue("@science", txtscience.Text.Trim());
            cmd.Parameters.AddWithValue("@socialScience", txtsocialscience.Text.Trim());


            con.Open();

            // Execute your Query
            cmd.ExecuteNonQuery();

            // Clear All The Data in Current TextBOx and press search again with the ID
            txttamil.Text = string.Empty;
            txtenglish.Text = string.Empty;
            txtmaths.Text = string.Empty;
            txtscience.Text = string.Empty;
            txtsocialscience.Text = string.Empty;

            Response.Write("You have updated the value... Try to Search again...");
        }

        // UPDATE Query as per below
        // IF EXISTS (SELECT * FROM studentresult WHERE id_student='@id') 
        // BEGIN
        //     UPDATE TABLE SET tamil = @tamil and so on... WHERE id = @id
        // END
        // ELSE
        // BEGIN
        //     INSERT DATA HERE
        // END
    }
}

SQL Proc

CREATE PROCEDURE proc_Upd_Student
    -- Add the parameters for the stored procedure here
    @id VARCHAR(100),
    @tamil VARCHAR(100),
    @english VARCHAR(100),
    @maths VARCHAR(100),
    @science VARCHAR(100),
    @socialscience VARCHAR(100)     
AS
BEGIN
    -- CHECK IF THE TABLE CONTAIN THE SAME ID
    IF (SELECT COUNT(1) FROM TABLE WHERE id = @id) > 0 
    BEGIN
        -- I DO UPDATE TO THE TABLE
        UPDATE TABLE
        SET Column = VALUE
        WHERE id = @id
    END
    ELSE
    BEGIN
        -- IF A NEW ID ? THEN I DO INSERT, IF YOUR ID IS IDENTITY THEN YOU CAN SKIP IT NO NEED TO INSERT
        INSERT INTO TABLE (COLUMN)
        VALUE
        (PARAM)
    END
END

上面的商店程序适用于Update & Insert ...由于程序不同，您的Select proc可以保留。如果要合并，请添加一个名为@Action

的参数

Answer 2

由于您的SP需要参数。

您必须将预期参数传递给C＃中的存储过程。如下所示，

<强> btnSearch_Click

com.Parameters.AddWithValue("@Tamil", "");
com.Parameters.AddWithValue("@English", "");
com.Parameters.AddWithValue("@Maths", "");
com.Parameters.AddWithValue("@Science", "");
com.Parameters.AddWithValue("@SocialScience", "");

<强> btnUpdate_Click

// Add your Parameter
cmd.Parameters.AddWithValue("@id", txtstudentid.Text);
cmd.Parameters.AddWithValue("@tamil", txttamil.Text);
cmd.Parameters.AddWithValue("@english", txtenglish.Text);
cmd.Parameters.AddWithValue("@math", txtmaths.Text);
cmd.Parameters.AddWithValue("@science", txtscience.Text);
cmd.Parameters.AddWithValue("@socialScience", txtsocialscience.Text);

c＃中更新记录中的问题

2 个答案: