将选定的值添加到用户配置文件

问题描述

确定我有一个按钮，onclick它减少选择值的数量1.这是工作，下一步它添加选定的选择到用户配置文件中名为Rented的列。
当我运行代码，它告诉我，我错过了一个;从查询，但代码显示没有错误。
这对我很迷惑。

b $ b

  protected void Button2_Click（object sender，EventArgs e）
 {
 OleDbConnection conn = new OleDbConnection（Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = | DataDirectory | \\ASPNetDB.mdb; Persist Security Info = True）; 
 {
 da.InsertCommand = new OleDbCommand（INSERT INTO UserProfile（Rented）VALUES（@Rented）WHERE（[UserName] =？），conn）; 
 string dvdrent = DG_Latest.SelectedRow.Cells [1] .Text; 
 da.InsertCommand.Parameters.AddWithValue（@ Rented，dvdrent）; 
 
 var myquery = string.Format（UPDATE DVD SET Stock =库存 -  1 WHERE Title =）; 
 var row = DG_Latest.SelectedRow; 
 var title = row.Cells [1] .Text; 
 myquery = string.Format（myquery +'{0}'，title）; 
 
 conn.Open（）; 
 
 using（OleDbCommand cmd = new OleDbCommand（myquery，conn））
 cmd.ExecuteNonQuery（）; 
 
 da.InsertCommand.ExecuteNonQuery（）; 
 
 conn.Close（）; 
 conn.Dispose（）; 
} 
} 
  

解决方案

缺少来自sql查询的; 。所以你需要改变它。

myquery = string.Format（myquery +'{0};'，title）; p>

注意标题参数附加到字符串 myquery 后的字母分号。

另一方面，如果先设置 title ，然后使用以下命令创建整个查询字符串： / p>

  var row = DG_Latest.SelectedRow; 
 var title = row.Cells [1] .Text; 
 var myquery = String.Format（UPDATE DVD SET Stock = Stock  -  1 WHERE Title = {0};，title）; 
  

编辑：你也错过了INSERT SQL命令的分号。你需要有：

  da.InsertCommand =新的OleDbCommand（INSERT INTO用户配置（租用）VALUES（@Rented）WHERE（ [UserName] =？）;，conn）; 
  

Ok I have a button and onclick it reduces the number of select value by 1. That is working, next it adds selected choice to a column in the users profile called Rented.When I run the code it tells me I am missing a ; from a query, but the code shows no errors.This is very puzzling to me.If somebody could point out what im doing wrong it would be great.

Code

protected void Button2_Click(object sender, EventArgs e)
{
    OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\\ASPNetDB.mdb;Persist Security Info=True");
    {
        da.InsertCommand = new OleDbCommand("INSERT INTO UserProfile (Rented) VALUES (@Rented) WHERE ([UserName] = ?)", conn);
        string dvdrent = DG_Latest.SelectedRow.Cells[1].Text;
        da.InsertCommand.Parameters.AddWithValue("@Rented", dvdrent);

        var myquery = string.Format("UPDATE DVD SET Stock = Stock - 1 WHERE Title =  ");
        var row = DG_Latest.SelectedRow;
        var title = row.Cells[1].Text;
        myquery = string.Format(myquery + "'{0}'", title);

        conn.Open();

        using (OleDbCommand cmd = new OleDbCommand(myquery, conn))
            cmd.ExecuteNonQuery();

        da.InsertCommand.ExecuteNonQuery();

        conn.Close();
        conn.Dispose();
    }
}

解决方案

You are missing the ; from the sql query. So you need to change it to this.

myquery = string.Format(myquery + "'{0};'", title);

Notice the literal semi-colon after the title parameter has been appended to the string myquery.

As a side-note it might be easier if you set the title first and then created the whole query string in one go using:

var row = DG_Latest.SelectedRow;
var title = row.Cells[1].Text;
var myquery = String.Format("UPDATE DVD SET Stock = Stock - 1 WHERE Title = {0};", title);

EDIT: You've missed the semi-colon from the INSERT SQL command as well. You need to have:

da.InsertCommand = new OleDbCommand("INSERT INTO UserProfile (Rented) VALUES (@Rented) WHERE ([UserName] = ?);", conn);

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