Question

如果UserId = Session["username"]，我必须更新表格行中的某些值但它显示错误：

ExecuteNonQuery：尚未初始化Connection属性。

任何人都可以知道我在做错了什么Session["username"]有我检查过的价值。

SqlConnection conn7 = new SqlConnection(@"Data Source=SANJAY-PC\SQLEXPRESS;Initial Catalog=dev;User ID=sa;Password=sa@123;Pooling=False");
        var qry = "UPDATE Registration (FirstName,LastName,Password,LastName,EmaildId,UserId) " +
      "VALUES (@FirstName, @LastName, @Password, @EmaildId, @UserId) WHERE UserId='" + Session["username"] + "'";
        var cmd = new SqlCommand(qry);
        cmd.Parameters.AddWithValue("@FirstName", Firstname_Update.Text);
        cmd.Parameters.AddWithValue("@LastName", Lastname_Update.Text);
        cmd.Parameters.AddWithValue("@Password", Password_Update.Text);
        cmd.Parameters.AddWithValue("@EmaildId", EmailIdUpdate.Text);
        cmd.Parameters.AddWithValue("@UserId", UserIdUpdate.Text);
        conn7.Open();
        cmd.ExecuteNonQuery();
        conn7.Close();

Answer 1

您需要告诉SqlCommand-object使用哪个连接，更改此行

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Answer 2

两个问题

在SQLCOMMAND中，您应该指定查询字符串，连接
您的更新查询语法错误

..尝试下面

$scope.addItems = function(){
$scope.ui = { showDiv: false ,showDiv2: true };}

Answer 3

对所有输入使用参数，不要在查询中连接字符串。

至于您的错误，您需要指定命令需要使用的连接：

SqlConnection conn7 = new SqlConnection(@"Data Source=SANJAY-PC\SQLEXPRESS;
                           Initial Catalog=dev;User ID=sa;Password=sa@123;Pooling=False");

var qry = " UPDATE Registration SET FirstName = @FirstName, LastName = @LastName," 
        + " Password = @Password, EmaildId = @EmaildId WHERE UserId = @UserCondition";

var cmd = new SqlCommand(qry, conn7 );

cmd.Parameters.AddWithValue("@FirstName", Firstname_Update.Text);
cmd.Parameters.AddWithValue("@LastName", Lastname_Update.Text);
cmd.Parameters.AddWithValue("@Password", Password_Update.Text);
cmd.Parameters.AddWithValue("@EmaildId", EmailIdUpdate.Text);
cmd.Parameters.AddWithValue("@UserId", UserIdUpdate.Text);
cmd.Parameters.AddWithValue("@UserCondition", Session["username"].ToString());
conn7.Open();

cmd.ExecuteNonQuery();

conn7.Close();

Answer 4

UPDATE table_name
SET column1=value1,column2=value2,...
WHERE some_column=some_value;
'Set' Missing

使用cmd.Parameters.AddWithValue更新表值无效

4 个答案: