Question

我是c＃的新手并且在将数据表单插入数据库时遇到问题。以下是类和过程定义的代码。当我按下按钮Save(btnSaveUser)时，它会显示错误消息

处理请求时发生了一些错误

当数据插入数据库时是否显示错误消息。

btnSaveUser代码：

private void btnSaveUser_Click(object sender, EventArgs e)
{
    try
    {
        int result = uc.ManageUser(txtFullName.Text, txtAddress.Text, txtPhone.Text, txtEmail.Text, Convert.ToDateTime(dateTimePickerJoinedDate.Text), txtUserame.Text, txtPassword.Text, Convert.ToDateTime(dateTimePickerCreatedDate.Text), "I");

        if (result == 1)
        {
            MessageBox.Show("New User Saved");
            dgvUserDetails.DataSource = uc.SelectAllUsers();
            //MakeFieldsBlank();
        }
        else
        {
            MessageBox.Show("SOME ERRORS OCCURRED WHILE PROCESSING THE REQUEST");
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

UserClass.cs：

public class UserClass
{
    SqlConnection conn = new SqlConnection(DataConnectionClass.DbConnection);

    public int ManageUser(String Name, String Address, String Phone, String Email, DateTime JoinedDate, String Username, String Password,DateTime CreatedDate,String Mode)
    {
        try
        {
            int result = 0;
            SqlCommand cmd = new SqlCommand("sp_ManageUser", conn);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@StaffID",DBNull.Value);
            cmd.Parameters.AddWithValue("@Name", Name);
            cmd.Parameters.AddWithValue("@Address", Address);
            cmd.Parameters.AddWithValue("@Phone", Phone);
            cmd.Parameters.AddWithValue("@Email", Email);
            cmd.Parameters.AddWithValue("@JoinedDate", JoinedDate);
            cmd.Parameters.AddWithValue("@Username", Username);
            cmd.Parameters.AddWithValue("@Password", Password);
            cmd.Parameters.AddWithValue("@CreatedDate", CreatedDate);
            cmd.Parameters.AddWithValue("@Mode", Mode);

            conn.Open();
            result = cmd.ExecuteNonQuery();
            conn.Close();
            return result;
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

程序定义：

ALTER PROCEDURE [dbo].[sp_ManageUser]
    @StaffID int,
    @Name nvarchar(100),
    @Address nvarchar(500),
    @Phone nvarchar(100),
    @Email nvarchar(100),
    @JoinedDate date,
    @Username nvarchar(50),
    @Password nvarchar(max),
    @CreatedDate date,
    @Mode varchar(1)
AS
BEGIN
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    if(@Mode='I')
        insert into tbl_Staff     (Name, Address, Phone, Email, JoinedDate, Username, Password, CreatedDate) 
        values(@Name, @Address, @Phone, @Email, @JoinedDate, @Username, @Password, @CreatedDate)

    if(@Mode='U')
       Update tbl_Staff 
       set Name = @Name,
           Address = @Address,
           Phone = @Phone,
           Email = @Email,
           JoinedDate = @JoinedDate,
           Username = @Username,
           Password = @Password,
           CreatedDate = @CreatedDate 
       where 
           StaffID = @StaffID

    if(@Mode='D')
        Delete from tbl_Staff 
        where StaffID = @StaffID
end

Answer 1

UserClass.ManageUser()返回SqlCommand.ExecuteNonQuery()的结果，返回受影响的行数。查看存储过程，它执行SET NOCOUNT ON，它将停止返回受存储过程影响的行数。这就解释了为什么你会看到这条消息。

尝试注释掉SET NOCOUNT ON，这应该允许返回插入的行数。

Answer 2

此：

ExecuteNonQuery() returns -1 when execute the stored procedure

表示存储过程的返回值始终为-1。

你检查过它实际返回的是什么吗？如果它总是返回-1那么你总会得到一条错误信息。

数据已插入数据库但显示错误消息

2 个答案: