Question

有很多问题与我的问题类似，但没有一个问题能帮助我解决这个问题我正在使用win-forms，使用SQL服务器

在C＃中编码

我有一个datagridview，它从数据库中检索数据，一些数据作为文本，一些是图像我的代码如下所示，将datagridview数据保存到数据库中但这不起作用并抛出错误对象或列名称丢失或为空。对于select into语句，验证..........
请解决我的问题..

try
        {
            ConnectionStringSettings consettings = ConfigurationManager.ConnectionStrings["attendancemanagement"];
            string connectionString = consettings.ConnectionString;
            string StrQuery;
            try
            {
                using (SqlConnection conn = new SqlConnection(connectionString))
                {
                    using (SqlCommand comm = new SqlCommand())
                    {
                        comm.Connection = conn;
                        conn.Open();
                        for (int i = 0; i < dataGridView1.Rows.Count; i++)
                        {
                            StrQuery = @"INSERT INTO dailydemo VALUES ("
                + dataGridView1.Rows[i].Cells["S_No"].Value + ", "
                + dataGridView1.Rows[i].Cells["Employee_Id"].Value + ", "
                + dataGridView1.Rows[i].Cells["Employee_Name"].Value + ", "
                + dataGridView1.Rows[i].Cells["In_time"].Value + ", "
                + dataGridView1.Rows[i].Cells["Out_Time"].Value + ", "
                + dataGridView1.Rows[i].Cells["Date"].Value + ", "
                + dataGridView1.Rows[i].Cells["Week_No_of_The_Month"].Value + ", "
                + dataGridView1.Rows[i].Cells["Attendance"].Value + ", "
                + dataGridView1.Rows[i].Cells["Work_status"].Value + ", "
                + dataGridView1.Rows[i].Cells["Remarks"].Value + ", "
                + dataGridView1.Rows[i].Cells["Image_of_Employee"].Value + ");";
                            comm.CommandText = StrQuery;
                            comm.ExecuteNonQuery();
                        }
                    }
                }
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);
            }

Answer 1

使用此功能可能会全部帮助...

byte[] imgByteArrLogo = new byte[0];
            using (SqlConnection con = new SqlConnection("Your Connection string Here"))
            {
                if (con.State == ConnectionState.Closed)
                {
                    con.Open();
                }
                using (SqlTransaction _pTrans = con.BeginTransaction(IsolationLevel.ReadCommitted))
                {
                    for (int i = 0; i < dataGridView1.Rows.Count; i++)
                    {
                        if (dataGridView1.Rows[i].Cells["Image_of_Employee"].Value != null)
                        {
                            Image _dgvImage = (Image)dataGridView1.Rows[i].Cells["Image_of_Employee"].Value;
                            MemoryStream ms = new MemoryStream();
                            _dgvImage.Save(ms, ImageFormat.Jpeg);
                            imgByteArrLogo = new byte[ms.Length];
                            ms.Position = 0;
                            ms.Read(imgByteArrLogo, 0, imgByteArrLogo.Length);
                        }
                        else
                        {
                            imgByteArrLogo = new byte[0];
                        }

                        try
                        {
                            string sql = "INSERT INTO dailydemo (S_No,Employee_Id ,Employee_Name ,In_time ,Out_Time ,Date,Week_No_of_The_Month,Attendance,Work_status,Remarks,Image_of_Employee) VALUES (@S_No,@Employee_Id ,@Employee_Name ,@In_time ,@Out_Time ,@Date,@Week_No_of_The_Month,@Attendance,@Work_status,@Remarks,@Image_of_Employee)";
                            using (SqlCommand cmd = new SqlCommand(sql, con, _pTrans))
                            {
                                cmd.Parameters.Add(new SqlParameter("@S_No", dataGridView1.Rows[i].Cells["S_No"].Value));
                                cmd.Parameters.Add(new SqlParameter("@Employee_Id", dataGridView1.Rows[i].Cells["Employee_Id"].Value));
                                cmd.Parameters.Add(new SqlParameter("@Employee_Name", dataGridView1.Rows[i].Cells["Employee_Name"].Value));
                                cmd.Parameters.Add(new SqlParameter("@In_time", dataGridView1.Rows[i].Cells["In_time"].Value));
                                cmd.Parameters.Add(new SqlParameter("@Out_Time", dataGridView1.Rows[i].Cells["Out_Time"].Value));
                                cmd.Parameters.Add(new SqlParameter("@Week_No_of_The_Month", dataGridView1.Rows[i].Cells["Week_No_of_The_Month"].Value));
                                cmd.Parameters.Add(new SqlParameter("@Attendance", dataGridView1.Rows[i].Cells["Attendance"].Value));
                                cmd.Parameters.Add(new SqlParameter("@Work_status", dataGridView1.Rows[i].Cells["Work_status"].Value));
                                cmd.Parameters.Add(new SqlParameter("@Remarks", dataGridView1.Rows[i].Cells["Remarks"].Value));
                                cmd.Parameters.Add(new SqlParameter("@Image_of_Employee", imgByteArrLogo));
                                cmd.ExecuteScalar();
                            }
                        }
                        catch (Exception exp)
                        {
                            _pTrans.Rollback();
                            con.Close();
                            _pTrans.Dispose();
                            MessageBox.Show(exp.Message, "Error!!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        }
                    }
                    _pTrans.Commit();
                    _pTrans.Dispose();
                    con.Close();
                }
            }

更新：

请注意，在此示例中，我使用了datagridview单元格名称作为sql表列名称，如果列名不同，则修改它。

如何将datagridview批量数据保存到sql数据库，同时将datagridview数据与图像绑定到c＃中的SQL数据库

1 个答案: