如何插入數據庫的特定列

Question

問題是當我嘗試插入時出現異常錯誤，表明外部數據庫中的數據不匹配

我有一個帶有預訂 ID 的客戶預訂表...pk 作為自動編號，客戶....fk 和日期作為日期時間預訂 ID 是自動遞增的，所以我不需要插入任何東西

我想要實現的是插入到 customer_id 和日期中，僅此而已，但我不斷得到數據不匹配和查詢值的數量與目標字段不同

那么放置這個的正確方法是什么

using (OleDbConnection myCon = new OleDbConnection(ConfigurationManager.ConnectionStrings["DbConn"].ToString())) {
    OleDbCommand cmd = new OleDbCommand();
    cmd.CommandType = CommandType.Text;
    cmd.CommandText = "insert into customer_booking  ([customer_id],[date_in]) values (?,?)";
    cmd.Parameters.AddWithValue("@customer_id", txtusername.Text);
    cmd.Parameters.AddWithValue("@date_in", dtdate_in);
    cmd.Connection = myCon;
    myCon.Open();
    cmd.ExecuteNonQuery();
    System.Windows.Forms.MessageBox.Show("your booking was successful ", "Caption", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
}

Answer 1

使用cmd.Parameters.add('...')方法如下：

using (OleDbConnection myCon = new OleDbConnection(ConfigurationManager.ConnectionStrings["DbConn"].ToString())) {
OleDbCommand cmd = new OleDbCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "insert into customer_booking  ([customer_id],[date_in]) values (@customer_id,@date_in)";
///* Set your column dataType*/
cmd.Parameters.Add("@customer_id", SqlDbType.VarChar , 50).Value = txtusername.Text; 
cmd.Parameters.Add("@date_in", SqlDbType.DateTime).Value = dtdate_in; 
cmd.Connection = myCon;
myCon.Open();
cmd.ExecuteNonQuery();
    System.Windows.Forms.MessageBox.Show("your booking was successful ", "Caption", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
}