C＃OleDbException未處理：沒有給出一個或多個必需參數的值

Question

所以我試圖使用DataAdapter和Datasets將聯繫人添加到我的數據庫。但是當我嘗試添加數據時，我仍然收到相同的錯誤（請參閱標題）

此外，當我更新數據時，它不會給出任何錯誤，但它也不會更新任何內容。

添加用戶代碼

public void AddUser(Contact contact) { 
    command.Connection = getConnection(); 
    command.CommandText = "INSERT INTO tblContact VALUES(Id = @contactid, LastName = @lastname, FirstName = @firstname, Address = @address" 
    + "PostCode = @postcode, City = @city, Gender = @gender, Blocked = @blocked)"; 

    command.Parameters.AddWithValue("@contactid", contact.AccountId); 
    command.Parameters.AddWithValue("@lastname", contact.LastName); 
    command.Parameters.AddWithValue("@firstname", contact.FirstName); 
    command.Parameters.AddWithValue("@address", contact.Address); 
    command.Parameters.AddWithValue("@postcode", contact.PostCode); 
    command.Parameters.AddWithValue("@city", contact.City); 
    bool gender = (contact.Gender == Gender.Male ? true : false); 
    command.Parameters.AddWithValue("@gender", gender); 
    command.Parameters.AddWithValue("@blocked", contact.Blocked); 
    try { 
    adapter.InsertCommand = command; 
    adapter.Update(dsCon, "tblContact"); 
    adapter.Fill(dsCon, "tblContact"); 
    } 
    catch (Exception e) { 
    String code = e.Message; 
    } 

} 

用於更新用戶

public void ModifyUser(Contact contact) 
{ 
    command.Connection = getConnection(); 
    command.CommandText = "UPDATE tblContact SET LastName = @lastname, FirstName = @firstname, Address = @address" 
    + "PostCode = @postcode, City = @city, Gender = @gender, Blocked = @blocked " 
    + "WHERE Id = @contactid"; 

    command.Parameters.AddWithValue("@contactid", contact.AccountId); 
    command.Parameters.AddWithValue("@lastname", contact.LastName); 
    command.Parameters.AddWithValue("@firstname", contact.FirstName); 
    command.Parameters.AddWithValue("@address", contact.Address); 
    command.Parameters.AddWithValue("@postcode", contact.PostCode); 
    command.Parameters.AddWithValue("@city", contact.City); 
    command.Parameters.AddWithValue("@gender", contact.Gender); 
    command.Parameters.AddWithValue("@blocked", contact.Blocked); 

    adapter.UpdateCommand = command; 
    adapter.Update(dsCon, "tblContact"); 
    adapter.Fill(dsCon, "tblContact"); 
} 

發起這些過程

private void btnSave_Click(object sender, EventArgs e) { 
    Contact currentContact = new Contact(); 
    currentContact.AccountId = Int32.Parse(lblID.Text); 
    currentContact.LastName = txtLastName.Text; 
    currentContact.FirstName = txtName.Text; 
    currentContact.Address = txtStreet.Text; 
    currentContact.PostCode = Int32.Parse(txtPostalCode.Text); 
    currentContact.City = txtCity.Text; 
    currentContact.Gender = (rdbMale.Checked == true ? Gender.Male : Gender.Female); 
    currentContact.Blocked = chkBlocked.Checked; 
    currentContact.Address = txtStreet.Text; 
    if(isNewContact){ 
    currentContact.AccountId = (manager.GetContacts().Last().AccountId + 1); 
    manager.GetOleDbManager().AddUser(currentContact); 
    } else { 
     manager.GetOleDbManager().ModifyUser(currentContact); 
    } 
    currentContact.Categories = new List<Category>(); 
    foreach (Object c in lstCategories.SelectedItems) { 
    currentContact.Categories.Add((Category)c); 
    } 

    isNewContact = false; 

} 

如果你能幫助它在我的表格代碼代碼將是太棒了，這裏是我使用的分貝的屏幕截圖 http://i50.tinypic.com/2s93klk.png

Answer 1

您的插入命令不是有效的sql INSERT語句。

command.CommandText = "INSERT INTO tblContact VALUES(@contactid, @lastname, @firstname,"+ 
         "@address,@postcode, @city, @gender, @blocked)"; 

更新commad文本丟失一個逗號

command.CommandText = "UPDATE tblContact SET LastName = @lastname, FirstName = @firstname," + 
         "Address = @address, PostCode = @postcode, City = @city, " + 
         "Gender = @gender, Blocked = @blocked WHERE Id = @contactid"; 

但是，該命令也將失敗，因爲一些OLEDB提供程序（如Microsoft.ACE.OleDb.xx）要求ParameterCollection中有在參數它們在sql文本中出現的確切順序。 （不支持命名參數）。您的更新語句包含@contactid作爲最後一個參數，而您將其添加爲第一個參數。您可以嘗試將AddWithValue序列添加爲@contactid作爲最後一個參數。