Question

我有一个包含6个字段的访问文件：

ID, Designation, Price, Group, Weight, DeliveryTime

在我的代码中，我首先在我的数据库类中创建了一个OleDbConnection和一个OleDbCommand。

private OleDbConnection _connection = new OleDbConnection(parameter);
private OleDbCommand _command;

之后我执行WriteData方法。

public void WriteData(string tableName, string designation, string price, string group, string weight, string deliveryTime)
    {
        _command.Connection = _connection;
        _command.CommandText = "INSERT INTO " + 
            tableName + " (ID, Designation, Price, Group, Weight, deliveryTime) 
            VALUES (@id, @des, @price, @group, @weight, @deliveryTime)";

        _command.Parameters.AddWithValue("@id", GetNextHighestItemNumber());
        _command.Parameters.AddWithValue("@des", designation);
        _command.Parameters.AddWithValue("@price", price);
        _command.Parameters.AddWithValue("@group", group);
        _command.Parameters.AddWithValue("@weight", weight);
        _command.Parameters.AddWithValue("@deliveryTime", deliveryTime);

        OpenConnection();
        _command.ExecuteNonQuery();
        CloseConnection();

        System.Windows.Forms.MessageBox.Show("Success");
    }

但我的数据库中没有新的数据。我也是这样试过的：

public void WriteData(string tableName, string designation, string price, string group, string weight, string deliveryTime)
    {
        _command.Connection = _connection;
        _command.CommandText = "INSERT INTO " + 
            tableName + " (ID, Designation, Price, Group, Weight, deliveryTime) 
            VALUES (?,?,?,?,?,?)";

        _command.Parameters.AddWithValue("ID", GetNextHighestItemNumber());
        _command.Parameters.AddWithValue("Designation", designation);
        _command.Parameters.AddWithValue("Price", price);
        _command.Parameters.AddWithValue("Group", group);
        _command.Parameters.AddWithValue("Weight", weight);
        _command.Parameters.AddWithValue("DeliveryTime", deliveryTime);

        OpenConnection();
        _command.ExecuteNonQuery();
        CloseConnection();

        System.Windows.Forms.MessageBox.Show("Success");
    }

我忽视了什么吗？

感谢您的帮助！

Answer 1

我添加了一个新的OleDbCommand并将连接，命令和参数应用于它。

public void WriteData(string tableName, string designation, string price, string group, string weight, string deliveryTime)
{
    _command.CommandText = "INSERT INTO " + 
        tableName + " (ID, Designation, Price, Group, Weight, deliveryTime) 
        VALUES (?,?,?,?,?,?)";
    OleDbCommand addDataCommand = new OleDbCommand(_command.CommandText, _connection);     

    addDataCommand .Parameters.AddWithValue("ID", GetNextHighestItemNumber());
    addDataCommand .Parameters.AddWithValue("Designation", designation);
    addDataCommand .Parameters.AddWithValue("Price", price);
    addDataCommand .Parameters.AddWithValue("Group", group);
    addDataCommand .Parameters.AddWithValue("Weight", weight);
    addDataCommand .Parameters.AddWithValue("DeliveryTime", deliveryTime);

    OpenConnection();
    _command.ExecuteNonQuery();
    CloseConnection();

    System.Windows.Forms.MessageBox.Show("Success");
}

似乎你必须创建一个新命令并执行它，因为它现在正在工作。

感谢您在评论中的帮助。

无法在Microsoft Access数据库[C＃]中插入数据

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