刪除一行-SQL C＃

Question

您好，我想從表格中刪除一行，我有3個用於Recipe，Ingredient的表格，並且我正在使用第3個表格來組合Recipe和Ingredient的表格，

我的問題是我可以添加一行，但是我不知道如何刪除一行，我真的不知道該怎么做。

代碼下來請幫助^^“

private void btnAddToRecpie_Click(object sender, EventArgs e)
    {
        string query = "INSERT INTO RecpieIngredient VALUES (@RecpieId,@IngredientId)";

        using (connection = new SqlConnection(connectionString))
        using (SqlCommand cmnd = new SqlCommand(query, connection))
        {
            connection.Open();
            cmnd.Parameters.AddWithValue("@RecpieId", lstRecpie.SelectedValue);
            cmnd.Parameters.AddWithValue("@IngredientId",lstAllIngredient.SelectedValue);
            cmnd.ExecuteScalar();
        }
        PopulateRecpie();
    }

    private void butToDelete_Click(object sender, EventArgs e)
    {
        string query = "DELETE FROM  RecpieIngredient WHERE (@RecpieId , @IngredientId)=@RecpieId , @IngredientId ";

      //  a.Name FROM Ingredient a INNER JOIN RecpieIngredient x ON a.Id = x.IngredientId INNER JOIN Recpie m ON m.Id=x.RecpieId WHERE m.Id=" + index;
        using (connection = new SqlConnection(connectionString))
        using (SqlCommand cmnd = new SqlCommand(query, connection))
        {
            connection.Open();

            cmnd.Parameters.AddWithValue("@RecpieId", lstRecpie.SelectedValue);
            cmnd.Parameters.AddWithValue("@IngredientId", lstAllIngredient.SelectedValue);

            cmnd.ExecuteNonQuery();

        }
        PopulateRecpie();
    }

Answer 1

這個：

INSERT INTO RecpieIngredient VALUES (@RecpieId,@IngredientId)

確實是：

INSERT INTO RecpieIngredient (RecpieId, IngredientId) VALUES (@RecpieId, @IngredientId)

DELETE語句沒有這種簡寫形式，需要您明確提及列名：

DELETE FROM RecpieIngredient WHERE RecpieId = @RecpieId AND IngredientId = @IngredientId

不過，您自己可以很輕松地解決問題:)

Answer 2

您刪除語句是錯誤的。 它應該是

string query = "DELETE FROM RecpieIngredient 
                         WHERE RecpieId = @RecpieId 
                         AND IngredientId = @IngredientId";