laravel sql update isnull with parameters variables

Question

$variable = array("apple" , "orange" , null, "apple2");
DB::statement("UPDATE table1 
                            SET 
                            field1= IsNull($variable[0],field1), 
                            field2= IsNull($variable[2],field2), 
                    where = someconditional")

我想如果数据数组中的字段为空则不更新但仅更新该字段。其他字段（如果不为null）进行更新 如何在laravel中编写此代码？

Answer 1

试试这个

        string str = "";
        str = listBox2.SelectedItem.ToString();

        if (listBox2.Items.Count == 0)
        {
            MessageBox.Show("Production Completed");

            string clb = "";
            if (checkedListBox.Items.Count <= 0)
            {
                for (int i = 0; i < checkedListBox.Items.Count; i++)
                {
                    if (str == "")
                    {
                        str = checkedListBox.Items[i].ToString();
                    }
                }
                    MAcon.Open();
                    OleDbCommand cmd = new OleDbCommand("Insert into  Inventory([Product ID], [Order ID], Barcode, SubBarcode, [Completion Date]) values(@ProductID, @OrderID, @Barcode, @SubBarcode, @CompletionDate)", MAcon);
                    cmd.Parameters.AddWithValue("@ProductID", ProductID.Text);
                    cmd.Parameters.AddWithValue("@OrderID", OrderID.Text);
                    cmd.Parameters.AddWithValue("@Barcode", BarcodeTxt.Text);
                    cmd.Parameters.AddWithValue("@CompletionDate", Date.Text);
                    cmd.Parameters.AddWithValue("@SubBarcode", clb);
                    cmd.ExecuteNonQuery();
                    DialogResult start = MessageBox.Show("Production has begun", "Warning", MessageBoxButtons.OK);
                    MAcon.Close();
            }
        }