SQlite不更新记录

Question

我试图更新表格中的现有记录，这是表格：

这是我的代码：

using (SQLiteConnection c = new SQLiteConnection(ConnectionString))
{
    c.Open();
    using (SQLiteCommand cmd = new SQLiteCommand())
    {
        try
        {
            string _FINAL_SQL = "UPDATE act_monthly_listings SET loan = " + GRAND_LOAN_TOTAL + " AND interest = " + INTEREST + " AND contr = " + GRANT_CONTRIBUTIONS + " AND payment = " + GRAND_PAYMENTS_TOTAL + " WHERE act = " + act + " AND year = " + year + " AND month = " + month + ";";
            cmd.CommandText = _FINAL_SQL;
            Clipboard.SetText(_FINAL_SQL);
            cmd.Connection = c;
            cmd.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            Clipboard.SetText(ex.ToString());
        }

    }
}

没有抛出任何错误或异常，但它没有更新。

示例sql：

UPDATE act_monthly_listings SET loan = 60 AND interest = 6 AND contr = 0 AND payment = 100 WHERE act = 93 AND year = 2014 AND month = 3;

我希望看到以下记录条目更新：

Answer 1

您的查询不正确，您无法使用＆＃34; AND＆＃34;在SET部分查询中的关键字，你应该使用逗号＆＃34;，＆＃34;分隔您要更新的字段。

请参阅文档以获取正确的UPDATE语句语法： https://sqlite.org/lang_update.html

您的查询应该是：

UPDATE act_monthly_listings SET loan = 60, interest = 6, contr = 0, payment = 100 WHERE act = 93 AND year = 2014 AND month = 3;