Question

尝试从用户从文本框输入的数据执行SQL语句，一旦他们单击一个按钮就应该插入到表中，但是说我在INSERT语句中有错误

这是点击时的按钮代码：

 private void SaveBtn_Click(object sender, EventArgs e)
    {
        string Invoice = InvoiceNoTxt.Text;
        string Account = AccountTxt.Text;
        string dates = textBox1.Text;
        string TotalSells = TotalSellTxt.Text;
        string Vats = VatTxt.Text;
        string TotalCosts = TotalCostTxt.Text;

        if (EditChoice == 1)
        {
            //this is the SQL statement that updates the table
            Sql = String.Format("UPDATE InvoiceHeader " + "SET AccountCode = {0}," + "Day = '{1}'," + "TotalSell = {2}, " + "Vat = {3}, " + "TotalCost = {4}, "  + "WHERE InvoiceNo = {5};", Account, dates, TotalSells, Vats, TotalCosts, Invoice);
        }
        else
        {
            //this is the SQL statement that adds to the table in the database
            Sql = String.Format("INSERT INTO InvoiceHeader(AccountCode,Day,TotalSell,Vat,TotalCost) " + "VALUES " + "({0}," + "'{1}'," + "{2}," + "{3}," + "{4});", Account, dates, TotalSells, Vats, TotalCosts);
        }
        //this is calling the method that executes the SQL code
        La(Sql);
        //this reloads the data from the database with the new data in it
        LoadData();
        //this clears the data in the textfields and refreshs the panels to use again
        Back();
    }

这是执行sql的执行方法：

 private void La(String Sql)
    {
        //this code in the method allows for the sql to execute from all the statements
        DbConn = new OleDbConnection(ConString);
        DbCmd = new OleDbCommand(Sql, DbConn);
        DbConn.Open();
        DbCmd.ExecuteNonQuery();
        DbConn.Close();
    }

Answer 1

它可能是查询文本中的额外逗号。

$query_str = "
    SELECT company_id
    FROM technologies
";
$query = mysqli_query($con, $query_str);
while ($result = mysqli_fetch_assoc($query)) {
    $comp = $result['company_id'];
    $query_str2 = "
        SELECT *
        FROM companies
        WHERE company_id <> '".$comp."'
    ";
    $query2 = mysqli_query($con, $query_str2);

}

如果您的查询文本在多行上，则更容易发现。

"UPDATE InvoiceHeader " + "SET AccountCode = {0}," + "Day = '{1}'," + "TotalSell = {2}, " + "Vat = {3}, " + "TotalCost = {4}, "  + "WHERE InvoiceNo = {5};"

Answer 2

“Day”这个词可能是一个系统保留字，尝试在它周围加上方括号......

Sql = String.Format("INSERT INTO InvoiceHeader(AccountCode,[Day],TotalSell,Vat,TotalCost) " + "VALUES " + "({0}," + "'{1}'," + "{2}," + "{3}," + "{4});", Account, dates, TotalSells, Vats, TotalCosts);

Sql = String.Format("UPDATE InvoiceHeader " + "SET AccountCode = {0}," + "[Day] = '{1}'," + "TotalSell = {2}, " + "Vat = {3}, " + "TotalCost = {4}, "  + "WHERE InvoiceNo = {5};", Account, dates, TotalSells, Vats, TotalCosts, Invoice);

INSERT语句错误，未执行

2 个答案: