Question

string Update = "UPDATE VehicleReport" +
                        "SET VehicleReg ='"+textBox1.Text+"',CurrentOdometer ='"+textBox5.Text+"',NextService ='"+textBox6.Text+"'" +
                        "WHERE Vehiclenum ='"+comboBox1.Text+"' ;";

        try
        {
            SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=FleetTrackingDatabase;Integrated Security=SSPI");
            conn.Open();
            SqlCommand cmd = new SqlCommand(Update, conn);
            cmd.ExecuteNonQuery();
            conn.Close();
            MessageBox.Show("Updated");
            conn.Close();
        }
        catch (System.Exception f)
        {
            MessageBox.Show(f.Message, "ERROR");
        }

Answer 1

至少这是不正确的：

string Update = "UPDATE VehicleReport" + "SET ...

您需要在VehicleReport和Set

之间添加一个空格

string Update = "UPDATE VehicleReport " + "SET....

Answer 2

添加空格

"UPDATE VehicleReport" +
   " SET VehicleReg ='"+textBox1.Text+"',CurrentOdometer ='"+textBox5.Text+"',NextService='"+textBox6.Text+"'" +
   " WHERE Vehiclenum ='"+comboBox1.Text+"' ;";

Answer 3

表名后面缺少空格：

string Update = "UPDATE VehicleReport"
string Update = "UPDATE VehicleReport "

和WHERE之前相同

Answer 4

你能试试吗，

 string Update = "UPDATE VehicleReport SET VehicleReg ='"+textBox1.Text+"',CurrentOdometer ='"+textBox5.Text+"',NextService ='"+textBox6.Text+"'" + " WHERE Vehiclenum ='"+comboBox1.Text+"' ;";

Answer 5

我真的很震惊有4个答案，但是没有人提到参数化的sql和SQL注入攻击，但无论如何..

正如其他人所提到的，您需要在SET和WHERE字之前添加空格。

但更重要的是，不要以这种方式使用。在查询中使用字符串连接时，代码将为SQL Injection打开。除此之外，您应始终使用parameterizezd queries。

例如;

string Update = "UPDATE VehicleReport SET VehicleReg = @vehiclereg, CurrentOdometer = @current, NextService = @next WHERE Vehiclenum = @vehiclenum;";
SqlCommand cmd = new SqlCommand(Update, conn);
cmd.Parameters.AddWithValue("@vehiclereg", textBox1.Text);
cmd.Parameters.AddWithValue("@current", textBox5.Text);
cmd.Parameters.AddWithValue("@next", textBox6.Text);
cmd.Parameters.AddWithValue("@vehiclenum", comboBox1.Text);

它给了我一个不正确的语法错误'vehicle reg'

5 个答案: