cmd.ExecuteNonQuery();返回值为-1
cmd.ExecuteNonQuery();返回值为-1。不知道是那个地方出错了！！！！求高手指点！！
protected void Button1_Click(object sender, EventArgs e)
{
String str = "SELECT * FROM [Car_Park] WHERE CarLisence='" + txtBox1.Text + "'";
SqlConnection conn = new SqlConnection("Data Source=DEEP-20120227AR;Database=Car_Park;User ID=sa;Password=sa");
SqlCommand cmd = new SqlCommand(str, conn);
conn.Open();
if (txtBox1.Text == "")
{
this.Response.Write("<script language=javascript>alert('车牌号不能为空！');</script>");
//return false;
return;
}
if (Convert.ToInt32(cmd.ExecuteScalar()) <= 0)
{
this.Response.Write("<script language=javascript>alert('停车场无此车牌号的车辆！');</script>");
return;
}
else
{
SqlDataReader sd = cmd.ExecuteReader();
sd.Read();//从数据库中读取记录。
string CarportNumber = sd["CarportNumber"].ToString();
string ParkTime = sd["ParkTime"].ToString();
txtBox2.Text = CarportNumber;
txtBox3.Text = ParkTime;//分别获取两个变量，同时把这两个变量的值送显示。
DateTime pt = Convert.ToDateTime(sd["ParkTime"]);
Decimal money;
if (sd["CarportNumber"].ToString().Substring(0, 1).Equals("A"))
{
money = 0.00M;
}
else
{
money = Convert.ToDecimal(((Convert.ToInt32(DateTime.Now.ToString("HH")) - Convert.ToInt32(pt.ToString("HH")))) * 1 + 2.00);//此处的时间计算也是有问题的，两天的时间差会出现负值！！！！
}
sd.Close();
conn.Close();
txtBox4.Text = DateTime.Now.ToString();
txtBox5.Text = money.ToString();
conn.Open();
String Sql = "";
Sql = "INSERT INTO Car_Park(LiKaiShiJian,Money) values(";
Sql += "'" + txtBox4.Text + "',";
Sql += "'" + txtBox5.Text + "')";//此处构造的SQL语句是没有问题的，只是写入不到数据库中。！！！
try
{
int rows= cmd.ExecuteNonQuery();
}
catch (Exception err)
{
MessageBox.Show(err.Message, "修改记录失败");
}
finally
{
conn.Close();
}
}
}
[解决办法]
你的这个cmd还是执行上面的查询语句 ，怎么插入数据呢？ 改成下面红色部分
protected void Button1_Click(object sender, EventArgs e)
{
String str = "SELECT * FROM [Car_Park] WHERE CarLisence='" + txtBox1.Text + "'";
SqlConnection conn = new SqlConnection("Data Source=DEEP-20120227AR;Database=Car_Park;User ID=sa;Password=sa");
SqlCommand cmd = new SqlCommand(str, conn);
conn.Open();
if (txtBox1.Text == "")
{
this.Response.Write("<script language=javascript>alert('车牌号不能为空！');</script>");
//return false;
return;
}
if (Convert.ToInt32(cmd.ExecuteScalar()) <= 0)
{
this.Response.Write("<script language=javascript>alert('停车场无此车牌号的车辆！');</script>");
return;
}
else
{
SqlDataReader sd = cmd.ExecuteReader();
sd.Read();//从数据库中读取记录。
string CarportNumber = sd["CarportNumber"].ToString();
string ParkTime = sd["ParkTime"].ToString();
txtBox2.Text = CarportNumber;
txtBox3.Text = ParkTime;//分别获取两个变量，同时把这两个变量的值送显示。
DateTime pt = Convert.ToDateTime(sd["ParkTime"]);
Decimal money;
if (sd["CarportNumber"].ToString().Substring(0, 1).Equals("A"))
{
money = 0.00M;
}
else
{
money = Convert.ToDecimal(((Convert.ToInt32(DateTime.Now.ToString("HH")) - Convert.ToInt32(pt.ToString("HH")))) * 1 + 2.00);//此处的时间计算也是有问题的，两天的时间差会出现负值！！！！
}
sd.Close();
conn.Close();
txtBox4.Text = DateTime.Now.ToString();
txtBox5.Text = money.ToString();
conn.Open();
String Sql = "";
Sql = "INSERT INTO Car_Park(LiKaiShiJian,Money) values(";
Sql += "'" + txtBox4.Text + "',";
Sql += "'" + txtBox5.Text + "')";//此处构造的SQL语句是没有问题的，只是写入不到数据库中。！！！
SqlCommand cmd2 = new SqlCommand(Sql,conn); try
{
int rows= cmd2.ExecuteNonQuery();
}
catch (Exception err)
{
MessageBox.Show(err.Message, "修改记录失败");
}
finally
{
conn.Close();
}
}
}
