Question

c#的一个修改密码的程序

写了一个c#修改密码的程序，但是跳出了成功更新密码的框但是数据库的资料未被改写求指点 if (maskedTextBox3.Text == maskedTextBox2.Text) { string userName = this.textBox1.Text.ToString(); string userPwd = this.maskedTextBox1.Text.ToString(); string newPwd = this.maskedTextBox2.Text.ToString(); SqlConnection conn = new SqlConnection("server=localhost;database=internet;uid=sa;pwd=lovlng0802;"); conn.Open(); SqlCommand cmd = new SqlCommand("select count(*) from login where username='" + userName + "'and password='" + userPwd + "'",conn); int count = Convert.ToInt32(cmd.ExecuteScalar()); if (count > 0) { SqlCommand update = new SqlCommand("update login set password='" + newPwd + "'where username = '" + userName + "'", conn); MessageBox.Show("密码更新完毕"); } else { MessageBox.Show("账户或密码错误"); } } else { MessageBox.Show("重复密码错误"); } } } }
conn.Open(); SqlCommand cmd = new SqlCommand("select count(*) from login where username='" + userName + "'and password='" + userPwd + "'",conn);
int count = Convert.ToInt32(cmd.ExecuteScalar());
if (count > 0)
{
SqlCommand update = new SqlCommand("update login set password='" + newPwd + "'where username = '" + userName + "'", conn);
MessageBox.Show("密码更新完毕");
}

Answer 1

if (count > 0)
{
SqlCommand update = new SqlCommand("update login set password='" + newPwd + "'where username = '" + userName + "'", conn);
MessageBox.Show("密码更新完毕");
}//这里的代码貌似有问题啊
数据库执行修改的操作咧？update.ExecuteNonQuery()没写？没写完整吧？

Answer 2

最主要的错误，在更新 update那个sql上，where前面掉了一个空格，这个会导致你的update无效。