SqlCommand query=new SqlCommand("update registration set Name='"+name+
"',Gender='"+gender+"',Blood_Group='"+blood+"',Date_Of_Birth='" +
dateTimePicker1+"',City='"+city+"',Phone_Number='" + phone +
"',Email='"+email+
"' where Id='"+id+"','"+username +
"','"+pass+"','"+utype+"'",conn);
query.ExecuteNonQuery();
欢迎使用StackOverflow,
为了更好地了解SqlCommand的工作原理,请尝试阅读this
我建议您添加有关错误的更多信息
我试图稍微重构您的代码,以帮助您解决问题:
1)首先,我们创建一个字符串,该字符串将存储您的查询并使用“ @”字符记录变量名称
string query =
$"UPDATE registration " +
$"SET Name = @name," +
$" Gender = @gender," +
$" Blood_Group = @blood," +
$" Date_Of_Birth = @datedime'," +
$" City = @city" +
$" Phone_Number = @phone" +
$" Email = @email " +
$"WHERE Id = @id AND " +
$" username = @unsername AND" +
$" password = @pass AND " +
$" utype = @userType";
2)然后我们像这样打开SqlConnection:
SqlConnection connection = new SqlConnection(connectionString)
3)接下来,我们实例化命令,并添加参数
SqlCommand command = new SqlCommand(query, connection);
command.Parameters.Add("@name", SqlDbType.VarChar(30));//max length 30 characters
command.Parameters["@name"].Value = name;// here you assign your variables
command.Parameters.Add("@gender", SqlDbType.VarChar(1));
command.Parameters["@gender"].Value = gender;
4)继续添加所有其他变量,以相同的方式,如果在选择哪个SqlDbType时遇到麻烦,here则具有所有类型的含义
希望我能提供帮助,不要害怕问,并要求澄清,祝您好运!