SqlConnection cn = new SqlConnection(@"DataSource=dbedu.cs.vsb.cz\SQLDB;Persist Security Info=True;User ID=*****;Password=*******");
SqlCommand cmd = new SqlCommand();
string finish = DropDownListFi.SelectedValue;
cn.Open();
String Name = Request.QueryString["Name"];
cmd.CommandText = "UPDATE navaznost_ukolu SET finish=@finish where Name='" + Name + "'";
cmd.Parameters.Add(new SqlParameter("@finish", finish));
cmd.ExecuteNonQuery();
cmd.Clone();
错误信息
Executenonquery connection property has not been initialized.
最佳答案
您当前代码的问题是您没有设置SqlCommand
对象的Connection
属性。试试这个,
SqlCommand cmd = new SqlCommand();
cmd.Connection = cn;
并且您还必须参数化在 name
String Name = Request.QueryString["Name"];
cmd.CommandText = "UPDATE navaznost_ukolu SET finish=@finish where Name=@name";
cmd.Parameters.Add(new SqlParameter("@finish", finish));
cmd.Parameters.Add(new SqlParameter("@name", Name));
完整代码
string finish = DropDownListFi.SelectedValue;
String Name = Request.QueryString["Name"];
string connStr = @"DataSource=dbedu.cs.vsb.cz\SQLDB;
Persist Security Info=True;
User ID=*****;
Password=*******";
string sqlStatement = @"UPDATE navaznost_ukolu
SET finish = @finish
WHERE Name = @Name";
using (SqlConnection conn = new SqlConnection(connStr))
{
using(SqlCommand cmd = new SqlCommand())
{
cmd.Connection = conn;
cmd.CommandText = sqlStatement;
cmd.CommandType = CommandType.Text;
cmd.Parameters.Add(new SqlParameter("@finish", finish));
cmd.Parameters.Add(new SqlParameter("@name", Name));
try
{
conn.Open();
cmd.ExecuteNonQuery();
}
catch(SqlException e)
{
// do something with the exception
// do not hide it
// e.Message.ToString()
}
}
}
正确编码
- 使用
using
语句进行 propr 对象处理 - 使用
try-catch
block 来正确处理对象
关于c# - "executenonquery connection property has not been initialized",我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15852958/