①
sqlConnection conn = new sqlConnection(string)
try
{
conn.open;
//执行操作
}
catch
{
//错误代码
}
finally
{
conn.close();
}
②
using (sqlConnection conn = new sqlConnection(string))
{
//执行代码
//输出错误
}
①
sqlConnection conn = new sqlConnection(string)
try
{
conn.open;
//执行操作
}
catch
{
//错误代码
}
finally
{
conn.close();
}
②
using (sqlConnection conn = new sqlConnection(string))
{
//执行代码
//输出错误
}