本文介绍了Executescalar要求命令具有事务的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
目前我正在使用带有SQL Server 2014的asp.net
currently i m using asp.net with SQL Server 2014
while executing the below coding
string query = "INSERT INTO [Classes] ([Class],[NoOfSections],[DateCreated]," +
"[LastModified]) output inserted.Id VALUES ('" + classname + "' ,'" + noOfSections + "',getdate(),getdate())";
SqlConnection con = CreateConnection();
con.Open();
SqlCommand cmd = new SqlCommand();
cmd.CommandText = query;
cmd.Connection = con;
SqlTransaction trans ;
using (trans= con.BeginTransaction())
{
long classId = Convert.ToInt64(cmd.ExecuteScalar());
//int? classId = (oclass as int);
AddNewSections(classId, noOfSections);
trans.Commit();
}
con.Close();
i m getting the below error
ExecuteScalar requires the command to have a transaction when the connection assigned to the command is in a pending local transaction. The Transaction property of the command has not been initialized.
我尝试过：
帮助我PLZ ..即时尝试使用事务获取插入的记录autoid。我怎样才能实现呢？
What I have tried:
help me plz.. i m trying to fetch the inserted records autoid using transactions. how can i achieve it?
推荐答案
trans= con.BeginTransaction();
cmd = new SqlCommand(query, con, tran);
long classid= Convert.toInt64(cmd.ExecuteNonQuery());
trans.Commit();
ExecuteScalar（）用于查询（选择）只返回一个字段。
插入/更新使用ExecuteNonQuery（）。
ExecuteScalar() is used for query ("select") that returns just one field.
to insert/update ExecuteNonQuery() is used.
string sql = "INSERT INTO MyTable (uName) OUTPUT inserted.id VALUES ('abcd')";
using (SqlConnection con = new SqlConnection(strConnect))
{
con.Open();
using (SqlTransaction trans = con.BeginTransaction())
{
using (SqlCommand cmd = new SqlCommand(sql, con, trans))
{
int x = (int)cmd.ExecuteScalar();
Console.WriteLine(x);
trans.Commit();
}
}
}
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