[英]When does a db transaction written in ADO.NET actually begin?
One of the key things in database-intensive applications is to keep the transactions as short as possible. 数据库密集型应用程序的关键之一是保持事务尽可能短。
Today I was wondering when this transaction would actually begin: 今天,我想知道这项交易何时真正开始:
using (SqlConnection sqlConnection = new SqlConnection(connectionString))
{
sqlConnection.Open();
/*(1)*/ SqlTransaction sqlTransaction = sqlConnection.BeginTransaction(IsolationLevel.ReadUncommitted);
//Perform some stuff
//...
/*(2)*/ using (SqlCommand command = new SqlCommand(sqlQuery, sqlConnection, sqlTransaction))
{
//Some other stuff
//...
try
{
/*(3)*/sqlCommand.ExecuteNonQuery();
//More irrelevant code
//...
sqlCommand.CommandText = otherQuery;
sqlCommand.ExecuteNonQuery();
sqlTransaction.Commit();
}
catch(Exception)
{
sqlTransaction.Rollback();
throw;
}
}
}
In step (1), (2) or (3)? 在步骤(1),(2)或(3)中? Ideally it should be in step 3.
理想情况下,它应该在步骤3中。
The transaction starts at point 3, the first time you exectue a command on the connection. 事务从第3点开始,这是您第一次在连接上执行命令时。
You can verify this using SQL Server Profiler. 您可以使用SQL Server Profiler进行验证。
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