The state of the connection stays active
in pool, when there is an exception
while executing a query or stored procedure through c#.
The Npgsql
version that I am using is 4.1.7
.
Here is the code that I am trying to execute.
NpgsqlCommand cmd = null;
NpgsqlDataAdapter sda = null;
NpgsqlConnection conn = null;
try {
string sql = "a_test";
conn = new NpgsqlConnection("Server=localhost;Port=5432;Username=admin;Password=test;Database=majordb;SearchPath=dbs;CommandTimeout=300;MaxPoolSize=500;Connection Idle Lifetime=180;Connection Pruning Interval=5;");
cmd = new NpgsqlCommand(sql);
cmd.CommandType = CommandType.StoredProcedure;
sda = new NpgsqlDataAdapter(cmd);
cmd.Connection = conn;
sda.Fill(dataTable);
}
catch (Exception e) {
//log
}
finally {
if(null != sda)
{
try
{
sda.Dispose();
}
catch (Exception)
{
}
}
try
{
cmd.Connection.Close();
cmd.Connection.Dispose();
}
catch (Exception)
{
}
try
{
cmd.Dispose();
}
catch (Exception)
{
}
}
If the above code executes properly without any exception, the connection state in pool goes to idle
, which is correct. But if an exception occurs while executing, like below:
"Npgsql.NpgsqlException (0x80004005): Exception while reading from stream --->
System.IO.IOException: Unable to read data from the transport connection: A connection attempt
failed because the connected party did not properly respond after a period of time, or established
connection failed because connected host has failed to respond."
The connection state in pool shows as active
for about 5 mins or so, even though the close/dispose
methods are called in finally
block. This means the close/dispose
did not properly executed by Npgsql
. If the program keeps the connection state in pool active for every connection ran within 5 mins, then there can be an issue with MaxPoolSize
error.
I wanted to see the connection
state to idle
, even when there is an exception. How do I do this.
Please note: I am not looking for a solution to the exception that I listed above. I am looking for a solution where the connection state is changed to idle
from active
when there is an exception while executing the above code.
To know if the connection state is active
or not I used the following query:
SELECT
pid,
usename,
application_name,
datname,
client_addr,
rank() over (partition by client_addr order by backend_start ASC) as rank,
state,
state_change,
current_timestamp,
query,
query_start,
backend_start,
FROM
pg_stat_activity
WHERE
pid <> pg_backend_pid( )
AND
application_name !~ '(?:psql)|(?:pgAdmin.+)'
AND
datname = current_database()
AND
usename = current_user
Any help is really appreciated.
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