I'm logging data using AdoNetAppender_SqlServer. Some of the info I want
to log is best expressed in SQL columns of the int data type. Also some
of the information is only defined during certain events.
Ideally, when I log other events, the undefined int information should
be shown as SQL nulls. However so far I've only been able to figure out
how to log int values using a "magic" numerical value (in my case zero)
to flag undefined values.
Null values do seem to be supported for string data.
The following doesn't work for me. It causes the SQL exception "data is
not in the correct format."
int spid = MyGetSPID (transaction);
log4net.GlobalContext.Properties["spid"] = spid;
transaction.Commit();
EventLog.Info ("Database Updated");
log4net.GlobalContext.Properties["spid"] = null;
//log4net.GlobalContext.Properties.Remove("spid") also doesn't work.
Instead I have to use the following:
const int UNDEFINED_VALUE = 0;
int spid = MyGetSPID (transaction);
log4net.GlobalContext.Properties["spid"] = spid;
transaction.Commit();
EventLog.Info ("Database Updated");
log4net.GlobalContext.Properties["spid"] = UNDEFINED_VALUE;
My config file includes the following:
<commandText value="INSERT INTO EventLog ([Date], ..., [SPID]) VALUES
(@date, ..., @spid)" /> <parameter>
<parameterName value="@date" />
<dbType value="DateTime" />
<layout type="log4net.Layout.PatternLayout"
value="%date{yyyy'-'MM'-'dd HH':'mm':'ss'.'fff}" /> </parameter>
...
<parameter>
<parameterName value="@spid" />
<dbType value="Int32" />
<layout type="log4net.Layout.PatternLayout"
value="%property{spid}" /> </parameter>
My table includes the following:
CREATE TABLE EventLog
(
[ID] [int] IDENTITY (1, 1) NOT NULL ,
[Date] [datetime] NOT NULL ,
...
[SPID] [int]
)
How do I get log4net to handle null integer values?
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