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Are SqlHelper static methods in Microsoft.Appli cationBlocks.Da ta not thread saft?

Dear all,
I am using Microsoft.Appli cationBlocks.Da ta, for one thing I am not quite sure.
Is the following static SqlHelper ExecuteReader method from source codes not thread saft in
multithread environment?
Do we need to use lock or monitor to protect our data in the static method
in multithread environment?
Do the following codes have the reentry problem in multithread environment because
I have threads that use SqlHelper to get data from MSSQL?

public static SqlDataReader ExecuteReader(S qlConnection connection,
SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[]
commandParamete rs, SqlConnectionOw nership connectionOwner ship)
if( connection == null ) throw new ArgumentNullExc eption( "connection " );
bool mustCloseConnec tion = false;
// Create a command and prepare it for execution
SqlCommand cmd = new SqlCommand();
PrepareCommand( cmd, connection, transaction, commandType, commandText, commandParamete rs,
out mustCloseConnec tion );
// Create a reader
SqlDataReader dataReader;
// Call ExecuteReader with the appropriate CommandBehavior
if (connectionOwne rship == SqlConnectionOw nership.Externa l)
dataReader = cmd.ExecuteRead er();
dataReader = cmd.ExecuteRead er(CommandBehav ior.CloseConnec tion);
// Detach the SqlParameters from the command object, so they can be used again.
// HACK: There is a problem here, the output parameter values are fletched
// when the reader is closed, so if the parameters are detached from the command
// then the SqlReader canæ„’ set its values.
// When this happen, the parameters canæ„’ be used again in other command.
bool canClear = true;
foreach(SqlPara meter commandParamete r in cmd.Parameters)
if (commandParamet er.Direction != ParameterDirect ion.Input)
canClear = false;

if (canClear)
cmd.Parameters. Clear();
return dataReader;
if( mustCloseConnec tion )
connection.Clos e();

Nov 16 '05 #1
0 1653

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