private static void RunTestIteration(SqlConnection con, SqlRandomizer rand, SqlRandomTable table, string tableName)
{
// random list of columns
int columnCount = table.Columns.Count;
int[] columnIndicies = rand.NextIndicies(columnCount);
int selectedCount = rand.NextIntInclusive(1, maxValueInclusive: columnCount);
StringBuilder selectBuilder = new StringBuilder();
table.GenerateSelectFromTableTSql(tableName, selectBuilder, columnIndicies, 0, selectedCount);
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = selectBuilder.ToString();
bool cancel = rand.Next(100) == 0; // in 1% of the cases, call Cancel
if (cancel)
{
int cancelAfterMilliseconds = rand.Next(5);
int cancelAfterSpinCount = rand.Next(1000);
ThreadPool.QueueUserWorkItem((object state) =>
{
for (int i = 0; cancel && i < cancelAfterMilliseconds; i++)
{
Thread.Sleep(1);
}
if (cancel && cancelAfterSpinCount > 0)
{
SpinWait.SpinUntil(() => false, new TimeSpan(cancelAfterSpinCount));
}
if (cancel)
{
cmd.Cancel();
}
});
}
int readerRand = rand.NextIntInclusive(0, maxValueInclusive: 256);
CommandBehavior readerBehavior = CommandBehavior.Default;
if (readerRand % 10 == 0)
readerBehavior = CommandBehavior.SequentialAccess;
try
{
using (SqlDataReader reader = cmd.ExecuteReader(readerBehavior))
{
int row = 0;
while (reader.Read())
{
int rowRand = rand.NextIntInclusive();
if (rowRand % 1000 == 0)
{
// abandon this reader
break;
}
else if (rowRand % 25 == 0)
{
// skip the row
row++;
continue;
}
IList<object> expectedRow = table[row];
for (int c = 0; c < reader.FieldCount; c++)
{
if (rand.NextIntInclusive(0, maxValueInclusive: 10) == 0)
{
// skip the column
continue;
}
int expectedTableColumn = columnIndicies[c];
object expectedValue = expectedRow[expectedTableColumn];
if (table.Columns[expectedTableColumn].CanCompareValues)
{
Assert.True(expectedValue != null, "FAILED: Null is expected with CanCompareValues");
// read the value same way it was written
object actualValue = table.Columns[expectedTableColumn].Read(reader, c, expectedValue.GetType());
Assert.True(table.Columns[expectedTableColumn].CompareValues(expectedValue, actualValue),
string.Format("FAILED: Data Comparison Failure:\n{0}", table.Columns[expectedTableColumn].BuildErrorMessage(expectedValue, actualValue)));
}
}
row++;
}
}
// keep last - this will stop the cancel task, if it is still active
cancel = false;
}
catch (SqlException e)
{
if (!cancel)
throw;
bool expected = false;
foreach (SqlError error in e.Errors)
{
if (error.Message == _operationCanceledErrorMessage)
{
// ignore this one - expected if canceled
expected = true;
break;
}
else if (error.Message == _severeErrorMessage)
{
// A severe error occurred on the current command. The results, if any, should be discarded.
expected = true;
break;
}
}
if (!expected)
{
// rethrow to the user
foreach (SqlError error in e.Errors)
{
Console.WriteLine("{0} {1}", error.Number, error.Message);
}
throw;
}
}
catch (InvalidOperationException e)
{
bool expected = false;
if (e.Message == _operationCanceledErrorMessage)
{
// "Operation canceled" exception is raised as a SqlException (as one of SqlError objects) and as InvalidOperationException
expected = true;
}
if (!expected)
{
throw;
}
}
}