private void RunTestIteration(SqlConnection con, SqlRandomizer rand, SqlRandomTable table, string tableName)
{
// random list of columns
int columnCount = table.Columns.Count;
int[] columnIndices = rand.NextIndices(columnCount);
int selectedCount = rand.NextIntInclusive(1, maxValueInclusive: columnCount);
StringBuilder selectBuilder = new StringBuilder();
table.GenerateSelectFromTableTSql(tableName, selectBuilder, columnIndices, 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 = columnIndices[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;
}
}
}
/// <summary>
/// Creates random list of columns from the given source collection. The rules are:
/// * table cannot contain more than 1024 non-sparse columns
/// * total row size of non-sparse columns should not exceed 8060 or 8018 (with sparse)
/// * column set column must be added if number of columns in total exceeds 1024
/// </summary>
public static SqlRandomTableColumn[] CreateRandTypes(SqlRandomizer rand, SqlRandomTypeInfoCollection sourceCollection, int maxColumnsCount, bool createIdColumn)
{
var retColumns = new List <SqlRandomTableColumn>(maxColumnsCount);
bool hasTimestamp = false;
double totalRowSize = 0;
int totalRegularColumns = 0;
bool hasColumnSet = false;
bool hasSparseColumns = false;
int maxRowSize = MaxBytesPerRow; // set to MaxBytesPerRowWithSparse when sparse column is first added
int i = 0;
if (createIdColumn)
{
SqlRandomTypeInfo keyType = sourceCollection[SqlDbType.Int];
SqlRandomTableColumn keyColumn = keyType.CreateDefaultColumn(SqlRandomColumnOptions.None);
retColumns.Add(keyColumn);
totalRowSize += keyType.GetInRowSize(keyColumn, null);
i++;
totalRegularColumns++;
}
for (; i < maxColumnsCount; i++)
{
// select column options (sparse/column-set)
bool isSparse; // must be set in the if/else flow below
bool isColumnSet = false;
if (totalRegularColumns >= MaxNonSparseColumns)
{
// reached the limit for regular columns
if (!hasColumnSet)
{
// no column-set yet, stop unconditionally
// this can happen if large char/binary value brought the row size total to a limit leaving no space for column-set
break;
}
// there is a column set, enforce sparse from this point
isSparse = true;
}
else if (i == (MaxNonSparseColumns - 1) && hasSparseColumns && !hasColumnSet)
{
// we almost reached the limit of regular & sparse columns with, but no column set added
// to increase chances for >1024 columns, enforce column set now
isColumnSet = true;
isSparse = false;
}
else if (totalRowSize > MaxBytesPerRowWithSparse)
{
Debug.Assert(totalRowSize <= MaxBytesPerRow, "size over the max limit");
Debug.Assert(!hasSparseColumns, "should not have sparse columns after MaxBytesPerRowWithSparse (check maxRowSize)");
// cannot insert sparse from this point
isSparse = false;
isColumnSet = false;
}
else
{
// check how close we are to the limit of the row size
int sparseProbability;
if (totalRowSize < 100)
{
sparseProbability = 2;
}
else if (totalRowSize < MaxBytesPerRowWithSparse / 2)
{
sparseProbability = 10;
}
else if (totalRowSize < (MaxBytesPerRowWithSparse - s_columnSetSafetyRange))
{
sparseProbability = 50;
}
else
{
// close to the row size limit, special case
if (!hasColumnSet)
{
// if we have not added column set column yet
// column-set is a regular column and its size counts towards row size, so time to add it
isColumnSet = true;
sparseProbability = -1; // not used
}
else
{
sparseProbability = 90;
}
}
if (!isColumnSet)
{
isSparse = (rand.Next(100) < sparseProbability);
if (!isSparse && !hasColumnSet)
{
// if decided to add regular column, give it a (low) chance to inject a column set at any position
isColumnSet = rand.Next(100) < 1;
}
}
else
{
isSparse = false;
}
}
// select the type
SqlRandomTypeInfo ti;
SqlRandomColumnOptions options = SqlRandomColumnOptions.None;
if (isSparse)
{
Debug.Assert(!isColumnSet, "should not have both sparse and column set flags set");
ti = sourceCollection.NextSparse(rand);
Debug.Assert(ti.CanBeSparseColumn, "NextSparse must return only types that can be sparse");
options |= SqlRandomColumnOptions.Sparse;
}
else if (isColumnSet)
{
Debug.Assert(!hasColumnSet, "there is already a column set, we should not set isColumnSet again above");
ti = sourceCollection[SqlDbType.Xml];
options |= SqlRandomColumnOptions.ColumnSet;
}
else
{
// regular column
ti = sourceCollection.Next(rand);
if (ti.Type == SqlDbType.Timestamp)
{
// while table can contain single timestamp column only, there is no way to insert values into it.
// thus, do not allow this
if (hasTimestamp || maxColumnsCount == 1)
{
ti = sourceCollection[SqlDbType.Int];
}
else
{
// table cannot have two timestamp columns
hasTimestamp = true;
}
}
}
SqlRandomTableColumn col = ti.CreateRandomColumn(rand, options);
if (!isSparse)
{
double rowSize = ti.GetInRowSize(col, DBNull.Value);
int overhead = GetRowOverhead(retColumns.Count + 1); // +1 for this column
if (totalRowSize + rowSize + overhead > maxRowSize)
{
// cannot use this column
// note that if this column is a column set column
continue;
}
totalRowSize += rowSize;
totalRegularColumns++;
}
// else - sparse columns are not counted towards row size when table is created (they are when inserting new row with non-null value in the sparse column)...
retColumns.Add(col);
// after adding the column, update the state
if (isColumnSet)
{
hasColumnSet = true;
}
if (isSparse)
{
hasSparseColumns = true;
maxRowSize = MaxBytesPerRowWithSparse; // reduce the max row size
}
}
return(retColumns.ToArray());
}