private void ReadParametersDataInput(RequestExecutionContext context)
{
var headers = context.RequestParameters;
var parsed = context.ParsedRequest;
var paramCount = headers.DataTypes.Length;
if (headers.IsCollectionFlags.Length != BitVector.GetArrayLength(paramCount))
{
throw new Exception(string.Format("BitVector for isCollection flags is broken"));
}
parsed.Params.Names = headers.Names;
parsed.Params.DataTypes = headers.DataTypes;
parsed.Params.OrdinalToLocalOrdinal = new int[headers.DataTypes.Length];
var collectionCount = 0;
var valueCount = 0;
for (var ordinal = 0; ordinal < paramCount; ordinal++)
{
var flag = BitVector.Get(headers.IsCollectionFlags, ordinal);
if (flag)
{
parsed.Params.OrdinalToLocalOrdinal[ordinal] = collectionCount;
collectionCount++;
}
else
{
parsed.Params.OrdinalToLocalOrdinal[ordinal] = valueCount;
valueCount++;
}
}
// collections are stored separately
if (collectionCount > 0)
{
parsed.Params.InputCollections = new object[collectionCount];
}
// single values are stored in an instance of DriverRowData
if (valueCount > 0)
{
var fieldTypesForValues = new DbType[valueCount];
for (var ordinal = 0; ordinal < headers.DataTypes.Length; ordinal++)
{
if (!BitVector.Get(headers.IsCollectionFlags, ordinal))
{
fieldTypesForValues[parsed.Params.OrdinalToLocalOrdinal[ordinal]] = headers.DataTypes[ordinal];
}
}
parsed.Params.InputValues = new DriverRowData(fieldTypesForValues);
}
parsed.Bulk.Attach(context.RequestMessage.Stream);
try
{
using (var reader = new BinaryReader(parsed.Bulk, Encoding.UTF8, true))
{
StringBuilder stringBuilder = null;
var notnulls = new int[BitVector.GetArrayLength(paramCount)];
BitVector.Read(notnulls, paramCount, reader);
for (var ordinal = 0; ordinal < paramCount; ordinal++)
{
var iscollection = BitVector.Get(headers.IsCollectionFlags, ordinal);
if (BitVector.Get(notnulls, ordinal))
{
var dbType = headers.DataTypes[ordinal];
if (stringBuilder == null &&
RowData.DeriveSystemType(dbType) == typeof(string))
{
stringBuilder = new StringBuilder();
}
// we have more than one destination, each storing a subset of input values
// so ordinals are different from "flat" zero-to-paramCount enumeration
var localOrdinal = parsed.Params.OrdinalToLocalOrdinal[ordinal];
if (iscollection)
{
parsed.Params.InputCollections[localOrdinal] = ReadCollection(dbType, reader, stringBuilder);
}
else
{
BitVector.Set(parsed.Params.InputValues.NotNulls, localOrdinal);
ReadPrimitiveValue(parsed.Params.InputValues, localOrdinal, reader, stringBuilder);
}
}
}
}
// client sets stream end marker after parameters data, make sure we read it
// otherwise subsequent bulk reader may fail
if (-1 != parsed.Bulk.ReadByte())
{
throw new Exception("Did not find the end of parameters data block when expected");
}
}
finally
{
parsed.Bulk.Detach();
}
}