protected override object ReadNext()
{
if (_nullMap.IsNull(CurrentField))
{
return(DBNull.Value);
}
NpgsqlRowDescription.FieldData field_descr = FieldData;
Int32 field_value_size = PGUtil.ReadInt32(Stream) - 4;
byte[] buffer = new byte[field_value_size];
PGUtil.CheckedStreamRead(Stream, buffer, 0, field_value_size);
char[] charBuffer = new char[UTF8Encoding.GetCharCount(buffer, 0, buffer.Length)];
UTF8Encoding.GetChars(buffer, 0, buffer.Length, charBuffer, 0);
try
{
return
(NpgsqlTypesHelper.ConvertBackendStringToSystemType(field_descr.TypeInfo, new string(charBuffer),
field_descr.TypeSize, field_descr.TypeModifier));
}
catch (InvalidCastException ice)
{
return(ice);
}
catch (Exception ex)
{
return(new InvalidCastException(ex.Message, ex));
}
}
protected override object ReadNext()
{
int fieldSize = GetThisFieldCount();
if (fieldSize >= _messageSize)
{
AbandonShip();
}
_nextFieldSize = null;
// Check if this field is null
if (fieldSize == -1) // Null value
{
return(DBNull.Value);
}
NpgsqlRowDescription.FieldData field_descr = FieldData;
if (fieldSize >= 85000)
{
return(ReadLargeObject(field_descr, fieldSize));
}
byte[] buffer = new byte[fieldSize];
PGUtil.CheckedStreamRead(Stream, buffer, 0, fieldSize);
try
{
if (field_descr.FormatCode == FormatCode.Text)
{
var str = UTF8Encoding.GetString(buffer);
return
(NpgsqlTypesHelper.ConvertBackendStringToSystemType(
field_descr.TypeInfo,
str,
field_descr.TypeSize,
field_descr.TypeModifier));
}
else
{
return
(NpgsqlTypesHelper.ConvertBackendBytesToSystemType(
field_descr.TypeInfo,
buffer,
fieldSize,
field_descr.TypeModifier));
}
}
catch (InvalidCastException ice)
{
return(ice);
}
catch (Exception ex)
{
return(new InvalidCastException(ex.Message, ex));
}
}
private object ReadLargeObject(NpgsqlRowDescription.FieldData field_descr, int field_value_size)
{
var cms = new ChunkedMemoryStream(Stream, field_value_size);
try
{
return
(NpgsqlTypesHelper.ConvertBackendStringToSystemType(
field_descr.TypeInfo,
new StreamReader(cms, Encoding.UTF8),
field_descr.TypeSize,
field_descr.TypeModifier));
}
catch (InvalidCastException ice)
{
return(ice);
}
catch (Exception ex)
{
return(new InvalidCastException(ex.Message, ex));
}
}
protected override object ReadNext()
{
if (_nullMap.IsNull(CurrentField))
{
return(DBNull.Value);
}
NpgsqlRowDescription.FieldData field_descr = FieldData;
Int32 field_value_size = PGUtil.ReadInt32(Stream) - 4;
if (field_value_size >= 85000)
{
return(ReadLargeObject(field_descr, field_value_size));
}
byte[] buffer = new byte[field_value_size];
PGUtil.CheckedStreamRead(Stream, buffer, 0, field_value_size);
var str = UTF8Encoding.GetString(buffer);
try
{
return
(NpgsqlTypesHelper.ConvertBackendStringToSystemType(
field_descr.TypeInfo,
str,
field_descr.TypeSize,
field_descr.TypeModifier));
}
catch (InvalidCastException ice)
{
return(ice);
}
catch (Exception ex)
{
return(new InvalidCastException(ex.Message, ex));
}
}
private void PrepareInternal()
{
if (m_Connector.BackendProtocolVersion == ProtocolVersion.Version2)
{
planName = Connector.NextPlanName();
preparedCommandText = GetCommandText(true, false);
ExecuteBlind(m_Connector, preparedCommandText);
prepared = PrepareStatus.V2Prepared;
// Tell to mediator what command is being sent.
m_Connector.Mediator.SetSqlSent(preparedCommandText, NpgsqlMediator.SQLSentType.Prepare);
}
else
{
// Use the extended query parsing...
planName = m_Connector.NextPlanName();
String portalName = "";
preparedCommandText = GetCommandText(true, true);
NpgsqlParse parse = new NpgsqlParse(planName, preparedCommandText, new Int32[] { });
NpgsqlDescribe statementDescribe = new NpgsqlDescribeStatement(planName);
IEnumerable <IServerResponseObject> responseEnum;
NpgsqlRowDescription returnRowDesc = null;
// Write Parse, Describe, and Sync messages to the wire.
m_Connector.Parse(parse);
m_Connector.Describe(statementDescribe);
m_Connector.Sync();
// Tell to mediator what command is being sent.
m_Connector.Mediator.SetSqlSent(preparedCommandText, NpgsqlMediator.SQLSentType.Parse);
// Flush and wait for response.
responseEnum = m_Connector.ProcessBackendResponsesEnum();
// Look for a NpgsqlRowDescription in the responses, discarding everything else.
foreach (IServerResponseObject response in responseEnum)
{
if (response is NpgsqlRowDescription)
{
returnRowDesc = (NpgsqlRowDescription)response;
}
else if (response is IDisposable)
{
(response as IDisposable).Dispose();
}
}
Int16[] resultFormatCodes;
if (returnRowDesc != null)
{
resultFormatCodes = new Int16[returnRowDesc.NumFields];
for (int i = 0; i < returnRowDesc.NumFields; i++)
{
NpgsqlRowDescription.FieldData returnRowDescData = returnRowDesc[i];
if (returnRowDescData.TypeInfo != null)
{
// Binary format?
// PG always defaults to text encoding. We can fix up the row description
// here based on support for binary encoding. Once this is done,
// there is no need to request another row description after Bind.
returnRowDescData.FormatCode = returnRowDescData.TypeInfo.SupportsBinaryBackendData ? FormatCode.Binary : FormatCode.Text;
resultFormatCodes[i] = (Int16)returnRowDescData.FormatCode;
}
else
{
// Text format (default).
resultFormatCodes[i] = (Int16)FormatCode.Text;
}
}
}
else
{
resultFormatCodes = new Int16[] { 0 };
}
// Save the row description for use with all future Executes.
currentRowDescription = returnRowDesc;
// The Bind and Execute message objects live through multiple Executes.
// Only Bind changes at all between Executes, which is done in BindParameters().
bind = new NpgsqlBind(portalName, planName, new Int16[Parameters.Count], null, resultFormatCodes);
execute = new NpgsqlExecute(portalName, 0);
prepared = PrepareStatus.V3Prepared;
}
}
