public static void Write(MySqlStreamWriter writer, uint stmtId, MyStructData[] _prepareValues)
{
//for those who don't want to alloc an new packet
//just write it into a stream
writer.ReserveHeader();
writer.WriteByte((byte)Command.STMT_EXECUTE);
writer.WriteUnsignedNumber(4, stmtId);
writer.WriteByte((byte)CursorFlags.CURSOR_TYPE_NO_CURSOR);
writer.WriteUnsignedNumber(4, 1);//iteration-count, always 1
//write NULL-bitmap, length: (num-params+7)/8
MyStructData[] fillValues = _prepareValues;
int paramNum = _prepareValues.Length;
if (paramNum > 0)
{
uint bitmap = 0;
uint bitValue = 1;
for (int i = 0; i < paramNum; i++)
{
MySqlDataType dataType = _prepareValues[i].type;
if (dataType == MySqlDataType.NULL)
{
bitmap += bitValue;
}
bitValue <<= 1; //shift to left 1 bit
if (bitValue == 256)
{
//end of 8 bits
//just store data
writer.WriteUnsigned1(bitmap);
bitmap = 0;
bitValue = 1;
}
}
if (bitValue != 1)
{
writer.WriteUnsigned1(bitmap);
}
}
//new-params-bound - flag
writer.WriteByte(1);
//-------------------------------------------------------
//data types
for (int i = 0; i < paramNum; i++)
{
writer.WriteUnsignedNumber(2, (byte)_prepareValues[i].type);
}
//--------------------------------------
//actual data
//--------------------------------------
//stream of data may large than 1 packet
var tempSingleValueHolder = new TempSingleValueHolder();
tempSingleValueHolder.headerLenBuffer = new byte[9];
tempSingleValueHolder.generalContent = new byte[16];
for (int i = 0; i < paramNum; i++)
{
bool isComplete = WriteValueByType(writer, ref _prepareValues[i], ref tempSingleValueHolder);
var header = new PacketHeader(writer.OnlyPacketContentLength, writer.IncrementPacketNumber());
writer.WriteHeader(header);
//--------------------------------------------------------------------------------------------------
while (!isComplete)
{
//write until complete
tempSingleValueHolder.round++;
writer.ReserveHeader();
isComplete = WriteValueByType(writer, ref _prepareValues[i], ref tempSingleValueHolder);
header = new PacketHeader(writer.OnlyPacketContentLength, writer.IncrementPacketNumber());
writer.WriteHeader(header);
}
//reset
tempSingleValueHolder.Reset();
}
//--------------------------------------
}
//----------------------------
static bool WriteValueByType(MySqlStreamWriter writer,
ref MyStructData dataTemp,
ref TempSingleValueHolder singleValueHolder)
{
int availableContentSpace = Packet.MAX_PACKET_LENGTH - (int)writer.OnlyPacketContentLength;
if (singleValueHolder.round == 0)
{
//---------------------------
//this is first round ***
//---------------------------
switch (dataTemp.type)
{
case MySqlDataType.NULL:
//we not write null data
return true;
case MySqlDataType.BIT:
case MySqlDataType.BLOB:
case MySqlDataType.MEDIUM_BLOB:
case MySqlDataType.LONG_BLOB:
//writer.WriteLengthCodedBuffer(dataTemp.myBuffer);
//this is first round
singleValueHolder.isBufferOrString = true;
singleValueHolder.bufferContent = dataTemp.myBuffer;
singleValueHolder.contentLen = singleValueHolder.bufferContent.Length;
//generate output
singleValueHolder.encodedLengthLen = writer.GenerateEncodeLengthNumber(singleValueHolder.contentLen, singleValueHolder.headerLenBuffer);
if (availableContentSpace > singleValueHolder.TotalLength)
{
//write in first round
writer.WriteLengthCodedBuffer(singleValueHolder.bufferContent);
return true;
}
//go below
break;
case MySqlDataType.VARCHAR:
case MySqlDataType.VAR_STRING:
case MySqlDataType.STRING:
{
//this is first round
singleValueHolder.isBufferOrString = true;
singleValueHolder.bufferContent = Encoding.UTF8.GetBytes(dataTemp.myString);
singleValueHolder.contentLen = singleValueHolder.bufferContent.Length;
//generate output
singleValueHolder.encodedLengthLen = writer.GenerateEncodeLengthNumber(singleValueHolder.contentLen, singleValueHolder.headerLenBuffer);
if (availableContentSpace > singleValueHolder.TotalLength)
{
//write in first round
writer.WriteLengthCodedBuffer(singleValueHolder.bufferContent);
return true;
}
//go below
}
break;
case MySqlDataType.TINY:
//if we can write in 1st round
if (availableContentSpace > 1)
{
writer.WriteUnsignedNumber(1, dataTemp.myUInt32);
return true;
}
else
{
//go below
MySqlStreamWriter.WriteUnsignedNumber(1, dataTemp.myUInt32, singleValueHolder.generalContent);
}
break;
case MySqlDataType.SHORT:
if (availableContentSpace > 2)
{
writer.WriteUnsignedNumber(2, dataTemp.myUInt32);
return true;
}
else
{
MySqlStreamWriter.WriteUnsignedNumber(2, dataTemp.myUInt32, singleValueHolder.generalContent);
}
break;
case MySqlDataType.LONG:
if (availableContentSpace > 4)
{
writer.WriteUnsignedNumber(4, dataTemp.myUInt32);
return true;
}
else
{
MySqlStreamWriter.WriteUnsignedNumber(4, dataTemp.myUInt32, singleValueHolder.generalContent);
//go below
}
break;
case MySqlDataType.LONGLONG:
if (availableContentSpace > 8)
{
writer.WriteInt64(dataTemp.myInt64);
return true;
}
else
{
//go below
MySqlStreamWriter.Write(dataTemp.myInt64, singleValueHolder.generalContent);
}
break;
case MySqlDataType.FLOAT:
if (availableContentSpace > 4)
{
writer.WriteFloat((float)dataTemp.myDouble);
return true;
}
else
{
//go below
MySqlStreamWriter.Write((float)dataTemp.myDouble, singleValueHolder.generalContent);
}
break;
case MySqlDataType.DOUBLE:
if (availableContentSpace > 8)
{
writer.WriteDouble(dataTemp.myDouble);
return true;
}
else
{
//go below
MySqlStreamWriter.Write(dataTemp.myDouble, singleValueHolder.generalContent);
}
break;
default:
//TODO: review here
throw new NotSupportedException();
//writer.WriteLengthCodedNull();
}
}
//----------------------------------------------------------------------------------------------------------
if (singleValueHolder.isBufferOrString)
{
//write encoded len & data
//check if we write complete header or not
if (singleValueHolder.encodedLengthBufferWriteIndex < singleValueHolder.encodedLengthLen)
{
//can we write complete encoded length header here?
int remaining = singleValueHolder.encodedLengthLen - singleValueHolder.encodedLengthBufferWriteIndex;
if (availableContentSpace > remaining)
{
for (int i = 0; i < remaining; ++i)
{
writer.WriteByte(singleValueHolder.headerLenBuffer[singleValueHolder.encodedLengthBufferWriteIndex]);
singleValueHolder.encodedLengthBufferWriteIndex++;
}
availableContentSpace -= remaining;
}
else if (availableContentSpace == remaining)
{
//TODO: review here
throw new NotSupportedException();
//we can write only header ***
for (int i = 0; i < remaining; ++i)
{
writer.WriteByte(singleValueHolder.headerLenBuffer[singleValueHolder.encodedLengthBufferWriteIndex]);
singleValueHolder.encodedLengthBufferWriteIndex++;
}
availableContentSpace -= remaining;
}
else
{
//can't complete encoded length here in this step
for (int i = 0; i < availableContentSpace; ++i)
{
writer.WriteByte(singleValueHolder.headerLenBuffer[singleValueHolder.encodedLengthBufferWriteIndex]);
singleValueHolder.encodedLengthBufferWriteIndex++;
}
return false;
}
}
//---------------
//write the body
int remainBodyLen = singleValueHolder.contentLen - singleValueHolder.contentStart;
if (availableContentSpace > remainBodyLen)
{
//write buffer
//we use bufferContent ****
writer.WriteBuffer(singleValueHolder.bufferContent, singleValueHolder.contentStart, remainBodyLen);
singleValueHolder.contentStart += remainBodyLen;
return true;
}
else if (availableContentSpace == remainBodyLen)
{
//TODO: review here
throw new NotSupportedException();
//this needs last packet with 0 byte content size ***
writer.WriteBuffer(singleValueHolder.generalContent, singleValueHolder.contentStart, remainBodyLen);
singleValueHolder.contentStart += remainBodyLen;
return false;
}
else
{
//write buffer
//we use bufferContent ****
writer.WriteBuffer(singleValueHolder.bufferContent, singleValueHolder.contentStart, availableContentSpace);
singleValueHolder.contentStart += availableContentSpace;
return false;
}
}
else
{
//---------------
//write the body
int remainBodyLen = singleValueHolder.contentLen - singleValueHolder.contentStart;
if (availableContentSpace > remainBodyLen)
{
//write buffer
//we use generalContent ****
writer.WriteBuffer(singleValueHolder.generalContent, singleValueHolder.contentStart, remainBodyLen);
singleValueHolder.contentStart += remainBodyLen;
return true;
}
else if (availableContentSpace == remainBodyLen)
{
//TODO: review here
throw new NotSupportedException();
//this needs last packet with 0 byte content size ***
writer.WriteBuffer(singleValueHolder.generalContent, singleValueHolder.contentStart, remainBodyLen);
singleValueHolder.contentStart += remainBodyLen;
return false;
}
else
{
//write buffer
//we use generalContent ****
writer.WriteBuffer(singleValueHolder.generalContent, singleValueHolder.contentStart, availableContentSpace);
singleValueHolder.contentStart += availableContentSpace;
return false;
}
}
}
