/// <summary>
///
/// </summary>
/// <param name="writer"></param>
/// <param name="sql"></param>
/// <returns></returns>
public static void Write(MySqlStreamWriter writer, string sql)
{
//for those who don't want to alloc an new packet
//just write it into a stream
byte[] buffer = writer.GetEncodeBytes(sql.ToCharArray());
int totalLen = buffer.Length;
int packetCount = (totalLen / Packet.MAX_PACKET_LENGTH) + 1;
if (packetCount <= 1)
{
writer.ReserveHeader();
writer.WriteByte((byte)Command.QUERY);
//check if we can write data in 1 packet or not
writer.WriteBinaryString(buffer);
var header = new PacketHeader(writer.OnlyPacketContentLength, writer.IncrementPacketNumber());
writer.WriteHeader(header);
}
else
{
//we need to split to multiple packet
int currentPacketContentSize = Packet.MAX_PACKET_LENGTH;
int pos = 0;
for (int i = 0; i < packetCount; ++i)
{
//write each packet to stream
writer.ReserveHeader();
if (i == 0)
{
//first packet
writer.WriteByte((byte)Command.QUERY);
writer.WriteBinaryString(buffer, pos, currentPacketContentSize - 1);//remove 1 query cmd
pos += (currentPacketContentSize - 1);
}
else if (i == packetCount - 1)
{
//last packet
currentPacketContentSize = totalLen - pos;
writer.WriteBinaryString(buffer, pos, currentPacketContentSize);
}
else
{
writer.WriteBinaryString(buffer, pos, currentPacketContentSize);
pos += (currentPacketContentSize);
}
//check if we can write data in 1 packet or not
var header = new PacketHeader((uint)currentPacketContentSize, writer.IncrementPacketNumber());
writer.WriteHeader(header);
}
}
}
void ExecuteNonPrepare_A(Action nextAction)
{
//abstract mysql packet
//----------------------------------------
// (4 bytes header)| ( user content)
//----------------------------------------
// 4 bytes header => 3 bytes for user content len (so max => (1 << 24) - 1 or 0xFF, 0xFF, 0xFF
// => 1 byte for packet number, so this value is 0-255
_sqlParserMx.UseResultParser();
_writer.Reset();//*** packet number is reset to 0
//---------------
//https://dev.mysql.com/doc/internals/en/mysql-packet.html
//If a MySQL client or server wants to send data, it:
//Splits the data into packets of size (2^24)−1 bytes
//Prepends to each chunk a packet header
byte[] buffer = _writer.GetEncodeBytes(_sqlStrTemplate.BindValues(_cmdParams, false).ToCharArray());
//---------------
int totalLen = buffer.Length;
//packet count
int packetCount = ((totalLen + Connection.MAX_PACKET_CONTENT_LENGTH) / Connection.MAX_PACKET_CONTENT_LENGTH);
#if DEBUG
if (packetCount >= 255)
{
throw new NotSupportedException();
}
#endif
if (packetCount <= 1)
{
//--------------------------------------------
//check SendIO buffer is large enough or not
//if not, handle this by asking for more buffer
//or throw error back to user
//--------------------------------------------
if (!_conn.EnsureSendIOBufferSize(totalLen))
{
//how to handle exception
//TODO: review here,
//we should not throw exception on working thread
throw new NotSupportedException();
}
//--------------------------------------------
_writer.ReserveHeader();
_writer.WriteByte((byte)Command.QUERY);
//check if we can write data in 1 packet or not
_writer.WriteBinaryString(buffer);
//var header = new PacketHeader(_writer.OnlyPacketContentLength, _writer.IncrementPacketNumber());
_writer.WriteHeader(_writer.OnlyPacketContentLength, _writer.IncrementPacketNumber());
//
SendAndRecv_A(_writer.ToArray(), nextAction);
}
else
{
//we need to split to multiple packet
//and we need max sendIO buffer
//--------------------------------------------
//check SendIO buffer is large enough or not
//if not, handle this by asking for more buffer
//or throw error back to user
//--------------------------------------------
if (!_conn.EnsureSendIOBufferSize(Connection.MAX_PACKET_CONTENT_LENGTH))
{
//how to handle exception
//TODO: review here,
//we should not throw exception on working thread
throw new NotSupportedException();
}
//--------------------------------------------
int currentPacketContentSize = Connection.MAX_PACKET_CONTENT_LENGTH;
int pos = 0;
for (int packet_num = 0; packet_num < packetCount; ++packet_num)
{
//write each packet to stream
_writer.ReserveHeader();
if (packet_num == 0)
{
//first packet
_writer.WriteByte((byte)Command.QUERY);
_writer.WriteBinaryString(buffer, pos, currentPacketContentSize - 1);//remove 1 query cmd
pos += (currentPacketContentSize - 1);
}
else if (packet_num == packetCount - 1)
{
//last packet
currentPacketContentSize = totalLen - pos;
_writer.WriteBinaryString(buffer, pos, currentPacketContentSize);
}
else
{
//in between
_writer.WriteBinaryString(buffer, pos, currentPacketContentSize);
pos += (currentPacketContentSize);
}
//--------------
//check if we can write data in 1 packet or not
//var header = new PacketHeader((uint)currentPacketContentSize, (byte)packet_num);//***
_writer.WriteHeader((uint)currentPacketContentSize, (byte)packet_num); //***
_conn.EnqueueOutputData(_writer.ToArray()); //enqueue output data
_writer.Reset();
}
_conn.StartSend(() =>
{
//when send complete then start recv result
RecvPacket_A(nextAction);
});
}
}
