Data transmission method and apparatus

A data transmission apparatus, applied to a sending end, comprising:

• a memory and a processor;
• wherein the memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions, when the computer executable instructions are executed by the processor to cause the processor to:
• send first preset number of sub data packets to a receiving end;
• set data information of a first sub data packet in initial sending status information to obtain first sending status information, and construct an association relationship between the first sending status information and a corresponding field in a sending information maintenance table, wherein the sending information maintenance table comprises a second preset number of fields, and the first sub data packet is any sub data packet in the first preset number of sub data packets;
• and
• in a case that confirmation information returned by the receiving end is received, determine a second sub data packet corresponding to the confirmation information, and determine second sending status information corresponding to the second sub data packet, and remove an association relationship between the second sending status information and a corresponding field in the sending information maintenance table, wherein the second sub data packet is a sub data packet for which the confirmation information is returned by the receiving end in the first preset number of sub data packets.