MySQL  8.0.19
Source Code Documentation
COM_STMT_SEND_LONG_DATA

Sends the data for a parameter.

Repeating to send it, appends the data to the parameter.

No response is sent back to the client

Returns
None
Payload
TypeNameDescription
int<1> status [0x18] COM_STMT_SEND_LONG_DATA
int<4> statement_id ID of the statement
int<2> param_id The parameter to supply data to
binary<var> data The actual payload to send
Note
COM_STMT_SEND_LONG_DATA has to be sent before COM_STMT_EXECUTE