COM_STMT_EXECUTE asks the server to execute a
prepared statement as identified by
It sends the values for the placeholders of the prepared statement (if it contained any) in Binary Protocol Value form. The type of each parameter is made up of two bytes:
the type as in
a flag byte which has the highest bit set if the type is unsigned 
num-params used for this packet has to
num_params of the
of the corresponding prepared statement.
The server returns a COM_STMT_EXECUTE Response.
COM_STMT_EXECUTE execute a prepared statement direction: client -> server response: COM_STMT_EXECUTE Response payload: 1  COM_STMT_EXECUTE 4 stmt-id 1 flags 4 iteration-count if num-params > 0: n NULL-bitmap, length: (num-params+7)/8 1 new-params-bound-flag if new-params-bound-flag == 1: n type of each parameter, length: num-params * 2 n value of each parameter example: 12 00 00 00 17 01 00 00 00 00 01 00 00 00 00 01 ................ 0f 00 03 66 6f 6f ...foo
iteration-count is always
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