mysql c-api 预处理语句

stmt = mysql_stmt_init(mysql)
mysql_stmt_prepare(stmt, "SELECT ?", strlen("SELECT ?"))
mysql_stmt_bind_param(stmt, param_bind)
mysql_stmt_execute(stmt)
mysql_stmt_bind_result(stmt, result_bind)
mysql_stmt_store_result(stmt)
while (!mysql_stmt_fetch(stmt))
mysql_stmt_close(stmt)

stmt = mysql_stmt_init(mysql);
mysql_stmt_prepare(stmt, "delete from aaa", strlen("delete from aaa"));
mysql_stmt_bind_param(stmt, bind)
mysql_stmt_execute(stmt) //修改bind的变量，可执行多次
mysql_stmt_execute(stmt)
mysql_stmt_execute(stmt)
mysql_stmt_affected_rows(stmt)