学习MYSQL源码，从简单select 的call stack开始

eclipse debug运行mysqld

1、在innobase/handler/ha_innodb.cc 函数开头ha_innobase::index_read设置断点

2、debug运行mysqld

mysql客户端连上执行简单select

mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from t1;

可以看到在断点处中断，可以获取call stack，看到该断点处的上下文

call stack

ha_innobase::index_read() at ha_innodb.cc:8,660 0x191a558	
ha_innobase::index_first() at ha_innodb.cc:9,171 0x191b9e8	
ha_innobase::rnd_next() at ha_innodb.cc:9,269 0x191bc36	
handler::ha_rnd_next() at handler.cc:2,962 0xf345ef	
rr_sequential() at records.cc:517 0x1490802	
join_init_read_record() at sql_executor.cc:2,504 0x152c89b	
sub_select() at sql_executor.cc:1,284 0x152997f	
do_select() at sql_executor.cc:957 0x1529304	
JOIN::exec() at sql_executor.cc:206 0x15271c0	
handle_query() at sql_select.cc:191 0x15c409a	
execute_sqlcom_select() at sql_parse.cc:5,155 0x1578749	
mysql_execute_command() at sql_parse.cc:2,826 0x1571528	
mysql_parse() at sql_parse.cc:5,584 0x1579655	
dispatch_command() at sql_parse.cc:1,491 0x156e1b7	
do_command() at sql_parse.cc:1,032 0x156cff0	
handle_connection() at connection_handler_per_thread.cc:313 0x16a6619	
pfs_spawn_thread() at pfs.cc:2,197 0x1d56ac8	
start_thread() at 0x35d00079d1	
clone() at 0x35cfce8b6d	

thd->m_query_string 可以看到执行的SQL文本