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mysql-source-code's Introduction

## 1、mysql的入口函数为sql/mysqld.cc文件的mysqld_main方法

## 2、mysql的解析函数为sql/sql_parse.cc文件的mysql_parse方法

## 3、mysql的执行命令函数为sql/sql_parse.cc文件的mysql_execute_command方法
### 3.1、打印线程命令:p thd->query()
### 3.1、执行命令的关键点
res= lex->m_sql_cmd->execute(thd);
Sql_cmd_dml::execute -> Sql_cmd_dml::execute_inner
JOIN::optimize -> JOIN::make_join_plan -> JOIN::extract_func_dependent_tables -> join_read_const_table
-> read_const -> handler::ha_index_read_idx_map -> handler::index_read_idx_map -> handler::index_read_map
-> ha_innobase::index_read -> row_search_mvcc -> sel_set_rec_lock -> lock_clust_rec_read_check_and_lock
-> lock_rec_lock

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