{"id":311439,"date":"2024-01-18T17:28:37","date_gmt":"2024-01-18T09:28:37","guid":{"rendered":"https:\/\/www.idc.net\/help\/311439\/"},"modified":"2024-01-18T17:28:37","modified_gmt":"2024-01-18T09:28:37","slug":"mysql%e6%ba%90%e7%a0%81%e5%ad%a6%e4%b9%a0%e4%b9%8bconnection-manager%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/311439\/","title":{"rendered":"MySQL\u6e90\u7801\u5b66\u4e60\u4e4bConnection Manager\u8be6\u89e3"},"content":{"rendered":"

MySQL<\/strong>\u6570\u636e\u5e93Connection Manager<\/strong>\u7684\u76f8\u5173\u77e5\u8bc6\u662f\u672c\u6587\u6211\u4eec\u4e3b\u8981\u8981\u4ecb\u7ecd\u5230\u5185\u5bb9\uff0c\u63a5\u4e0b\u6765\u5c31\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u4e86\u89e3\u4e00\u4e0b\u5427\u3002<\/p>\n

1.\u8fde\u63a5\u7684\u7ebf\u7a0b\u6570<\/strong><\/p>\n

MySQL\u652f\u6301\u5355\u7ebf\u7a0b\u548c\u591a\u7ebf\u7a0b\u4e24\u79cd\u8fde\u63a5\u7ebf\u7a0b\u6570\u3002\u5982\u679c\u662f\u5355\u7ebf\u7a0b\uff0c\u5219\u5728\u540c\u4e00\u65f6\u523b\uff0c\u53ea\u80fd\u6709\u4e00\u4e2aconnection\u8fde\u63a5\u5230MySQL,\u5176\u4ed6\u7684\u8fde\u63a5\u4f1a\u88ab\u6302\u8d77\u3002\u5982\u679c\u662f\u591a\u7ebf\u7a0b\uff0c\u5219\u540c\u4e00\u65f6\u523b\u53ef\u4ee5\u652f\u6301\u591a\u4e2aconnection\u540c\u65f6\u8fde\u63a5\u5230\u670d\u52a1\u5668\u3002\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u670d\u52a1\u5668\u7684\u542f\u52a8\u53c2\u6570\u6765\u8bbe\u5b9a\u8fde\u63a5\u7684\u7ebf\u7a0b\u6570\uff1a<\/p>\n

\n \n \n 
    \n  \n  \n  
  1. mysqld.exe <\/span>--thread-handling<\/span>=<\/span>no<\/span>-threads  <\/span><\/span><\/li>\n  \n  \n  
  2. mysqld.exe <\/span>--thread-handling<\/span>=<\/span>one<\/span>-thread-per-connection <\/span><\/li>\n \n \n <\/ol><\/pre>\n
     <\/p>\n
    \u670d\u52a1\u5668\u5982\u4f55\u901a\u8fc7\u53c2\u6570\u6765\u9009\u62e9\u4f7f\u7528\u54ea\u79cd\u65b9\u5f0f\u7684\u5462\uff1f\u4e14\u770b\u670d\u52a1\u5668\u4e2d\u7684\u5206\u652f\u4ee3\u7801\uff1a<\/p>\n
    \n \n \n 
      \n  \n  \n  
    1. #ifdef EMBEDDED_LIBRARY  <\/span><\/span><\/li>\n  \n  \n  
    2. one_thread_scheduler(&thread_scheduler);  <\/span><\/li>\n  \n  \n  
    3. #else  <\/span><\/li>\n  \n  \n  
    4. if (global_system_variables.thread_handling <\/span><<\/span>=  <\/span><\/li>\n  \n  \n  
    5. SCHEDULER_ONE_THREAD_PER_CONNECTION)  <\/span><\/li>\n  \n  \n  
    6. one_thread_per_connection_scheduler(&thread_scheduler);  <\/span><\/li>\n  \n  \n  
    7. else if (<\/span>global_system_variables.thread_handling<\/span> == SCHEDULER_NO_THREADS)  <\/span><\/li>\n  \n  \n  
    8. one_thread_scheduler(&thread_scheduler);  <\/span><\/li>\n  \n  \n  
    9. else  <\/span><\/li>\n  \n  \n  
    10. pool_of_threads_scheduler(&thread_scheduler); \/* purecov: tested *\/  <\/span><\/li>\n  \n  \n  
    11. #endif <\/span><\/li>\n \n \n <\/ol><\/pre>\n
       <\/p>\n
      \u8fd9\u6bb5\u4ee3\u7801\u51fa\u73b0\u5728get_options\u51fd\u6570\u4e2d\uff0c\u6b64\u51fd\u6570\u662f\u6839\u636e\u4f20\u5165\u7684\u670d\u52a1\u5668\u53c2\u6570\uff0c\u8bbe\u7f6e\u76f8\u5e94\u53c2\u6570\u7684\u6a21\u5f0f\u3002\u7531\u8fd9\u6bb5\u4ee3\u7801\u53ef\u4ee5\u770b\u51fa\uff0c\u5982\u679c\u5b9a\u4e49\u4e86EMBEDDED_LIBRARY\u5b8f\u5b9a\u4e49(\u4f30\u8ba1\u5e94\u8be5\u662f\u5d4c\u5165\u5f0f\u4f7f\u7528)\uff0c\u5219\u8c03\u7528one_thread_scheduler\uff0c\u5373\u4f7f\u7528\u5355\u7ebf\u7a0b\u3002\u5982\u679c\u53c2\u6570\u5c0f\u4e8e\u7b49\u4e8eSCHEDULER_ONE_THREAD_PER_CONNECTION\uff0c\u5219\u8c03\u7528one_thread_per_connection_scheduler\uff0c\u5373\u6bcf\u4e2a\u8fde\u63a5\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5373\u591a\u7ebf\u7a0b\u3002<\/p>\n
      \u81f3\u4e8eglobal_system_variables.thread_handling\u662f\u5982\u4f55\u8fdb\u884c\u8bbe\u7f6e\u7684\u5462\uff1f\u5176\u5b9e\u5c31\u662f\u6839\u636e\u6211\u4eec\u4f20\u9012\u7ed9\u670d\u52a1\u5668\u7684\u53c2\u6570--thread-handling\u8fdb\u884c\u8bbe\u7f6e\u7684\uff0c\u53c2\u6570\u7684\u8bbe\u7f6e\u7edf\u4e00\u5728\u51fd\u6570get_options\u4e2d\uff0c\u5176\u8c03\u7528mysqld_get_one_option\uff0c\u5176\u4e2d\u6709\u4e2a\u5206\u652f\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
       <\/p>\n
      \n \n \n 
        \n  \n  \n  
      1. case OPT_THREAD_HANDLING:  <\/span><\/span><\/li>\n  \n  \n  
      2. {  <\/span><\/li>\n  \n  \n  
      3. global_system_variables.thread_handling<\/span>=  <\/span><\/li>\n  \n  \n  
      4. find_type_or_exit<\/span>(argument, &thread_handling_typelib, opt-<\/span>><\/span>name)-1;  <\/span><\/li>\n  \n  \n  
      5. break;  <\/span><\/li>\n  \n  \n  
      6. } <\/span><\/li>\n \n \n <\/ol><\/pre>\n
         <\/p>\n
        \u5bf9\u53c2\u6570\u521d\u59cb\u5316\u6709\u5174\u8da3\u7684\u53ef\u4ee5\u5177\u4f53\u7684\u770b\u4e0bget_options\u8fd9\u4e2a\u51fd\u6570\uff0c\u8fd9\u91cc\u5c31\u4e0d\u8be6\u7ec6\u8bb2\u89e3\u4e86\u3002 \u6211\u4eec\u6765\u770b\u4e0bone_thread_scheduler\u548cone_thread_per_connection_scheduler\u7684\u6e90\u4ee3\u7801\uff0c\u770b\u4e0b\u4ed6\u4eec\u90fd\u505a\u4e86\u4e9b\u4ec0\u4e48\uff1f<\/p>\n
         <\/p>\n
        \n \n \n 
          \n  \n  \n  
        1. void one_thread_scheduler(scheduler_functions* func)  <\/span><\/span><\/li>\n  \n  \n  
        2. {  <\/span><\/li>\n  \n  \n  
        3. func-<\/span>><\/span>max_threads<\/span>= <\/span>1<\/span>;  <\/span><\/li>\n  \n  \n  
        4. #ifndef EMBEDDED_LIBRARY  <\/span><\/li>\n  \n  \n  
        5. func-<\/span>><\/span>add_connection<\/span>= <\/span>handle_connection_in_main_thread<\/span>;  <\/span><\/li>\n  \n  \n  
        6. #endif  <\/span><\/li>\n  \n  \n  
        7. func-<\/span>><\/span>init_new_connection_thread<\/span>= <\/span>init_dummy<\/span>;  <\/span><\/li>\n  \n  \n  
        8. func-<\/span>><\/span>end_thread<\/span>= <\/span>no_threads_end<\/span>;  <\/span><\/li>\n  \n  \n  
        9. }  <\/span><\/li>\n  \n  \n  
        10.  <\/span><\/li>\n  \n  \n  
        11. void one_thread_per_connection_scheduler(scheduler_functions* func)  <\/span><\/li>\n  \n  \n  
        12. {  <\/span><\/li>\n  \n  \n  
        13. func-<\/span>><\/span>max_threads<\/span>= <\/span>max_connections<\/span>;  <\/span><\/li>\n  \n  \n  
        14. func-<\/span>><\/span>add_connection<\/span>= <\/span>create_thread_to_handle_connection<\/span>;  <\/span><\/li>\n  \n  \n  
        15. func-<\/span>><\/span>end_thread<\/span>= <\/span>one_thread_per_connection_end<\/span>;  <\/span><\/li>\n  \n  \n  
        16. }  <\/span><\/li>\n \n \n <\/ol><\/pre>\n
           <\/p>\n
          \u539f\u6765\u5c31\u662f\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u7ed3\u6784\u4f53\u4e2dscheduler_functions\u7684\u53c2\u6570\uff0c\u53ea\u4e0d\u8fc7\u8fd9\u4e9b\u53c2\u6570\u662f\u4e00\u4e9b\u51fd\u6570\u6307\u9488\u7f62\u4e86\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728\u5177\u4f53\u7684\u8c03\u7528\u4e2d\uff0c<\/p>\n
          \u53ea\u9700\u8981\u8c03\u7528add_connection\u6216end_thread\u5373\u53ef\uff0c\u4e0d\u9700\u8981\u77e5\u9053\u5230\u5e95\u662f\u8c03\u7528\u4e86\u54ea\u4e2a\u51fd\u6570\uff0c\u8fd9\u5927\u6982\u5c31\u662f\u4e00\u79cd\u53d8\u5f62\u7684\u591a\u6001\u6027\u5427\u3002<\/p>\n
          2.\u521d\u59cb\u5316\u7f51\u7edc\u914d\u7f6e<\/strong><\/p>\n
          \u7f51\u7edc\u914d\u7f6e\u6bd4\u8f83\u7b80\u5355\uff0c\u5c31\u662f\u8bbe\u7f6e\u7aef\u53e3\uff0c\u521b\u5efa\u5957\u63a5\u5b57\uff0c\u7ed1\u5b9a\u7aef\u53e3\uff0c\u76d1\u542c\u7aef\u53e3\u3002\u5b9e\u73b0\u5168\u90e8\u96c6\u4e2d\u5728network_init\u51fd\u6570\u4e2d\uff0c\u7531\u4e8e\u8fd9\u4e2a\u51fd\u6570\u786e<\/p>\n
          \u5b9e\u6ca1\u4ec0\u4e48\u597d\u8bb2\u7684\uff0c\u5982\u679c\u5bf9socket\u4e0d\u719f\u6089\u7684\u8bdd\uff0c\u53ef\u4ee5\u53bb\u7f51\u4e0a\u641c\u7d22\u4e0b\u76f8\u5173\u77e5\u8bc6\u3002\u8fd9\u91cc\u76f4\u63a5\u7ed9\u51fa\u76f8\u5e94\u7684\u4f2a\u4ee3\u7801\uff1a<\/p>\n
           <\/p>\n
          \n \n \n 
            \n  \n  \n  
          1. network_init  <\/span><\/span><\/li>\n  \n  \n  
          2. {  <\/span><\/li>\n  \n  \n  
          3. set_ports; \/\/\u8bbe\u7f6e\u7aef\u53e3\u53f7\uff0c#define MYSQL_PORT 3306  <\/span><\/li>\n  \n  \n  
          4. socket\uff1b \/\/\u521b\u5efa\u5957\u63a5\u5b57  <\/span><\/li>\n  \n  \n  
          5. bind; \/\/\u7ed1\u5b9a\u7aef\u53e3\u53f7  <\/span><\/li>\n  \n  \n  
          6. listen\uff1b \/\/\u76d1\u542c\u7aef\u53e3\u53f7  <\/span><\/li>\n  \n  \n  
          7. } <\/span><\/li>\n \n \n <\/ol><\/pre>\n
             <\/p>\n
            3.\u8fde\u63a5\u7684\u65b9\u5f0f<\/strong><\/p>\n
            \u8fdb\u7a0b\u95f4\u901a\u4fe1\u7684\u65b9\u5f0f\u4e0d\u6b62\u662fSOCKET\uff0c\u8fd8\u6709\u5176\u4ed6\u5f88\u591a\u65b9\u5f0f\u3002Mysql\u652f\u6301\u4e09\u79cd\u8fde\u63a5\u65b9\u5f0f\uff1anamepipe\u3001socket\u548cshared memory\uff0c\u5373\u547d\u540d\u7ba1\u9053\u3001\u5957\u63a5\u5b57\u548c\u5171\u4eab\u5185\u5b58\u7684\u65b9\u5f0f\u3002\u8fd9\u4e09\u79cd\u65b9\u5f0f\u662f\u53ef\u4ee5\u5171\u5b58\u7684\u3002\u9ed8\u8ba4\u53ea\u4f7f\u7528\u5957\u63a5\u5b57\u3002<\/p>\n
            TCP\/IP\u5957\u63a5\u5b57\u65b9\u5f0f\u662fMySQL\u5728\u4efb\u4f55\u5e73\u53f0\u4e0b\u90fd\u63d0\u4f9b\u7684\u8fde\u63a5\u65b9\u5f0f\uff0c\u4e5f\u662f\u7f51\u7edc\u4e2d\u4f7f\u7528\u5f97\u6700\u591a\u7684\u4e00\u79cd\u65b9\u5f0f\u3002\u8fd9\u79cd\u65b9\u5f0f\u5728TCP\/IP\u8fde\u63a5\u4e0a\u5efa\u7acb\u4e00\u4e2a\u57fa\u4e8e\u7f51\u7edc\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u5ba2\u6237\u7aef\u5728\u4e00\u53f0\u670d\u52a1\u5668\u4e0a\uff0c\u800cMySQL\u5b9e\u4f8b\u5728\u53e6\u4e00\u53f0\u670d\u52a1\u5668\u4e0a\uff0c\u8fd9\u4e24\u53f0\u673a\u5668\u901a\u8fc7\u4e00\u4e2aTCP\/IP\u7f51\u7edc\u8fde\u63a5\u3002<\/p>\n
            \u4f8b\u5982\uff0c\u6211\u53ef\u4ee5\u5728Windows\u670d\u52a1\u5668\u4e0b\u8bf7\u6c42\u4e00\u53f0\u8fdc\u7a0bLinux\u670d\u52a1\u5668\u4e0b\u7684MySQL\u5b9e\u4f8b\u3002\u5728Windows 2000\u3001Windows XP\u3001Windows 2003\u548cWindows Vista\u4ee5\u53ca\u5728\u6b64\u4e4b\u540e\u7684 Windows\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0c\u5982\u679c\u4e24\u4e2a\u9700\u8981\u901a\u4fe1\u7684\u8fdb\u7a0b\u5728\u540c\u4e00\u53f0\u670d\u52a1\u5668\u4e0a\uff0c\u90a3\u4e48\u53ef\u4ee5\u4f7f\u7528\u547d\u540d\u7ba1\u9053\uff0cSQL Server\u6570\u636e\u5e93\u9ed8\u8ba4\u5b89\u88c5\u540e\u7684\u672c\u5730\u8fde\u63a5\u4e5f\u4f7f\u7528\u547d\u540d\u7ba1\u9053\u3002\u5728MySQL\u6570\u636e\u5e93\u4e2d\uff0c\u9700\u5728\u914d\u7f6e\u6587\u4ef6\u4e2d\u542f\u7528--enable-named-pipe\u9009\u9879\u3002<\/p>\n
            \u5728MySQL 4.1\u4e4b\u540e\u7684\u7248\u672c\u4e2d\uff0cMySQL\u8fd8\u63d0\u4f9b\u4e86\u5171\u4eab\u5185\u5b58\u7684\u8fde\u63a5\u65b9\u5f0f\uff0c\u5728\u914d\u7f6e\u6587\u4ef6\u4e2d\u6dfb\u52a0--shared-memory\u3002\u5982\u679c\u60f3\u4f7f\u7528\u5171\u4eab\u5185\u5b58\u7684\u65b9\u5f0f\uff0c\u5728\u8fde\u63a5\u65f6\uff0cMysql\u5ba2\u6237\u7aef\u8fd8\u5fc5\u987b\u4f7f\u7528-protocol=memory\u9009\u9879\u3002\u542f\u52a8\u65f6\u53ef\u4ee5\u901a\u8fc7\u4e0b\u9762\u7684\u53c2\u6570\u8fdb\u884c\u8bbe\u7f6e\u3002<\/p>\n
             <\/p>\n
            \n \n \n 
              \n  \n  \n  
            1. mysqld.exe --enable-named-pipe  <\/span><\/span><\/li>\n  \n  \n  
            2. mysqld.exe --shared-memory <\/span><\/li>\n \n \n <\/ol><\/pre>\n
               <\/p>\n
              \u9664\u4e86\u5728\u542f\u52a8\u65f6\u8fdb\u884c\u53c2\u6570\u8bbe\u7f6e\u5916\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539MY.INI\u6587\u4ef6\u8fdb\u884c\u8bbe\u7f6e\u3002\u6211\u4eec\u6765\u770b\u4e0b\u6e90\u7801\u4e2d\u9009\u62e9\u8fde\u63a5\u65b9\u5f0f\u7684\u5206\u652f\u51fd\u6570handle_connections_methods\uff1a<\/p>\n
               <\/p>\n
              \n \n \n 
                \n  \n  \n  
              1. handle_connections_methods()  <\/span><\/span><\/li>\n  \n  \n  
              2. {  <\/span><\/li>\n  \n  \n  
              3. if (hPipe != INVALID_HANDLE_VALUE)  <\/span><\/li>\n  \n  \n  
              4. {  <\/span><\/li>\n  \n  \n  
              5. handler_count++;  <\/span><\/li>\n  \n  \n  
              6. if (pthread_create(&hThread,&connection_attrib,  <\/span><\/li>\n  \n  \n  
              7. handle_connections_namedpipes, 0))  <\/span><\/li>\n  \n  \n  
              8. {  <\/span><\/li>\n  \n  \n  
              9. sql_print_warning(\"Can't create thread to handle named pipes\");  <\/span><\/li>\n  \n  \n  
              10. handler_count--;  <\/span><\/li>\n  \n  \n  
              11. }  <\/span><\/li>\n  \n  \n  
              12. }  <\/span><\/li>\n  \n  \n  
              13. if (have_tcpip && !opt_disable_networking)  <\/span><\/li>\n  \n  \n  
              14. {  <\/span><\/li>\n  \n  \n  
              15. handler_count++;  <\/span><\/li>\n  \n  \n  
              16. if (pthread_create(&hThread,&connection_attrib,  <\/span><\/li>\n  \n  \n  
              17. handle_connections_sockets, 0))  <\/span><\/li>\n  \n  \n  
              18. {  <\/span><\/li>\n  \n  \n  
              19. sql_print_warning(\"Can't create thread to handle TCP\/IP\");  <\/span><\/li>\n  \n  \n  
              20. handler_count--;  <\/span><\/li>\n  \n  \n  
              21. }  <\/span><\/li>\n  \n  \n  
              22. }  <\/span><\/li>\n  \n  \n  
              23.  <\/span><\/li>\n  \n  \n  
              24. if (opt_enable_shared_memory)  <\/span><\/li>\n  \n  \n  
              25. {  <\/span><\/li>\n  \n  \n  
              26. handler_count++;  <\/span><\/li>\n  \n  \n  
              27. if (pthread_create(&hThread,&connection_attrib,  <\/span><\/li>\n  \n  \n  
              28. handle_connections_shared_memory, 0))  <\/span><\/li>\n  \n  \n  
              29. {  <\/span><\/li>\n  \n  \n  
              30. sql_print_warning(\"Can't create thread to handle shared memory\");  <\/span><\/li>\n  \n  \n  
              31. handler_count--;  <\/span><\/li>\n  \n  \n  
              32. }  <\/span><\/li>\n  \n  \n  
              33. }  <\/span><\/li>\n  \n  \n  
              34. } <\/span><\/li>\n \n \n <\/ol><\/pre>\n
                 <\/p>\n
                \u7531\u4e8e\u5bf9\u4e8enamepipe\u548cmemory share\u7684\u901a\u4fe1\u65b9\u5f0f\u4e0d\u592a\u4e86\u89e3\uff0c\u8fd9\u91cc\u53ea\u7814\u7a76socket\u7684\u901a\u4fe1\u65b9\u5f0f\u3002\u4ece\u4ee3\u7801\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0chandle_connections_sockets\u4fbf\u662fsocket\u7684\u8bbe\u7f6e\uff0c\u6211\u4eec\u5c31\u6765\u770b\u4e0b\u5b83\u3002<\/p>\n
                4.socket\u7ba1\u7406\u521b\u5efa\u65b0\u7ebf\u7a0b <\/strong><\/p>\n
                socket\u7ba1\u7406\u5176\u5b9e\u6bd4\u8f83\u7b80\u5355\uff0c\u76f4\u63a5\u7ed9\u51fa\u5176\u4f2a\u4ee3\u7801\uff1a<\/p>\n
                 <\/p>\n
                \n \n \n 
                  \n  \n  \n  
                1. handle_connections_sockets  <\/span><\/span><\/li>\n  \n  \n  
                2. {  <\/span><\/li>\n  \n  \n  
                3. select; \/\/\u76d1\u89c6socket\u6587\u4ef6\u63cf\u8ff0\u7b26  <\/span><\/li>\n  \n  \n  
                4. new_socket<\/span> = <\/span>accept<\/span>;\/\/\u5904\u7406\u5230\u6765\u7684\u5ba2\u6237\u7aef\u8fde\u63a5  <\/span><\/li>\n  \n  \n  
                5. thd<\/span> = <\/span>new<\/span> THD\uff1b\u521b\u5efaTHD\u7c7b  <\/span><\/li>\n  \n  \n  
                6. vio_tmp<\/span> = <\/span>vio_new<\/span>(new_socket,VIO_TYPE_TCPIP, 0); \/\/\u521d\u59cb\u5316VIO\u7ed3\u6784\u4f53  <\/span><\/li>\n  \n  \n  
                7. my_net_init(&thd-<\/span>><\/span>net, vio_tmp);\/\/\u521d\u59cb\u5316thd\u7684net\u7ed3\u6784\u4f53  <\/span><\/li>\n  \n  \n  
                8. create_new_thread(thd);\/\/\u4e3a\u8fd9\u4e2a\u8fde\u63a5\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u7ebf\u7a0b\uff0c\u5982\u679c\u662f\u5355\u7ebf\u7a0b\u6a21\u5f0f\u7684\u8bdd\uff0c\u5c31\u4e0d\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7ebf\u7a0b  <\/span><\/li>\n  \n  \n  
                9. } <\/span><\/li>\n \n \n <\/ol><\/pre>\n
                   <\/p>\n
                  \u9996\u5148\u662fselect\u51fd\u6570\u8fdb\u884c\u76d1\u89c6socket\u7aef\u53e3\uff0c\u5982\u679c\u76d1\u63a7\u5230\u6709\u8fde\u63a5\uff0c\u5219\u901a\u8fc7accept\u51fd\u6570\u63a5\u53d7\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\uff0c\u7136\u540e\u65b0\u5efa\u4e00\u4e2aTHD\u7c7b\uff0c\u5c06\u8fde\u63a5\u53c2\u6570\u5168\u90e8\u8bbe\u7f6e\u5230THD\u7c7b\u7684\u53c2\u6570\u4e0a\uff0c\u6700\u540e\u8c03\u7528create_new_thread\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u4fbf\u662f\u91cd\u70b9\u3002 \u6211\u4eec\u8fdb\u5165\u8fd9\u4e2a\u51fd\u6570\uff0c\u770b\u4e0b\u505a\u4e86\u5565\u3002<\/p>\n
                   <\/p>\n
                  \n \n \n 
                    \n  \n  \n  
                  1. create_new_thread  <\/span><\/span><\/li>\n  \n  \n  
                  2. {  <\/span><\/li>\n  \n  \n  
                  3. ++connection_count;\/\/\u5168\u5c40\u8fde\u63a5\u6570\u81ea\u589e  <\/span><\/li>\n  \n  \n  
                  4. thread_count++; \/\/\u5168\u5c40\u7ebf\u7a0b\u6570\u81ea\u589e  <\/span><\/li>\n  \n  \n  
                  5. thread_scheduler.add_connection(thd);\/\/\u771f\u6b63\u521b\u5efa\u7ebf\u7a0b  <\/span><\/li>\n  \n  \n  
                  6. } <\/span><\/li>\n \n \n <\/ol><\/pre>\n
                     <\/p>\n
                    So easy,\u9996\u5148\u5c06\u5168\u5c40\u8fde\u63a5\u6570+1\uff0c\u5168\u5c40\u7ebf\u7a0b\u6570+1\uff0c\u7136\u540e\u8c03\u7528add_connection\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u5c31\u662f\u6211\u4eec\u5728\u4e0a\u9762\u7b2c\u4e00\u6b65\u8bbe\u7f6e\u8fde\u63a5\u7684<\/p>\n
                    \u7ebf\u7a0b\u6570\u4e2d\uff0cone_thread_scheduler\u548cone_thread_per_connection_scheduler\u4e2d\u8bbe\u7f6e\u7684\u4e00\u4e2a\u53c2\u6570\u3002\u8fd9\u4e24\u8005\u7684\u533a\u522b\u4fbf\u662f\u662f\u5426\u521b\u5efa\u4e86<\/p>\n
                    \u4e00\u4e2a\u65b0\u7684\u7ebf\u7a0b\u6765\u5904\u7406\u5230\u6765\u7684\u8fde\u63a5\u3002one_thread_scheduler\u662f\u5355\u7ebf\u7a0b\u65b9\u5f0f\uff0c\u6728\u6709\u65b0\u5efa\u7ebf\u7a0b\u3002\u6211\u4eec\u91cd\u70b9\u7814\u7a76one_thread_per_connection_scheduler\uff0c\u5176\u8bbe\u7f6e\u7684add_connection\u51fd\u6570\u4e3acreate_thread_to_handle_connection\uff1a<\/p>\n
                     <\/p>\n
                    \n \n \n 
                      \n  \n  \n  
                    1. create_thread_to_handle_connection(THD *thd)  <\/span><\/span><\/li>\n  \n  \n  
                    2. {  <\/span><\/li>\n  \n  \n  
                    3. thread_created++;  <\/span><\/li>\n  \n  \n  
                    4. threads.append(thd); \/\/ \u521b\u5efa\u7ebf\u7a0b\u6570\u81ea\u589e\uff0c\u5e76\u52a0\u5165\u5230threads\u94fe\u8868\u4e0a  <\/span><\/li>\n  \n  \n  
                    5. pthread_create(&thd-<\/span>><\/span>real_id,&connection_attrib,  <\/span><\/li>\n  \n  \n  
                    6. handle_one_connection,  <\/span><\/li>\n  \n  \n  
                    7. (void*) thd);\/\/\u8fd9\u5c31\u662f\u771f\u6b63\u521b\u5efa\u7ebf\u7a0b\u7684\u5730\u65b9\u4e86\uff0c\u51fd\u6570\u4fbf\u662fhandle_one_connection  <\/span><\/li>\n  \n  \n  
                    8. } <\/span><\/li>\n \n \n <\/ol><\/pre>\n
                       <\/p>\n
                      \u53ef\u89c1\uff0c\u6700\u540e\u8c03\u7528\u4e86pthread_create\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u4fbf\u662f\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u7ebf\u7a0b\uff0c\u65b0\u7ebf\u7a0b\u7684\u5904\u7406\u51fd\u6570\u4e3ahandle_one_connection.<\/p>\n
                      5.\u65b0\u7ebf\u7a0b\u5904\u7406\u6d41\u7a0b<\/strong><\/p>\n
                      \u65b0\u7ebf\u7a0b\u5904\u7406\u51fd\u6570\u4e3ahandle_one_connection\uff0c\u5230\u6b64\u4f4d\u7f6e\uff0c\u4e00\u4e2a\u65b0\u7684connection\u88ab\u4e00\u4e2a\u65b0\u521b\u5efa\u7684\u7ebf\u7a0b\u6240\u5355\u72ec\u5904\u7406\u3002\u6211\u4eec\u770b\u4e0b\u5176\u4e2d<\/p>\n
                      \u662f\u5982\u4f55\u8fdb\u884c\u5904\u7406\u7684\u3002<\/p>\n
                       <\/p>\n
                      \n \n \n 
                        \n  \n  \n  
                      1. handle_one_connection(void *arg)  <\/span><\/span><\/li>\n  \n  \n  
                      2. {  <\/span><\/li>\n  \n  \n  
                      3. for (;;)  <\/span><\/li>\n  \n  \n  
                      4. {  <\/span><\/li>\n  \n  \n  
                      5. lex_start(thd); \/\/\u521d\u59cb\u5316\u8bcd\u6cd5\u5206\u6790\u7ed3\u6784\u4f53  <\/span><\/li>\n  \n  \n  
                      6. login_connection(thd); \/\/\u7528\u6237\u8ba4\u8bc1\uff0c\u5931\u8d25\u62a5\u9519  <\/span><\/li>\n  \n  \n  
                      7. prepare_new_connection_state(THD* thd)\uff1b\/\/Initialize THD to handle queries  <\/span><\/li>\n  \n  \n  
                      8. while (!net-<\/span>><\/span>error && net-<\/span>><\/span>vio != 0 && \/\/\u5faa\u73af\u5904\u7406command  <\/span><\/li>\n  \n  \n  
                      9. !(thd-<\/span>><\/span>killed<\/span> == THD::KILL_CONNECTION))  <\/span><\/li>\n  \n  \n  
                      10. {  <\/span><\/li>\n  \n  \n  
                      11. if (do_command(thd))  <\/span><\/li>\n  \n  \n  
                      12. break; \/\/\u5904\u7406\u5931\u8d25\u8df3\u51fa  <\/span><\/li>\n  \n  \n  
                      13. }  <\/span><\/li>\n  \n  \n  
                      14. end_connection(thd); \/\/\u5173\u95ed\u8fde\u63a5  <\/span><\/li>\n  \n  \n  
                      15. close_connection(thd, 0, 1);  <\/span><\/li>\n  \n  \n  
                      16. thread_scheduler.end_thread(thd,1);\/\/\u7ed3\u675f\u7ebf\u7a0b  <\/span><\/li>\n  \n  \n  
                      17. return 0;  <\/span><\/li>\n  \n  \n  
                      18. }  <\/span><\/li>\n  \n  \n  
                      19. } <\/span><\/li>\n \n \n <\/ol><\/pre>\n
                         <\/p>\n
                        \u9996\u5148\u8fdb\u884c\u4e86\u8bcd\u6cd5\u5206\u6790\u7ed3\u6784\u4f53\u7684\u521d\u59cb\u5316\uff0c\u7136\u540e\u8fdb\u884c\u7528\u6237\u8ba4\u8bc1\uff0c\u8ba4\u8bc1\u6210\u529f\u540e\u901a\u8fc7do_command\u5faa\u73af\u6267\u884c\u5ba2\u6237\u7aef\u53d1\u8fc7\u6765\u7684\u547d\u4ee4\u3002<\/p>\n
                        6.\u603b\u7ed3<\/strong><\/p>\n
                        \u6574\u4e2aconnection manager\u7684\u6d41\u7a0b\u5341\u5206\u6e05\u6670\uff0c\u5355\u7ebf\u7a0b\u7684\u8fde\u63a5\u4e00\u822c\u5f88\u5c11\u4f7f\u7528\uff0c\u5927\u591a\u4f7f\u7528\u591a\u7ebf\u7a0b\u65b9\u5f0f\u3002\u591a\u7ebf\u7a0b\u8fde\u63a5\u4e2d\u5176\u5b9e\u8fd8\u6d89\u53ca\u5230\u7ebf\u7a0b\u7f13\u51b2\u6c60\u7684\u6982\u5ff5\uff0c\u5373\u5982\u679c\u4e00\u4e2a\u8fde\u63a5\u65ad\u5f00\u540e\uff0c\u5176\u6240\u521b\u5efa\u7684\u7ebf\u7a0b\u4e0d\u4f1a\u88ab\u9500\u6bc1\u6389\uff0c\u800c\u662f\u653e\u5230\u7f13\u51b2\u6c60\u4e2d\uff0c\u7b49\u5f85\u4e0b\u4e00\u4e2a\u65b0\u7684connection\u5230\u6765\u65f6\uff0c\u9996\u5148\u53bb\u7ebf\u7a0b\u7f13\u51b2\u6c60\u67e5\u627e\u662f\u5426\u6709\u7a7a\u95f2\u7684\u7ebf\u7a0b\uff0c\u6709\u7684\u8bdd\u76f4\u63a5\u4f7f\u7528\uff0c\u6728\u6709\u7684\u8bdd\u624d\u53bb\u521b\u5efa\u65b0\u7684\u7ebf\u7a0b\u6765\u7ba1\u7406\u8fd9\u4e2aconnection\u3002<\/p>\n
                        \u5173\u4e8eMySQL\u6570\u636e\u5e93Connection Manager\u7684\u76f8\u5173\u77e5\u8bc6\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u5e0c\u671b\u672c\u6b21\u7684\u4ecb\u7ecd\u80fd\u591f\u5bf9\u60a8\u6709\u6240\u6536\u83b7\uff01<\/p>\n
                        \u3010\u7f16\u8f91\u63a8\u8350\u3011<\/p>\n
                          \n
                        1. MySQL\u6570\u636e\u5e93my.cnf\u914d\u7f6e\u6587\u4ef6\u6ce8\u91ca\u8be6\u89e3<\/font><\/li>\n
                        2. SQL Server\u6570\u636e\u5e93\u590d\u5236\u5931\u8d25\u7684\u539f\u56e0\u53ca\u89e3\u51b3\u65b9\u6848<\/font><\/li>\n
                        3. SQL Server 2005\u6570\u636e\u5e93\u6e38\u6807\u8c03\u7528\u51fd\u6570\u5b9e\u4f8b\u89e3\u6790<\/font><\/li>\n
                        4. MySQL\u6570\u636e\u5e93\u4e2dEXPLAIN\u7684\u4f7f\u7528\u53ca\u5176\u6ce8\u610f\u4e8b\u9879\u8be6\u89e3<\/font><\/li>\n
                        5. SQL Server\u6570\u636e\u5e93\u7528\u89c6\u56fe\u6765\u5904\u7406\u590d\u6742\u7684\u6570\u636e\u67e5\u8be2\u5173\u7cfb<\/font><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
                          MySQL\u6570\u636e\u5e93Connection Manager\u7684\u76f8\u5173\u77e5\u8bc6\u662f\u672c\u6587\u6211\u4eec\u4e3b\u8981\u8981\u4ecb\u7ecd\u5230\u5185\u5bb9\uff0c\u63a5\u4e0b\u6765\u5c31\u8ba9\u6211\u4eec\u4e00\u8d77\u6765 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7038],"tags":[],"class_list":["post-311439","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/311439","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=311439"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/311439\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=311439"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=311439"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=311439"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}