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Oracle中如何直接运行OS命令(下)

2024-08-29 13:43:35
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  EXEC SQL WHENEVER SQLERROR CONTINUE;
  sqlglm(msg_buffer, &buffer_size, &msg_length);
  PRintf("Daemon error while connecting:/n");
  printf("%.*s/n", msg_length, msg_buffer);
  printf("Daemon quitting./n");
  exit(1);
  }    void 
  sql_error() 
  { 
  char msg_buffer[512];
  int msg_length;
  int buffer_size = 512;  EXEC SQL WHENEVER SQLERROR CONTINUE;
  sqlglm(msg_buffer, &buffer_size, &msg_length);
  printf("Daemon error while executing:/n");
  printf("%.*s/n", msg_length, msg_buffer);
  printf("Daemon continuing./n");
  } 
  main() 
  { 
  EXEC SQL WHENEVER SQLERROR DO connect_error();
  EXEC SQL CONNECT :uid;
  printf("Daemon connected./n");  EXEC SQL WHENEVER SQLERROR DO sql_error();
  printf("Daemon waiting.../n");
  while (1) { 
  EXEC SQL EXECUTE 
  BEGIN 
  /*接收deamon发来的字符*/ 
  :status := DBMS_PipE.RECEIVE_MESSAGE('daemon');
  IF :status = 0 THEN 
  /*取出字符*/ 
  DBMS_PIPE.UNPACK_MESSAGE(:command);
  END IF;
  END;
  END-EXEC;
  IF (status == 0) 
  { 
  command.arr[command.len] = '/0';
  /*假如是stop,该进程就退出*/ 
  IF (!strcmp((char *) command.arr, "STOP")) 
  { 
  printf("Daemon exiting./n");
  break;
  }   ELSE IF (!strcmp((char *) command.arr, "SYSTEM")) 
  { 
  EXEC SQL EXECUTE 
  BEGIN 
  DBMS_PIPE.UNPACK_MESSAGE(:return_name);
  DBMS_PIPE.UNPACK_MESSAGE(:value);
  END;
  END-EXEC;
  value.arr[value.len] = '/0';
  printf("Will execute system command '%s'/n", value.arr);
  /*运行os命令*/ 
  status = system(value.arr);
  EXEC SQL EXECUTE 
  BEGIN 
  DBMS_PIPE.PACK_MESSAGE('done');
  DBMS_PIPE.PACK_MESSAGE(:status);
  :status := DBMS_PIPE.SEND_MESSAGE(:return_name);
  END;
  END-EXEC;    IF (status) 
  { 
  printf 
  ("Daemon error while responding to system command.");
  printf(" status: %d/n", status);
  } 
  } 
  ELSE 
  { 
  printf 
  ("Daemon error: invalid command '%s' received./n",  command.arr);
  } 
  } 
  ELSE 
  { 
  printf("Daemon error while waiting for signal.");
  printf(" status = %d/n", status);
  } 
  } 
  EXEC SQL COMMIT WORK RELEASE;
  exit(0);
  }    以上代码起名为daemon.pc,用proc预编译:   proc iname=daemon.pc userid=用户名/密码@服务名 sqlcheck=semantics 
  得到daemon.c,在用c进行编译,注重在NT上要把orasql8.lib加上,否则编译通过,连接没法通过。   3、在服务器上运行daemon.exe   4、在sqlplus运行测试语句:   SQL> variable rv number 
  SQL> execute :rv := DAEMON.EXECUTE_SYSTEM('ls -la');
  PL/SQL 过程已成功完成。 
  SQL> execute :rv := DAEMON.EXECUTE_SYSTEM('dir');
  PL/SQL 过程已成功完成。 
  SQL>   DBMS_PIPE的用法见Oracle的文档。

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