读字段值 (记录集句柄, “在线用户”, 账号ID)
调试输出 (账号ID)
到下一行 (记录集句柄)
计次循环尾 ()
查看mysql版本的四种方法1:在终端下:mysql -V。 以下是代码片段:
[shengting@login ~]$ mysql -V
mysql Ver 14.7 Distrib 4.1.10a, for redhat-linux-gnu (i686)
2:在mysql中:mysql>status
以下是代码片段:
mysql>status
--------------
mysql Ver 14.7 Distrib 4.1.10a, for redhat-linux-gnu (i686)
Connection id: 416
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter:
Server version: 3.23.56-log
Protocol version: 10
Connection: Localhost via UNIX socket
Client characterset: latin1
Server characterset: latin1
UNIX socket: /tmp/mysql_3311.sock
Uptime: 62 days 21 hours 21 min 57 sec
Threads: 1 Questions: 584402560 Slow queries: 424 Opens: 59664208 Flush tables: 1 Open tables: 64 Queries per second avg: 107.551
3:在help里面查找
以下是代码片段:
[shengting@login ~]$ mysql --help | grep Distrib
mysql Ver 14.7 Distrib 4.1.10a, for redhat-linux-gnu (i686)
4:使用mysql的函数
以下是代码片段:
mysql>select version()
+-------------+
| version() |
+-------------+
| 3.23.56-log |
+-------------+
1 row in set (0.00 sec)
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