Tcl internal variables eryar@163.com 在Tcl中内置了一些变量,并赋予了一定的功能.内置变量列表如下: 变量名称 功能描述 argc 指命令行参数的个数. argv 指包含命令行参数的列表. argv0 是指被解释的文件或由调用脚本的名称的文件名. env 用于表示是环境变量数组元素. errorCode 为最后的Tcl错误的错误代码. errorInfo 为最后Tcl错误的堆栈跟踪信息. tcl_interactive 分别将其设置为1和0交互和非交互模式之…

控制台输出的时候显示一串这样的信息:[Project Name] was compiled with optimization - stepping may behave oddly; variables may not be available.如图所示:解决方法:1>2>…

30.5 Examples of MIB Variables Versions 1 and 2 of SNMP each collected variables together in a single large MIB, with the entire set documented in a single RFC. After publication of the second generation, MIB-II, the IETF took a different approach by…

错误:foreach statement cannot operate on variables of type 'System.Web.UI.WebControls.Table' because 'System.Web.UI.WebControls.Table' does not contain a public definition for 'GetEnumerator' foreach (TableRow tr in table) {   ... } 修改为 foreach (TableR…

今天安装ecshop的时候最上面出现了一个错误提示:Strict Standards: Only variables should be passed by reference in F:\www.xxxx.com\cls_template.php on line 418 解决办法: 打开cls_template.php文件中发现下面这段代码: $tag_sel = array_shift(explode(' ', $tag));忘记说了,我的PHP版本是5.4.19,PHP5.3以上默认只能传…

Problem 许多时候, 我们想要Table Variables在动态SQL中执行,但现实是很骨感的.比如这个示例: DECLARE @sql_command NVARCHAR(MAX); DECLARE @parameter_list NVARCHAR(MAX); ) ); SELECT @sql_command = ' SELECT DISTINCT FirstName FROM Person.Person WHERE LastName IN (SELECT last_name FROM…

PHP stands for "Hypertext Preprocessor" ,it is a server scripting language. What Can PHP Do? PHP can generate dynamic page content PHP can create, open, read, write, delete, and close files on the server PHP can collect form data PHP can send an…

1.show status    查看系统运行的实时状态,便于dba查看mysql当前运行的状态,做出相应优化,动态的,不可认为修改,只能系统自动update. MariaDB [(none)]> show status like '%conn%'; +--------------------------+----------+ | Variable_name            | Value    | +--------------------------+----------+ | Ab…

一次偶然的机会,show processlist 的时候,发现有个 Client 一直在执行  "mysql-connector-java-5.1.21 ( Revision: ${bzr.revision-id} ) */SHOW VARIABLES WHERE Variable_name" 后面和基友一起讨论,稍微缕了一下.大概思路是这样的的: 1.MySQL JDBC 连接过程大概如下(开启 general log 获得的信息): 5089492 Connect user@ip…

Explanations of Functionalities: 1. PATH env variable It is used to search the command directory when we use the console type commands. We only can use the javac and java command anywhere after the jdk\bin and jdk\jre\bin directory have been added in…