"username","password", {'RaiseError'=>1});my$sth=$dbh->prepare("SELECT * FROM users");$sth->execute();while(my$row=$sth->fetchrow_hashref()) {print"User:$row->{name}, Age:$row->{age}\n";
Don't worry about the display being a little off the mark, we will cover the formatting in the next lesson. For now let's practice retrieving some user input using PERL. Let's take this example one step further and also request the favorite color of our user. agencolor.pl: #! usr/b...
The current record number (usually line numberZ) for the last filehandle you read from. /(/(RS, $INPUT_RECORD_SEPARATOR) The input record separator, newline by default, which is consulted by the readline function, the <FH> operator, and the chomp function. $/=””将使得记录分割符为空...
from sort"; open(INPUT, 'foo') # get sort's results or die "Can't open 'foo' for input: $!"; FILEHANDLE may be an expression whose value can be used as an indirect filehandle, usually the real filehandle name. closedir DIRHANDLE Closes a directory opened by "opendir" and returns...
Use Win32::GetOSName() or Win32::GetOSVersion() (see Win32 and perlport) to distinguish between the variants. ${^OPEN} An internal variable used by PerlIO. A string in two parts, separated by a "\0" byte, the first part describes the input layers, the second part describes the ...
sudo apt-get install perl # Debian/Ubuntu sudo yum install perl # CentOS/RHEL 1. 2. 配置Perl 安装完成后,可以通过CPAN安装和管理Perl模块: cpan 1. 首次运行cpan命令时,系统会提示进行一些基本配置,按照提示完成配置即可。 三、基本语法与数据类型 ...
select USER(); 显示的为当前使用的user及host; use mysql; select distinct(User) from user; 显示该数据库授权登陆的用户名(其实还有HOST的限制) 如果你有admin的权限可以使用 select * from mysql.user \G 查看所有存在的用户 http://www.111cn.net/database/mysql/46969.htm ...
left to right. From each trailhead there may be many paths, some of which get you there, and some which are dead ends. When you walk along a trail and hit a dead end, you have to backtrack along the trail to an earlier point to try another trail. If you hit your destination, you...
open(SESAME, "filename") # 从现存文件中读取 open(SESAME, "filename") # 创建文件并写入 open(SESAME, ">>filename") # 附加在现存文件后面 open(SESAME, "| output-pipe-command") # 设置一个输出过滤器 open(SESAME, "input-pipe-command |") # 设置一个输入过滤器 象你看到的一样,文件句柄...
$input = ; 下面的例子使用命令w的输出来列出当前登录的所有用户名。 1 : #!/usr/local/bin/perl 2 : 3 : open (WOUT, "w|"); 4 : $time = <WOUT>; 5 : $time =~ s/^ *//; 6 : $time =~ s/ .*//; 7 : ; # skip headings line ...