In this article we learned how to sort strings or arrays of numbers in Perl.
Perl has a built-in function called sort. There is no doubt that you can sort an array. The simplest form is to pass an array that returns an array of sorted elements. @sorted = Sort @original.
Sort based on ASCII code
Copy Code code as follows:
#!/usr/bin/perl
Use strict;
Use warnings;
Use 5.010;
Use Data::D umper qw (dumper);
My @words = QW
In this article we learned how to sort strings or arrays of numbers in Perl.
Perl has a built-in function called sort. There is no doubt that you can sort an array. The simplest form is to pass an array that returns an array of sorted elements. @sorted = Sort @original.
Sort based on ASCII code
Copy Code code as follows:
#!/usr/bin/perl
Use strict;
Use warnings;
Use 5.010;
Use Data::D umper qw (dumper);
My @words = QW
/data/stored mysql data, LS can be viewed to have this directory, you can omit this step.#./scripts/mysql_install_db--user=mysql--datadir=/data/mysqlFATAL Error:please Install the following Perl modules before executing./SCRIPTS/MYSQL_INSTALL_DB:Data::D umper initialization, in effect, is to generate/data/mysql this directory. This is the MySQL database directory, just like the KeePass password database. At this point a module is missing, the module is called Dumper.Solution: When the package or
file, and the main library does not have to wait for all of the library's feedback to the main library. At the same time, this is just a feedback to be received, rather than the feedback that has been fully executed and submitted, thus saving a lot of time.
second, semi-synchronous replication technologyWe are talking about the second structure today. We know that the normal replication, the asynchronous replication of MySQL, relies on the MySQL binary log, also known as binary logs, for d
In this article we learned how to sort strings or arrays of numbers in Perl.
Perl has a built-in function called sort. There is no doubt that you can sort an array. The simplest form is to pass an array that returns an array of sorted elements. @sorted = Sort @original.
Sort based on ASCII code
The code is as follows:
#!/usr/bin/perl
Use strict;
Use warnings;
Use 5.010;
Use Data::D umper qw (dumper);
My @words = QW (foo bar zorg moo);
Say
-compress-raw-zlib.x86_64.1.2.061-4.el7 will be installed--Resolve dependency completionDependency resolution========================================================================================Package schema version Source size========================================================================================Installing:MARIADB x86_64 1:5.5.56-2.EL7 Base 8.7 MMariadb-server x86_64 1:5.5.56-2.EL7 Base One MTo install for dependency:Perl-compress-raw-bzip2 x86_64 2.061-3.el7 Base KPerl-com
ERROR: please install the following Perl modules before executing ./scripts/mysql_install_db:Data::Dumper[[emailprotected] mysql]#
The missing dumper module is now indicated
Find the Dumper module packageYum List |grep perl |grep-i dumperList dumper packets containing Perl modules, case-insensitive;[[ema
, why only one dumper at a time?The process of dump is to rename the log file to PREVIOUS.LOG, then analyze PREVIOUS.LOG's data for persistence, and if there is a second dump, it will replace the first dump PREVIOUS.LOG, affecting the persistence of the first dump. So, smart you think so, why not rename to XXX.LOG, each renaming is different? In fact, if there are two dumper,mnesia that only guarantee that
VarDumper. Symfony VarDumper can not only debug like var_dump (), but also do better, not just face-to-face:
You can easily configure the output data format: HTML or command line style
VarDumper intelligently filters out data that may be too large, and you can see exactly what the structure of your data is, if you have no idea, you can wait and see the following.
Each printed object or variable has a specific style.Install and use
After talking so much about it, we finally want to see what i
can not only do like Var_dump () debugging, and can do better, not only by the face of life:
You can easily configure the format of the output data: HTML or command line style
For some of the data that may be repeated too much, vardumper smart filter folds it up, and you can perfectly see what the structure of your data is, and what you can see below.
Each printed object or variable has a specific style.
Installation and use of
After saying so much, we are finally going to have a glimpse o
Python class instances. You only need to use the yaml label !! Python/object.
This will be useful in the future.
Note that the ability to construct an arbitrary Python object may be dangerous if you receive a yaml document from an untrusted source such as Internet. The functionYaml. safe_loadLimits this ability to simple Python objects like integers or lists.
Note that building Python objects in yaml is dangerous, especially when an unknown yaml document is received. Yaml. safe_load can limit
The most common method for parsing XML in Perl is to use XML: Dom and XML: simple. XML: The Dom is too large and the parsing result is a DOM tree, which is inconvenient to operate. For small and non-complex XML files, XML: Dom is a cool tool. Now it's the turn of the lightweight XML: simple.
XML: simple is as simple as its name. Assume that the XML content is as follows:
Write as follows:
use XML::Simple;use Data::Dumper;$xml = XMLin('sample.xml');pr
I 've been tossing for several hours. Come on, remember it!
JSON: Xs Chinese compatibility problems recently encountered a encoding problem. The first line in the figure is the correct content, and the second and third lines are JSON fragments: because the data source has various directions, some are transcoded and some are not. When JSON: Xs is used to generate JSON, the Generated Chinese content is sometimes garbled. Later I found out the problem: JSON: XS, when encoding UTF-8, the input varia
comments section.If you make a lot of useful comments to some people's bugs, they may trust your judgment and want you to modify them directly, but unless they wishYes, you 'd better be careful and just comment.
Bugzilla is open source software. Its source code complies with Mozilla Public License.
If your machine already has MySQL and MySQL-related Perl packages, the installation is very straightforward. If you have not installed these basicSoftware, the first thing you need to do is install t
user for MySQL in the specified DataDir (database directory, assigned to directory, directory does not exist, the previous level directory exists automatically created) [[emailprotected] mysql]# ./scripts/mysql_install_db --user=mysql --datadir=/data/mysql
FATAL ERROR: please install the following Perl modules before executing ./scripts/mysql_install_db:
Data::Dumper #少了一个模块,dumperWe can use a command blur to find the package we need [[
, to the topic style relies on the more serious procedures, to measure whether to upgrade to QT5.In the. Pro file, the target in QT4 (Qmake v2) is not filled in, then it automatically takes the. Pro file name, while in Qt5 (Qmake v3) This target has to be written.Q_WS_XX macros are not available, use Q_OS_XX instead.As for the C++11 support connection signal and slot can not use slot, signal macro problem, now do not change it, although the new method to remove the two macros, and strengthen the
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