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, forcing you to abandon part of the functionality while guaranteeing compatibility. Everything is a trade-off, and there is nothing absolutely correct in it. The concept of correctness differs depending on the angle of the problem. And not all of the user's requirements, you can be satisfied. It is possible that you have met some of the user's requirements, but have brought another problem. Software is not omnipotent, it can solve most of the problems, is the basic success. If you want to look

Use a U disk to start installation system is very common, and U disk startup files are generally installed in the U disk hidden partition, can prevent the invasion of viruses. Now let's give you a detailed introduction to this hidden partition of U disk. In fact, U disk's hidden partition is also called UD file system, UD file system is relatively simple. Developers often deal with problems in a way that i

In fact, U disk's hidden partition is also called UD file system, UD file system is relatively simple. Developers often deal with problems in a way that is simple to do and how to do them. Understanding this, many questions are naturally explained. 1. Do you allow file names with spaces? First of all, we did not carefully verify whether the space is allowed, I would like to say, even if the space is not a

cycle with Lua as the main task, in the C/C ++ layer, the main Lua part only controls the behavior of these objects. I personally advocate development around Lua. C/C ++ only writes some performance-related libraries for Lua to call, that is, the framework layer is in Lua. In this way, the C/C ++ layer only provides object creation and destruction functions, and does not use the C pointer for object mutual reference. When an object in Lua is recycled, destroy the corresponding C object. However

hardware compatibility, forcing you to abandon part of the functionality while guaranteeing compatibility. Everything is a trade-off, and there is nothing absolutely correct in it. The concept of correctness differs depending on the angle of the problem. And not all of the user's requirements, you can be satisfied. It is possible that you have met some of the user's requirements, but have brought another problem. Software is not omnipotent, it can solve most of the problems, is the basic succes

| 6000 Develop | Ten | 5200 Personnel | 5 | 3500 Personnel | 2 | 3900 Sales | 3 | 4800 Sales | 1 | Sales | 4 | 4800 (rows)We now want to compare the salary of each employee to the average salary of his department, how should SQL statements be written? Using window functions, the query can be easily implemented:postgres=# SELECT Depname, empno, salary, AVG (salary) over (PARTITION by depname) from Emp

level, the error granularity in the data page is smaller, and basically does not reflect the database level, that is, in the case of data page level error, This data can be normally accessed, but only when accessing the wrong data page will be error, when we encounter such a mistake, how to solve it?Below we analyze in turn, first we make a classic 824 error , the following part of the content of the database part of the basis, confined to space, we do not do a detailed description:Use cnblogst

Now use a U disk to start installation system is very common, and U disk startup files are generally installed in the U disk hidden partition, can prevent the invasion of viruses. Now let's give you a detailed introduction to this hidden partition of U disk. In fact, U disk's hidden partition is also called UD file system, UD file system is relatively simple. Developers often deal with problems in a way th

Now use a USB flash drive to start the installation system is very common, and the boot file of the U disk is generally installed in the hidden partition of the U disk, you can prevent the virus intrusion. Let's take a look at this hidden partition of the U disk in detail now. In fact, the hidden partition of the U disk is also called UD file system, UD file system is relatively simple. Developers often de

In fact, the hidden partition of the U disk is also called UD file system, UD file system is relatively simple. Developers often deal with problems in ways that are simple to program. To understand this, many questions are naturally explained. 1. Do you want to allow file names with spaces? First declare that we have not carefully examined whether or not to allow the space, I would like to say, even if th

', ' m ', ' n ', ' O ', ' P ', ' Q ', ' R ', ' s ', ' t ', ' u ', ' V ', ' w ', ' X ', ' Y ', ' z ', '-', ', ': ', '.', ',', '/', '%', '#', '! ', ' @ ', ' ', ' (', ') ', ' '[', ']', '{', '}', '\\', '|', '+', '=', '_', '^', '$', '~', '`' ); Return Str_replace ($DBC, $SBC, $STR); Full angle to half angle } Convert character to ASCII code function Asc_encode ($c) { $len = strlen ($c); $a = 0; while ($a { $ud = 0; if (Ord ($c {$a}) >=0 ord ($c {$a})

This article is a PHP ASCII code conversion class for a detailed analysis of the introduction, the need for friends to refer to the copy code code as follows: class ASCII { function decode ($STR) { Preg_match_all ("/(d{2,5})/", $str, $a); $a = $a [0]; foreach ($a as $dec) { if ($dec { $utf. = Chr ($DEC); } else if ($dec { $utf. = Chr (($dec-($dec% 64))/64); $utf. = chr (128 + ($dec% 64)); } Else { $utf. = Chr (224 + ($dec-($dec% 4096))/4096); $utf. = chr (128 + (($d

Copy Code code as follows: Class ASCII { function decode ($STR) { Preg_match_all ("/(d{2,5})/", $str, $a); $a = $a [0]; foreach ($a as $dec) { if ($dec { $utf. = Chr ($DEC); } else if ($dec { $utf. = Chr (($dec-($dec% 64))/64); $utf. = chr (128 + ($dec% 64)); } Else { $utf. = Chr (224 + ($dec-($dec% 4096))/4096); $utf. = chr (128 + (($dec% 4096)-($dec% 64))/64); $utf. = chr (128 + ($dec% 64)); } } return $UTF; } function encode ($c) { $len = strlen ($c); $a = 0;

Copy codeThe Code is as follows: class ascii { Function decode ($ str) { Preg_match_all ("/(d {2, 5})/", $ str, $ ); $ A = $ a [0]; Foreach ($ a as $ dec) { If ($ dec { $ Utf. = chr ($ dec ); } Else if ($ dec { $ Utf. = chr (192 + ($ dec-($ dec % 64)/64 )); $ Utf. = chr (128 + ($ dec % 64 )); } Else { $ Utf. = chr (224 + ($ dec-($ dec % 4096)/4096 )); $ Utf. = chr (128 + ($ dec % 4096)-($ dec % 64)/64 )); $ Utf. = chr (128 + ($ dec % 64 )); } } Return $ utf; } Function encode ($ c) { $ Len = str

This article provides a detailed analysis of the php ascii code conversion class. For more information, see The code is as follows: Class ascii{Function decode ($ str){Preg_match_all ("/(d {2, 5})/", $ str, $ );$ A = $ a [0];Foreach ($ a as $ dec){If ($ dec {$ Utf. = chr ($ dec );}Else if ($ dec {$ Utf. = chr (192 + ($ dec-($ dec % 64)/64 ));$ Utf. = chr (128 + ($ dec % 64 ));}Else{$ Utf. = chr (224 + ($ dec-($ dec % 4096)/4096 ));$ Utf. = chr (128 + ($ dec % 4096)-($ dec % 64)/64 ));$ Utf. =

Copy CodeThe code is as follows: Class ASCII { function decode ($STR) { Preg_match_all ("/(d{2,5})/", $str, $a); $a = $a [0]; foreach ($a as $dec) { if ($dec { $utf. = Chr ($DEC); } else if ($dec { $utf. = Chr (192 + (($dec-($dec% 64))/64); $utf. = Chr (+ ($dec% 64)); } Else { $utf. = Chr (224 + (($dec-($dec% 4096))/4096); $utf. = Chr ((($dec% 4096)-($dec% 64))/64); $utf. = Chr (+ ($dec% 64)); } } return $UTF; } function encode ($c) { $len = strlen ($c); $a = 0; while ($a { $

PHP ASCII code conversion operation class PHP ASCII Conversion class can convert Chinese to ASCII code. And it can be converted in batches, and a commonly used ASCII code restore character is added. The specific code is as follows: Class ASCII{ function decode ($STR){Preg_match_all ("/(d{2,5})/", $str, $a);$a = $a [0];foreach ($a as $dec){if ($dec {$utf. = Chr ($DEC);}else if ($dec {$utf. = Chr (192 + (($dec-($dec% 64))/64);$utf. = Chr (+ ($dec% 64));}Else{$utf. = Chr (224 + (($dec-($dec% 40

This article provides a detailed analysis of the php ascii code conversion class. For more information, see The code is as follows: Class ascii { Function decode ($ str) { Preg_match_all ("/(d {2, 5})/", $ str, $ ); $ A = $ a [0]; Foreach ($ a as $ dec) { If ($ dec { $ Utf. = chr ($ dec ); } Else if ($ dec { $ Utf. = chr (192 + ($ dec-($ dec % 64)/64 )); $ Utf. = chr (128 + ($ dec % 64 )); } Else { $ Utf. = chr (224 + ($ dec-($ dec % 4096)/4096 )); $ Utf. = chr (128 + ($ dec % 4096)-($ dec % 64

;}Function encode ($ c){$ Len = strlen ($ c );$ A = 0;While ($ a {$ Ud = 0;If (ord ($ c {$ a}) >=0 ord ($ c {$ a}) {$ Ud = ord ($ c {$ });$ A + = 1;}Else if (ord ($ c {$ a}) >=192 ord ($ c {$ a}) {$ Ud = (ord ($ c {$ a})-192) * 64 + (ord ($ c {$ a + 1})-128 );$ A + = 2;}Else if (ord ($ c {$ a}) >=224 ord ($ c {$ a}) {$ Ud