quotes

问题 How do I insert a value in MySQL that consist of single or double quotes. i.e This is Ashok\'s Pen. The single quote will create problems. There might be other escape characters. How do you insert the data properly? 回答1: Put quite simply: SELECT 'This is Ashok''s Pen.'; So inside the string, replace each single quote with two of them. Or: SELECT 'This is Ashok\'s Pen.' Escape it =) 回答2: See my answer to "How to escape characters in MySQL" Whatever library you are using to talk to MySQL will

问题 Is it better to concatenate a variable (say, $name ) into an existing string (say, $string ) like this: $string=\'Hi, my name is \'.$name or to embed the variable in the string like this: $string=\"Hi, my name is $name\"; or is it better to use a function like this: $string=sprintf(\"Hi, my name is %s\",$name); Which is better in terms of processor time/efficiency? 回答1: Everyone who did the test concluded that using single quotes is marginally better performance wise. In the end single quotes

问题 I\'m trying to find all of the quoted text on a single line. Example: \"Some Text\" \"Some more Text\" \"Even more text about \\\"this text\\\"\" I need to get: \"Some Text\" \"Some more Text\" \"Even more text about \\\"this text\\\"\" \\\"[^\\\"\\r]*\\\" gives me everything except for the last one, because of the escaped quotes. I have read about \\\"[^\\\"\\\\]*(?:\\\\.[^\\\"\\\\]*)*\\\" working, but I get an error at run time: parsing \"\"[^\"\\]*(?:\\.[^\"\\]*)*\"\" - Unterminated [] set

问题 As stated in, When did single quotes in HTML become so popular? and Jquery embedded quote in attribute, the Wikipedia entry on HTML says the following: The single-quote character (\'), when used to quote an attribute value, must also be escaped as ' or ' (should NOT be escaped as ' except in XHTML documents) when it appears within the attribute value itself. Why shouldn\'t ' be used? Also, is " safe to be used instead of " ? 回答1: " is on the official list of valid HTML 4 entities,

问题 I recently ran a command in windows cmd with single quotes in it and found that it did not behave as I expected. From trying to google \"windows batch single quote vs double quote\" I\'ve found a few articles where people asked about having windows treat single quotes like double quotes, and about how bash treats single quotes and double quotes differently. However, I couldn\'t easily find an explicit explanation of what single quotes do in windows batch commands. So what do single quotes do

问题 Seems that the recommended way of doing indirect variable setting in bash is to use eval : var=x; val=foo eval $var=$val echo $x # --> foo The problem is the usual one with eval : var=x; val=1$\'\\n\'pwd eval $var=$val # bad output here (and since it is recommended in many places, I wonder just how many scripts are vulnerable because of this...) In any case, the obvious solution of using (escaped) quotes doesn\'t really work: var=x; val=1\\\"$\'\\n\'pwd\\\" eval $var=\\\"$val\\\" # fail with

问题 Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live. I found this at somebody\'s blog, and it introduces as Rick Osborne\'s. But I google this, and other people says: Martin Golding\'s, John Woods\' and Damian Conway\'s... Yes, Damian Conway used this quote in \"Perl Best Practices\" (2005) but Damian doesn\'t mention who wrote it. Does anybody know who the real author of this aphorism is? 回答1: I thought ChrisW's research was right

问题 How would I go about replacing all of the double quotes in my batch file\'s parameters with escaped double quotes? This is my current batch file, which expands all of its command line parameters inside the string: @echo off call bash --verbose -c \"g++-linux-4.1 %*\" It then uses that string to make a call to Cygwin\'s bash, executing a Linux cross-compiler. Unfortunately, I\'m getting parameters like these passed in to my batch file: \"launch-linux-g++.bat\" -ftemplate-depth-128 -O3 -finline

问题 I\'m outputting values from a database (it isn\'t really open to public entry, but it is open to entry by a user at the company -- meaning, I\'m not worried about XSS.) I\'m trying to output a tag like this: <a href=\"\" onclick=\"DoEdit(\'DESCRIPTION\');\">Click Me</a> DESCRIPTION is actually a value from the database that is something like this: Prelim Assess \"Mini\" Report I\'ve tried replacing \" with \\\", but no matter what I try, Firefox keeps chopping off my JavaScript call after the

问题 I am trying to learn the best way to write queries. I also understand the importance of being consistent. Until now, I have randomly used single quotes, double quotes, and backticks without any real thought. Example: $query = \'INSERT INTO table (id, col1, col2) VALUES (NULL, val1, val2)\'; Also, in the above example, consider that table , col1 , val1 , etc. may be variables. What is the standard for this? What do you do? I\'ve been reading answers to similar questions on here for about 20