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  • Method to concatenate 2 Strings in Java

    - by GooF
    I have a method in Java that concatenates 2 Strings. It currently works correctly, but I think it can be written better. public static String concat(String str1, String str2) { String rVal = null; if (str1 != null || str2 != null) { rVal = ""; if (str1 != null) { rVal += str1; } if (str2 != null) { rVal += str2; } } return rVal; } Here are some of the requirements: If both str1 and str2 are null, the method returns null If either str1 or str2 is null, it will just return the not null String If str1 and str2 are not null, it will concatenate them It never adds "null" to the result Can anyone do this with less code?

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  • Falsey values vs null, undefned, or empty string

    - by user687554
    I've worked with jQuery over the years. However, recently, I've found myself getting deeper into the JavaScript language. Recently, I've heard about "truthy" and falsey values. However, I don't fully understand them. Currently, I have some code that looks like this: var fields = options.fields || ['id', 'query']; I need to identify if fields is null, undefined, or has a length of 0. I know the long way is to do: if ((fields === null) || (fields === undefined) || (fields.length === 0)) { ... } My question is, is the following the same: if (!fields) { ... } Thank you!

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  • how to split data using mysql [closed]

    - by user75238
    I want to display images on left side and right side on my website. For example in this code I have 8 images and I want to split them 4 on the left side and 4 on the right side. In between them I want to put text. How can I do this? $display_image2=mysql_query("select id_topic,topic_title,image2 from topics where image2 not like '' order by id_topic desc limit 8")or die (mysql_error()); This is an image clarify what I want to do: http://oi50.tinypic.com/wsok1t.jpg

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  • Parsing through Arabic / RTL text from left to right

    - by Dan W
    Let's say I have a string in an RTL language such as Arabic with some English chucked in: string s = "Test:?????;?????;?????;a;b" Notice there are semicolons in the string. When I use the Split command like string[] spl = s.Split(';');, then some of the strings are saved in reverse order. This is what happens: ??Test:????? ????? ????? a b The above is out of order compared to the original. Instead, I expect to get this: ?Test: ????? ????? ????? a b I'm prepared to write my own split function. However, the chars in the string also parse in reverse order, so I'm back to square one. I just want to go through each character as it's shown on the screen.

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  • MySQL: Functional Partitioning

    This article contains common different methods of functional partitioning and common considerations for database setup and capacity. Company DBAs, database developers, engineers and architects should consider the pros and cons of any method of sharding or partitioning since compromises will have to be made given the pros and cons of a system setup.

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  • MySQL: Functional Partitioning

    This article contains common different methods of functional partitioning and common considerations for database setup and capacity. Company DBAs, database developers, engineers and architects should consider the pros and cons of any method of sharding or partitioning since compromises will have to be made given the pros and cons of a system setup.

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  • interface abstract in php real world scenario

    - by jason
    The goal is to learn whether to use abstract or interface or both... I'm designing a program which allows a user to de-duplicate all images but in the process rather then I just build classes I'd like to build a set of libraries that will allow me to re-use the code for other possible future purposes. In doing so I would like to learn interface vs abstract and was hoping someone could give me input into using either. Here is what the current program will do: recursive scan directory for all files determine file type is image type compare md5 checksum against all other files found and only keep the ones which are not duplicates Store total duplicates found at the end and display size taken up Copy files that are not duplicates into folder by date example Year, Month folder with filename is file creation date. While I could just create a bunch of classes I'd like to start learning more on interfaces and abstraction in php. So if I take the scan directory class as the first example I have several methods... ScanForFiles($path) FindMD5Checksum() FindAllImageTypes() getFileList() The scanForFiles could be public to allow anyone to access it and it stores in an object the entire directory list of files found and many details about them. example extension, size, filename, path, etc... The FindMD5Checksum runs against the fileList object created from scanForFiles and adds the md5 if needed. The FindAllImageTypes runs against the fileList object as well and adds if they are image types. The findmd5checksum and findallimagetypes are optionally run methods because the user might not intend to run these all the time or at all. The getFileList returns the fileList object itself. While I have a working copy I've revamped it a few times trying to figure out whether I need to go with an interface or abstract or both. I'd like to know how an expert OO developer would design it and why?

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  • hibernate criteria list problem [migrated]

    - by user1022676
    I have a user dao @Entity @Table(name="EBIGUSERTIM") public class EbigUser { private String id; private Integer source; private String entryscheme; private String fullName; private String email; private Long flags; private String status; private String createdBy; private Date createdStamp; private String modifiedBy; private Date modifiedStamp; @Id @Column(name="ID") public String getId() { return id; } public void setId(String id) { this.id = id; } @Id @Column(name="SOURCE") public Integer getSource() { return source; } public void setSource(Integer source) { this.source = source; } @Column(name="ENTRYSCHEME") public String getEntryscheme() { return entryscheme; } public void setEntryscheme(String entryscheme) { this.entryscheme = entryscheme; } @Column(name="FULLNAME") public String getFullName() { return fullName; } public void setFullName(String fullName) { this.fullName = fullName; } @Column(name="EMAIL") public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Column(name="FLAGS") public Long getFlags() { return flags; } public void setFlags(Long flags) { this.flags = flags; } @Column(name="STATUS") public String getStatus() { return status; } public void setStatus(String status) { this.status = status; } @Column(name="CREATEDBY") public String getCreatedBy() { return createdBy; } public void setCreatedBy(String createdBy) { this.createdBy = createdBy; } @Column(name="CREATEDSTAMP") public Date getCreatedStamp() { return createdStamp; } public void setCreatedStamp(Date createdStamp) { this.createdStamp = createdStamp; } @Column(name="MODIFIEDBY") public String getModifiedBy() { return modifiedBy; } public void setModifiedBy(String modifiedBy) { this.modifiedBy = modifiedBy; } @Column(name="MODIFIEDSTAMP") public Date getModifiedStamp() { return modifiedStamp; } public void setModifiedStamp(Date modifiedStamp) { this.modifiedStamp = modifiedStamp; } i am selecting 2 rows out of the db. The sql works select * from ebigusertim where id='blah'. It returns 2 distinct rows. When i query the data using hibernate, it appears that the object memory is not being allocated for each entry in the list. Thus, i get 2 entries in the list with the same object. Criteria userCriteria = session.createCriteria(EbigUser.class); userCriteria.add(Restrictions.eq("id", id)); userlist = userCriteria.list();

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  • Get real height of div plus css generated content (if possible)

    - by qp2wd
    I'm trying to use javascript to give three divs a negative top position equal to their height. I've got it working, sort of (thanks to help from here!) but instead of calculating the height of each div and calculating the top position accordingly, each div is being assigned a negative top position of -367px: <script type="text/javascript"> $(document).ready(function() { //Get height of footer popup var pHeight = $('footer ul li > ul').outerHeight(); //Calculate new top position based on footer popup height var nHeight = pHeight + "px"; $('footer ul li > ul').css({ //Change top position to equal height of footer popup 'top' : "-" + nHeight }); }); </script> I've tried this using .height, .outerheight, and even .getheight which someone mentioned on the Jquery documentation for .height. I also tried using an each statement, though it didn't seem to work; I may have written it incorrectly. In addition (if possible), I'd like the negative position to take into account the height of a content being generated using the css :after psuedo-property, though I can always manually add that in to the calculation if javascript has no way to access that. EDIT: Added a test page link. It's the bottom divs I'm trying to target with JS, but if anyone has an idea regarding how to fix the problem with the top divs I'd be much obliged as well. http://www.qualityprinters2.com/test/float-tab-test.html

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  • String[] initialized by null???

    - by Esmond
    Hi i encountered this problem whereby when i initialized my String[], there seems to be a null in the String[] before i do anything. How do i initialized the String[] to be completely empty,i.e. without the null at the start? The output for the following code is: nullABC nullABC nullABC nullABC nullABC public static void main(String[] args){ String[] inputArr = new String[5]; for (int i = 0; i< inputArr.length; i++){ inputArr[i] += "ABC"; } for (int i = 0; i< inputArr.length; i++){ System.out.println(inputArr[i]); } } }

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  • FTP Error: 550 Cant change directory to /: Permission denied

    - by Alessandro Merletti de Palo
    I installed Pureftpd and Ispconfig3 on my server. Starting from the point I'll probably uninstall ispconfig3 and make things directly on the server, now I am so stubborn I really want to see where's the problem. I created a ftp user through ispconfig, named amdpftp. It is related to a server user named web7. It logs in with username and password, but if i try to ls, it tells me: FTP Error: 550 Cant change directory to /: Permission denied I thought many things, like: 1. It is a problem of permissions. I went to /var/www/clients/client0/web7 , it was immutable and owned by root. Chattr -i and chown web7:client0 changed permissions, but with no effect. I restored to root:root, and made it immutable again. 2. I make some mistakes in the pureftpd installation: Wrong, it works pretty fine. The pureftpd.log doesn't seem to say anything bad. 3. The pureftpd.log file is only the pureftpd one, I should also check the mysqld functionality, as it is in a mysql database that user, password and working directory are stored. I enabled logging in the my.cnf, but also in the ispconfig database operation there wasn't anything wrong. Then I mkdir testftp in /var/www, chown web7:client0, and edited amdpftp user root directory from /var/www/clients/client0/web7 into /var/www/testftp . Guess what? It worked. So, now I know: 1. The PureFtpd works pretty fine 2. The mysql ispconfig database as well 3. The username and password of the virtual user created by ispconfig into pureftpd work 4. The correlation between username and password and the user web7 and the group client0 does work. What kind of magic has been cast upon the ispconfig directories [/var/www/clients/*] that block ftpusers to operate?

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  • Importing XML into an AWS RDS instance

    - by RoyHB
    I'm trying to load some xml into an AWS RDS (mySql) instance. The xml looks like: (it's an xml dump of the ISO-3661 codes) <?xml version="1.0" encoding="UTF-8"?> <countries> <countries name="Afghanistan" alpha-2="AF" alpha-3="AFG" country-code="004" iso_3166-2="ISO 3166-2:AF" region-code="142" sub-region-code="034"/> <countries name="Åland Islands" alpha-2="AX" alpha-3="ALA" country-code="248" iso_3166-2="ISO 3166-2:AX" region-code="150" sub-region-code="154"/> <countries name="Albania" alpha-2="AL" alpha-3="ALB" country-code="008" iso_3166-2="ISO 3166-2:AL" region-code="150" sub-region-code="039"/> <countries name="Algeria" alpha-2="DZ" alpha-3="DZA" country-code="012" iso_3166-2="ISO 3166-2:DZ" region-code="002" sub-region-code="015"/> The command that I'm running is: LOAD XML LOCAL INFILE '/var/www/ISO-3166_SMS_Country_Codes.xml' INTO TABLE `ISO-3661-codes`(`name`,`alpha-2`,`alpha-3`,`country-code`,`region-code`,`sub-region-code`); The error message I get is: ERROR 1148 (42000): The used command is not allowed with this MySQL version The infile that is referenced exists, I've selected a database before running the command and I have appropriate privileges on the database. The column names in the database table exactly match the xml field names.

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  • Regular issue with keys on temp tables

    - by Christian
    We run a large forum with lots of reads and writes, particularly to the posts and topics tables which are both innodb. Last week I started doing 12 hourly backups with innobackupex because mysqldump just takes forever (7+ million rows in posts table.) It seems that something doesn't like these backups because I have a recurring problem every other day. The symptoms; The front page of the site starts throwing errors The logs start showing errors like Error: 126 - Incorrect key file for table '/tmp/mysql/#sql_4e87_14.MYI'; try to repair it The /tmp/ dir fills up and we start getting Error: 1030 - Got error 28 from storage engine in the logs. The only way to fix is to optimize table on each of the posts and topics tables. I'm trying all I can to stop MySQL using disks for temp tables, but I'd have more problems than this if it used all my memory also. My my.cnf is here; https://gist.github.com/cbiggins/0aa26f6defb7a14541d7 The box has 32GB memory and I don't come near that usually. Currently at 15GB use. Thanks in advance. Update 1: Despite the conf looking like there is replication, there isn't. This is a stand alone instance.

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  • Storing changes to multiple databases in a single centralized database

    - by B4x
    The setup: multiple MySQL databases at different locations with the same scheme. The databases are in production. The motivation: we want to present information in these databases in a web interface, clearly showing which database the row originated from. We want to be able to get this data from one single source (for different reasons, one of them is pagination which gets tricky if you use multiple sources). The problem: how do we collect data from multiple databases, storing it at a central location and clearly marking the origin of each row? We have discussed using a centralized DB that tracks changes to the production DBs, with the same schema and one additional column for origin. If possible, we would like to avoid having to make changes in the production environment. Since we can't use MySQL's replication (multiple masters to a single slave isn't allowed), what are our other options? Are there any existing solutions for something like this or do we have to code something ourselves? Is the best solution to change the database schemas in production and add a column for origin? The idea of a centralized database isn't set in stone. If there is a solution to this that solves our other problems without a centralized DB, we can be flexible. Any help is much appreciated.

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