I created a software using NetBeans and SQLite database. When I clean and build, the executable jar file and database work fine. It can read and write data from the database.
Then I created .exe file using "install creator" and after installing the software, the same dist folder is created in Program files on my Windows PC. When I run the executable jar file from that dist folder, it can only read the database, but can't write. I get this message
java.sql.SQLException:attempt to write a readonly database
Can anyone please help me solve this problem? Thanks in advance.
check this
The problem, as it turns out, is that the PDO SQLite driver requires that if you are going to do a write operation (INSERT,UPDATE,DELETE,DROP, etc), then the folder the database resides in must have write permissions, as well as the actual database file.
I found this information in a comment at the very bottom of the PDO SQLite driver manual page.
You should write the user specific data to the Application Data folder of current user.
You can get the ROAMING directory from
String path = System.getenv("APPDATA");
Or if you want to make it platform independent you can use getProperty which will give you users home directory and then you can write to specific directory:
String path = System.getProperty("user.home");
You can form the sqlite on path like
String sqliteUrl = "jdbc:sqlite:"+path+"sample.db";
Use this code line:
Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + "\\databasefile.db"
I can say this is the proper way of creating DB in application folder on to the drive like C:\ without permission
Use this code line:
Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + "\\Yourfile.db"
I can say this is the proper way of crating DB without permission on to the drive like C:\
Related
I have written a very small java code on Eclipse which will automate a small process of logging into a web system. The employees of my company use this web system to connect to office network if they are working from home.
I have converted my java project on Eclipse into an exe file, my intention is to log into that system by just a double click on the exe file.I have parameterized the userID and password and have stored it in an excel file on my local machine.
The problem am having is, My exe file will not run in any other systems except mine as my code is referring to the excel file(which has userID and password) path on my local machine. I would greatly appreciate the developers on this forum who could help me out to come up with a solution for this problem.
What about looking for the excel file in a well defined folder like C:\Users\\my-tool\credentials.xls. Or maybe look for it in the same dir as the executable?
You can get the path of the home folder of the current user with this command:
String homeDir = System.getProperty("user.home");
With that you cann assemble your custom lookup path:
Path xlsPath = Paths.get(System.getProperty("user.home"))
.resolve("my-tool")
.resolve("credentials.xls");
i am working a java app using an sqlite db, with eclipse.
i produce an executable jar with library handling: copy required libraries into a sub-folder next to generated JAR
the problem is that the app runs ok in my computer, but when i try to run it in another computer doesnt connect with the db.
(in code i put url for db E:\\ and i put also the .sqlite file in that location in my and the other computer)
String url = "E:\\";
this.dburl = "jdbc:sqlite:"+url+"\\converted.sqlite";
i want the .sqlite file to be out or jar file, so i can back it up. Any ideas?
I always like to use unix style forward slashes in path and it also work in windows. you are putting an extra slash in your db url. Try to put these file into C drive because other PC might not have an E drive. Try this:
String url = "E:/";
this.dburl = "jdbc:sqlite:"+url+"converted.sqlite";
I'm using H2 embedded database for my application. I would like to contain everything the application needs in it's own Jar, including it's database if possible. My app does not need to create temp files or anything, so basically the user just runs the Jar.
Is it possible to embed a database inside a Jar, and be able to INSERT new records as well as just SELECT out?
EDIT: Just to clarify, I'm not looking to embed the H2 driver jar inside my distributable jar, I'm looking to embed the h2 database file (someDatabase.h2.db file) inside a Jar and still be able to write/read from that database.
If you wish to embed the myDatabase.h2.db file inside the .jar, you can do so, but you'll have read-only access to the database. As .jar files are read-only, you can't modify them and therefore can't execute INSERT, DELETE or any DDL command.
That being said, below is an explanation on how to embed it read-only.
According to H2's documentation:
The JDBC URL "jdbc:h2:~/myDatabase" tells the H2 Engine to look for a database file named myDatabase.h2.db in the home directory of the current user.
The JDBC URL "jdbc:h2:file:/myDatabase" tells the H2 Engine to look for a database file named myDatabase.h2.db in the current directory (where the java program was executed).
If you embed the h2.db file inside a .jar, it is not accessible in a plain way. It is only accessible as a file inside a zip file.
In order to make H2 uset it, you have to use a zip as URL:
jdbc:h2:zip:~/data.zip!/test
See more in "Read Only Databases in Zip or Jar File".
When you embed the file as a resource in the jar, you may get it's relative url. Using...
MyClass.class.getClassLoader().getResource("myDatabase.h2.db")
...you'll get something like:
jar:file:/C:/folder1/folder2/myJar.jar!/myDatabase.h2.db
You can then manipulate it as a String and pass as JDBC URL connection to H2.
I am writing an application (basically eclipse plugin), so there are few combo-box, drop-downs etc, which I am getting values for them dynamically via XML file. My doubt is which is the best way to store these files in a particular directory so that it can be read in both Windows as well as Linux.
Initially I tried to create a config path under {eclipse.home.location} like:
String finalPath = System.getProperty("eclipse.home.location") +"/myAppConfig";
and store all of my plugin's configuration there (not only configuration but few helper jars which I programatically read in my plugin). But there is a probabilty that Eclipse installation maybe in shared location and user may not have write access to it.
I also tried to store it in a program files directory using:
System.getenv("ProgramFiles");
But this fails under non-windows environments. So my question is can anyone shed a light on this so that I can store in some common directory where it is valid for both windows and linux?
Kindly let me know if my wordings are confusing. Or is it possible to store my config files under plugins directory and get the path like this /plugins/myConfigDir ?
Try using the getStateLocation() method in Plugin.
That will give you an IPath that points to a user specific workspace location.
I actually can't believe I'm saying this but since porting my programs to OSX and getting used to permissions, I've realized that what I planned to do on Windows will not work how I want it to. Currently, on windows, my program stores it's setting's in the registry (HKLM) and some user editable resources in a folder next to the program file. For various reasons, I have now decided that the configuration/settings will be stored in a file and the user will be able to in which folder the other resources are kept.
So the question I have now is where to store the configuration file. Obviously it will be updated, but I don't want to program to have to require administrator permissions to run. I would like to offer an option so that all users can use the program (like most programs do), which will of course require Admin, so this leads be onto the second query: where should I store the configuration file (and the folder in which other resources are kept) and how can I detect whether the program has been installed for all users or just one!
Thanks in advance
PS If you didn't guess, the program is written in Java so I would like to know how to programatically get the location you suggest as well please.
Its normal practice in *nix compatible programs to store information in folders starting with name . in the home directory of the users like,
.bash_history
.bashrc
You could use the same on OSX in my opinion and create a directory say,
.myapp
You can store any number of files with any format under that directory.
To get the location of the folder, you can do
String homeDir = System.getProperty("user.home");
File myAppDir = new File(homeDir, ".myapp");
That is roughly the code that can get you your custom config directory for your app.
Please not that dot files / folders are somewhat similar to hidden folders in windows. Your File Manager will not generally show these files / folders by default.
To identify if the program is installed for all the users or not, you could create the configuration at some administrator (root) controlled location like /etc (not sure about Mac) The user configuration can always override the default config. There could be a better way to handle this though.
On both windows and unix, User(usually) has a (home)folder to which it has full permissions. You may create a directory in the home folder and have your user configuration files reside there.