将sqlite DB添加到可执行的JAR文件中

Question

I am using JAVA (with eclipse juno) and try to create an executable JAR file which include sqlite DB file. I've try to get connection to the DB by this line:

DriverManager.getConnection("jdbc:sqlite:"+DataController.class.getResource("test.sqlite").getPath())

The DataController is a class that located where the sqlite located.

and i keep get an error:

java.sql.SQLException: invalid database address

Does someone can help and give step by step instructions about how to include sqlite DB inside an executable JAR file?

Answer 1

Apparently sqlite-jdbc can open resources on it's own. Per this thread https://groups.google.com/forum/?fromgroups=#!topic/xerial/Oayzj5nrJGk , add :resource to the path. So try the following:

DriverManager.getConnection("jdbc:sqlite::resource:package/test.sqlite"); 

or depends on version of sqlite

DriverManager.getConnection("jdbc:sqlite::resource:package/test.db"); 

Replacing package with the '/' separated path to the package this file is in.

Be aware that it will actually copy the file to a tmp directory.-

Answer 2

The ::resource way is right. And these explanations will help if you are using ::resource but still get errors like resource database.db not found: java.net.MalformedURLException: no protocol: database.db like verdana.

Most common anwsers are: DriverManager.getConnection("jdbc:sqlite::resource:path/to/database.db")

However the path/to/database.db must be the exact path( the Path in Real File System but not in Jar ) to your jar file.

I recommend to use getClass().getResource() :

DriverManager.getConnection("jdbc:sqlite::resource:" + 
        getClass().getResource("/path/to/db/in/the/jar/file"))

NOTE :the /path/to/db/in/the/jar/file part must start with /

Answer 3

I'm not sure if this has changed in recent JDBC versions, but after fiddling with it for about an hour and getting various exceptions (MalformedURLException and "Database has been closed"), I found that the following worked for me:

DriverManager.getConnection("jdbc:sqlite::resource:file:/path/to/database.db")

The :file: portion seems to be missing from other answers and I couldn't get it to work without it.

Also, note that the

/path/to/database.db

is the absolute path starting from the root of the .jar file, rather than a normal resource root.

Answer 4

jdbc:sqlite::resource:notes_app.db

worked for me. My database(notes_app.db) was in the root of generated jar file.

public class Database {
    public static Connection con () throws SQLException {
        String url = "jdbc:sqlite::resource:notes_app.db";
        return DriverManager.getConnection(url);
    }
}

My notes_app.db is in the root of generated jar. I'm developing with maven and notepadd++