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Thread: jdbc and HSQL database

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    Default jdbc and HSQL database

    I am trying to connect to HSQL database using jdbc
    I want to create a properties file with url, username, password and driver.
    I am not sure what to put for the url and driver though, is it just the name of the driver or does it need the path?


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    Default Re: jdbc and HSQL database

    Please be more specific in terms of what your problem is.

    Post the code you're dealing with and the precise problems you're having. If you're weary that Marriott will penalize you for asking for help, then don't be.
    The truth is we can't help unless you give us details.
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

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    Default Re: jdbc and HSQL database

    jbdc.url=
    jbdc.username=
    jbdc.password=
    jbdc.driver=

    I am creating the .properties file with the details to access the database, i am just not to sure what should be in the url and driver section. I have the driver "hsqldb.jar" so does the driver section just want the driver name, then the url the path? or is there more to it than that.
    Last edited by wdh; October 1st, 2012 at 03:20 PM.

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    Default Re: jdbc and HSQL database

    jbdc.url=jdbc:hsqldb:file:DBNAME
    jbdc.username=sa
    jbdc.password=
    jbdc.driver=org.hsqldb.jdbcDriver

    Something like this perhaps?
    Be sure to read your laboratory documentation thoroughly, as they usually contain the answers.
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

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    Default Re: jdbc and HSQL database

    Quote Originally Posted by newbie View Post
    jbdc.url=jdbc:hsqldb:file:DBNAME
    jbdc.username=sa
    jbdc.password=
    jbdc.driver=org.hsqldb.jdbcDriver

    Something like this perhaps?
    Be sure to read your laboratory documentation thoroughly, as they usually contain the answers.
    I have used what you suggested, when trying to connect to the database however, i get this error.

    Exception in thread "main" java.sql.SQLException: The url cannot be null
    	at java.sql.DriverManager.getConnection(DriverManager.java:554)
    	at java.sql.DriverManager.getConnection(DriverManager.java:185)
    	at SimpleDataSource.getConnection(SimpleDataSource.java:48)
    	at TestDB.main(TestDB.java:18)
    Java Result: 1

    The error seems to be coming from here "SimpleDataSource.getConnection(SimpleDataSource.j ava:48)"

        public static Connection getConnection() throws SQLException
        {
            return DriverManager.getConnection(url, username, password);
        }

    The url, username and password are all read in from the properties file.

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    Default Re: jdbc and HSQL database

    Where do you read in the values from the properties file?
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

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    Default Re: jdbc and HSQL database

    See post 4 - and pay special attention to the word 'documentation'. A simple google search pulled up the following documentation page:
    Chapter12.Properties
    Have you tried what is described in that page and the API docs?

    Edit: Thread moved from "Whats wrong with my code"
    Last edited by copeg; October 1st, 2012 at 05:07 PM.

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    Default Re: jdbc and HSQL database

    Also at java-forums.org

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    Default Re: jdbc and HSQL database

    Quote Originally Posted by copeg View Post
    See post 4 - and pay special attention to the word 'documentation'. A simple google search pulled up the following documentation page:
    Chapter12.Properties
    Have you tried what is described in that page and the API docs?

    Edit: Thread moved from "Whats wrong with my code"
    Thank you, I think I may have spotted my mistake after looking through that link. I will update here tomorrow when I have chance to edit and test the new code.

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    Default Re: jdbc and HSQL database

    I still have no luck with establishing a connection.
    All files are layed out below, I am following Horstmann's example to establish a connection.
    database.properties
    jbdc.url=jdbc:hsqldb:myHSQLDB;
    jbdc.username=sa
    jbdc.password=
    jbdc.driver=org.hsqldb.jdbcDriver

    SimpleDataSource to collect database properties from file
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.SQLException;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.util.Properties;
     
    public class SimpleDataSource 
    {
        private static String url;
        private static String username;
        private static String password;
     
        public static void init(String database)
                throws IOException, ClassNotFoundException
        {
            Properties props = new Properties();
            FileInputStream in = new FileInputStream(database);
            props.load(in);
     
            String driver = props.getProperty("jdbc.driver");
            url = props.getProperty("jdbc.url");
            username = props.getProperty("jdbc.username");
            if(username == null) 
            {
                username = "";
            }
            password = props.getProperty("jdbc.password");
            if(password == null) 
            {
                password = "";
            }
     
     
        }
     
        public static Connection getConnection() throws SQLException
        {
            return DriverManager.getConnection(url, username, password);
        }
     
    }

    TestDB attempts to establish a connection to the database
    import java.sql.Connection;
    public class TestDB 
    {
        public static void main(String[] args) throws Exception
        {
            Connection conn = SimpleDataSource.getConnection();
            conn.close();
        }
    }

    When i try to establish a connection i get this message.

    Exception in thread "main" java.sql.SQLException: The url cannot be null
    	at java.sql.DriverManager.getConnection(DriverManager.java:564)
    	at java.sql.DriverManager.getConnection(DriverManager.java:221)
    	at SimpleDataSource.getConnection(SimpleDataSource.java:48)
    	at TestDB.main(TestDB.java:18)
    Java Result: 1

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    Administrator copeg's Avatar
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    Default Re: jdbc and HSQL database

    jbdc.url=jdbc:hsqldb:myHSQLDB;
    I don't see you specify the location of the database. The link I posted above explains how to do this...is it a file (jdbc:hsqldb:file:....)? Is it a URL (jdbc:hsqldb:http://...)?

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    Default Re: jdbc and HSQL database

    It is a file, Yes i have also tried jbdc.url=jdbc:hsqldb:file:myHSQLDB
    But this comes up with the same result. I have also tried using a full pathname but again this returns the same result. My understanding is that the database will be automatically created if it does not exist using the name myHSQLDB which is what i am trying to do. Assuming the rest is correct, shouldn't this work how i have described in the start of this post.

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