Get String from a single cell in Ucanaccess (Java)

Question

I'm using Ucanaccess for a highschool project, and I need to get a String from a single cell in Access. I have investigated, but the only option that seems to be available is to use connection.getString(int), but that only gets the whole row.

Answer 1

First you need to download and include the ucanaccess and other accompanying jar files to your Java Project here's how you can do it.

Now let's say you have an MS Access database named UserLoginDB.accdb which (for simplicity) contains a single data table named UsersTable which consists of 3 specific columns named, ID (AutoNumber), LoginName (Text), and Password (Text). Add some fictitious data into this MS Access DB table so that this db data can be retrieved from your Java Application. Make sure one of the records in your Users Table contains this data (for demo purposes):

       LoginName:    Fred Flintstone
       Password:     123456

Close your MS Access database.

Now, given the password string of "123456" we're going to access the MS Access Database named UserLoginDB.accdb and acquire the owner (LoginName) of that password contained within the UserTable. Somewhere in your Java application (a button event or whatever) paste the following code:

String nl = System.lineSeparator();
String dbPath = "";
            
// Navigate and select the MS Access database file:
javax.swing.JFileChooser fileChooser = new javax.swing.JFileChooser(new File(".").getAbsolutePath());
javax.swing.filechooser.FileFilter filter = 
                new javax.swing.filechooser.FileNameExtensionFilter("MS Access Database", 
                "mdb", "mde", "accdb", "accde", "accdw");
fileChooser.setFileFilter(filter);
int returnVal = fileChooser.showOpenDialog(this); //(Component) evt.getSource());
if (returnVal == javax.swing.JFileChooser.APPROVE_OPTION) {
    File file = fileChooser.getSelectedFile();
    if (!file.exists()) {
        throw new IllegalArgumentException(nl + "File Selection Error!" + nl
                + "The Database file can not be found at the supplied path:" + nl
                + "(" + file.toString() + ")." + nl);
    }
    String ext = file.getName().substring(file.getName().lastIndexOf("."));
    if (!ext.equalsIgnoreCase(".mdb") && !ext.equalsIgnoreCase(".accdb")
            && !ext.equals(".accdw") && !ext.equals(".accde") && !ext.equals(".mde")) {
       throw new IllegalArgumentException(nl + "File Selection Error!" + nl
                + "The Database file selected is not a Microsoft Access Database file: "
                + "(" + file.getName() + ")." + nl);
    }

    try {
        dbPath = file.getCanonicalPath();
    }
    catch (IOException ex) {
        System.err.println(ex);
    }
}
    
String userName = "";
String password = "";
String dbURL = "";
java.sql.Connection conn = null;
try {
    dbURL = "jdbc:ucanaccess://" + dbPath + ";memory=false";
    conn = java.sql.DriverManager.getConnection(dbURL, userName, password); 
    String sql = "SELECT LoginName FROM "
            + "UsersTable WHERE Password = ?;";
    try (java.sql.PreparedStatement stmt = conn.prepareStatement(sql)) {
        stmt.setString(1, "123456");
            
        try (java.sql.ResultSet rs = stmt.executeQuery()) {
            while (rs.next()) {
                System.out.println(rs.getString("LoginName"));
            }
        }
    }
    conn.close();
}
catch (java.sql.SQLException ex) {
    System.err.println(ex);
}

The above code allows you to navigate your local file system so that you can find where you created your UserLoginDB.accdb database file and select it. Once the file dialog's Open button is selected then MS Access Database will accessed and the UsersTable queried for the Password 123456 and the name Fred FlintStone (related to this password) will be printed into the Console Window.