Question

我的应用程序读取html表，然后脚本（TableToCSV）将其转换为.csv格式。之后，我将.csv转换为sqlite数据库。之后，我在数据库上运行查询。问题是在执行时，它显示了SQLITE_BUSY;数据库文件被锁定。

这是什么原因以及如何解决这个问题？

这是我的代码 -

        final JFileChooser  fileDialog = new JFileChooser();
    JButton btnInputFile = new JButton("Input File");
    btnInputFile.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {

            int returnVal = fileDialog.showOpenDialog(rootPane);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
               java.io.File file = fileDialog.getSelectedFile();

               String name = file.getName();
               name = name.substring(0, name.lastIndexOf("."));
               name += ".html";
               File newFile = new File(file.getParentFile(), name);
               if (file.renameTo(newFile)) {
                   try {
                    TableToCSV tableToCSV = new TableToCSV(newFile, ',', '\"', '#', CSV.UTF8Charset );
                    System.out.println("action");
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
               }

               try
               {
                BufferedReader br=new BufferedReader(new FileReader("v.csv"));
                String line;

                while((line=br.readLine())!=null)
                {
                    System.out.println(line);
                    String[]value = line.split(",");
                    System.out.println(value.length);

                    String sql = "INSERT into main ([Ticket #], Status, Priority, Department, [Account Name]) "
                     + "values ('"+value[0]+"','"+value[1]+"','"+value[2]+"','"+value[3]+"','"+value[4]+"')";

                     PreparedStatement pst = DatabaseConnection.ConnectDB().prepareStatement(sql);
                     pst.executeUpdate();

                }
                br.close();

               }

               catch(Exception e)
               {
                JOptionPane.showMessageDialog(null, e);
               }

            }

        }
    });

UPDATE - DatabaseConnection.java

public class DatabaseConnection {
Connection conn = null;
Statement stmt = null;

public static Connection ConnectDB() {

    try {
        Class.forName("org.sqlite.JDBC");
        Connection conn = DriverManager.getConnection("jdbc:sqlite:database.db");
        conn.setAutoCommit(true);
        return conn;
    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);
        return null;
    }
}
}

Answer 1

这可能是由于您对sqlite数据库有多个开放引用。我首先在while循环中的finally块中关闭PreparedStatement。

PreparedStatement pst = null;
try{   
  pst = DatabaseConnection.ConnectDB().prepareStatement(sql);
  pst.executeUpdate();
}finally{
  if(pst != null) {
    pst.close();
  }
}

您还应该在所有内容结束时关闭数据库连接。如果这不能解决问题，请详细说明如何“将.csv转换为sqlite数据库”

Java - SQLITE_BUSY;数据库文件已锁定

1 个答案: