Question

当我尝试从Sqlite数据库中检索图像（Blob）文件时，它会给我这些错误。我使用过很多jar，比如rs2xml，sqlitejdbc-v056，sqlite-jdbc-3.8.11甚至是它的所有旧版本。这是堆栈跟踪。

java.sql.SQLException: not implemented by SQLite JDBC driver
at org.sqlite.Unused.unused(Unused.java:31)
at org.sqlite.Unused.getBlob(Unused.java:86)
at Show$2.actionPerformed(Show.java:75)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$300(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

这是我的代码

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class Show extends JFrame {

    private JPanel contentPane;
    private JTextField id;
    BufferedImage bufImg = null;
    JLabel img = null;
    InputStream in = null;
    ImageIcon imgs = null;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Show frame = new Show();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    Connection con = null;

    public Show() {
        con = dB.Connect();

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 588, 432);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        id = new JTextField();
        id.setBounds(158, 23, 86, 20);
        contentPane.add(id);
        id.setColumns(10);

        JButton show = new JButton("New button");
        show.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    String q = "select image from showme where id='" + id.getText() + "'";
                    PreparedStatement ps = con.prepareStatement(q);
                    ResultSet rs = ps.executeQuery();
                    try {
                        while (rs.next()) {
                            // problems might be occurring in here
                            Blob blob = rs.getBlob(2);
                            ImageIcon icon = new ImageIcon(blob.getBytes(2, (int) blob.length()));
                            img.setIcon(icon);
                        }
                    } catch (SQLException x) {
                        x.printStackTrace();
                    }

                    JOptionPane.showMessageDialog(null, "Done");

                    // in.close();
                    rs.close();
                    ps.close();

                } catch (Exception c) {
                    c.printStackTrace();
                }
            }
        });
        show.setBounds(302, 22, 89, 23);
        contentPane.add(show);

        img = new JLabel("");
        img.setBounds(151, 99, 325, 284);
        contentPane.add(img);
    }
}

编辑：我尝试使用Bytearray。虽然它没有向我显示任何错误，但它没有给我任何输出。！这是修改后的部分

   try {
        String q = "select image from showme where id='"+id.getText()+"'";
        PreparedStatement ps = con.prepareStatement(q);
        ResultSet rs = ps.executeQuery();       
         if(rs.next()) {
            byte[] imgss = rs.getBytes("image");
            //Resize The ImageIcon
            ImageIcon mage = new ImageIcon(imgss);
            Image im = mage.getImage();
            Image myImg = im.getScaledInstance(imgss.length, imgss.length,imgss.length);
            ImageIcon newImage = new ImageIcon(myImg);
            img.setIcon(newImage);
            JOptionPane.showMessageDialog(null, "Done");
        }
    }

Answer 1

试试这个：

byte[] byteArr = rs.getBytes("image");

Answer 2

请改用getBinaryStream()。如下所示：

ResultSet rs=ps.executeQuery();     
InputStream in = rs.getBinaryStream("image");
ByteArrayOutpuStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int bytesRead = in.read(buffer);
while (bytesRead > -1)
{
  out.write(buffer, bytesRead)
  bytesRead = in.read(buffer);
}
byte[] picture = out.toByteArray();
in.close();

您当然需要在上面添加异常处理。

如果您使用的是Apache Commons IO库，则可以使用IOUtils.toByteArray()

简化它

ResultSet rs=ps.executeQuery();     
InputStream in = rs.getBinaryStream("image");
byte[] picture = IOUtils.toByteArray(in);

Answer 3

错误：

java.sql.SQLException: not implemented by SQLite JDBC driver at org.sqlite.Unused.unused(Unused.java:31) at org.sqlite.Unused.getBlob(Unused.java:86)

是在

//problems might be occurring in here Blob blob=rs.getBlob(2);

<强> TRY：

Byte blob=rs.getByte(2);

错误java.sql.SQLException：从数据库中检索Blob（图像）时，SQLite JDBC驱动程序未实现

3 个答案: