无法将图像保存为blob到sqlite

Question

我正在使用SQLite,我无法将图像保存到数据库.这是我的代码:

File file = new File(url);
  try {
    fis = new FileInputStream(file);
  } catch (FileNotFoundException e) {}
fileLenght = (int) file.length();

stat.executeUpdate("create table "+tableName+" (id int,name String ,image Blob, features String);");
prep = conn.prepareStatement("insert into "+tableName+" values (?, ?, ?, ?);");
prep.setBinaryStream(3, fis, fileLenght);

这是我得到的错误:

java.sql.SQLException: not implemented by SQLite JDBC driver
  at org.sqlite.Unused.unused(Unused.java:29)
  at org.sqlite.Unused.setBinaryStream(Unused.java:58)

我使用以下jar:sqlitejdbc-v056.jar.

有任何想法吗？谢谢

Answer 1

您正在使用的SQLite JDBC实现未实现setBinaryStream(因此SQLite JDBC驱动程序错误消息无法准确执行).

您需要使用该setBytes方法.

Answer 2

您可以非常轻松地将图像插入数据库,说SQLite请参阅下面的代码.我确实使用了DBase Connection的属性文件,你可以放在任何地方.

public class JDBCSqliteConn
{
    public static void main(String args[]) throws FileNotFoundException, IOException
    {
        Connection connection = null;
        //ResultSet resultSet = null;
        PreparedStatement ps = null;
        String file = "C:\\Fingerprint\\histoImg_med.png";
        Properties prop = new Properties();
        int s = 0;
        byte[] person_image = null;
        File image = new File(file);
        FileInputStream fis = new FileInputStream(image);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        byte[] buf = new byte[1024];

        try {
            for (int readNum; (readNum = fis.read(buf)) != -1;)
            {
                bos.write(buf, 0, readNum);
                //no doubt here is 0
                /*Writes len bytes from the specified byte array starting at offset
                off to this byte array output stream.*/
                System.out.println("read " + readNum + " bytes,");
            }
        } catch (IOException ex) {
            System.err.println(ex.getMessage());
        }
        person_image = bos.toByteArray();

        try {
            prop.load(new FileInputStream("C:\\dbconfig.properties"));  
            Class.forName(prop.getProperty("driver"));
            connection = DriverManager.getConnection(prop.getProperty("url"));

            ps = connection.prepareStatement("INSERT INTO epmc_tbl_test_img (hhld_photo) VALUES (?)");
            ps.setBytes(1, person_image);
            s = ps.executeUpdate();
            if (s > 0)
            {
                System.out.println("Image Uploaded");
            }
            ps.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                ps.close();
                connection.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

背后的逻辑是将图像转换为bytearray然后存储到数据库,SQLite接受Image类型BLOB的字节数组

这是我的dbconfig.properties文件

driver = org.sqlite.JDBC
url = jdbc:sqlite:C:\\Ronald\\Personal\\epmc\\JavaJ2EE\\EPMC.db

尝试使用此代码.