插入与读取Blob类型数据

packagecom.aff.PreparedStatement;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.io.InputStream;
importjava.sql.Blob;
importjava.sql.Connection;
importjava.sql.Date;
importjava.sql.PreparedStatement;
importjava.sql.ResultSet;
importorg.junit.Test;
importcom.aff.bean.Customer;
importcom.aff.utils.JDBCUtils;

//向数据表Customers插入Blob类型的字段
public classBlobTest {

    //向数据表customers插入Blob类型的字段
@Test
    public void testInsert() throwsException {
        Connection conn =JDBCUtils.getConnection();
        String sql = " insert into customers(name,email,birth,photo)values(?,?,?,?)";
        PreparedStatement ps =conn.prepareStatement(sql);
        ps.setObject(1, "何苗苗");
        ps.setObject(2, "hemiao@163.com");
        ps.setObject(3, "1996-2-3");
        FileInputStream is = new FileInputStream(new File("1.jpg"));
        ps.setObject(4, is);
        ps.execute();
        JDBCUtils.closeResource(conn, ps);
    }

    
    
    //查询数据表customers中的Blob类型字段
@Test
    public voidtestQuery() {
        Connection conn = null;
        PreparedStatement ps = null;
        InputStream is = null;
        FileOutputStream fos = null;
        ResultSet rs = null;
        try{
            conn =JDBCUtils.getConnection();
            String sql = "select id,name,email,birth,photo from customers where id = ?";
            ps =conn.prepareStatement(sql);
            ps.setInt(1, 20);
            rs =ps.executeQuery();
            if(rs.next()) {
                //方式一
                //int id = rs.getInt(1);
                //String name = rs.getString(2);
                //String email = rs.getString(3);
                //Date birth = rs.getDate(4);
                //方式二
                int id = rs.getInt("id");
                String name = rs.getString("name");
                String email = rs.getString("email");
                Date birth = rs.getDate("birth");

                Customer cust = newCustomer(id, name, email, birth);
                System.out.println(cust);

                //将Blob的字段下载下来，以文件的方式保存到本地
                Blob photo = rs.getBlob("photo");
                is =photo.getBinaryStream();
                fos = new FileOutputStream(new File("mm.jpg"));
                byte[] buffer = new byte[1024];
                intlen;
                while ((len = is.read(buffer)) != -1) {
                    fos.write(buffer, 0, len);
                }
            }
        } catch(Exception e) {
            e.printStackTrace();
        } finally{
            
            try{
                if(is != null)
                is.close();
            } catch(IOException e) {
                e.printStackTrace();
            }
            try{
                if(fos !=null)
                fos.close();
            } catch(IOException e) {
                e.printStackTrace();
            }
            JDBCUtils.closeResource(conn, ps, rs);
        }
    }
}