Oracle中插入图片并显示(用BLOB类型)
Oracle中插入图片并显示(用BLOB类型)要在oracle里面存入图片 用 blob类型
首先在数据库里建立：
--连接到管理员
conn sys/tbsoft as sysdba;
--为scott用户授权
grant create any directory to scott;
--回到scott用户
conn scott/tiger;
--创建存储图片的表
CREATE TABLE IMAGE_LOB (T_ID VARCHAR2 (5) NOT NULL,T_IMAGE BLOB NOT NULL);
--创建存储图片的目录
CREATE OR REPLACE DIRECTORY IMAGES AS 'C:\picture';
--在c：下自己建一个叫picture的文件夹
CREATE OR REPLACE PROCEDURE IMG_INSERT (TID VARCHAR2,FILENAME VARCHAR2) AS
F_LOB BFILE;--文件类型
B_LOB BLOB;
BEGIN
iNSERT INTO IMAGE_LOB (T_ID, T_IMAGE)
VALUES (TID,EMPTY_BLOB ()) RETURN T_IMAGE INTO B_LOB;
--插入空的blob
F_LOB:= BFILENAME ('IMAGES', FILENAME);
--获取指定目录下的文件
DBMS_LOB.FILEOPEN(F_LOB, DBMS_LOB.FILE_READONLY);
--以只读的方式打开文件
DBMS_LOB.LOADFROMFILE (B_LOB, F_LOB,DBMS_LOB.GETLENGTH (F_LOB));
--传递对象
DBMS_LOB.FILECLOSE (F_LOB);
--关闭原始文件
COMMIT;
END;
/
--在C:\picture下放一张图片1.gif
--将该图片存入表
call IMG_INSERT('1','1.gif');
然后创建一个web项目 连接数据库后 创建一个BlobDAO类 用来取出表中的blob类型图片
public class BlobDAO { private static final BlobDAO instance = new BlobDAO(); private Connection conn = null; private BlobDAO() { } public static BlobDAO getInstance() { return instance; } private void initConn() { conn = DBAccess.getInstance().getConn(); } public byte[] getImage(String imgname) { BufferedInputStream ins;//取得BLOB的IO流 byte[] bt = null; initConn(); Blob bo = null; PreparedStatement ps = null; ResultSet rs = null; String sql = "select T_IMAGE from IMAGE_LOB where t_id=?"; try { ps = conn.prepareStatement(sql); ps.setString(1, imgname); rs = ps.executeQuery(); if (rs.next()) { bo = rs.getBlob("T_IMAGE"); try { ins = new BufferedInputStream(bo.getBinaryStream()); int bufferSize = (int) bo.length();//取得BLOB的长度 bt = new byte; try { ins.read(bt, 0, bufferSize); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } //建立字节缓存 } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); ps.close(); conn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return bt; }}
在action里面调用getImage()方法并显示图片在页面上
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { // TODO Auto-generated method stub BlobDAO blobDAO = BlobDAO.getInstance(); byte[] bs = blobDAO.getImage("1"); try { response.getOutputStream().write(bs); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; }
添加图片到数据库
请在c盘下放入图片--c:\\4.gif
public void savaImg(String imgId) { //传的是存入数据库图片的id initConn(); Statement st = null; BLOB blob = null; //图片类型 OutputStream outputStream = null; //输出流 File file = null; //文件 InputStream inputStream = null; //输入流 ResultSet rs = null; try { conn.setAutoCommit(false); //事物由程序员操作 st = conn.createStatement(); st.executeQuery("insert into IMAGE_LOB values('"+ imgId +"',empty_blob())"); rs = st.executeQuery("select T_IMAGE from IMAGE_LOB where t_id='"+ imgId +"' for update"); if (rs.next()) { blob = (BLOB) rs.getBlob(1); outputStream = blob.getBinaryOutputStream(); file = new File("c:\\4.gif"); inputStream = new FileInputStream(file); byte[] b = new byte; int len = 0; while ((len = inputStream.read(b)) != -1) { System.out.println(len); outputStream.write(b, 0, len); } } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { inputStream.close(); outputStream.flush(); outputStream.close(); rs.close(); st.close(); conn.commit(); conn.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
操作完毕！
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