用java 对 oracle 中的 image 存取
package data;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.sql.Blob;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class BlobTest { public void insertBlob(String imageId, String fileName) { Connection conn = null; try { conn = getConnection(); if (!fileName.equals("")) { PreparedStatement ps = conn.prepareStatement("INSERT INTO IMAGES VALUES(?, ?)"); ps.setString(1, imageId); FileInputStream fis = new FileInputStream(fileName); ps.setBinaryStream(2, fis, fis.available()); ps.execute(); ps.close(); } else { PreparedStatement ps = conn.prepareStatement("INSERT INTO IMAGES VALUES (?, empty_blob())"); ps.setString(1, imageId); ps.execute(); ps.close(); } conn.close(); } catch (Exception e) { e.printStackTrace(); } } public void readBlob(String fileName) { Connection conn = null; try { conn = getConnection(); Statement st = conn.createStatement(); ResultSet rs = st.executeQuery("SELECT IMAGE FROM IMAGES"); while (rs.next()) { // The following two lines can be replaced by // InputStream is = rs.getBinaryStream(1); Blob blob = rs.getBlob(1); InputStream is = blob.getBinaryStream(); FileOutputStream fos = null; fos = new FileOutputStream("c:/TEMP/" + fileName); byte[] data = new byte; int i = 0; while ((i = is.read(data)) != -1) { fos.write(data, 0, i); } } conn.close(); } catch (Exception e) { e.printStackTrace(); } } public void writeBlob(String fileName) { Connection conn = null; try { conn = getConnection(); Statement st = conn.createStatement(); ResultSet rs = st.executeQuery("SELECT IMAGE FROM IMAGES FOR UPDATE"); while (rs.next()) { Blob blob = rs.getBlob(1); System.out.println(blob); OutputStream os = blob.setBinaryStream(1); FileInputStream fis = null; fis = new FileInputStream("c:/TEMP/" + fileName); byte[] data = new byte; int i; while ((i = fis.read(data)) != -1) { os.write(data, 0, i); } os.close(); break; } conn.close(); } catch (Exception e) { e.printStackTrace(); } } private Connection getConnection() throws ClassNotFoundException, SQLException { Class.forName("oracle.jdbc.driver.OracleDriver"); Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL", "scott", "tiger"); return conn; } public static void main(String[] args) { BlobTest blobTest = new BlobTest(); blobTest.insertBlob("img1", ""); blobTest.writeBlob("2.gif"); }}
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