oracle存入图片和文本

转贴

java操作Oracle数据库中的Clob,Blob字段

说明1:首先所有的文件都是以二进制存储
        2:二进制文件有.doc .xls .jpg
         文本文件有   .txt .html .xml

先在oracle数据库中建一张表用与测试

create table CDL_TEST
(
   SID  VARCHAR2(20) not null,
   IMG  BLOB,       //存储二进制
   DOC  CLOB,     //存储文本
  DATA NUMBER
)
-- 约束

alter table CDL_TEST
  add constraint CDL_SID primary key (SID)


测试代码如下:

 package DataBaseUtil;
 import java.sql.*;
 import java.util.Scanner;
 import java.io.*;
 import oracle.sql.BLOB;

 class InitDB{
  private static Connection con=null;
  private static Statement stmt=null;
  private static ResultSet rs=null;
 InitDB(){
   try{
   Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
       String url="jdbc:oracle:thin:@localhost:1521:ORCL";  //ORCL 是sid
   String user="cdl";
   String password="1";
  con= (Connection) DriverManager.getConnection(url,user,password);
  InitDB.setCon(con);
   }catch(Exception e){
   e.printStackTrace();
  }
 }

  public void closCon(){
   try{
   con.close();
   }catch(Exception e){
   e.printStackTrace();
  }
 }
  public void stmt(){
   try{
   con.close();
   }catch(Exception e){
   e.printStackTrace();
  }
 }
  public void rs(){
   try{
   con.close();
   }catch(Exception e){
   e.printStackTrace();
  }
 }

  public static Connection getCon() {
   return con;
 }

  public static void setCon(Connection con) {
  InitDB.con = con;
 }

  public static ResultSet getRs() {
   return rs;
 }

  public static void setRs(ResultSet rs) {
  InitDB.rs = rs;
 }

  public static Statement getStmt() {
   return stmt;
 }

  public static void setStmt(Statement stmt) {
  InitDB.stmt = stmt;
 }
}

 /*
 * 插入Blob数据 如:图片
 */
 class InsertBlobData{
  private ResultSet rs=null;
  private InitDB idb=null;
 InsertBlobData(){
    idb=new InitDB();
 }
  public  void insertBlob(String sql1) throws SQLException{
  Connection con=idb.getCon();
   try{
    con.setAutoCommit(false);//不设置自动提交
    BLOB blob = null; //插入空的Blob
    PreparedStatement pstmt = con.prepareStatement("insert into cdl_test(sid,img) values(?,empty_blob())");
    pstmt.setString(1,"100");
   pstmt.executeUpdate();
   pstmt.close();
   rs=con.createStatement().executeQuery(sql1);
    while(rs.next()){
      System.out.println("rs length is:");
      oracle.sql.BLOB  b=(oracle.sql.BLOB )rs.getBlob("img");
      System.out.println("cloblength is:"+b.getLength());
      File f=new File("d:\\img\\1.jpg");
      System.out.println("file path is:"+f.getAbsolutePath());
      BufferedInputStream in=new BufferedInputStream(new FileInputStream(f));
      BufferedOutputStream  out=new BufferedOutputStream(b.getBinaryOutputStream());
      int   c;
      while ((c=in.read())!=-1)   {
      out.write(c);
     }
     in.close();
     out.close();
   }
   con.commit();
   }catch(Exception e){
    con.rollback();//出错回滚
   e.printStackTrace();
  }
 }
}
 /*
 * 插入大文本如:1.txt
 */
 class InsertClobData{
  private ResultSet rs=null;
  private InitDB idb=null;
 InsertClobData(){
    idb=new InitDB();
 }
  public  void insertClob(String sql1) throws SQLException{
  Connection con=idb.getCon();
   try{
    con.setAutoCommit(false);//不设置自动提交
    BLOB blob = null; //插入空的Clob
    PreparedStatement pstmt = con.prepareStatement("insert into cdl_test(sid,doc) values(?,empty_clob())");
    pstmt.setString(1,"101");
   pstmt.executeUpdate();
   pstmt.close();
   rs=con.createStatement().executeQuery(sql1);
    while(rs.next()){
     System.out.println("sdfasdfas");
     oracle.sql.CLOB  cb=(oracle.sql.CLOB)rs.getClob("doc");
     File f=new File("d:\\doc\\1.txt");
     System.out.println("file path is:"+f.getAbsolutePath());
     BufferedWriter out = new BufferedWriter(cb.getCharacterOutputStream());
     BufferedReader in = new BufferedReader(new FileReader(f));
     int c;
     while ((c=in.read())!=-1) {
        out.write(c);
    }
    in.close();
    out.close();
   }
   con.commit();
   }catch(Exception e){
    con.rollback();//出错回滚
   e.printStackTrace();
  }
 }
}
 /*
 * 读取图片
 */
 class ReadBlobData{
  private ResultSet rs=null;
  private InitDB idb=null;
 ReadBlobData(){
    idb=new InitDB();
 }
  public void getBlob(String sql2) throws SQLException{
  Connection con=idb.getCon();
   con.setAutoCommit(false);
   try{
    System.out.println("sq2 is:"+sql2);
    System.out.println("stmt is:"+con);
   rs=con.createStatement().executeQuery(sql2);
    while(rs.next()){
     System.out.println("rs length is:");
     Blob b=(Blob)rs.getBlob("img");
     File f=new File("D:\\saveimg\\1.jpg");
     FileOutputStream fos=new FileOutputStream(f);
     InputStream is=b.getBinaryStream();//读出数据后转换为二进制流
     byte[] data=new byte[1024];
     while(is.read(data)!=-1){
     fos.write(data);
    }
    fos.close();
    is.close();
   }
   con.commit();//正式提交
   }catch(Exception e){
   e.printStackTrace();
   }finally{
    //rs.close();
  }
 }
}
 /*
 * 读取大文本
 */
 class ReadClobData{
  private ResultSet rs=null;
  private InitDB idb=null;
 ReadClobData(){
    idb=new InitDB();
 }
  public void getClob(String sql2) throws SQLException{
  Connection con=idb.getCon();
   try{
    con.setAutoCommit(false);//不设置自动提交
    System.out.println("sq2 is:"+sql2);
   rs=con.createStatement().executeQuery(sql2);
    while(rs.next()){
     oracle.sql.CLOB clob=(oracle.sql.CLOB)rs.getClob("doc");
     File f=new File("d:\\savedoc\\1.txt");
     BufferedReader in = new BufferedReader(clob.getCharacterStream());
     //setCharacterStream()方法，可用于将CLOB字段与字节流相关联，
              BufferedWriter out = new BufferedWriter(new FileWriter(f));
              int c;
              while ((c=in.read())!=-1) {
                  out.write(c);
              }
    out.close();
    in.close();
   }
   con.commit();//正式提交
  rs.close();
   }catch(Exception e){
   e.printStackTrace();
   con.rollback();
  }
 }
}
 public class TestBlob {
  public static void main(String []args){
   String sql1="select * from cdl_test  for update";//悲观锁锁定需更新的行
   String sql2="select * from cdl_test";
   System.out.println("\t\t\t欢迎使用:");
   System.out.println("1:插入图片");
   System.out.println("2:插入文本");
   System.out.println("3:读取图片");
   System.out.println("4:读取文本");
   System.out.println("5:退出");
   System.out.println("请选择:")
   while(true){
    try{
     Scanner sc=new Scanner(System.in);
     int i=sc.nextInt();
     System.out.println("sss:"+i);
     switch(i){
      case 1:
       InsertBlobData isd=new InsertBlobData();
       isd.insertBlob(sql1); break;
      case 2:
       InsertClobData icd=new InsertClobData();
       icd.insertClob(sql1); break;
      case 3:
       ReadBlobData rb=new ReadBlobData();
       rb.getBlob(sql2); break;
      case 4:
       ReadClobData rc=new ReadClobData();
       rc.getClob(sql2); break;
      case 5:
       System.exit(0);
    }
    }catch(Exception e){
    e.printStackTrace();
   }
  }
 }
}