How to store an image file to SQliteDB in android

根据上一篇转载内容我自己尝试着把一个image文件存入到sqlite中，并且把它读出来。

从数据库中读出的文件放在以下路径：/data/data/packagename/files。

完整代码如下：

package com.test.image;

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;

public class ImageStoreActivity extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
    
    private static final String DB_NAME = "mp3Song.db";
    
    private static final int DB_VERSION = 2;
    
    private Button btn, btn2, btn3;
    
    private Cursor cur;
    
    private MediaPlayer mPlayer;
    
    private static class DatabaseHelper extends SQLiteOpenHelper {
        
        DatabaseHelper(Context context) {
            super(context, DB_NAME, null, DB_VERSION);
        }
        
        @Override
        public void onCreate(SQLiteDatabase db) {
        }
        
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        }
        
    }
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setContentView(R.layout.main);
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);
        
        btn = new Button(this);
        btn.setId(101);
        btn.setText("show");
        // btn.setBackgroundResource(resid);
        btn.setOnClickListener(this);
        LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(80, 50);
        param.topMargin = 10;
        layout.addView(btn, param);
        setContentView(layout);
        
        btn2 = new Button(this);
        btn2.setId(102);
        btn2.setText("retrieve");
        btn2.setOnClickListener(this);
        layout.addView(btn2, param);
        
        // init();
        setTitle("Saving into SQliteDB.");
    }
    
    private DatabaseHelper mOpenHelper;
    
    public void init() {
        mOpenHelper = new DatabaseHelper(this);
        SQLiteDatabase db = mOpenHelper.getWritableDatabase();
        String sql_drop = "drop table IF EXISTS imagetable";
        db.execSQL(sql_drop);
        
        String sql_create = "create table imagetable("
                + "pic_id text not null, " + "pic_detail blob);";
        db.execSQL(sql_create);
        
        SaveOneSong(db, "s01", R.raw.beauty);
        db.close();
        setTitle("saved in SQLiteDB.");
    }
    
   // save the image to database
    public void SaveOneSong(SQLiteDatabase db, String key, int rid) {
        ContentValues cv = new ContentValues();
        cv.put("pic_id", key);
        
        InputStream ins = getResources().openRawResource(rid);
        byte[] buffer = new byte[63 * 1024];
        try {
            int size = ins.read(buffer);
            while (size > 0) {
                ByteArrayOutputStream out = new ByteArrayOutputStream(size);
                out.write(buffer, 0, size);
                out.flush();
                out.close();
                
                cv.put("pic_detail", out.toByteArray());
                db.insert("imagetable", null, cv);
                size = ins.read(buffer);
            }
        } catch (Exception e) {
            
        } finally {
            try {
                ins.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        
    }
    
    
   // get the image file from database
    private void retrieve(String cond) {
        FileOutputStream os = null;
        try {
            os = openFileOutput("xixi.jpg", MODE_WORLD_READABLE);
        } catch (Exception e) {
            
        }
        byte red_buf[];
        mOpenHelper = new DatabaseHelper(this);
        SQLiteDatabase db = mOpenHelper.getReadableDatabase();
        String col[] = {"pic_id", "pic_detail"};
        Cursor c = db.query("imagetable", col, cond, null, null, null, null);
        int k = 0;
        c.moveToFirst();
        try {
            while (!c.isAfterLast()) {
                red_buf = c.getBlob(1);                
                os.write(red_buf);
                k++;
                c.moveToNext();
            }
            os.flush();
            os.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
    
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case 101:
            init();
            break;
        case 102:
            retrieve("pic_id='s01'");
            break;
        }
    }
}