如何将图像存储在 SQLite 数据库中

问题描述

在我的应用程序中，我正在从图库上传一张图片，我想将此图片存储在 SQLite 数据库中.如何在数据库中存储位图?我正在将位图转换为字符串并将其保存在数据库中.从数据库中检索它时，我无法将该字符串分配给 ImageView，因为它是一个字符串.

In my application I am uploading an image from gallery and I want to store this image in the SQLite database. How do I store a bitmap in the database? I am converting bitmap to a string and saving it in the database. While retrieving it from the database, I am not able to assign that string to ImageView since it is a string.

Imageupload12 .java:

Imageupload12 .java:

     public class Imageupload12 extends Activity {
      Button buttonLoadImage;
      ImageView targetImage;
      int i = 0;
      Database database = new Database(this);
      String i1;
      String img;
      @Override
      public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main5);
       buttonLoadImage = (Button) findViewById(R.id.loadimage);
       targetImage = (ImageView) findViewById(R.id.targetimage);
    
    
       Bundle b = getIntent().getExtras();
       if (b != null) {
        img = b.getString("image");
        targetImage2.setImageURI("image");
        //i am getting error as i cant assign string to imageview.
    
       }
    
       buttonLoadImage.setOnClickListener(new Button.OnClickListener() {
    
        public void onClick(View arg0) {
         // TODO Auto-generated method stub
         Intent intent = new Intent(Intent.ACTION_PICK,
          android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
         Log.i("photo", "" + intent);
         startActivityForResult(intent, i);
         i = i + 1;
        }
       });
    
      }
    
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    
       // TODO Auto-generated method stub
       super.onActivityResult(requestCode, resultCode, data);
       switch (requestCode) {
    
        case 0:
         if (resultCode == RESULT_OK) {
          Uri targetUri = data.getData();
          //             textTargetUri.setText(targetUri.toString());
          Bitmap bitmap;
          try {
           bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(targetUri));
           targetImage.setImageBitmap(bitmap);
    
           i1 = bitmap.toString();
           Log.i("firstimage........", "" + i1);
           targetImage.setVisibility(0);
    
           SQLiteDatabase db = database.getWritableDatabase();
           db.execSQL("INSERT INTO UPLOAD VALUES('" + i1 + "');");
    
          } catch (FileNotFoundException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
          }
         }
         break;
    
    
    
       }
    
      }
     }

Image.class:

Image.class:

    public class Image extends Activity {
     Database database = new Database(this);
     static EfficientAdapter adapter, adapter1;
     static ListView lv1;
    
     static SQLiteDatabase db;
     static EfficientAdapter adp;
     static Cursor c1;
    
     static Vector < String > IMAGE = new Vector < String > ();
    
     @Override
     public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
    
      db = database.getReadableDatabase();
      c1 = db.rawQuery("select * from UPLOAD;", null);
    
      if (c1.moveToFirst()) {
    
       do {
        IMAGE.add(c1.getString(0).toString());
    
       } while (c1.moveToNext());
    
       c1.close();
      }
    
      lv1 = (ListView) findViewById(R.id.List);
    
      adapter = new EfficientAdapter(this);
    
    
      lv1.setAdapter(adapter);
    
      ImageView add = (ImageView) findViewById(R.id.imv1a);
    
    
    
      add.setOnClickListener(new OnClickListener() {
    
       @Override
       public void onClick(View v) {
        // TODO Auto-generated method stub
        IMAGE.clear();
    
        Intent i = new Intent(Image.this, Imageupload12.class);
        startActivity(i);
    
    
       }
      });
    
    
     }
    
    
    
     private static class EfficientAdapter extends BaseAdapter {
    
    
      //        protected  final Context Context = null;
      protected LayoutInflater mLayoutInflater;
      AlertDialog.Builder aBuilder;
      public EfficientAdapter(Context context) {
       // TODO Auto-generated constructor stub
       mLayoutInflater = LayoutInflater.from(context);
      }
    
      @Override
      public int getCount() {
       // TODO Auto-generated method stub
    
       return IMAGE.size();
      }
    
      @Override
      public Object getItem(int position) {
       // TODO Auto-generated method stub
       return position;
      }
    
      @Override
      public long getItemId(int position) {
       // TODO Auto-generated method stub
       return position;
      }
    
      @Override
      public View getView(final int position, View convertView, ViewGroup parent) {
       // TODO Auto-generated method stub
    
       final ViewHolder mVHolder;
       if (convertView == null) {
        convertView = mLayoutInflater.inflate(R.layout.pjtlistdetails, parent, false);
    
        mVHolder = new ViewHolder();
    
        mVHolder.t1 = (TextView) convertView.findViewById(R.id.pjtdetails);
        mVHolder.time = (TextView) convertView.findViewById(R.id.name);
    
    
        mVHolder.imv = (ImageButton) convertView.findViewById(R.id.editic);
        mVHolder.imvd = (ImageView) convertView.findViewById(R.id.delete);
        mVHolder.imvf = (ImageView) convertView.findViewById(R.id.fwd);
    
    
    
    
    
        mVHolder.imv.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
    
    
    
          String img = IMAGE.elementAt(position);
          Log.i("image...", "" + img);
    
          Context ctx = v.getContext();
          Intent myIntent = new Intent();
          ctx = v.getContext();
          myIntent.setClass(ctx, Imageupload12.class);
          myIntent.putExtra("image", img);
    
          ctx.startActivity(myIntent);
    
          IMAGE.clear();
    
         }
        });
        static class ViewHolder {
    
         ImageButton imv;
         ImageView imvd, imvf;
        }
       }
      }
     }
    }

推荐答案

你必须使用blob"来存储图像.

You have to use "blob" to store image.

例如:将图像存储到数据库中:

ex: to store a image in to db:

public void insertImg(int id , Bitmap img ) {   


    byte[] data = getBitmapAsByteArray(img); // this is a function

    insertStatement_logo.bindLong(1, id);       
    insertStatement_logo.bindBlob(2, data);

    insertStatement_logo.executeInsert();
    insertStatement_logo.clearBindings() ;

}

 public static byte[] getBitmapAsByteArray(Bitmap bitmap) {
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    bitmap.compress(CompressFormat.PNG, 0, outputStream);       
    return outputStream.toByteArray();
}

从数据库中检索图像:

public Bitmap getImage(int i){

    String qu = "select img  from table where feedid=" + i ;
    Cursor cur = db.rawQuery(qu, null);

    if (cur.moveToFirst()){
        byte[] imgByte = cur.getBlob(0);
        cur.close();
        return BitmapFactory.decodeByteArray(imgByte, 0, imgByte.length);
    }
    if (cur != null && !cur.isClosed()) {
        cur.close();
    }       

    return null;
} 

这篇关于如何将图像存储在 SQLite 数据库中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持html5模板网！