Question

我有谷歌关于如何插入。但是得不到任何正确的答案。我必须将图像从库插入到sqlite数据库。我试过了。但是不能进行图像插入。

公共类MainActivity扩展AppCompatActivity实现AdapterView.OnItemSelectedListener，View.OnClickListener {

private static final int SELECT_PICTURE = 1;
protected static ImageView imPhoto;
DatabaseHelperAdapter databaseHelperAdapter;

Button btnSubmit;

private String selectedImagePath;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ActionBar actionBar = getSupportActionBar();
    actionBar.setTitle("Register");

    databaseHelperAdapter = new DatabaseHelperAdapter(this);



    imPhoto = (ImageView) findViewById(R.id.imPhoto);


    imPhoto.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(
                    Intent.createChooser(intent, "Select Picture"),
                    SELECT_PICTURE);
        }
    });
}

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        if (requestCode == SELECT_PICTURE) {
            Uri selectedImageUri = data.getData();
            selectedImagePath = getPath(selectedImageUri);
            System.out.println("Image Path : " + selectedImagePath);
            imPhoto.setVisibility(View.VISIBLE);
            imPhoto.setImageURI(selectedImageUri);
        }
    }
}

public String getPath(Uri uri) {
    String[] projection = {MediaStore.Images.Media.DATA};
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    int column_index = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}






//Insert into database
public void addUser(View view) throws IOException {



    byte[] byteImage1;
    FileInputStream instream = new FileInputStream(selectedImagePath);
    BufferedInputStream bif = new BufferedInputStream(instream);
    byteImage1 = new byte[bif.available()];
    bif.read(byteImage1);





    byte[] image = byteImage1;

    long id = databaseHelperAdapter.insertData(fname, lname, password, email, birthday, gender, image);

    if (id < 0) {

        Message.message(this, "Record not inserted");
    } else {
        Intent intent = new Intent(MainActivity.this, Welcome.class);
        startActivity(intent);
        Message.message(this, "Record Inserted Successfully");
    }
}


}

2]数据库文件

import java.sql.Blob;

public class DatabaseHelperAdapter {

    public SQLiteDatabase db;
    DatabaseHelper helper;

    public DatabaseHelperAdapter(Context context) {
        helper = new DatabaseHelper(context);
    }

    public long insertData(String fname, String lname, String password, String email, String birthday, String gender, byte[] image) {
        SQLiteDatabase sqLiteDatabase = helper.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(DatabaseHelper.FNAME, fname);
        contentValues.put(DatabaseHelper.LNAME, lname);
        contentValues.put(DatabaseHelper.PASSWORD, password);
        contentValues.put(DatabaseHelper.EMAIL, email);
        contentValues.put(DatabaseHelper.BIRTHDAY, birthday);
        contentValues.put(DatabaseHelper.GENDER, gender);
        contentValues.put(DatabaseHelper.IMAGE, String.valueOf(image));

        long id = sqLiteDatabase.insert(DatabaseHelper.TABLE_NAME, null, contentValues);
        sqLiteDatabase.close();
        return id;
    }

    public String getSinlgeEntry(String email) {
        SQLiteDatabase sqLiteDatabase = helper.getWritableDatabase();
        Cursor cursor = sqLiteDatabase.query(DatabaseHelper.TABLE_NAME, null, DatabaseHelper.EMAIL + " =?", new String[]{email}, null, null, null);
        if (cursor.getCount() < 1) // UserName Not Exist
        {
            cursor.close();
            return "NOT EXIST";
        }
        cursor.moveToFirst();
        String password = cursor.getString(cursor.getColumnIndex(DatabaseHelper.PASSWORD));
        cursor.close();
        return password;
    }

    public DatabaseHelperAdapter open() {

        db = helper.getWritableDatabase();
        return this;
    }

    public void close() {
        db.close();
    }

    class DatabaseHelper extends SQLiteOpenHelper {
        private static final String DATABASE_NAME = "LoginForm";
        private static final String TABLE_NAME = "LoginTable";
        private static final int DATABASE_VERSION = 2;
        private static final String UID = "_id";
        private static final String FNAME = "FName";
        private static final String LNAME = "LName";
        private static final String PASSWORD = "Password";
        private static final String EMAIL = "Email";
        private static final String BIRTHDAY = "Birthday";
        private static final String GENDER = "Gender";
        private static final String IMAGE = "Image";


        private static final String CREATE_TABLE = " CREATE TABLE " + TABLE_NAME + " ( " + UID + " INTEGER PRIMARY KEY AUTOINCREMENT , "
                + FNAME + " VARCHAR(255) , "
                + LNAME + " VARCHAR(255) ,"
                + PASSWORD + " text ,"
                + EMAIL + " VARCHAR(255) UNIQUE ,"
                + BIRTHDAY + " VARCHAR(255) ,"
                + GENDER + " VARCHAR(255)"
                + IMAGE +" BLOB );";
        private static final String DROP_TABLE = "DROP TABLE IF EXISTS " + TABLE_NAME;
        private Context context;


        public DatabaseHelper(Context context) {

            super(context, DATABASE_NAME, null, DATABASE_VERSION);
            this.context = context;
            Message.message(context, "Constructor is called");
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            try {

                db.execSQL(CREATE_TABLE);
                Message.message(context, "onCreate is called");
            } catch (SQLException e) {
                Message.message(context, "" + e);
            }
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

            try {
                Message.message(context, "onUpdates is called");
                db.execSQL(DROP_TABLE);
                onCreate(db);
            } catch (SQLException e) {
                Message.message(context, "" + e);
            }

        }

    }
}

3]错误日志：

 Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4002)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'char[] java.lang.String.toCharArray()' on a null object reference
            at java.io.File.fixSlashes(File.java:185)
            at java.io.File.<init>(File.java:134)
            at java.io.FileInputStream.<init>(FileInputStream.java:103)
            at com.example.zeronesnatik.loginform11.MainActivity.addUser(MainActivity.java:170)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4002)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
09-18 13:01:42.903    2178-2532/? W/ActivityManager﹕ Force finishing activity com.example.zeronesnatik.loginform11/.MainActivity
09-18 13:01:42.962    2178-7631/? I/OpenGLRenderer﹕ Initialized EGL, version 1.4
09-18 13:01:42.973    2178-7631/? W/EGL_emulation﹕ eglSurfaceAttrib not implemented
09-18 13:01:42.973    2178-7631/? W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0x9deff340, error=EGL_SUCCESS
09-18 13:01:43.420    2178-2199/? W/ActivityManager﹕ Activity pause timeout for ActivityRecord{3e0c9d7b u0 com.example.zeronesnatik.loginform11/.MainActivity t43 f}
09-18 13:01:44.059    2178-2334/? W/AudioTrack﹕ AUDIO_OUTPUT_FLAG_FAST denied by client

Answer 1

我认为更简单的解决方案是在数据库中仅保存SELECT_PICTURE Intent给出的Image的路径。无论如何，如果您被迫保存图像内容，我相信问题是符合的：

contentValues.put(DatabaseHelper.IMAGE, String.valueOf(image));

因为你传递给一个字节列（BLOB）一个简单的字符串。 BLOB在某种程度上是棘手的，你不能像处理简单的字符串一样处理它们。尝试使用bind语句执行这样的插入：

SQLiteStatement insertStmt      =   db.compileStatement("INSERT INTO ....");
insertStmt.clearBindings();
insertStmt.bindBlob(3, (byte[])yourImageData);
insertStmt.executeInsert();

请参阅this question以查看其他blob处理技术，例如Bitmap.CompressFormat和base64编码/解码。

Answer 2

您不应该在sqlite中保存图像或大量数据，因为它会降低性能。您可以将图像文件路径保存在数据库中，并且您想对图像执行任何操作，您可以使用 - ssh

来获取图像

图像上传在SQLite数据库Android中

2 个答案: