Java 为字典应用程序创建数据库

我开始学习开发android应用程序。我想用android开发一本母语词典。我的问题是如何创建一个数据库来存储词汇文本、音频发音以及图片？提前谢谢

为了避免内存问题，您可以将音频和图像文件存储在SD卡中，只需将文件名保存在数据库中即可。当您需要这些文件时，只需从DB获取详细信息并从SD卡播放/显示即可。据我所知，这是最好的方法。

普通的SQLite数据库足以让你的应用程序存储音频、图片等内容，。

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要清楚，如果您要创建本机应用程序，最好使用SD卡存储图像和音频文件，这样您就可以根据需要检索文件。

SQLite将是一个合理的解决方案

如果需要连接到网络数据库，我建议在MySQL数据库所在的服务器上使用PHP脚本

下面是一些SQLite db的示例代码：

public class DatabaseHandler extends SQLiteOpenHelper {

    // All Static variables
    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "android_api";

    // Login table name
    private static final String TABLE_LOGIN = "login";

    // Login Table Columns names
    private static final String KEY_ID = "id";
    private static final String KEY_NAME = "name";
    public static final String KEY_EMAIL = "email";
    private static final String KEY_UID = "uid";
    private static final String KEY_CREATED_AT = "created_at";

    public DatabaseHandler(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    // Creating Tables
    @Override
    public void onCreate(SQLiteDatabase db) {
        String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_LOGIN + "("
                + KEY_ID + " INTEGER PRIMARY KEY,"
                + KEY_NAME + " TEXT,"
                + KEY_EMAIL + " TEXT UNIQUE,"
                + KEY_UID + " TEXT,"
                + KEY_CREATED_AT + " TEXT" + ")";
        db.execSQL(CREATE_LOGIN_TABLE);
    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_LOGIN);

        // Create tables again
        onCreate(db);
    }

    /**
     * Storing user details in database
     * */
    public void addUser(String name, String email, String uid, String created_at) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_NAME, name); // Name
        values.put(KEY_EMAIL, email); // Email
        values.put(KEY_UID, uid); // Email
        values.put(KEY_CREATED_AT, created_at); // Created At

        // Inserting Row
        db.insert(TABLE_LOGIN, null, values);
        db.close(); // Closing database connection
    }

    public void addUser(String email) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_EMAIL, email); // Email

        // Inserting Row
        db.insert(TABLE_LOGIN, null, values);
        db.close(); // Closing database connection
    }

    public String getUser() {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();

        String user = values.getAsString(KEY_EMAIL);
        Log.v("DBH", user);
        db.close();
        return user;        
    }

    /**
     * Getting user data from database
     * */
    public HashMap<String, String> getUserDetails(){
        HashMap<String,String> user = new HashMap<String,String>();
        String selectQuery = "SELECT  * FROM " + TABLE_LOGIN;

        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        // Move to first row
        cursor.moveToFirst();
        if(cursor.getCount() > 0){
            user.put("name", cursor.getString(1));
            user.put("email", cursor.getString(2));
            user.put("uid", cursor.getString(3));
            user.put("created_at", cursor.getString(4));
        }
        cursor.close();
        db.close();
        // return user
        return user;
    }

    /**
     * Getting user login status
     * return true if rows are there in table
     * */
    public int getRowCount() {
        String countQuery = "SELECT  * FROM " + TABLE_LOGIN;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        int rowCount = cursor.getCount();
        db.close();
        cursor.close();

        // return row count
        return rowCount;
    }

    public String returnRows() {
        String response = "";
        String countQuery = "SELECT * FROM " + TABLE_LOGIN;
        SQLiteDatabase db = this.getReadableDatabase();
        for (int j = 0; j < getRowCount(); j++) {
            Cursor cursor = db.rawQuery(countQuery, null);
            response += cursor.getColumnName(j);
        }
        Log.v("LT", response);
        return response;
    }

    /**
     * Re crate database
     * Delete all tables and create them again
     * */
    public void resetTables(){
        SQLiteDatabase db = this.getWritableDatabase();
        // Delete All Rows
        db.delete(TABLE_LOGIN, null, null);
        db.close();
    }

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如何检索这些音频文件和图像？你能提供编码吗？谢谢。我正在开发一本离线词典。它还能适用吗？谢谢。是的，看看addUser。SQLiteDatabase db=this.getWritableDatabase；ContentValues=新的ContentValues；values.putKEY_电子邮件，电子邮件；谢谢你的回答，克里希纳坎特·达尔！！！你有什么建议链接给我参考如何学习sqlite数据库吗？它的Dalal。无论如何，这是链接