数据库开源框架之sqlcipher加密数据库

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访问github链接:https://github.com/sqlcipher/android-database-sqlcipher

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访问 http://sqlcipher.net/sqlcipher-for-android/ 查看官方介绍,
并从官方介绍中找出编译成功之后的zip压缩包进行下载
https://s3.amazonaws.com/sqlcipher/SQLCipher+for+Android+v3.1.0.zip

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普通数据库

public interface MyDB {

    String name = "my.db";
    int version = 1;

    public interface MyTable {
        String name = "test";
        String column_id = "_id";
        String column_name = "name";
        String create_sql = "create table " + name + "(" + column_id
                + " integer primary key autoincrement, " + column_name
                + " text)";
    }
}

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public class NativeOpenHelper extends SQLiteOpenHelper {

    public NativeOpenHelper(Context ctx) {
        super(ctx, MyDB.name, null, MyDB.version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(MyTable.create_sql);
    }

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

    }
}

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public class NativeDao {

    private NativeOpenHelper mHelper;

    public NativeDao(Context ctx) {
        mHelper = new NativeOpenHelper(ctx);
    }

    public void add(String name) {
        SQLiteDatabase database = mHelper.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(MyTable.column_name, name);
        database.insert(MyTable.name, null, values);
        database.close();
    }
}

经过加密的数据库

public interface SafeDB {

    String name = "safe.db";
    int version = 1;

    public interface SafeTable {
        String name = "test";
        String column_id = "_id";
        String column_name = "name";
        String create_sql = "create table " + name + "(" + column_id
                + " integer primary key autoincrement, " + column_name
                + " text)";
    }

}

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public class SafeDao {

    private SafeOpenHelper mHelper;

    public SafeDao(Context ctx) {
        mHelper = new SafeOpenHelper(ctx);
    }

    public void add(String name) {
        SQLiteDatabase database = mHelper.getWritableDatabase("123456");
        ContentValues values = new ContentValues();
        values.put(SafeTable.column_name, name);
        database.insert(SafeTable.name, null, values);
        database.close();
    }

    public void query() {
        SQLiteDatabase database = mHelper.getWritableDatabase("123456");
        Cursor cursor = database.query(SafeTable.name,
                new String[] { SafeTable.column_name }, null, null, null, null, null);

        if (cursor != null) {
            while (cursor.moveToNext()) {
                String name = cursor.getString(0);
                System.out.println(name);
            }

            cursor.close();
        }

        database.close();
    }
}

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import android.content.Context;
import com.loaderman.sqlitedemo.SafeDB.SafeTable;

public class SafeDBHelper extends net.sqlcipher.database.SQLiteOpenHelper {

    public SafeDBHelper(Context ctx) {
        super(ctx, SafeDB.name, null, SafeDB.version);
    }

    @Override
    public void onCreate(net.sqlcipher.database.SQLiteDatabase db) {
        db.execSQL(SafeTable.create_sql);
    }

    @Override
    public void onUpgrade(net.sqlcipher.database.SQLiteDatabase arg0, int arg1,
                          int arg2) {

    }

}

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public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //加载本地库
        SQLiteDatabase.loadLibs(this);
    }

    public void normalDB(View view) {
        NativeDao dao = new NativeDao(this);
        dao.add("hahahhaha");
    }

    public void safeDB(View view) {
        SafeDao dao = new SafeDao(this);
        dao.add("hehehheheheh");
        dao.query();
    }
}

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发现导出来的数据库文件,一个看到数据,一个看不到数据