SQLiteDatabase基本使用_writabledatabase.insert

public class DatabaseHelper extends SQLiteOpenHelper {
 
    private static final  String TABLE_NAME = "Table_data";
 
    public DatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
    }
 
    @Override
    public void onCreate(SQLiteDatabase db) {
        String sql = "create table if not exists " + TABLE_NAME + " (Id integer NOT NULL PRIMARY KEY AUTOINCREMENT, packageName text ,className text, appName text, isPermanent integer,drawableId integer,resolveInfo BLOB)";
        db.execSQL(sql);
    }
 
 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        String sql = "DROP TABLE IF EXISTS " + TABLE_NAME;
        db.execSQL(sql);
        onCreate(db);
    }
}

public class DatabaseManager {
    private final DatabaseHelper databaseHelper;
    private static final String TABLE_NAME = "Table_data";
 
    public DatabaseManager(Context context) {
        databaseHelper = new DatabaseHelper(context, "demo_db", null, 1);
    }
 
    public void insert(ContentValues contentValues) {
        SQLiteDatabase writableDatabase = databaseHelper.getWritableDatabase();
        writableDatabase.insert(TABLE_NAME, null, contentValues);
        writableDatabase.close();
    }
 
 
    public void update(ContentValues contentValues) {
        SQLiteDatabase writableDatabase = databaseHelper.getWritableDatabase();
        writableDatabase.update(TABLE_NAME, contentValues, "id=?", new String[1]);
        writableDatabase.close();
    }
 
    public void query() {
        SQLiteDatabase readableDatabase = databaseHelper.getReadableDatabase();
        Cursor cursor = readableDatabase.query(TABLE_NAME, null, "id=?", new String[]{"1"}, null, null, null);
        while (cursor.moveToNext()) {
            String id = cursor.getString(cursor.getColumnIndex("id"));
        }
        readableDatabase.close();
    }
 
    public void delete(String whereClause, String[] whereArgs) {
        SQLiteDatabase writableDatabase = databaseHelper.getWritableDatabase();
        writableDatabase.delete(TABLE_NAME, whereClause, whereArgs);
        writableDatabase.close();
    }
}