在android studio中使用sqlite。我如何创建视图?
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我怎样才能把这个翻译成android studio?或者我的dbHelper? –
使用[SQLiteDatabase](https://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html)创建一个数据库对象,然后运行一个rawQuery –
使用SQLite数据库Helper类
public class SQLiteHandler extends SQLiteOpenHelper {
private static final String TAG = SQLiteHandler.class.getSimpleName();
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_USER = "user";
// Login Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_EMAIL = "email";
private static final String KEY_UID = "uid";
private static final String KEY_CREATED_AT = "created_at";
public SQLiteHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_USER + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_EMAIL + " TEXT UNIQUE," + KEY_UID + " TEXT,"
+ KEY_CREATED_AT + " TEXT" + ")";
db.execSQL(CREATE_LOGIN_TABLE);
Log.d(TAG, "Database tables created");
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_USER);
// Create tables again
onCreate(db);
}
}
我知道这部分bro,但是在这一部分..你只是创建一个表..我需要一些示例代码来创建视图兄弟 –
那你的意思是创建视图 –
的人喜欢在MySQL? 喜欢这张 通过ORDERNUMBER ORDER BY总DESC CREATE VIEW SalePerOrder AS SELECT ORDERNUMBER ,SUM(quantityOrdered * priceEach)总 FROM ORDERDETAILS 基; 但我会用android studio .. –
你的意思是查询? –