如何在 Room 中实现同步（Android 持久化库）

Question

在普通的sqlite中，我们可以很容易地实现同步，但是如何在Room中实现呢

Answer 1

如你所述"this is easy to achieve synchronization with SQLITE"

Room 在内部使用 SQLite 数据库。我相信 SQLite 的方法可以在 Room 中访问。因此，房间也应该很容易。

这表示 Sqlite 类已包装到 Room 类中，您可能需要编写一些管道。您使用什么来轻松同步？

Answer 2

这里是 sample，它展示了如何将 Room 与 Content Provider 结合使用，然后您可以 link (ContentProvider ) 与您的 SynchronizationAdapter 结合使用。

话虽如此，您可以像这样修改您的房间模型

@Entity(tableName = Student.TABLE_NAME) 
public class Student { 
    /** The name of the Student table. */ 
    public static final String TABLE_NAME = "student"; 


    /** The name of the ID column. */ 
    public static final String COLUMN_ID = BaseColumns._ID; 


    /** The name of the name column. */ 
    public static final String COLUMN_NAME = "name"; 


    /** The unique ID of the Student*/ 
    @PrimaryKey(autoGenerate = true) 
    @ColumnInfo(index = true, name = COLUMN_ID) 
    public long id; 


    /** The name of the Student*/ 
    @ColumnInfo(name = COLUMN_NAME) 
    public String name; 


    /** 
     * Create a new {@link Studentfrom the specified {@link ContentValues}. 
     * 
     * @param values A {@link ContentValues} that at least contain {@link #COLUMN_NAME}. 
     * @return A newly created {@link Student} instance. 
     */ 
    public static Student fromContentValues(ContentValues values) { 
        final Student student= new Student(); 
        if (values.containsKey(COLUMN_ID)) {
            student.id = values.getAsLong(COLUMN_ID); 
        } 
        if (values.containsKey(COLUMN_NAME)) { 
            student.name = values.getAsString(COLUMN_NAME); 
        }
        return student; 
    }
}

Answer 3

@Database(entities = [Student::class,Teacher::class], version = 1, exportSchema = false)
@TypeConverters(DataTypeConverter::class)
abstract class ClassDatabase : RoomDatabase() {

 // initiate database

 abstract fun studentDao()
 abstract fun teacherDao()
}

val database = ClassDatabase(context)
database.beginTransaction()
try{
   //write your operations
    database.setTransactionSuccessful()
   }
finally{
    database.endTransaction()
     }

如何在 Room 中实现同步（Android 持久化库）

How to achieve Synchronization in Room (Android persistence library)

android

android-room