Java RealmSchema.get方法代码示例

import io.realm.RealmSchema; //导入方法依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
    // During a migration, a DynamicRealm is exposed. A DynamicRealm is an untyped variant of a normal Realm, but
    // with the same object creation and query capabilities.
    // A DynamicRealm uses Strings instead of Class references because the Classes might not even exist or have been
    // renamed.

    // Access the Realm schema in order to create, modify or delete classes and their fields.
    RealmSchema schema = realm.getSchema();

    // Migrate from version 0 to version 1
    if (oldVersion == 0) {

        oldVersion++;
    }

    // Migrate from version 1 to version 2
    if (oldVersion == 1) {
        RealmObjectSchema bloodGlucoseDataSchema = schema.get("BloodGlucoseData");
        bloodGlucoseDataSchema
                .addField("timezoneOffsetInMinutes", int.class)
                .transform(timezoneTransformFunction);

        //oldVersion++;
    }
}
 

import io.realm.RealmSchema; //导入方法依赖的package包/类
@Override
public void migrate(final DynamicRealm realm, long oldVersion, long newVersion) {
	// During a migration, a DynamicRealm is exposed. A DynamicRealm is an untyped variant of a normal Realm, but
	// with the same object creation and query capabilities.
	// A DynamicRealm uses Strings instead of Class references because the Classes might not even exist or have been
	// renamed.

	// Access the Realm schema in order to create, modify or delete classes and their fields.
	RealmSchema schema = realm.getSchema();

	if(oldVersion==1){

		RealmObjectSchema settingSchema = schema.get("Setting");

		settingSchema.addField("locale",String.class)
				.transform(new RealmObjectSchema.Function() {
					@Override
					public void apply(DynamicRealmObject obj) {
						obj.set("locale","Auto");
					}
				});

		oldVersion++;
	}

	if(oldVersion==2){

		RealmObjectSchema cacheSchema = schema.get("NetWorkCache");

		cacheSchema.removeField("record").addField("record",String.class);

		oldVersion++;
	}
}
 

import io.realm.RealmSchema; //导入方法依赖的package包/类
@Override
public void migrate(@NonNull final DynamicRealm realm, long oldVersion, long newVersion) {
    Log.d(TAG, "Starting migration from " + oldVersion + " to " + newVersion);

    // Migration from versions < 9 not supported, versions prior 9 were missing the
    // contentHash for items
    if(oldVersion < 9) {
        throw new IllegalStateException("Migration from Schema < 9 not supported");
    }

    RealmSchema schema = realm.getSchema();

    /*
      9 -> 10

      - Add primary key ID to TemporaryFeed
      - Rename TemporaryFeed id to treeItemId
      - add TemporaryFeed object for list and pager activities
     */
    if(oldVersion == 9) {
        realm.delete("TemporaryFeed");

        final RealmObjectSchema temporaryFeedSchema = schema.get("TemporaryFeed");

        if(temporaryFeedSchema == null)
            throw new IllegalStateException("TemporaryFeed schema not found");

        temporaryFeedSchema
                .renameField(TemporaryFeed.ID, TemporaryFeed.TREE_ITEM_ID)
                .addField(TemporaryFeed.ID, long.class, FieldAttribute.PRIMARY_KEY);

        realm.createObject("TemporaryFeed", TemporaryFeed.LIST_ID);
        realm.createObject("TemporaryFeed", TemporaryFeed.PAGER_ID);

        oldVersion++;
    }

    /*
      10 -> 11

       - Make sure every item has updatedAt != null, set updatedAt = pubDate if not
     */
    if(oldVersion == 10) {
        for(DynamicRealmObject object: realm.where("Item").isNull(Item.UPDATED_AT).findAll()) {
            object.setDate(Item.UPDATED_AT, object.getDate(Item.PUB_DATE));
        }

        oldVersion++;
    }

    /*
      11 -> 12

      - Add active property to Item
     */
    if(oldVersion == 11) {
        final RealmObjectSchema itemSchema = schema.get("Item");

        if(itemSchema == null)
            throw new IllegalStateException("Item schema not found");

        itemSchema
                .addField(Item.ACTIVE, boolean.class, FieldAttribute.INDEXED);

        //noinspection UnusedAssignment
        oldVersion++;
    }
}