Java RealmSchema类代码示例

import io.realm.RealmSchema; //导入依赖的package包/类
/**
 * This test surfaces a bunch of problems, most of them seem to be around caching of the schema
 * during a transaction
 *
 * 1) Removing the primary key do not invalidate the cache in RealmSchema and those cached
 *    are ImmutableRealmObjectSchema so do not change when the primary key is removed.
 *
 * 2) Addding `schema.refresh()` to RealmObjectSchema.removePrimaryKey()` causes
 *    RealmPrimaryKeyConstraintException anyway. Unclear why.
 */
@Test
public void removingPrimaryKeyRemovesConstraint_typeSetters() {
    RealmConfiguration config = configFactory.createConfigurationBuilder()
            .name("removeConstraints").build();

    DynamicRealm realm = DynamicRealm.getInstance(config);
    RealmSchema realmSchema = realm.getSchema();
    realm.beginTransaction();
    RealmObjectSchema tableSchema = realmSchema.create("Employee")
            .addField("name", String.class, FieldAttribute.PRIMARY_KEY);

    realm.createObject("Employee", "Foo");
    DynamicRealmObject obj = realm.createObject("Employee", "Foo2");

    try {
        // Tries to create 2nd entry with name Foo.
        obj.setString("name", "Foo");
    } catch (IllegalArgumentException e) {
        tableSchema.removePrimaryKey();
        obj.setString("name", "Foo");
    } finally {
        realm.close();
    }
}
 

import io.realm.RealmSchema; //导入依赖的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; //导入依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
    RealmSchema schema = realm.getSchema();

    /*
     * Migrates to version 1 of the schema.
     * - Make uniqueId the primary key for the RBook class instead of the relative path.
     */
    if (oldVersion == 0) {
        schema.get("RBook")
                .removePrimaryKey() // Remove @PrimaryKey from relPath.
                .addIndex("relPath") // Add @Index to relPath.
                .addPrimaryKey("uniqueId"); // Add @PrimaryKey to uniqueId.
        oldVersion++;
    }
}
 

import io.realm.RealmSchema; //导入依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {

    // DynamicRealm exposes an editable schema
    RealmSchema schema = realm.getSchema();

    // Migrate to version 1: Add a new class.
    // Example:
    // public Person extends RealmObject {
    //     private String name;
    //     private int age;
    //     // getters and setters left out for brevity
    // }
    if (oldVersion == 0) {
        schema.create("UserScript")
                .addField("title", String.class)
                .addField("url", String.class);
        oldVersion++;
    }

    if (oldVersion == 1) {
        schema.get("UserScript")
                .addField("javascript", String.class);
        oldVersion++;
    }
}
 

import io.realm.RealmSchema; //导入依赖的package包/类
@Override
    public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {

        // DynamicRealm exposes an editable schema
        RealmSchema schema = realm.getSchema();

        // Migrate to version 1: Add a new class.
        // Example:
        // public Person extends RealmObject {
        //     private String name;
        //     private int age;
        //     // getters and setters left out for brevity
        // }
        if (oldVersion == 0) {
            schema.get("RealmContact")
                    .addPrimaryKey("idx");
//                    .addField("idx", String.class, FieldAttribute.PRIMARY_KEY);
            oldVersion++;
        }

        // Migrate to version 2: Add a primary key + object references
        // Example:
        // public Person extends RealmObject {
        //     private String name;
        //     @PrimaryKey
        //     private int age;
        //     private Dog favoriteDog;
        //     private RealmList<Dog> dogs;
        //     // getters and setters left out for brevity
        // }
        if (oldVersion == 1) {
            /*schema.get("RealmContact")
                    .addField("idx", String.class, FieldAttribute.PRIMARY_KEY)
                    .addField("name", String.class)
                    .addField("phone", String.class);
            oldVersion++;*/
        }
    }
 

import io.realm.RealmSchema; //导入依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
    RealmSchema schema = realm.getSchema();
    Log.i(TAG, "MIGRATING DATABASE from v%d to v%d", oldVersion, newVersion);

    // why < 2? because I forgot to assign a schema version until I wrote this migration, so the
    // oldVersion here will be whatever default is assigned by Realm
    if (oldVersion < 2) {
        if (!schema.get("Post").hasField("customExcerpt")) {
            Log.d(TAG, "ADDING CUSTOM EXCERPT FIELD TO POST TABLE");
            schema.get("Post").addField("customExcerpt", String.class);
        }
        oldVersion = 2;
    }
}
 

import io.realm.RealmSchema; //导入依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
    if (newVersion > oldVersion) {
        RealmSchema realmSchema = realm.getSchema();
        if (oldVersion == 1) {
            realmSchema.create("UpgradeModel")
                    .addField("localId", String.class, FieldAttribute.PRIMARY_KEY)
                    .addField("version", String.class)
                    .addField("url", String.class)
                    .addField("compulsive_upgrade", String.class)
                    .addField("description", String.class);
        }
        updateLearningModel(realmSchema);
    }
}
 

import io.realm.RealmSchema; //导入依赖的package包/类
private void updateLearningModel(RealmSchema realmSchema) {
    realmSchema.get("RealmLearningModel")
            .addField("netId", String.class)
            .addField("learningState", boolean.class)
            .addField("start", String.class)
            .addField("end", String.class)
            .addField("repeat", String.class)
            .addField("nextDay", String.class);
}
 

import io.realm.RealmSchema; //导入依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
	RealmSchema schema = realm.getSchema();

	if (oldVersion < 1) {
		schema.get("Devotional").addField("unread", boolean.class);
	}
}
 

import io.realm.RealmSchema; //导入依赖的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; //导入依赖的package包/类
@Override
public void migrate(@NonNull DynamicRealm realm, long oldVersion, long newVersion) {
    // DynamicRealm exposes an editable schema
    RealmSchema schema = realm.getSchema();

    if (schema == null) return;

    // TODO: Check in future versions if schema.get() returns null at some point

    try {
        if (oldVersion == 1) {
            schema.get("Sample")
                    .addField("version", int.class);
            oldVersion++;
        }

        if (oldVersion == 2) {
            schema.get("Device")
                    .removeField("serialNumber");
            schema.get("Sample")
                    .addField("database", int.class);
            oldVersion++;
        }
    } catch (NullPointerException e) {
        LOGE(TAG, "Schema is null!");
        e.printStackTrace();
    }
}
 

import io.realm.RealmSchema; //导入依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
    RealmSchema schema = realm.getSchema();
    Crashlytics.log(Log.INFO, TAG, "MIGRATING DATABASE from v" + oldVersion + " to v" + newVersion);

    // why < 2? because I forgot to assign a schema version until I wrote this migration, so the
    // oldVersion here will be whatever default is assigned by Realm
    if (oldVersion < 2) {
        if (!schema.get("Post").hasField("customExcerpt")) {
            Crashlytics.log(Log.DEBUG, TAG, "ADDING CUSTOM EXCERPT FIELD TO POST TABLE");
            schema.get("Post").addField("customExcerpt", String.class);
        }
        oldVersion = 2;
    }
}
 

import io.realm.RealmSchema; //导入依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
    //Mengambil schema
    RealmSchema schema = realm.getSchema();

    //membuat schema baru jika versi 0
    if (oldVersion == 0) {
        //Profil
        schema.create("Profil")
                .addField("nama", String.class)
                .addField("email", String.class)
                .addField("instansi", String.class);

        //Tugas
        schema.create("Akademik")
                .addField("judul", String.class)
                .addField("jenis", String.class)
                .addField("option", String.class)
                .addField("deadline", String.class)
                .addField("deskripsi", String.class)
                .addField("done", String.class);

        //Organisasi
        schema.create("Organisasi")
                .addField("judul", String.class)
                .addField("jenis", String.class)
                .addField("deadline", String.class)
                .addField("deskripsi", String.class)
                .addField("option", String.class)
                .addField("sebagai", String.class)
                .addField("tugas", String.class)
                .addField("presensi", String.class)
                .addField("notulensi", String.class)
                .addField("done", String.class);

        //Lainnya
        schema.create("Lainnya")
                .addField("judul", String.class)
                .addField("deadline", String.class)
                .addField("deskripsi", String.class)
                .addField("done", String.class);
        oldVersion++;
    }
}
 

import io.realm.RealmSchema; //导入依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
    // DynamicRealm exposes an editable schema
    RealmSchema schema = realm.getSchema();

    // Migrate to version 1: Add a new class.
    // Example:
    // public Person extends RealmObject {
    //     private String name;
    //     private int age;
    //     // getters and setters left out for brevity
    // }
    if (oldVersion == 0) {
        // Make updates to the schema here. For example:

        // schema.create("Person")
        //        .addField("name", String.class)
        //        .addField("age", int.class);

        // Increment so that old versions multiple steps behind get all migrations
        oldVersion++;
    }

    // Migrate to version 2: Add a primary key + object references
    // Example:
    // public Person extends RealmObject {
    //     private String name;
    //     @PrimaryKey
    //     private int age;
    //     private Dog favoriteDog;
    //     private RealmList<Dog> dogs;
    //     // getters and setters left out for brevity
    // }
    if (oldVersion == 1) {
        // Make updates to the schema here. For example:

        //schema.get("Person")
        //        .addField("id", long.class, FieldAttribute.PRIMARY_KEY)
        //        .addRealmObjectField("favoriteDog", schema.get("Dog"))
        //        .addRealmListField("dogs", schema.get("Dog"));

        // Increment so that old versions multiple steps behind get all migrations
        oldVersion++;
    }
}
 

import io.realm.RealmSchema; //导入依赖的package包/类
@Override
public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {

    // DynamicRealm exposes an editable schema
    RealmSchema schema = realm.getSchema();

    if (oldVersion == 0) {
        schema.get("Trip")
                .addField("synced", boolean.class);
        oldVersion++;
    }

    if (oldVersion == 1) {
        schema.get("StationUse")
                .addField("manualEntry", boolean.class);
        oldVersion++;
    }

    if (oldVersion == 2) {
        schema.get("Trip")
                .addField("userConfirmed", boolean.class);
        oldVersion++;
    }

    if (oldVersion == 3) {
        schema.get("Trip")
                .addField("submitted", boolean.class);
        oldVersion++;
    }

    if (oldVersion == 4) {
        schema.create("Feedback")
                .addField("id", String.class)
                .addPrimaryKey("id")
                .addField("synced", boolean.class)
                .addField("timestamp", Date.class)
                .setRequired("timestamp", true)
                .addField("type", String.class)
                .setRequired("type", true)
                .addField("contents", String.class)
                .setRequired("contents", true);
        oldVersion++;
    }

    if (oldVersion == 5) {
        schema.get("Trip")
                .addField("syncFailures", int.class);
        oldVersion++;
    }

    if (oldVersion == 6) {
        schema.create("NotificationRule")
                .addField("name", String.class)
                .setRequired("name", true)
                .addField("enabled", boolean.class)
                .addField("startTime", long.class)
                .addField("endTime", long.class)
                .addRealmListField("weekDays", Integer.class)
                .setRequired("weekDays", true);
        oldVersion++;
    }

    if (oldVersion == 7) {
        schema.get("NotificationRule")
                .addField("id", String.class)
                .addPrimaryKey("id");
        oldVersion++;
    }
}