如何将数据从Sqlite迁移到Realm

Question

我有数据存储在sqlite DB中，应用程序正在生产中。现在我想将数据从Sqlite迁移到Realm DB。我有一个原始查询从Sqlite读取数据，并在迁移到迁移类中的领域时我试图将数据存储到领域但我没有成功。任何人都可以帮助我。

public class Test extends RealmObject { 
    @PrimaryKey
    private String name;
    private String sex; 
}



//Migration Class


@Override
protected void doMigration(final DynamicRealm dynamicRealm) {
    RealmSchema realmSchema = dynamicRealm.getSchema();

    if (!realmSchema.contains("Test")) {
        RealmObjectSchema testSchema = realmSchema.create("Test");
        testSchema.addField("name", String.class, FieldAttribute.PRIMARY_KEY);
        testSchema.addField("sex", String.class);


//Trying to migrate data store data to realm from sqlite during migration itself.

 testSchema.transform(new RealmObjectSchema.Function() {
    @Override
    public void apply(final DynamicRealmObject obj) {
        if (!sqlTest.isEmpty()) {  //data from Sqlite
            for (Test tempTest : sqlTest) { //looping for sqlite data
                obj.set("name", tempTest.getName();
                obj.set("sex", tempTest.getSex());
            }
        }
     });
}

Answer 1

transform方法用于改变现有对象，例如使用默认值添加列，重命名列等等：https://realm.io/docs/java/latest/#migrations

创建模式后，需要迭代sql值并在域中添加数据，例如：

for (SqlTest sqlData : sqlTest) {
    Test test1 = realm.createObject(Test.class, UUID.randomUUID());
    test1.setName(sqlData.getName());
    test1.setSex(sqlData.getSex());
}

Answer 2

for (Test tempTest : sqlTest) {    ##sqlTest is data from Sqlite##
     DynamicRealmObject realmObject = dynamicRealm.createObject("Test", 'PrimaryKey'); 
     realmObject.set("name", tempTest.getname()); 
     realmObject.set("sex", tempTest.getsex()); 
    }