在Room数据库迁移中不是原始类型

Question

I am adding new entity FeedItem in my Room database and writing a migration for it.

Problem: I have a Date type in my FeedItem class, which is not primitive type. What is the proper way to write migration in this case?

@Entity(tableName = "FeedItem")
public class FeedItem implements Item, Votable {

private int id;
@PrimaryKey(autoGenerate = true)
@ColumnInfo(name = "feedItemRowIndex")
private int rowIndex;
private int toId;
private int fromId;
private Date date;
...

my migration currently looks like this.

private static final Migration MIGRATION_1_2 = new Migration(1, 2) {
    @Override
    public void migrate(@NonNull SupportSQLiteDatabase database) {

        database.execSQL("CREATE TABLE FeedItem (feedItemId INTEGER, " +
                "feedItemRowIndex INTEGER, " +
                "feedVotes INTEGER" +
                "feedVote INTEGER" +
                "toId INTEGER" +
                "fromId INTEGER" +
                "date Date" + // i need to change this row
                 ...
                "PRIMARY KEY (feedItemRowIndex))"

and here converter for Date type

public class DateConverter {
@TypeConverter
public static Date toDate(Long timestamp) {
    return timestamp == null ? null : new Date(timestamp);
}

@TypeConverter
public static Long toTimestamp(Date date) {
    return date == null ? null : date.getTime();
}
}

thanks!

Answer 1

If room.schemaLocation is set in your build.gradle file, then you can look at the generated schema and copy the exact sql that Room would use to create the table. Complete example here

Answer 2

This was quite easy. Room generates primitive type appropriate to converter type.

So in my case type is INTEGER. Thanks to @EpicPandaForce for comment