greenDao orm 進階

greenDao 支持 枚舉類型

Note.class

    @Entity(indexes = {
        @Index(value = "text, date DESC", unique = true)
    })
    public class Note {

        @Id(autoincrement = true)
        private Long id;

        @NotNull
        private String text;
        private String comment;
        private java.util.Date date;

        @Convert(converter = NoteTypeConverter.class, columnType = String.class)
        private NoteType type;
    }

NoteType.class

public enum NoteType {
    TEXT, LIST, PICTURE
}

NoteTypeConverter.class

public class NoteTypeConverter implements PropertyConverter<NoteType, String> {
    @Override
    public NoteType convertToEntityProperty(String databaseValue) {
        return NoteType.valueOf(databaseValue);
    }

    @Override
    public String convertToDatabaseValue(NoteType entityProperty) {
        return entityProperty.name();
    }
}

查詢

高級查詢

    查詢條件：
    First name is "Joe" 
    AND(
        year of birth is greater than 1970 
        OR(
        year of birth is 1970 AND month of birth is equal to or greater than 10)
    )
『firstname 等於Joe，而且（此人1970年後出生或者1970年10月以後出生）』

QueryBuilder<User> qb = userDao.queryBuilder();
qb.where(Properties.FirstName.eq("Joe"),
qb.or(Properties.YearOfBirth.gt(1970),
qb.and(Properties.YearOfBirth.eq(1970), Properties.MonthOfBirth.ge(10))));
List<User> youngJoes = qb.list();

自定義類型查詢

**greenDao 支持的默認類型**

    boolean, Boolean
    int, Integer
    short, Short
    long, Long
    float, Float
    double, Double
    byte, Byte
    byte[]
    String
    Date

其他類型參考枚舉類型 greenDao枚舉類型