org.dbflute.dbmeta.accessory

インタフェース DerivedMappable

既知の実装クラスのリスト:

AbstractEntity

public interface DerivedMappable

The interface of derived mappable object (basically entity), for (Specify)DerivedReferrer.

導入されたバージョン:

1.0.5J (2014/06/18 Wednesday)

作成者:

jflute

フィールドのサマリー

フィールド

修飾子とタイプ	フィールドと説明
static String	MAPPING_ALIAS_PREFIX The prefix mark for derived mapping alias.

メソッドのサマリー

修飾子とタイプ	メソッドと説明
<VALUE> OptionalScalar<VALUE>	derived(String aliasName, Class<VALUE> propertyType) Find the derived value from derived map by alias name (starts with '$').
void	registerDerivedValue(String aliasName, Object selectedValue) Register value derived by (Specify)DerivedReferrer.

フィールドの詳細

MAPPING_ALIAS_PREFIX

static final String MAPPING_ALIAS_PREFIX

The prefix mark for derived mapping alias.

関連項目:

定数フィールド値

メソッドの詳細

registerDerivedValue

void registerDerivedValue(String aliasName,
                          Object selectedValue)

Register value derived by (Specify)DerivedReferrer.

パラメータ:

aliasName - The alias name of derived-referrer. (NotNull)

selectedValue - The selected value from database. (NullAllowed)

derived

<VALUE> OptionalScalar<VALUE> derived(String aliasName,
                                      Class<VALUE> propertyType)

Find the derived value from derived map by alias name (starts with '$').
It needs to downcast process for getting the value so don't mistake it.s

 mapping type:
  count()      : Integer
  max(), min() : (same as property type of the column)
  sum(), avg() : BigDecimal

 e.g. use count()
  member.derived("$LOGIN_COUNT", Integer.class).alwaysPresent(loginCount -> {
      log(loginCount.getClass()); // is Integer
      ...
  });

 e.g. use max()
  member.derived("$LATEST_PURCHASE_DATETIME", LocalDateTime.class).ifPresent(latestPurchaseDatetime -> {
      log(latestPurchaseDatetime.getClass()); // is LocalDateTime
      ...
  });

 e.g. overview
  String highestAlias = "$HIGHEST_PURCHASE_PRICE";
  memberBhv.selectEntity(cb -> {
      cb.specify().derivedPurchase().max(purchaseCB -> {
          purchaseCB.specify().columnPurchasePrice();
          purchaseCB.query()...
      }, highestAlias);
      cb.query().setMemberId_Equal(1);
      ...
  }).alwaysPresent(member -> {
      ... = member.getMemberName();
      member.derived(highestAlias, Integer.class).ifPresent(highestPurchasePrice -> {
          log(highestPurchasePrice);
          ...
      });
  });
 

型パラメータ:

VALUE - The type of the value.

パラメータ:

aliasName - The alias name of derived-referrer, should start with '$'. (NotNull)

propertyType - The type of the derived property, should match as rule. (NotNull)

戻り値:

The optional property for derived value found in the map. (NotNull, EmptyAllowed: when null selected)

例外:

SpecifyDerivedReferrerInvalidAliasNameException - When the alias name does not start with '$'.

SpecifyDerivedReferrerUnknownAliasNameException - When the alias name is unknown, no derived.

SpecifyDerivedReferrerUnmatchedPropertyTypeException - When the property type is unmatched with actual type.