-
- All Known Subinterfaces:
- CachedRowSet, CallableStatement, Connection, DatabaseMetaData, DataSource, FilteredRowSet, JdbcRowSet, JoinRowSet, ParameterMetaData, PreparedStatement, ResultSet, ResultSetMetaData, RowSet, RowSetMetaData, Statement, SyncResolver, WebRowSet
- All Known Implementing Classes:
- RowSetMetaDataImpl
public interface WrapperInterface for JDBC classes which provide the ability to retrieve the delegate instance when the instance in question is in fact a proxy class.The wrapper pattern is employed by many JDBC driver implementations to provide extensions beyond the traditional JDBC API that are specific to a data source. Developers may wish to gain access to these resources that are wrapped (the delegates) as proxy class instances representing the the actual resources. This interface describes a standard mechanism to access these wrapped resources represented by their proxy, to permit direct access to the resource delegates.
- Since:
- 1.6
-
-
Method Summary
Methods Modifier and Type Method and Description booleanisWrapperFor(Class<?> iface)Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does.<T> Tunwrap(Class<T> iface)Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.
-
-
-
Method Detail
-
unwrap
<T> T unwrap(Class<T> iface) throws SQLException
Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy. If the receiver implements the interface then the result is the receiver or a proxy for the receiver. If the receiver is a wrapper and the wrapped object implements the interface then the result is the wrapped object or a proxy for the wrapped object. Otherwise return the the result of callingunwraprecursively on the wrapped object or a proxy for that result. If the receiver is not a wrapper and does not implement the interface, then anSQLExceptionis thrown.- Parameters:
iface- A Class defining an interface that the result must implement.- Returns:
- an object that implements the interface. May be a proxy for the actual implementing object.
- Throws:
SQLException- If no object found that implements the interface- Since:
- 1.6
-
isWrapperFor
boolean isWrapperFor(Class<?> iface) throws SQLException
Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does. Returns false otherwise. If this implements the interface then return true, else if this is a wrapper then return the result of recursively callingisWrapperForon the wrapped object. If this does not implement the interface and is not a wrapper, return false. This method should be implemented as a low-cost operation compared tounwrapso that callers can use this method to avoid expensiveunwrapcalls that may fail. If this method returns true then callingunwrapwith the same argument should succeed.- Parameters:
iface- a Class defining an interface.- Returns:
- true if this implements the interface or directly or indirectly wraps an object that does.
- Throws:
SQLException- if an error occurs while determining whether this is a wrapper for an object with the given interface.- Since:
- 1.6
-
-
Traduction non disponible
Les API Java ne sont pas encore traduites en français sur l'infobrol. Seule la version anglaise est disponible pour l'instant.
Version en cache
22/12/2024 10:21:08 Cette version de la page est en cache (à la date du 22/12/2024 10:21:08) afin d'accélérer le traitement. Vous pouvez activer le mode utilisateur dans le menu en haut pour afficher la dernère version de la page.Document créé le 11/06/2005, dernière modification le 04/03/2020
Source du document imprimé : https://www.gaudry.be/java-api-rf-java/sql/Wrapper.html
L'infobrol est un site personnel dont le contenu n'engage que moi. Le texte est mis à disposition sous licence CreativeCommons(BY-NC-SA). Plus d'info sur les conditions d'utilisation et sur l'auteur.
Références
Ces références et liens indiquent des documents consultés lors de la rédaction de cette page, ou qui peuvent apporter un complément d'information, mais les auteurs de ces sources ne peuvent être tenus responsables du contenu de cette page.
L'auteur de ce site est seul responsable de la manière dont sont présentés ici les différents concepts, et des libertés qui sont prises avec les ouvrages de référence. N'oubliez pas que vous devez croiser les informations de sources multiples afin de diminuer les risques d'erreurs.
