CachedRowSet
, CallableStatement
, Connection
, DatabaseMetaData
, DataSource
, FilteredRowSet
, JdbcRowSet
, JoinRowSet
, ParameterMetaData
, PreparedStatement
, ResultSet
, ResultSetMetaData
, RowSet
, RowSetMetaData
, Statement
, SyncResolver
, WebRowSet
RowSetMetaDataImpl
public interface Wrapper
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.
Modifier and Type | Method | Description |
---|---|---|
boolean |
isWrapperFor |
Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does. |
<T> T |
unwrap |
Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy. |
<T> T unwrap(Class<T> iface) throws SQLException
unwrap
recursively on the wrapped object or a proxy for that result. If the receiver is not a wrapper and does not implement the interface, then an SQLException
is thrown.T
- the type of the class modeled by this Class objectiface
- A Class defining an interface that the result must implement.SQLException
- If no object found that implements the interfaceboolean isWrapperFor(Class<?> iface) throws SQLException
isWrapperFor
on 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 to unwrap
so that callers can use this method to avoid expensive unwrap
calls that may fail. If this method returns true then calling unwrap
with the same argument should succeed.iface
- a Class defining an interface.SQLException
- if an error occurs while determining whether this is a wrapper for an object with the given interface.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.sql/java/sql/Wrapper.html