Interface ConnectionCallback<T extends @Nullable Object>

Type Parameters:

T - the result type

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface ConnectionCallback<T extends @Nullable Object>

Generic callback interface for code that operates on a JDBC Connection. Allows to execute any number of operations on a single Connection, using any type and number of Statements.

This is particularly useful for delegating to existing data access code that expects a Connection to work on and throws SQLException. For newly written code, it is strongly recommended to use JdbcTemplate's more specific operations, for example a query or update variant.

Since:

1.1.3

Author:

Juergen Hoeller

See Also:

• JdbcTemplate.execute(ConnectionCallback)
• JdbcTemplate.query(String, ResultSetExtractor)
• JdbcTemplate.update(String)

Method Summary

Modifier and Type	Method	Description
T	doInConnection(Connection con)	Gets called by JdbcTemplate.execute with an active JDBC Connection.

Method Details

doInConnection

T doInConnection(Connection con)
          throws SQLException,
DataAccessException

Gets called by JdbcTemplate.execute with an active JDBC Connection. Does not need to care about activating or closing the Connection, or handling transactions.

If called without a thread-bound JDBC transaction (initiated by DataSourceTransactionManager), the code will simply get executed on the JDBC connection with its transactional semantics. If JdbcTemplate is configured to use a JTA-aware DataSource, the JDBC Connection and thus the callback code will be transactional if a JTA transaction is active.

Allows for returning a result object created within the callback, i.e. a domain object or a collection of domain objects. Note that there's special support for single step actions: see JdbcTemplate.queryForObject etc. A thrown RuntimeException is treated as application exception: it gets propagated to the caller of the template.

Parameters:

con - active JDBC Connection

Returns:

a result object, or null if none

Throws:

SQLException - if thrown by a JDBC method, to be auto-converted to a DataAccessException by an SQLExceptionTranslator

DataAccessException - in case of custom exceptions

See Also:

• JdbcTemplate.queryForObject(String, Class)
• JdbcTemplate.queryForRowSet(String)