T- the result type
@FunctionalInterface public interface StatementCallback<T>
executeUpdatecall or repeated
executeUpdatecalls with varying SQL.
Used internally by JdbcTemplate, but also useful for application code.
@Nullable T doInStatement(Statement stmt) throws SQLException, DataAccessException
JdbcTemplate.executewith an active JDBC Statement. Does not need to care about closing the Statement or the Connection, or about handling transactions: this will all be handled by Spring's JdbcTemplate.
NOTE: Any ResultSets opened should be closed in finally blocks
within the callback implementation. Spring will close the Statement
object after the callback returned, but this does not necessarily imply
that the ResultSet resources will be closed: the Statement objects might
get pooled by the connection pool, with
close calls only
returning the object to the pool but not physically closing the resources.
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.
stmt- active JDBC Statement
SQLException- if thrown by a JDBC method, to be auto-converted to a DataAccessException by an SQLExceptionTranslator
DataAccessException- in case of custom exceptions