ConnectionCallback (Spring Framework 4.3.30.RELEASE API)

```
public interface ConnectionCallback<T>
```
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.
从以下版本开始:
1.1.3
作者:
Juergen Hoeller
另请参阅:
JdbcTemplate.execute(ConnectionCallback), JdbcTemplate.query(java.lang.String, org.springframework.jdbc.core.ResultSetExtractor<T>), JdbcTemplate.update(java.lang.String)

- 方法概要
  所有方法实例方法抽象方法
  修饰符和类型方法说明
  T doInConnection(Connection con)
  Gets called by JdbcTemplate.execute with an active JDBC Connection.

- 方法详细资料
  - 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.
    参数:
    con - active JDBC Connection
    返回:
    a result object, or null if none
    抛出:
    SQLException - if thrown by a JDBC method, to be auto-converted to a DataAccessException by a SQLExceptionTranslator
    DataAccessException - in case of custom exceptions
    另请参阅:
    JdbcTemplate.queryForObject(String, Class), JdbcTemplate.queryForRowSet(String)