@Override     public void execute(final String sql) throws DataAccessException {         if (logger.isDebugEnabled()) {             logger.debug("Executing SQL statement [" + sql + "]");         }         class ExecuteStatementCallback implements StatementCallback<Object>, SqlProvider {             @Override             public Object doInStatement(Statement stmt) throws SQLException {                 stmt.execute(sql);                 return null;             }             @Override             public String getSql() {                 return sql;             }         }         execute(new ExecuteStatementCallback());     }

以上这段代码来自JdbcTemplate的代码，请问为什么要在execute方法内定义类ExecuteStatementCallback呢？这样做有什么好处？