// 设置默认的回调
_pojo_queryEntity = new PojoQueryEntityCallback();
_pojo_fetchEntity = new PojoFetchEntityCallback();
_pojo_eachEntity = new PojoEachEntityCallback();
_pojo_fetchInt = new PojoFetchIntCallback();
_pojo_fetchObject = new PojoFetchObjectCallback();
_pojo_queryRecord = new PojoQueryRecordCallback();
_pojo_fetchRecord = new PojoFetchRecordCallback();
_pojo_eachRecord = new PojoEachRecordCallback();
// check for spring DataSourceTransactionManager