1. import java.io.Serializable;
2. import java.util.List;
4. import org.hibernate.criterion.DetachedCriteria;
6. public interface BaseDao<T> {
7. //增
8. void save(T t);
9. //删
10. void delete(T t);
11. //删
12. void delete(Serializable id);
13. //改
14. void update(T t);
15. //查 根据id查询
16. T getById(Serializable id);
17. //查 符合条件的总记录数
18. Integer getTotalCount(DetachedCriteria dc);
19. //查 查询分页列表数据
20. List<T> getPageList(DetachedCriteria dc,Integer start,Integer pageSize);
22. }

1. import java.io.Serializable;
2. import java.lang.reflect.ParameterizedType;
3. import java.lang.reflect.Type;
4. import java.util.List;
6. import org.hibernate.criterion.DetachedCriteria;
7. import org.hibernate.criterion.Projections;
8. import org.springframework.orm.hibernate5.support.HibernateDaoSupport;
10. import cn.itcast.dao.BaseDao;
11. import cn.itcast.domain.Customer;
13. public class BaseDaoImpl<T> extends HibernateDaoSupport implements BaseDao<T> {
15. private Class clazz;//用于接收运行期泛型类型
18. public BaseDaoImpl() {
19. //获得当前类型的带有泛型类型的父类
20. ParameterizedType ptClass = (ParameterizedType) this.getClass().getGenericSuperclass();
21. //获得运行期的泛型类型
22. clazz = (Class) ptClass.getActualTypeArguments()[0];
23. }
25. @Override
26. public void save(T t) {
27. getHibernateTemplate().save(t);
28. }
30. @Override
31. public void delete(T t) {
33. getHibernateTemplate().delete(t);
35. }
37. @Override
38. public void delete(Serializable id) {
39. T t = this.getById(id);//先取,再删
40. getHibernateTemplate().delete(t);
41. }
43. @Override
44. public void update(T t) {
45. getHibernateTemplate().update(t);
46. }
48. @Override
49. public T getById(Serializable id) {
53. return (T) getHibernateTemplate().get(clazz, id);
54. }
56. @Override
57. public Integer getTotalCount(DetachedCriteria dc) {
58. //设置查询的聚合函数,总记录数
59. dc.setProjection(Projections.rowCount());
61. List<Long> list = (List<Long>) getHibernateTemplate().findByCriteria(dc);
63. //清空之前设置的聚合函数
64. dc.setProjection(null);
66. if(list!=null && list.size()>0){
67. Long count = list.get(0);
68. return count.intValue();
69. }else{
70. return null;
71. }
73. }
75. @Override
76. public List<T> getPageList(DetachedCriteria dc, Integer start, Integer pageSize) {
78. List<T> list = (List<T>) getHibernateTemplate().findByCriteria(dc, start, pageSize);
80. return list;
81. }
83. }

1. import java.util.List;
3. import org.hibernate.criterion.DetachedCriteria;
5. import cn.itcast.domain.Customer;
7. public interface CustomerDao extends BaseDao<Customer> {
10. }

1. import java.util.List;
3. import org.hibernate.criterion.DetachedCriteria;
4. import org.hibernate.criterion.Projections;
5. import org.springframework.orm.hibernate5.support.HibernateDaoSupport;
7. import cn.itcast.dao.CustomerDao;
8. import cn.itcast.domain.Customer;
10. public class CustomerDaoImpl extends BaseDaoImpl<Customer> implements CustomerDao {
12. }

源码