mybatis泛型Dao参考一
泛型DAO接口的设计博客分类：

?结构设计Java代码??
1. import?java.io.Serializable;??
2. import?java.util.List;??
3. ??
4. /**?
5. ?*?GenericDao?DAO层泛型接口，定义基本的DAO功能?
6. ?*?@author?wl?
7. ?*?@since?0.1?
8. ?*?@param?<T>????实体类?
9. ?*?@param?<PK>????主键类，必须实现Serializable接口?
10. ?*??
11. ?*?@see?com.thinkon.commons.dao.GenericIbatisDao?
12. ?*/??
13. public?abstract?interface?GenericDao<T,?PK?extends?Serializable>?{??
14. ????/**?
15. ?????*?插入一个实体（在数据库INSERT一条记录）?
16. ?????*?@param?entity?实体对象?
17. ?????*/??
18. ????public?abstract?void?insert(T?entity);??
19. ??????
20. ????/**?
21. ?????*?修改一个实体对象（UPDATE一条记录）?
22. ?????*?@param?entity?实体对象?
23. ?????*?@return?修改的对象个数，正常情况=1?
24. ?????*/??
25. ????public?abstract?int?update(T?entity);??
26. ??????
27. ????/**?
28. ?????*?修改符合条件的记录?
29. ?????*?<p>此方法特别适合于一次性把多条记录的某些字段值设置为新值（定值）的情况，比如修改符合条件的记录的状态字段</p>?
30. ?????*?<p>此方法的另一个用途是把一条记录的个别字段的值修改为新值（定值），此时要把条件设置为该记录的主键</p>?
31. ?????*?@param?param?用于产生SQL的参数值，包括WHERE条件、目标字段和新值等?
32. ?????*?@return?修改的记录个数，用于判断修改是否成功?
33. ?????*/??
34. ????public?abstract?int?update(DynamicSqlParameter?param);??
35. ??????
36. ????/**?
37. ?????*?按主键删除记录?
38. ?????*?@param?primaryKey?主键对象?
39. ?????*?@return?删除的对象个数，正常情况=1?
40. ?????*/??
41. ????public?abstract?int?delete(PK?primaryKey);??
42. ??
43. ????/**?
44. ?????*?删除符合条件的记录?
45. ?????*?<p><strong>此方法一定要慎用，如果条件设置不当，可能会删除有用的记录！</strong></p>?
46. ?????*?@param?param?用于产生SQL的参数值，包括WHERE条件（其他参数内容不起作用）?
47. ?????*?@return?
48. ?????*/??
49. ????public?abstract?int?delete(DynamicSqlParameter?param);??
50. ??????
51. ????/**?
52. ?????*?清空表，比delete具有更高的效率，而且是从数据库中物理删除（delete是逻辑删除，被删除的记录依然占有空间）?
53. ?????*?<p><strong>此方法一定要慎用！</strong></p>?
54. ?????*?@return?
55. ?????*/??
56. ????public?abstract?int?truncate();??
57. ??????
58. ????/**?
59. ?????*?查询整表总记录数?
60. ?????*?@return?整表总记录数?
61. ?????*/??
62. ????public?abstract?int?count();??
63. ??????
64. ????/**?
65. ?????*?查询符合条件的记录数?
66. ?????*?@param?param?查询条件参数，包括WHERE条件（其他参数内容不起作用）。此参数设置为null，则相当于count()?
67. ?????*?@return?
68. ?????*/??
69. ????public?abstract?int?count(DynamicSqlParameter?param);??
70. ??
71. ????/**?
72. ?????*?按主键取记录?
73. ?????*?@param?primaryKey?主键值?
74. ?????*?@return?记录实体对象，如果没有符合主键条件的记录，则返回null?
75. ?????*/??
76. ????public?abstract?T?get(PK?primaryKey);??
77. ??
78. ????/**?
79. ?????*?按主键取记录?
80. ?????*?@param?primaryKey?主键值?
81. ?????*?@return?记录实体对象，如果没有符合主键条件的记录，则?throw?DataAccessException?
82. ?????*/??
83. ????public?abstract?T?load(PK?primaryKey)?throws?DataAccessException;??
84. ??
85. ????/**?
86. ?????*?取全部记录?
87. ?????*?@return?全部记录实体对象的List?
88. ?????*/??
89. ????public?abstract?List<T>?select();??
90. ??????
91. ????/**?
92. ?????*?按条件查询记录?
93. ?????*?@param?param?查询条件参数，包括WHERE条件、分页条件、排序条件?
94. ?????*?@return?符合条件记录的实体对象的List?
95. ?????*/??
96. ????public?abstract?List<T>?select(DynamicSqlParameter?param);??
97. ??????
98. ????/**?
99. ?????*?按条件查询记录，并处理成分页结果?
100. ?????*?@param?param?查询条件参数，包括WHERE条件、分页条件、排序条件?
101. ?????*?@return?PaginationResult对象，包括（符合条件的）总记录数、页实体对象List等?
102. ?????*/??
103. ????public?abstract?PaginationResult<T>?selectPagination(DynamicSqlParameter?param);??
104. ??????
105. ????/**?
106. ?????*?按条件查询记录，并把有外键关联的字段的关联对象也处理出来?
107. ?????*?<p>此方法是为了避免1+N而设置的</p>?
108. ?????*?@param?param?查询条件参数，包括WHERE条件、分页条件、排序条件<strong>（不包括外键关联表条件）</strong>?
109. ?????*?@return?符合条件记录的实体对象的List?
110. ?????*/??
111. ????public?abstract?List<T>?selectFk(DynamicSqlParameter?param);??
112. ??????
113. ????/**?
114. ?????*?按条件查询记录，并把有外键关联的字段的关联对象也处理出来，并处理成分页结果?
115. ?????*?<p>此方法是为了避免1+N而设置的</p>?
116. ?????*?@param?param?查询条件参数，包括WHERE条件、分页条件、排序条件<strong>（不包括外键关联表条件）</strong>?
117. ?????*?@return?PaginationResult对象，包括（符合条件的）总记录数、页实体对象List等?
118. ?????*/??
119. ????public?abstract?PaginationResult<T>?selectFkPagination(DynamicSqlParameter?param);??
120. ??????
121. ????/**?
122. ?????*?批量插入?
123. ?????*?@param?list?
124. ?????*/??
125. ????public?abstract?void?batchInsert(final?List<T>?list);??
126. ??????
127. ????/**?
128. ?????*?批量修改?
129. ?????*?@param?list?
130. ?????*/??
131. ????public?abstract?void?batchUpdate(final?List<T>?list);??
132. ??????
133. ????/**?
134. ?????*?批量删除?
135. ?????*?@param?list?
136. ?????*/??
137. ????public?abstract?void?batchDelete(final?List<PK>?list);??
138. }??

?2、泛型接口的实现类（其他DAO的基类），以iBatis实现：

Java代码??
1. import?java.io.Serializable;??
2. import?java.sql.SQLException;??
3. import?java.util.List;??
4. ??
5. import?org.springframework.orm.ibatis.SqlMapClientCallback;??
6. import?org.springframework.orm.ibatis.support.SqlMapClientDaoSupport;??
7. ??
8. import?com.ibatis.sqlmap.client.SqlMapExecutor;??
9. ??
10. /**?
11. ?*?iBatis?DAO层泛型基类，实现了基本的DAO功能?利用了Spring的DaoSupport功能?
12. ?*??
13. ?*?@author?wl?
14. ?*?@since?0.1?
15. ?*?@param?<T>?
16. ?*????????????实体类?
17. ?*?@param?<PK>?
18. ?*????????????主键类，必须实现Serializable接口?
19. ?*??
20. ?*?@see?com.thinkon.commons.dao.GenericDao?
21. ?*?@see?org.springframework.orm.ibatis.support.SqlMapClientDaoSupport?
22. ?*/??
23. public?abstract?class?GenericIbatisDao<T,?PK?extends?Serializable>?extends??
24. ????????SqlMapClientDaoSupport?implements?GenericDao<T,?PK>?{??
25. ??
26. ????//?sqlmap.xml定义文件中对应的sqlid??
27. ????public?static?final?String?SQLID_INSERT?=?"insert";??
28. ????public?static?final?String?SQLID_UPDATE?=?"update";??
29. ????public?static?final?String?SQLID_UPDATE_PARAM?=?"updateParam";??
30. ????public?static?final?String?SQLID_DELETE?=?"delete";??
31. ????public?static?final?String?SQLID_DELETE_PARAM?=?"deleteParam";??
32. ????public?static?final?String?SQLID_TRUNCATE?=?"truncate";??
33. ????public?static?final?String?SQLID_SELECT?=?"select";??
34. ????public?static?final?String?SQLID_SELECT_PK?=?"selectPk";??
35. ????public?static?final?String?SQLID_SELECT_PARAM?=?"selectParam";??
36. ????public?static?final?String?SQLID_SELECT_FK?=?"selectFk";??
37. ????public?static?final?String?SQLID_COUNT?=?"count";??
38. ????public?static?final?String?SQLID_COUNT_PARAM?=?"countParam";??
39. ??
40. ????private?String?sqlmapNamespace?=?"";??
41. ??
42. ????/**?
43. ?????*?sqlmapNamespace，对应sqlmap.xml中的命名空间?
44. ?????*??
45. ?????*?@return?
46. ?????*/??
47. ????public?String?getSqlmapNamespace()?{??
48. ????????return?sqlmapNamespace;??
49. ????}??
50. ??
51. ????/**?
52. ?????*?sqlmapNamespace的设置方法，可以用于spring注入?
53. ?????*??
54. ?????*?@param?sqlmapNamespace?
55. ?????*/??
56. ????public?void?setSqlmapNamespace(String?sqlmapNamespace)?{??
57. ????????this.sqlmapNamespace?=?sqlmapNamespace;??
58. ????}??
59. ??
60. ????/**?
61. ?????*?数据库方言，缺省为MYSQL?
62. ?????*/??
63. ????private?String?dbDialect?=?"MYSQL";??
64. ??
65. ????/**?
66. ?????*?数据库方言dbDialect的get方法?
67. ?????*??
68. ?????*?@return?
69. ?????*/??
70. ????public?String?getDbDialect()?{??
71. ????????return?dbDialect;??
72. ????}??
73. ??
74. ????/**?
75. ?????*?数据库方言dbDialect的set方法?
76. ?????*??
77. ?????*?@return?
78. ?????*/??
79. ????public?void?setDbDialect(String?dbDialect)?{??
80. ????????if?(dbDialect?==?null??
81. ????????????????||?(!dbDialect.equals("MYSQL")?&&?!dbDialect.equals("ORACLE")))??
82. ????????????throw?new?DaoException("错误的数据库方言设置：本系统只支持MYSQL和ORACLE");??
83. ????????this.dbDialect?=?dbDialect;??
84. ????}??
85. ??
86. ????public?int?count()?{??
87. ????????Integer?count?=?(Integer)?getSqlMapClientTemplate().queryForObject(??
88. ????????????????sqlmapNamespace?+?"."?+?SQLID_COUNT);??
89. ????????return?count.intValue();??
90. ????}??
91. ??
92. ????public?int?count(DynamicSqlParameter?param)?{??
93. ????????Integer?count?=?(Integer)?getSqlMapClientTemplate().queryForObject(??
94. ????????????????sqlmapNamespace?+?"."?+?SQLID_COUNT_PARAM,?param);??
95. ????????return?count.intValue();??
96. ????}??
97. ??
98. ????public?int?delete(PK?primaryKey)?{??
99. ????????int?rows?=?getSqlMapClientTemplate().delete(??
100. ????????????????sqlmapNamespace?+?"."?+?SQLID_DELETE,?primaryKey);??
101. ????????try?{??
102. ????????????getSqlMapClientTemplate().getSqlMapClient().startBatch();??
103. ????????}?catch?(SQLException?e)?{??
104. ????????????//?TODO?Auto-generated?catch?block??
105. ????????????e.printStackTrace();??
106. ????????}??
107. ????????return?rows;??
108. ????}??
109. ??
110. ????public?int?delete(DynamicSqlParameter?param)?{??
111. ????????int?rows?=?getSqlMapClientTemplate().delete(??
112. ????????????????sqlmapNamespace?+?"."?+?SQLID_DELETE_PARAM,?param);??
113. ????????return?rows;??
114. ????}??
115. ??
116. ????public?int?truncate()?{??
117. ????????int?rows?=?getSqlMapClientTemplate().delete(??
118. ????????????????sqlmapNamespace?+?"."?+?SQLID_TRUNCATE);??
119. ????????return?rows;??
120. ????}??
121. ??
122. ????public?T?get(PK?primaryKey)?{??
123. ????????return?(T)?getSqlMapClientTemplate().queryForObject(??
124. ????????????????sqlmapNamespace?+?"."?+?SQLID_SELECT_PK,?primaryKey);??
125. ????}??
126. ??
127. ????public?void?insert(T?entity)?{??
128. ????????getSqlMapClientTemplate().insert(sqlmapNamespace?+?"."?+?SQLID_INSERT,??
129. ????????????????entity);??
130. ????}??
131. ??
132. ????public?T?load(PK?primaryKey)?throws?DaoException?{??
133. ????????Object?o?=?getSqlMapClientTemplate().queryForObject(??
134. ????????????????sqlmapNamespace?+?"."?+?SQLID_SELECT_PK,?primaryKey);??
135. ????????if?(o?==?null)??
136. ????????????throw?new?DataAccessException("数据查询异常：无法查询出主键数据");??
137. ????????return?(T)?o;??
138. ????}??
139. ??
140. ????public?List<T>?select()?{??
141. ????????return?getSqlMapClientTemplate().queryForList(??
142. ????????????????sqlmapNamespace?+?"."?+?SQLID_SELECT);??
143. ????}??
144. ??
145. ????public?List<T>?select(DynamicSqlParameter?param)?{??
146. ????????return?getSqlMapClientTemplate().queryForList(??
147. ????????????????sqlmapNamespace?+?"."?+?SQLID_SELECT_PARAM,?param);??
148. ????}??
149. ??
150. ????public?PaginationResult<T>?selectPagination(DynamicSqlParameter?param)?{??
151. ????????if?(param?!=?null)??
152. ????????????param.setDbDialect(this.dbDialect);??
153. ??
154. ????????PaginationResult<T>?result?=?new?PaginationResult<T>();??
155. ????????int?count?=?count(param);??
156. ????????result.setTotalSize(count);??
157. ????????if?(count?>?0)?{??
158. ????????????List<T>?data?=?getSqlMapClientTemplate().queryForList(??
159. ????????????????????sqlmapNamespace?+?"."?+?SQLID_SELECT_PARAM,?param);??
160. ????????????result.setData(data);??
161. ????????}??
162. ??
163. ????????return?result;??
164. ????}??
165. ??
166. ????public?List<T>?selectFk(DynamicSqlParameter?param)?{??
167. ????????return?getSqlMapClientTemplate().queryForList(??
168. ????????????????sqlmapNamespace?+?"."?+?SQLID_SELECT_FK,?param);??
169. ????}??
170. ??
171. ????public?PaginationResult<T>?selectFkPagination(DynamicSqlParameter?param)?{??
172. ????????if?(param?!=?null)??
173. ????????????param.setDbDialect(this.dbDialect);??
174. ????????PaginationResult<T>?result?=?new?PaginationResult<T>();??
175. ????????int?count?=?count(param);??
176. ????????result.setTotalSize(count);??
177. ????????if?(count?>?0)?{??
178. ????????????List<T>?data?=?getSqlMapClientTemplate().queryForList(??
179. ????????????????????sqlmapNamespace?+?"."?+?SQLID_SELECT_FK,?param);??
180. ????????????result.setData(data);??
181. ????????}??
182. ??
183. ????????return?result;??
184. ????}??
185. ??
186. ????public?int?update(T?entity)?{??
187. ????????return?getSqlMapClientTemplate().update(??
188. ????????????????sqlmapNamespace?+?"."?+?SQLID_UPDATE,?entity);??
189. ????}??
190. ??
191. ????public?int?update(DynamicSqlParameter?param)?{??
192. ????????if?(param?==?null?||?param.getUpdateValueList()?==?null)??
193. ????????????throw?new?ParameterException(??
194. ????????????????????"参数设置错误:使用带参数的update必须设定update的column！");??
195. ??
196. ????????return?getSqlMapClientTemplate().update(??
197. ????????????????sqlmapNamespace?+?"."?+?SQLID_UPDATE_PARAM,?param);??
198. ????}??
199. ??
200. ????public?void?batchInsert(final?List<T>?list){??
201. ????????SqlMapClientCallback?callback?=?new?SqlMapClientCallback()?{??????????
202. ????????????public?Object?doInSqlMapClient(SqlMapExecutor?executor)?throws?SQLException?{??????????????
203. ????????????????executor.startBatch();??????????????
204. ????????????????for?(T?member?:?list)?{??????????????????
205. ????????????????????executor.insert(sqlmapNamespace?+?"."?+?SQLID_INSERT,?member);??????????????
206. ????????????????}??????????????
207. ????????????????executor.executeBatch();??????????????
208. ????????????????return?null;??????????
209. ????????????}??????
210. ????????};??????
211. ????????this.getSqlMapClientTemplate().execute(callback);??????
212. ????}??
213. ??
214. ????public?void?batchUpdate(final?List<T>?list){??
215. ????????SqlMapClientCallback?callback?=?new?SqlMapClientCallback()?{??????????
216. ????????????public?Object?doInSqlMapClient(SqlMapExecutor?executor)?throws?SQLException?{??????????????
217. ????????????????executor.startBatch();??????????????
218. ????????????????for?(T?member?:?list)?{??????????????????
219. ????????????????????executor.update(sqlmapNamespace?+?"."?+?SQLID_UPDATE,?member);??????????????
220. ????????????????}??????????????
221. ????????????????executor.executeBatch();??????????????
222. ????????????????return?null;??????????
223. ????????????}??????
224. ????????};??????
225. ????????this.getSqlMapClientTemplate().execute(callback);??????
226. ????}??
227. ??
228. ????public?void?batchDelete(final?List<PK>?list){??
229. ????????SqlMapClientCallback?callback?=?new?SqlMapClientCallback()?{??????????
230. ????????????public?Object?doInSqlMapClient(SqlMapExecutor?executor)?throws?SQLException?{??????????????
231. ????????????????executor.startBatch();??????????????
232. ????????????????for?(PK?member?:?list)?{??????????????????
233. ????????????????????executor.delete(sqlmapNamespace?+?"."?+?SQLID_DELETE,?member);??????????????
234. ????????????????}??????????????
235. ????????????????executor.executeBatch();??????????????
236. ????????????????return?null;??????????
237. ????????????}??????
238. ????????};??????
239. ????????this.getSqlMapClientTemplate().execute(callback);??????
240. ????}??
241. }??

?3、某实体的DAO接口：

Java代码??
1. public?interface?UserDao?extends?GenericDao<User,Integer>?{??
2. //通用方法从GenericDao继承??
3. //这里可以定义针对此类的特定方法??
4. }??

?4、某实体的DAO实现：

Java代码??
1. public?class?UserDaoImpl?extends?GenericIbatisDao<User,Integer>?implements?UserDao?{??
2. }??

?