Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 1EMud,,:
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 N(l
der\"?_.
据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 `F$lO2 #k
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 Aw]kQ\P&
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。 mb>8=hMg
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分页支持类: O+?vQ$z
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java代码: F!<!)_8Q
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package com.javaeye.common.util; ||))gI`3a
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import java.util.List; K: |-s4=
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publicclass PaginationSupport { d"tR?j
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publicfinalstaticint PAGESIZE = 30; A">R-1R
@1A.$:
privateint pageSize = PAGESIZE; vSy[lB|)24
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privateList items; R;zf x/
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privateint totalCount; 3lTnfc&
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privateint[] indexes = newint[0]; KE6XNG3
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privateint startIndex = 0; 6 rWb2b
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public PaginationSupport(List items, int (((|vI3 <
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totalCount){ P;eXUF+jn
setPageSize(PAGESIZE); ?G<ISiABQC
setTotalCount(totalCount); 1ASoH,D/
setItems(items); dQz#&&s-
setStartIndex(0); +sV~#%%
} 1aZGt2;
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public PaginationSupport(List items, int G^';9 UK
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totalCount, int startIndex){ ia (&$a8X
setPageSize(PAGESIZE); cwOa"]t}
setTotalCount(totalCount); /|lAxAm?
setItems(items); Ylyk/
setStartIndex(startIndex); ^ FM
} :G#+5 }
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public PaginationSupport(List items, int e,r7UtjoxR
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totalCount, int pageSize, int startIndex){ {5fL!`6w
setPageSize(pageSize); gm%cAme
setTotalCount(totalCount); vvu $8n
setItems(items); -:kIIK
setStartIndex(startIndex); /::Y &&$f
} >_\[C?8
.
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publicList getItems(){ 5fMlOP_
return items; ];jp)P2o
} pTB7k3g
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publicvoid setItems(List items){ K- $,:28
this.items = items; >t<\zC|~w
} T"aE]4_
y=.bn!u}z
publicint getPageSize(){ }dHdy{$
return pageSize; ;4(}e{
} =LODX29
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publicvoid setPageSize(int pageSize){ ~@)s)K
this.pageSize = pageSize; qGX#(,E9;
} J3(E{w8Q
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publicint getTotalCount(){ #0hqfs
return totalCount; (Q @'fb9z
} [3I|MZ
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publicvoid setTotalCount(int totalCount){ 3kk^hvB+f
if(totalCount > 0){ hF$qH^-c*A
this.totalCount = totalCount; (Li0*wRb
int count = totalCount / t=xEUOQAn
p:K%-^
pageSize; cs?WE9N
if(totalCount % pageSize > 0) <9piKtb|L
count++; .c~z^6x
indexes = newint[count]; pf107S
for(int i = 0; i < count; i++){ AS@(]T#R
indexes = pageSize * RRB=JP{r
)XGz#C_P
i; Je6wio-4
} =4co$oD}
}else{ ,a,2I
this.totalCount = 0; mJ=V<_
} hc+B+-,
} R ZQH#+*t}
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publicint[] getIndexes(){ e,VF;Br
return indexes; <n 06(9BF
} 4xr^4\lk
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publicvoid setIndexes(int[] indexes){ [A/2
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this.indexes = indexes; Q}OloA(+
} %),u0:go
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publicint getStartIndex(){ MTZCI}
return startIndex; [}j a\!P
} `D
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publicvoid setStartIndex(int startIndex){ T|wz%P<J
if(totalCount <= 0) jhQoBC>:
this.startIndex = 0; MiIxj%,(
elseif(startIndex >= totalCount) "q+Z*
this.startIndex = indexes l^nvwm`f#:
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[indexes.length - 1]; +cqUp6x.
elseif(startIndex < 0) JJ
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this.startIndex = 0; 3PZ(Kn<
else{ t#|R"Q#
this.startIndex = indexes \
*[Ht!y
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[startIndex / pageSize]; ; Z7!BU
} qe{;EH*
} 9QXsbd6
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publicint getNextIndex(){ GHd1?$
int nextIndex = getStartIndex() + eG!ma` v
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pageSize; 7;AK=;
if(nextIndex >= totalCount) &d2L9kTk
return getStartIndex(); 1L4-;HYJm
else `x/i1^/_@
return nextIndex; SA}Dkt&,
} SDO:Gma
/qy6YF8;y
publicint getPreviousIndex(){ TS9<uRO0
int previousIndex = getStartIndex() - FsJk"$}
L<@*6QH
pageSize; y!P!Fif'
if(previousIndex < 0) h>D;QY
return0; GkI'.
else n({%|O<|
return previousIndex; 5["3[h
} B._YT
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} g]: [^p
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抽象业务类 S._2..%G
java代码: b`D]L/}pr
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/** NT5=%X]
* Created on 2005-7-12 ,H+Y1N4W(
*/ mP
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package com.javaeye.common.business; uM1$3<
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import java.io.Serializable; V /2NIh
import java.util.List; ;X<Ez5v3
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import org.hibernate.Criteria; }p*|8$#x"
import org.hibernate.HibernateException; AH&RabH2
import org.hibernate.Session; }Mt)57rU
import org.hibernate.criterion.DetachedCriteria; qH4|k2Lm
import org.hibernate.criterion.Projections; pZ|{p{_j
import mTtaqo_Bh
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org.springframework.orm.hibernate3.HibernateCallback; v[ML=pL
import 2_HIn
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org.springframework.orm.hibernate3.support.HibernateDaoS o!+%|V8Y
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upport; u>9` ?O44
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import com.javaeye.common.util.PaginationSupport; GB Yy^wjU
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public abstract class AbstractManager extends :5CyR3P
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HibernateDaoSupport { ?H PAX
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privateboolean cacheQueries = false; ?}8r h%
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privateString queryCacheRegion; $k0(iFzR1
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publicvoid setCacheQueries(boolean >Vt2@Ee
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cacheQueries){ vwu/33
this.cacheQueries = cacheQueries; Sk7R;A
} 8&8!(\xv
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publicvoid setQueryCacheRegion(String K0(
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queryCacheRegion){ O>pX(DS
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this.queryCacheRegion = %k4Qx5`?d
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queryCacheRegion; W{'hn&vU
} ^,I2@OS
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publicvoid save(finalObject entity){ &,G2<2_ b
getHibernateTemplate().save(entity); EQlb:;j
} %dPk,Ylz
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publicvoid persist(finalObject entity){ 5n2!Y\
getHibernateTemplate().save(entity); %]I#]jR
} lfDd%.:q4S
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publicvoid update(finalObject entity){ <$-^^b(y
getHibernateTemplate().update(entity); 8%B_nVc
} I ==)a6^
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publicvoid delete(finalObject entity){ 2fr%_GNu
getHibernateTemplate().delete(entity); J@/4CSCR]
} B1|nT?}J(
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publicObject load(finalClass entity, 2o<*rH
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finalSerializable id){ :6M0`V;L
return getHibernateTemplate().load @i)tQd!s
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(entity, id); $z,bA*j9
} [ X~X?By>
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publicObject get(finalClass entity, -=sxbs.aA
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finalSerializable id){ v S+~4Q41
return getHibernateTemplate().get 9H)uTyuNi
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(entity, id); z
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} *nC,=2
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publicList findAll(finalClass entity){ q,(&2./
return getHibernateTemplate().find("from QNtr =
)
k2NF="o
" + entity.getName()); JWn{nJ$]
} +8Px` v1L
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# `nq
publicList findByNamedQuery(finalString f:Ja
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namedQuery){ ?7p|
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return getHibernateTemplate gdZVc9_
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().findByNamedQuery(namedQuery); 1c4%g-]7
} #~f+F0#%?
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publicList findByNamedQuery(finalString query, !?>)[@2
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9]w0zUOL6
finalObject parameter){ hpyre B
return getHibernateTemplate c\'pA^m6
6K y;1$
().findByNamedQuery(query, parameter); *u>\&`h=
} k$ M4NF~$
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publicList findByNamedQuery(finalString query, I7_D $a=
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finalObject[] parameters){ S3w?Zk3hO
return getHibernateTemplate JT9<kB/07
zLqp@\sT
().findByNamedQuery(query, parameters); >z
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} y
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XOwMT,=Z)
publicList find(finalString query){ T6r~OV5
return getHibernateTemplate().find bx^EaXj(r
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(query); W>bW1h
} gc~h!%'.I
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publicList find(finalString query, finalObject -c?wEqa~2
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parameter){ wIj2 IAD
return getHibernateTemplate().find hNo>)$v!s
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(query, parameter); 'uzv\[
} Kc\'s65.]
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public PaginationSupport findPageByCriteria TkoXzG8yE<
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(final DetachedCriteria detachedCriteria){ 26VdRy{[
return findPageByCriteria Z^6(&Rh
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); MEnHC'nI
} ] *VF Ws
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public PaginationSupport findPageByCriteria z
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(final DetachedCriteria detachedCriteria, finalint %,cFX[D/)
]q7 LoH'S
startIndex){ aZ>\*1
return findPageByCriteria ]U1,NhZu
u=}bq{
(detachedCriteria, PaginationSupport.PAGESIZE, *>p(]_s,
9PqgBq
startIndex); _xgVuJ
} tZCe?n]
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public PaginationSupport findPageByCriteria H!.D2J
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(final DetachedCriteria detachedCriteria, finalint ![]I%'s
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pageSize, G0
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finalint startIndex){ c_bVF 'Bz
return(PaginationSupport) )USC
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getHibernateTemplate().execute(new HibernateCallback(){ _+04M)q0
publicObject doInHibernate &:CjUaP@
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(Session session)throws HibernateException { Ji:iKkI
Criteria criteria = _RL-6jw#o
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detachedCriteria.getExecutableCriteria(session); 4G8nebv
int totalCount = )uid!d
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((Integer) criteria.setProjection(Projections.rowCount OW^2S_H5
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()).uniqueResult()).intValue(); {rvbo1t
criteria.setProjection ZutB_uW
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#
(null); 2>}\XKF).
List items = ^~6] 0$yJ
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criteria.setFirstResult(startIndex).setMaxResults {y:#'n
ljJz#+H2_
(pageSize).list();
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PaginationSupport ps = *Cnq2=A]A
N8XC~Dh{
new PaginationSupport(items, totalCount, pageSize, crNjI`%tw
.^LL9{?
startIndex); &oeN#5Es8C
return ps; W~u
} Itr7lv'5xx
}, true); i2:+h}o$e
} kWs+2j
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public List findAllByCriteria(final MxgLztY
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DetachedCriteria detachedCriteria){ d=?Mj]
return(List) getHibernateTemplate J`r,_)J"2
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().execute(new HibernateCallback(){ ^S#\O>GHP
publicObject doInHibernate 6)wy^a|pb
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(Session session)throws HibernateException { B [+(r
Criteria criteria = GOf`Z'\xt
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detachedCriteria.getExecutableCriteria(session); U=kx`j>
return criteria.list(); l`b1%0y
} JY2/YDJ
}, true); V#NG+U.B
} I7fb}j`/
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public int getCountByCriteria(final hj&fQ}X
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DetachedCriteria detachedCriteria){ x6^l6 N
Integer count = (Integer) <&5m N
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getHibernateTemplate().execute(new HibernateCallback(){ &|.hkR2k
publicObject doInHibernate BTTLy^
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(Session session)throws HibernateException { }bf=Ntk
Criteria criteria = ]*N:;J
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detachedCriteria.getExecutableCriteria(session); VEj$^bpp5s
return y=AsgJ
/gz:zThf{
criteria.setProjection(Projections.rowCount bauA}3
L[?nST18%
()).uniqueResult(); S!;LF4VA
} {O^TurbTFA
}, true); %K[daXw6E8
return count.intValue(); x\hWyY6J[
} LY]nl3{E
} 'K@-Z]
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用户在web层构造查询条件detachedCriteria,和可选的 8|O=/m ^]
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 CI`N8
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PaginationSupport的实例ps。 xS'zZ%?
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ps.getItems()得到已分页好的结果集 A\K,_&x1Z
ps.getIndexes()得到分页索引的数组 t|}O.u-&;~
ps.getTotalCount()得到总结果数 E&*:
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ps.getStartIndex()当前分页索引 0n3D~Xzd
ps.getNextIndex()下一页索引 [,=d7*b(l
ps.getPreviousIndex()上一页索引 | h}B{D
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 $I@GUtzjp
8pXKO"u],
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 38~PWKt
e+'%!w"B
一下代码重构了。 !VwmPAMr#v
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我把原本我的做法也提供出来供大家讨论吧: G"T\=cQz
B5ea(j
首先,为了实现分页查询,我封装了一个Page类: o#>a 5
java代码: fkjeR
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X\Y}oa."A
/*Created on 2005-4-14*/ y,E.SB
package org.flyware.util.page; PWH^=K
{ p;shs5
/** $ rUSKm#
* @author Joa BcQEG *N
* VWx]1\
*/ `'i( U7?
publicclass Page { |7"$ w%2
,:)`+v<
/** imply if the page has previous page */ :^i^0dC
privateboolean hasPrePage; xCXQ<77
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/** imply if the page has next page */ {u"8[@@./
privateboolean hasNextPage; _V2xA88
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/** the number of every page */ edipA
P~!
privateint everyPage; [Wi1|]X"G
"l7NWqfB
/** the total page number */ e(?]SU|
privateint totalPage; rf.`h{!!
dtZE67KS
/** the number of current page */ 5'KA'>@
privateint currentPage; ~g6 3qs
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/** the begin index of the records by the current *bd[S0l
OhVs#^
query */ nhT-Ido
privateint beginIndex; c9wfsapJ
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/** The default constructor */ 7fHc[,
public Page(){ q{0R=jb
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} [ sF(#Y:I
bQ'8SCe
/** construct the page by everyPage &V7M}@
* @param everyPage I%j_"r9-I
* */ x/!5K|c
public Page(int everyPage){ *=AqM14 @
this.everyPage = everyPage; \$sjrqKnu
} X]%itA
#]P9b@@e
/** The whole constructor */ (wRgus
public Page(boolean hasPrePage, boolean hasNextPage, c(#;_Ve2P
Fqy\CMC
>J9oH=S6
int everyPage, int totalPage, iOAbaPN
int currentPage, int beginIndex){ "]K>j'^Zs<
this.hasPrePage = hasPrePage; ":a\z(*t
this.hasNextPage = hasNextPage; $+p?Y)h .
this.everyPage = everyPage; V!v:]E
this.totalPage = totalPage; Lk\P7w{
this.currentPage = currentPage; 7%f&M>/
this.beginIndex = beginIndex; Xpe)PXb
} 7lV.[&aKW
'k;rH!R
/** -Eu6U`"(
* @return 'R-3fO???
* Returns the beginIndex. y!tC20Q
*/
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publicint getBeginIndex(){ 0}!\$"|D
return beginIndex; '3zc|eJt&
} c\a_VRN>r
q9Y9w(
/** }PTV] q%
* @param beginIndex jCbV,0)^
* The beginIndex to set. RuII!}*
*/ n]E?3UGD@W
publicvoid setBeginIndex(int beginIndex){ Zm6{n'
this.beginIndex = beginIndex; _ODbY;M
} y=?)n\f
'>r7V
/** ns6(cJ^a
* @return |{CfWSB7~@
* Returns the currentPage. Z&;uh_EC
*/ ^0/j0]O
publicint getCurrentPage(){ g+J-Zg6
return currentPage; BNL;Biyt7
} +v=C@2T
dqN5]Sb2B
/** xlQBe-Wg
* @param currentPage hCC<?5q
* The currentPage to set. @Y1s$,=xB
*/ =Xo
=Qcr
publicvoid setCurrentPage(int currentPage){ 6Vz9?puD
this.currentPage = currentPage; 4^M
} ZIQ
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w@{= nD4p
/** !QvZ<5(
* @return <yd{tD$A*
* Returns the everyPage. gP;&e:/3
*/ K*~0"F>"0
publicint getEveryPage(){ YJ\Xj56gv
return everyPage; \--8lH -K
} 'IwNTM
s,]z[qB#$
/** XT4{Pe7{[P
* @param everyPage T\D}kQM
* The everyPage to set. 7eAX*Kgt<_
*/ -4
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publicvoid setEveryPage(int everyPage){ !6*"(
this.everyPage = everyPage; / G7vwC
} ^zQ/mo,Z
:51/29}
/** 9po3m]|zy
* @return 0eDHu
* Returns the hasNextPage. f=WDR m]
*/ )8$=C#qC[
publicboolean getHasNextPage(){ gcl5jB5)>
return hasNextPage; $xPaYf
} E?
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7_inJ$
/** M 0U0;QJ
* @param hasNextPage 8~@c)Z;
* The hasNextPage to set. [J?aD`{#O
*/ !
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publicvoid setHasNextPage(boolean hasNextPage){ GkQpELO:
this.hasNextPage = hasNextPage; woGAf)vV#
} %D\[*
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/** ~d|A!S`
* @return f Sa"%8%
* Returns the hasPrePage. c7x~{V8
*/ f'EuY17w
publicboolean getHasPrePage(){ !Fd~~v
return hasPrePage; Y[}>CYO
} Ch<[l8;K
0=2@
/** \Je0CD=e`
* @param hasPrePage Whm,F^
* The hasPrePage to set. ~j}cyHg
*/ Z`ID+
publicvoid setHasPrePage(boolean hasPrePage){ su{poQ}K
this.hasPrePage = hasPrePage; 0"
} Q ayPo]O
S2sQOM@
/** jFL #s&ft
* @return Returns the totalPage. 5YE'L.
* 0zmE>/O+
*/ r!_-"~`7E
publicint getTotalPage(){ K*K,}W&}
return totalPage; g+vva"
} ls\WXCH
+hg3I8q:
/** @E7DyU|
* @param totalPage ! >(7+B3E*
* The totalPage to set. #Z?A2r!1
*/ xpV|\2C
publicvoid setTotalPage(int totalPage){ Cjm`|~&e+
this.totalPage = totalPage; gc_:%ki
} 89pEfl j2
yVU^M?`#
} kCWV r
y-'$(x
@vC4[:"pD}
h\fjBDU^
BO~0ON0
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 6Zm# bFQ
dk[!V1x4\
个PageUtil,负责对Page对象进行构造: cOmw?kA*G
java代码: 2b}t,&bv?
a!6{:8Zi0
6iVxc|Ia
/*Created on 2005-4-14*/ {Z(h.de
package org.flyware.util.page; n\Z!ff/
SA&Rep^
import org.apache.commons.logging.Log; :;t:H]
f
import org.apache.commons.logging.LogFactory; hgYZOwQ
`uv2H$
/** U6glp@s
* @author Joa l+xX/A)
* "h{q#~s
*/ >c1qpk/
publicclass PageUtil { EU2$f
OcR$zlgs[v
privatestaticfinal Log logger = LogFactory.getLog o5Dk:Bw
=MQoC:l
(PageUtil.class); q(
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/** : %lTU
* Use the origin page to create a new page I&D5;8
* @param page hQ,ch[j'
* @param totalRecords =_.l8IYX$%
* @return kvL=>
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*/ j+i\bks
publicstatic Page createPage(Page page, int >!eAM )
;v}GJ<3
totalRecords){ Rvqq.I8aC
return createPage(page.getEveryPage(), 7x"R3
tqz3zIQ
page.getCurrentPage(), totalRecords); k :(SCHf
} v> LIvi|]
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/** pR*VdC _mY
* the basic page utils not including exception O*hDbM2QQw
u(z$fG:g
handler }n]Ng]KM`
* @param everyPage 66g9l9wm(
* @param currentPage !EvAB+`jLI
* @param totalRecords AHD=<7Rs
* @return page Tm~" IB*
*/ A!od9W6
publicstatic Page createPage(int everyPage, int \{Y 7FC~
cq,S P&T~
currentPage, int totalRecords){ =2`[&
everyPage = getEveryPage(everyPage); .<->C?#
currentPage = getCurrentPage(currentPage); R[zpD%CI
int beginIndex = getBeginIndex(everyPage, eE.5zXU3R
+^&v5[$R
currentPage); 3}#XA+Z
int totalPage = getTotalPage(everyPage, h@m n
GE
b-(UsY:
totalRecords); 3!oQmG_T
boolean hasNextPage = hasNextPage(currentPage,
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N7I71q|
totalPage); HT,kx
boolean hasPrePage = hasPrePage(currentPage); %d[xr h
,I&0#+}n
returnnew Page(hasPrePage, hasNextPage, [ls ?IFg
everyPage, totalPage, P7k$^n
currentPage, S_ -QvG2
c>i*HN}Z|
beginIndex); ~~:8Yv[(
} lKhh=Pc2
t-4R7`A<
privatestaticint getEveryPage(int everyPage){ \`p~b(
return everyPage == 0 ? 10 : everyPage; `w=H'"Zv
} `Ig2f$}
3
cW"VrFy9
privatestaticint getCurrentPage(int currentPage){ b;{"lJ:+Z
return currentPage == 0 ? 1 : currentPage; ;7n*PBUJJ
} O"^a.`27
nC!^,c
privatestaticint getBeginIndex(int everyPage, int +l?ro[#6&.
7@cvy?
v{
currentPage){ ;{q) |GRF
return(currentPage - 1) * everyPage; o`8+#+@f7
} +j: Ld(
hCvLwZ?LF
privatestaticint getTotalPage(int everyPage, int '-]BSU
L%O8vn^3
totalRecords){ vgW1hWmHJ
int totalPage = 0; p,u<gJUL
b
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if(totalRecords % everyPage == 0) ;ld~21#m
totalPage = totalRecords / everyPage; U6'haPlOk%
else - QI`npsnV
totalPage = totalRecords / everyPage + 1 ; Qp{-!*
Ww
tQ>'R"
return totalPage; 9egaN_K
} f uNXY-;
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privatestaticboolean hasPrePage(int currentPage){ 1LIV/l^}f
return currentPage == 1 ? false : true; Cl.T'A$
} =egi?Ne
JIKxY$GS
privatestaticboolean hasNextPage(int currentPage, BI^]juH-c
Ry S{@=si
int totalPage){ *=9#tYn~
return currentPage == totalPage || totalPage == / lM~K:
<m:wuNEM
0 ? false : true; :Sn3|`HDm
} OwIy(ukTI
"EhO )lR
b{>dOI*.}
} Hf{%N'4
4^ 6L ])y
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sLqvDH?V
TC{Qu;`H+U
上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 ^|;4/=bbs
Vot+gCZ
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 rK)
Iw7r}G
做法如下: /(pChY>
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 K.1yncS^
S)|b%mVwR
的信息,和一个结果集List: Fh$&puF2
java代码: X
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Qb{5*>
$-fY 8V3[
/*Created on 2005-6-13*/ r$Qh`[<
package com.adt.bo; 1W<_5 j_
/- 4B)mL
import java.util.List; QXj(Urp
p=gUcO8
import org.flyware.util.page.Page; :]QxT8B
`3oP^#
/** a\_,_psK
* @author Joa 7e[\0:Z
*/ gSYX @'Q!
publicclass Result { fGWK&nONyk
Yb{t!KL
private Page page; r/L]uSN
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private List content; }*R6p?L5
C
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/** toJ&$HrE
* The default constructor D +""o"%
*/ 7b2<,
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public Result(){ uwA3!5
super(); %([H*sLX
} mP[u[|]
E/']M~Q
/** CHI(\DXNs
* The constructor using fields ??V["o T
* TeqsP1{?
* @param page oH"N>@ Vl
* @param content ?='9YM
*/ q:.BY}X9
public Result(Page page, List content){ Ngnjr7Q={T
this.page = page; ),,vu
this.content = content; K_n%`5
} gwNkjI=,
!F)oX7"
/** -m/4\D
* @return Returns the content. p]4
sN
*/ pASVnXJZ
publicList getContent(){ BUyA]
return content; P7-3Vf_L
} g"Bv!9*H
j83
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/** sf0U(XYQ^
* @return Returns the page. y>8?RX8
*/ Z]BRMx
public Page getPage(){ mM.&c5U
return page; y{JkY\g
} &=bI3-
N{g=Pf?I}
/** $ cSZX#\
* @param content $ 1U%E
* The content to set. +E4_^
*/ K#r`^aUc
public void setContent(List content){ J?'!8,RX
this.content = content; 9OUhV[D
} 3yN1cd"#?
*en{pR'
/** mz1g8M`@[D
* @param page RMK
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* The page to set. #SueT"F
*/ soF ^G21N
publicvoid setPage(Page page){ ?9+;[X
this.page = page; 1zRO==b
} > R=YF*t
} iQF93:#
=%LS9e^7D
u2QJDLMJv
xh0!H|
R
zVu}7v()
2. 编写业务逻辑接口,并实现它(UserManager, 71_N9ub@z
/hQ!dU.+
UserManagerImpl) #Z : r
java代码: Cb.Aw!
:[doYizk:
i^#RiCeo
/*Created on 2005-7-15*/ iYnt:C
package com.adt.service; bPNsy@"6
M4| L
import net.sf.hibernate.HibernateException; bGZy0.
Go4l#6
import org.flyware.util.page.Page; -t]0DsPg
C}CX n X
import com.adt.bo.Result;
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/** $\H>dm
* @author Joa JmkJ^-A 6
*/ ZYG"nmNd
publicinterface UserManager { \gdd
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public Result listUser(Page page)throws 5@Sb[za
`g7'
)MSy
HibernateException; n}2}4^
I/'>Bn+
} @B+];lr/-
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~34$D],D
>QYxX<W
6 `'^$wKs
java代码: K|iNEhuc
@uc%]V<:k
`+U-oqs
/*Created on 2005-7-15*/ TWy1)30x
package com.adt.service.impl; |nD`0Rbw
xaPTTa
import java.util.List; 7Ev~yY;N
ak%8|'}
import net.sf.hibernate.HibernateException; \o/oM,u
*Nv<,Br,F
import org.flyware.util.page.Page; fSj^/>
import org.flyware.util.page.PageUtil; cB|](gWS~
ST{<G
import com.adt.bo.Result; 1_A< nt?'R
import com.adt.dao.UserDAO; nF=h|rN
import com.adt.exception.ObjectNotFoundException; fNQecDuS
import com.adt.service.UserManager; [K^RC;}nV^
Q WOd&=:
/** !aLL|}S
* @author Joa &TKB8vx=#
*/ %.]qkGZe#
publicclass UserManagerImpl implements UserManager { TtHqdKL
<=WQs2
private UserDAO userDAO; xand%XNv
WO|#`HM2
/** < d?O#(
* @param userDAO The userDAO to set. ^hU7QxW
*/ ,2"-G";!f\
publicvoid setUserDAO(UserDAO userDAO){ K?) &8S
this.userDAO = userDAO; u\50,N9Wp{
} l2xM.vR
<}G7#xg
/* (non-Javadoc) <Dl7|M
* @see com.adt.service.UserManager#listUser ;asB@Q
^dQ#\uy
(org.flyware.util.page.Page) XJGOX
n$/
*/ 66v6do7
public Result listUser(Page page)throws @Kp2l<P
*U8Pjb1
HibernateException, ObjectNotFoundException { :dK/}S0
int totalRecords = userDAO.getUserCount(); Ue!
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if(totalRecords == 0) LXrnAt
throw new ObjectNotFoundException Tw=Jc 's
s~,Y po?
("userNotExist"); 0X.pI1jCO
page = PageUtil.createPage(page, totalRecords); !M6*A1g5
List users = userDAO.getUserByPage(page); SZNM$X|T
returnnew Result(page, users); XB
zcbS+
} _uID3N%
>HXT:0
} Bi9 S1p
tRFj<yuaq
ckS.j)@.c
7?xTJN)G
h#a,<B|
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 abp]qvCV
K}LmU{/t/
询,接下来编写UserDAO的代码: ~J)_S'
#
3. UserDAO 和 UserDAOImpl: /0IvvD!7N
java代码: f.4r'^
OW;]=k/(
vWc =^tT
/*Created on 2005-7-15*/ vvwNJyU-
package com.adt.dao; *F[@lY\p
1^jGSB.%A
import java.util.List; =Q>'?w>
/I(IT=kp
import org.flyware.util.page.Page; >+ulLQqe
jhl9
import net.sf.hibernate.HibernateException; &'Pwz
E<y0;l?H<
/** c 2t<WRG
* @author Joa `7[z%cuK
*/ MOi.bHCQJP
publicinterface UserDAO extends BaseDAO { fMgB!y"Em
m^I+>Bp/:
publicList getUserByName(String name)throws j51Wod<[
lV<2+Is
HibernateException;
+uZ,}J
>$Sc}a3
publicint getUserCount()throws HibernateException; GG<{n$h
%&w 8E[
publicList getUserByPage(Page page)throws 1j"_@?H[
I6@98w}"
HibernateException; o}O"
4LO4SYW7
} J)tk<&X
q% *-4GP
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nK[T.?Nz
TkHyXOk"Ky
java代码: $v5)d J
`Tw DR6&
PW7{,1te,
/*Created on 2005-7-15*/ Zcst$Aro
package com.adt.dao.impl; %8C,9q
/6S% h-#\
import java.util.List; d+DdDr
l}w9c`f
import org.flyware.util.page.Page; }Rl^7h<!
I!LSDi3
import net.sf.hibernate.HibernateException; "wwAbU<
import net.sf.hibernate.Query; ;6+e !h'1
DNTkv_S
import com.adt.dao.UserDAO; ,zXP,(x
Tx)!qpZ
/** a*
2*aH7
* @author Joa w2 %u;D%
*/ *49({TD6`
public class UserDAOImpl extends BaseDAOHibernateImpl !W\Zq+^^J3
@bfW-\ I
implements UserDAO { %3SBs*?
ppYIVI
/* (non-Javadoc) |aWeo.;c
* @see com.adt.dao.UserDAO#getUserByName M8Tj;ATr
y&A0}>a:d
(java.lang.String) &>%R)?SZh
*/ q!fdiv`
publicList getUserByName(String name)throws SK][UxoHm
WF#3'"I
HibernateException { '>"riEk
String querySentence = "FROM user in class t 0 omJP
X6h@K</c^:
com.adt.po.User WHERE user.name=:name"; ;pH&YBY
Query query = getSession().createQuery $~^Y4 }
m
H]I^?+)9
(querySentence); C4,;l^?=%
query.setParameter("name", name); D6Q6yNE
return query.list(); W'98ues%
} pYxdE|2j
E`A6GX
/* (non-Javadoc) aB$xQ|~
* @see com.adt.dao.UserDAO#getUserCount() !k5I#w :
*/ "J.7@\^ h/
publicint getUserCount()throws HibernateException { 0aWy!d
int count = 0; [\_#n5
String querySentence = "SELECT count(*) FROM dGc<{sQzB
n "J+?~9
user in class com.adt.po.User"; MJyz0.9 c
Query query = getSession().createQuery (9!/bX<
Q:v9C ^7
(querySentence); <