Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 >+
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Kej|1g1f
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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 uxOJ3
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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 {/d4PI7)tK
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分页支持类: cJ(BiL-uF
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java代码: QqtC`H\
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package com.javaeye.common.util; {'h_'Y`bOQ
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import java.util.List; zF5q=9 4$
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publicclass PaginationSupport { p jKt:R}
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publicfinalstaticint PAGESIZE = 30; 4:vTxNs&S
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privateint pageSize = PAGESIZE; _>Pk8~m
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privateList items; 3Y
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privateint totalCount; {A|bBg1!
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privateint[] indexes = newint[0]; L[9OVD
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privateint startIndex = 0; qZaO&"q
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public PaginationSupport(List items, int D(Qa>B"1
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totalCount){ |olNA*4
setPageSize(PAGESIZE); +?;j&p
setTotalCount(totalCount); IX9K.f
setItems(items); 1otspOy
setStartIndex(0); Z_FNIM0f
} 6xHi\L
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public PaginationSupport(List items, int xf/m!b"p
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totalCount, int startIndex){ %e{(twp
setPageSize(PAGESIZE); ivfXat-
setTotalCount(totalCount); pI>*u ]x
setItems(items); "tL2F*F"6X
setStartIndex(startIndex); HA!t$[_Ve
} ==N` !+
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public PaginationSupport(List items, int asr=m{C"
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totalCount, int pageSize, int startIndex){ tMFsA`ng
setPageSize(pageSize); WfG(JJ
setTotalCount(totalCount); R)+t]}
setItems(items); 7^MX l
setStartIndex(startIndex); KCUU#t|8V\
} L/?]^!.
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publicList getItems(){ (#o t^
return items; _ h9o@
} 2n|CD|V$ux
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publicvoid setItems(List items){ F;u_7OM
this.items = items; ZenPw1 -
} Oz{%k#X-
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publicint getPageSize(){ d(7NO;S8
return pageSize; h^oH^moq<
} `T"rG}c
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publicvoid setPageSize(int pageSize){ uZIJoT
this.pageSize = pageSize; _KN/@(+F
} ?NG=8.p
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publicint getTotalCount(){ +Ok%e.\ZM
return totalCount; 6~8F!b2
} Z\? E3j
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publicvoid setTotalCount(int totalCount){ #@qN8J}R
if(totalCount > 0){ ?6P.b6m}0
this.totalCount = totalCount; zO~9zlik
int count = totalCount / W7=V{}b+
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pageSize; >jx.R
if(totalCount % pageSize > 0) OgCy4_a[f
count++; M#,Q
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indexes = newint[count]; S8vV!xO
for(int i = 0; i < count; i++){ zY=jXa)K~
indexes = pageSize * 2.lgT|p
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} 1;lmu]I>)
}else{ L}%dCe
this.totalCount = 0; bw4oLu?
} 7J*N_8?2
} "y;bsZBd"
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publicint[] getIndexes(){ @ -:]P8
return indexes; ^,8R,S\}$
} }|wv]U~
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publicvoid setIndexes(int[] indexes){ y\c"b-lQX
this.indexes = indexes; q]% T:A=
} Pbu{'y3J
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publicint getStartIndex(){ [xZU!=
return startIndex; >mq,}!n
} SOf{Hx0C6
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publicvoid setStartIndex(int startIndex){ sLL7]m}
if(totalCount <= 0) %O[N}_XHEh
this.startIndex = 0; !#yq@2QX
elseif(startIndex >= totalCount) GqKsK
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this.startIndex = indexes !Ng=Yk>3
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[indexes.length - 1]; =8{WZCW5
elseif(startIndex < 0) 5F"|E-;
this.startIndex = 0; 3_$w|ET
else{ vH[47Cv G5
this.startIndex = indexes GW^,g@%C
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[startIndex / pageSize]; 1bnBji
} U7@AC}.+
} w'T q3-%V
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publicint getNextIndex(){ 23F/\2MSG
int nextIndex = getStartIndex() + _fk#<
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pageSize; A^ \.Z4=d"
if(nextIndex >= totalCount) NpP')m!`}
return getStartIndex(); YIRZ+H<Q
else ~&dyRtW4
return nextIndex; (2ot5x}`j
} 2}6%qgnT-
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publicint getPreviousIndex(){ 4BL;FO
int previousIndex = getStartIndex() - }L=/A7Nk>
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pageSize; ^2D1`,|N
if(previousIndex < 0) }|OaL*|u
return0; "p&Y^]
else tC?=E#3V
return previousIndex; (& "su3z
} C*=Xk/0
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} Kb#4ILA
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抽象业务类 $,=6[T!z+e
java代码: 5@IB39
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/** >zsid:
* Created on 2005-7-12 >2$5eI
*/ |:[tNs*,O
package com.javaeye.common.business; _/8FRkx
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import java.io.Serializable; S1Z2_V
import java.util.List; TNCgaTJ{h
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import org.hibernate.Criteria; 'FlJpA}
import org.hibernate.HibernateException; 6vuq1
import org.hibernate.Session; H&1[nU{?>
import org.hibernate.criterion.DetachedCriteria; O RGD
import org.hibernate.criterion.Projections; FMNm,O]
import =ph&sn$;L
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org.springframework.orm.hibernate3.HibernateCallback; WARb"8Kg
import ZUz ^!d
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org.springframework.orm.hibernate3.support.HibernateDaoS PWh^[Rd)
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upport; 9I1tN
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import com.javaeye.common.util.PaginationSupport; IdYzgDH
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public abstract class AbstractManager extends u p.Q>28r
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HibernateDaoSupport { F:*W5xX
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privateboolean cacheQueries = false; .Ha'p.
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privateString queryCacheRegion; WZOY)>K
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publicvoid setCacheQueries(boolean mNmLyU=d
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cacheQueries){ j1_@qns{
this.cacheQueries = cacheQueries; 9lB]~,z
} hN['7:bQ
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publicvoid setQueryCacheRegion(String ~/mwx8~
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queryCacheRegion){ uB!kM
this.queryCacheRegion = .(pN5JI*
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queryCacheRegion; ;'81jbh
} t){"Tfc:
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publicvoid save(finalObject entity){ !"e5~7
getHibernateTemplate().save(entity); hp{OL< 2M
} kdb(I@6
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publicvoid persist(finalObject entity){ 2e$w?W0^
getHibernateTemplate().save(entity); Lm@vXgMD
} ##Z_QB(;
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publicvoid update(finalObject entity){ J9K3s_SN
getHibernateTemplate().update(entity); E*# ]**
} VCtH%v#S;.
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publicvoid delete(finalObject entity){ "5eNLqt^q
getHibernateTemplate().delete(entity);
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} _|"Y]:j_
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publicObject load(finalClass entity, ~rjTF!
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finalSerializable id){ :VF<9@t
return getHibernateTemplate().load w[6J
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(entity, id); ~4?9a(>3
} *xp\4;B
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publicObject get(finalClass entity, ' oFxR003
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finalSerializable id){ tK
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return getHibernateTemplate().get [o*7FEM|<
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(entity, id); 6\61~u ~
} erVO|<%=R
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publicList findAll(finalClass entity){ #z1H8CFL"
return getHibernateTemplate().find("from XJ2^MF2BU
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" + entity.getName()); >J u]2++lx
} -48vJR*tC
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publicList findByNamedQuery(finalString pH`44KAuM
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namedQuery){ 4nAa`(62
return getHibernateTemplate QM?#{%31
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().findByNamedQuery(namedQuery); 'Wa,OFd\8
} b,KcBQ.
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publicList findByNamedQuery(finalString query, inlk++Og
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finalObject parameter){ fr!Pj(Q1
return getHibernateTemplate f@co<iA
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().findByNamedQuery(query, parameter); |pa$*/!NT
} 2 1PFR:lP7
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publicList findByNamedQuery(finalString query, vd6l7"0/
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finalObject[] parameters){ :rP#I#,7w
return getHibernateTemplate US
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().findByNamedQuery(query, parameters); F7")]q3I~
} <_(/X,kBK
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publicList find(finalString query){ >hH0Q5aL
return getHibernateTemplate().find e6_ZjrQf
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(query); %7g:}O$
} B^%1Rpcn
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publicList find(finalString query, finalObject `>o?CIdp
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parameter){ lgpW@g
return getHibernateTemplate().find OIl#DV.
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(query, parameter); t*@z8<H
} |j3'eW&=
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public PaginationSupport findPageByCriteria ,7XtH>2s
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(final DetachedCriteria detachedCriteria){ 5'a3huRtV
return findPageByCriteria fSDi-I
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); lcV<MDS
} |y20Hi':
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public PaginationSupport findPageByCriteria jPnM>=
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(final DetachedCriteria detachedCriteria, finalint RllY-JBO
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startIndex){ oUQ07z\C
return findPageByCriteria 4em;+ >D6
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(detachedCriteria, PaginationSupport.PAGESIZE, (Toq^+`c
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startIndex); L!_ZY
} /m _kn
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public PaginationSupport findPageByCriteria .}')f;jH5<
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(final DetachedCriteria detachedCriteria, finalint kX:tc
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pageSize, 9;%CHb&
finalint startIndex){ x_|F|9
return(PaginationSupport) {2`=qt2
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getHibernateTemplate().execute(new HibernateCallback(){ >\ST-7[^L
publicObject doInHibernate $>U#
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(Session session)throws HibernateException { >s3gqSDR
Criteria criteria = )Z+{|^`kJ
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detachedCriteria.getExecutableCriteria(session); gfU-"VpHE
int totalCount = avp;*G}
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((Integer) criteria.setProjection(Projections.rowCount HmK*b Z
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()).uniqueResult()).intValue(); JFL>nH0mk.
criteria.setProjection 8
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(null); Q
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List items = h?\2_s
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criteria.setFirstResult(startIndex).setMaxResults 'cDx{?
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(pageSize).list(); ihT~xt
PaginationSupport ps = nA>sHy
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new PaginationSupport(items, totalCount, pageSize, KRsAv^']
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startIndex); v}J;ZIb
return ps; h!&sNzX
} V's:>;
}, true); R4%P:qM
} puJ#w1!x`
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public List findAllByCriteria(final .DJDpP)M
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DetachedCriteria detachedCriteria){ h$C@j~
return(List) getHibernateTemplate e`{0d{Nd
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().execute(new HibernateCallback(){ N$?cX(|7
publicObject doInHibernate '!vc/Hw
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(Session session)throws HibernateException { xSpC'"
Criteria criteria = 5T4"j;_.BL
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detachedCriteria.getExecutableCriteria(session); ;Hm'6TR!
return criteria.list(); IKvBf'%-
} |pZo2F!.
}, true); oL/o*^
} MBk"KF
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public int getCountByCriteria(final VmQh$&h
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DetachedCriteria detachedCriteria){ jeN1eM8WI
Integer count = (Integer) .")b?#K
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getHibernateTemplate().execute(new HibernateCallback(){ +?-qfp,:0
publicObject doInHibernate mp`PE=
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(Session session)throws HibernateException { [j6~}zu@
Criteria criteria = yYAnwf
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detachedCriteria.getExecutableCriteria(session); GCE!$W
return % mn />
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criteria.setProjection(Projections.rowCount 9n}A ^
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()).uniqueResult(); L@|#Bbmx
} +!&$SNLh(
}, true); q
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return count.intValue(); V> a*3D
} `\FI7s3b
} ^JhFI*
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用户在web层构造查询条件detachedCriteria,和可选的 kJ8vKcc
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 <%!J?
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PaginationSupport的实例ps。 &G{2s J5{
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ps.getItems()得到已分页好的结果集 Z H-5Qy_
ps.getIndexes()得到分页索引的数组 *C_[jk@6
ps.getTotalCount()得到总结果数 CX+9R3pa
ps.getStartIndex()当前分页索引 qc0 B<,x7
ps.getNextIndex()下一页索引 QFzFL-H~N
ps.getPreviousIndex()上一页索引 ,+-? Zv 2
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 AP@<r
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,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 _<u;4RO(s
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一下代码重构了。 $xcv >
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我把原本我的做法也提供出来供大家讨论吧: 7)PJ:4IqS
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