Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 K +oFu%
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ?qeBgkL(B^
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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 YEZd8Y
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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 vV.TK_y
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分页支持类: HSk gS
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java代码: Th&*
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package com.javaeye.common.util; =#N;ZG
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import java.util.List; 289@O-
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publicclass PaginationSupport { sp4J%2b
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publicfinalstaticint PAGESIZE = 30; (nk)'ur.
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privateint pageSize = PAGESIZE; &TqY\l
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privateList items; }QszOi\fV1
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privateint totalCount; :"+/M{qz
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privateint[] indexes = newint[0]; wD}ojA&DU
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privateint startIndex = 0; ,6,sz]3-
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public PaginationSupport(List items, int z~TG~_s
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totalCount){ KdT1Nb=
setPageSize(PAGESIZE); 9o<}*L
setTotalCount(totalCount); sd;J(<Ofh
setItems(items); =H T:p:S
setStartIndex(0); Ys@M1o
} ecK{+Z'G
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public PaginationSupport(List items, int LRO'o{4$E
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totalCount, int startIndex){ 60KhwD1
setPageSize(PAGESIZE);
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setTotalCount(totalCount); N=J$+
setItems(items); xjHOrr
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setStartIndex(startIndex); ~7$E\w6
} SST1vzm!
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public PaginationSupport(List items, int k}-@N;zq
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totalCount, int pageSize, int startIndex){ c+PT"/3
setPageSize(pageSize); +@]b}W
setTotalCount(totalCount); t:tT Zh
setItems(items); =%,;=4w
setStartIndex(startIndex); ITj0u&H:
} c[:OK9TH
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publicList getItems(){ $dAQ'\f7
return items; HC0q_%j
} aa8xo5tIp
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publicvoid setItems(List items){ s;'XX}Y
this.items = items; CmaV>
} ]:CU.M1
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publicint getPageSize(){ ueO&%
return pageSize; {C>.fg%t
} N&`VMEB)k
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publicvoid setPageSize(int pageSize){ Ue:'55
this.pageSize = pageSize; 7^|oO~x6
} <3dmY=
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publicint getTotalCount(){ e0O2>w
return totalCount; Z%3]
} Bl5*sfjG
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publicvoid setTotalCount(int totalCount){ ZMmaM "9
if(totalCount > 0){ l[=7<F
this.totalCount = totalCount; YQ}xr^VA
int count = totalCount / t^0^He$Ot
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pageSize; l4+!H\2
if(totalCount % pageSize > 0) NET?Ep
count++; JcsJfTI
indexes = newint[count]; (lwrk(
for(int i = 0; i < count; i++){ <rUH\z5cP
indexes = pageSize * KlMrM% ;y
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} ?Xm!;sS0
}else{ 8H4"mxO
this.totalCount = 0; Jx;"@
} o:ki IZ]
} ~F8M_
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publicint[] getIndexes(){ c$),/0td|
return indexes; {6%vmMbJ
} Fj\}&H*+
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publicvoid setIndexes(int[] indexes){ t3ua5xw
this.indexes = indexes; uP<w rlW
} 5urM,1SQ@
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publicint getStartIndex(){ sS 5 ]d8
return startIndex; zx"'WM*
} 6~8A$:
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publicvoid setStartIndex(int startIndex){ x\t)uM%
if(totalCount <= 0) Zw+VcZz3
this.startIndex = 0; pKDP1S#<
elseif(startIndex >= totalCount) 8Xpf|?.
this.startIndex = indexes K8NoY6
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[indexes.length - 1]; j.Ro(0%
elseif(startIndex < 0) hS]g^S==2h
this.startIndex = 0; [r'PGx
else{ Y 1a[HF^-
this.startIndex = indexes ,bT|:T@ny
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[startIndex / pageSize];
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} B6)d2O9C
} DQ7+
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publicint getNextIndex(){ ;xFx%^M}br
int nextIndex = getStartIndex() + n>]`8+a~%X
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pageSize; )%rGD
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if(nextIndex >= totalCount) X|+ o4R?
return getStartIndex(); z@\C/wX
else &$yC+cf
return nextIndex; n4Fh*d ixg
} 8A/;a{
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publicint getPreviousIndex(){ 4Q2=\-KFj
int previousIndex = getStartIndex() - }7iWm XlI
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pageSize; tpe:]T/xh
if(previousIndex < 0) *,$cW,LN
return0; 9(?9yFbj5
else Cz=HxU80J
return previousIndex; E$5)]<p! <
} dQ6:c7hp>D
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} z-<091,
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抽象业务类 hE>ux"_2/
java代码: y<7C!E#b8
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/** e?W-vi%
* Created on 2005-7-12 '<N^u@tF7
*/ m0xL'g6F
package com.javaeye.common.business; #clOpyT*
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import java.io.Serializable; ; MU8@?yN
import java.util.List; C[f'1O7
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import org.hibernate.Criteria; w,hl<=:(FB
import org.hibernate.HibernateException; ^mWOQ*zi;
import org.hibernate.Session; /Qh
import org.hibernate.criterion.DetachedCriteria; C9^[A4O@X!
import org.hibernate.criterion.Projections; 3WdYDv]N}L
import \)Sa!XLfT
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org.springframework.orm.hibernate3.HibernateCallback; ovv<7`
import .FUws
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org.springframework.orm.hibernate3.support.HibernateDaoS D$C >ZF
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upport; U5 X\RXy~
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import com.javaeye.common.util.PaginationSupport; sT.;*3{
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public abstract class AbstractManager extends 0V*B3V<
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HibernateDaoSupport { Hc?8Q\O:
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privateboolean cacheQueries = false; Q]j[+e
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privateString queryCacheRegion;
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publicvoid setCacheQueries(boolean ;Du+C%
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cacheQueries){ bI~ R6o
this.cacheQueries = cacheQueries; WZz8VF
} Cjh0 .{
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publicvoid setQueryCacheRegion(String '@4Myg* b
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queryCacheRegion){ q18IqY*Lo
this.queryCacheRegion = W?y7mw_S
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queryCacheRegion; `SDpOqfIrP
} a]0B{
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publicvoid save(finalObject entity){ ODvlix
getHibernateTemplate().save(entity); [ .]x y
} p
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publicvoid persist(finalObject entity){ HEqTlnxUu
getHibernateTemplate().save(entity); R8[l\Y>Ec
} ?HD(EGdx
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publicvoid update(finalObject entity){ &(M][Uo{|'
getHibernateTemplate().update(entity); s98Jh(~
} Y
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publicvoid delete(finalObject entity){ .3xpDVW^e
getHibernateTemplate().delete(entity); &BF97%E2
} :bBLP7eyV
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publicObject load(finalClass entity,
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finalSerializable id){ @bPR"j5D
return getHibernateTemplate().load /j7e
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(entity, id); hw2'.}B"(
} #vwK6'z
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publicObject get(finalClass entity, z{wW6sgPr
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finalSerializable id){ pe}mA}9U
return getHibernateTemplate().get .bdp=vbA
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(entity, id); U}#3LFr.?
} %"<|u)E
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publicList findAll(finalClass entity){ /l.:GH36f
return getHibernateTemplate().find("from 4OX2GH=W
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" + entity.getName()); u^6@!M
} Q#k Sp8
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publicList findByNamedQuery(finalString EY$Dtb+g8
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namedQuery){ QoLp$1O(y
return getHibernateTemplate ?L K
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().findByNamedQuery(namedQuery); ar&j1""
} }-Ds%L
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publicList findByNamedQuery(finalString query, "Wz8f
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finalObject parameter){ ni2GZ<1j
return getHibernateTemplate Dx)>`yJk$;
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().findByNamedQuery(query, parameter); V /.Na(C~
} `!Z0;qk
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publicList findByNamedQuery(finalString query, 3!l+)g
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finalObject[] parameters){ D_SXxP[! g
return getHibernateTemplate ^"dVz.
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().findByNamedQuery(query, parameters); 8+f{ /
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publicList find(finalString query){ 0sMNp
return getHibernateTemplate().find ]!c59%f=
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(query); J#>)+
} a/\SPXQ/9
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publicList find(finalString query, finalObject x/fhlf}a}=
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parameter){ -(dtAo6
return getHibernateTemplate().find k!Ym<RD%N
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(query, parameter); 9T\uOaC"
} .B+Bl/
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public PaginationSupport findPageByCriteria OXxgnn>W'
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(final DetachedCriteria detachedCriteria){ ybC0Ee@
return findPageByCriteria =ea'G>;[H
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); AqA.,;G
} QO/nUl0E
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public PaginationSupport findPageByCriteria |C"zK
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(final DetachedCriteria detachedCriteria, finalint SHc?C&^S
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startIndex){ $$
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return findPageByCriteria s||c#+j"8
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(detachedCriteria, PaginationSupport.PAGESIZE, tCR#TW+IY-
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startIndex); mP ]a}[
} &s(mbpV
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public PaginationSupport findPageByCriteria zNO,vR[\
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(final DetachedCriteria detachedCriteria, finalint }Ip1|Gj
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pageSize, ri2`M\;gt
finalint startIndex){ [k]3#<sS
return(PaginationSupport) 2M>`W5
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getHibernateTemplate().execute(new HibernateCallback(){ b&*)C#7/T
publicObject doInHibernate kXgc'w6EhF
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(Session session)throws HibernateException { Lng@'Yr
Criteria criteria = +,_%9v?3
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detachedCriteria.getExecutableCriteria(session); $!vK#8-&{
int totalCount = {pXqw'"1.
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((Integer) criteria.setProjection(Projections.rowCount '-BD.^!!
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()).uniqueResult()).intValue(); k#n%at.g
criteria.setProjection Yw6uh4
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(null); iHT=ROL
List items = cAn_:^
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criteria.setFirstResult(startIndex).setMaxResults 25;(`Td5
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(pageSize).list(); L1kAAR
PaginationSupport ps = b"nD5r
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new PaginationSupport(items, totalCount, pageSize, #fDM{f0]R
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startIndex); q8}he~a
return ps; !ou;yE&<,
} s &f\gp1
}, true); oS~;>]W
} Wjli(sT#-
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public List findAllByCriteria(final 1/v#Z#3[
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DetachedCriteria detachedCriteria){ Y(Y#H$w
return(List) getHibernateTemplate vwzElZ{C:v
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().execute(new HibernateCallback(){ "|BSGV!8
publicObject doInHibernate V ONC<wC
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(Session session)throws HibernateException { y@r0"cvz9
Criteria criteria = BZ(DP_}&D
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detachedCriteria.getExecutableCriteria(session); pwRCfR)" X
return criteria.list(); &(m01
} *;F:6p4_
}, true); Lf`<4 P
} C#B|^A_
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public int getCountByCriteria(final @aP1[( m
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DetachedCriteria detachedCriteria){ A1*\ \[
Integer count = (Integer) _j*a5fsPU
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getHibernateTemplate().execute(new HibernateCallback(){ $&&+2?cx0
publicObject doInHibernate 1B@7#ozWA?
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(Session session)throws HibernateException { {q^UWv?1
Criteria criteria = xz~Y
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detachedCriteria.getExecutableCriteria(session); X|aD>CT
return y8Rq2jI;(e
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criteria.setProjection(Projections.rowCount 3"sXN)j
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()).uniqueResult(); c7.M\f P
} >hzSd@J&
}, true); ,N
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return count.intValue(); (/E@.z[1
} 0\,!
} nTD4^'
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用户在web层构造查询条件detachedCriteria,和可选的 TF 80WMt
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 BO8?{~i
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PaginationSupport的实例ps。 :98:U~d1
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ps.getItems()得到已分页好的结果集 +N'&6z0Wf
ps.getIndexes()得到分页索引的数组 @(0O9L
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ps.getTotalCount()得到总结果数 4dm0:,
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ps.getStartIndex()当前分页索引 ~,Yd.?.TI
ps.getNextIndex()下一页索引 IfT: 9
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ps.getPreviousIndex()上一页索引 /x4L,UJ= P
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 8n:N#4Dh^
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 m77!i>V)
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一下代码重构了。 m# -&<=
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我把原本我的做法也提供出来供大家讨论吧: T%;NW|mH&
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首先,为了实现分页查询,我封装了一个Page类: jp1e3 Cg
java代码: !}5rd\
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/*Created on 2005-4-14*/ :G]t=vr1
package org.flyware.util.page; uy<<m"cA;
@%YbptT}
/** {;6a_L@q;|
* @author Joa ;}M&fXFp"|
* Z[0/x.pp$
*/ 4Xww(5?3
publicclass Page { `m#i|8
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/** imply if the page has previous page */ @=
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privateboolean hasPrePage; PS=q):R|
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/** imply if the page has next page */ B@#vS=g
privateboolean hasNextPage; k8l7.e*
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/** the number of every page */ h0HK~S#xBv
privateint everyPage; ~|N,{GaL
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/** the total page number */ 0cVxP)J+
privateint totalPage; mIPDF1=)
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/** the number of current page */ KD\sU6
privateint currentPage; 3(nnN[?N,5
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/** the begin index of the records by the current =-&h@mB;G
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query */ >_ G'o
privateint beginIndex; 2E`mbT,v&
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/** The default constructor */ `M(st%@n
public Page(){ !w@i,zqu
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} "@|rU4Y
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/** construct the page by everyPage X[f)0w%
* @param everyPage c-!3wvt)
* */ B(5>H2
public Page(int everyPage){ ^SW9J^9
this.everyPage = everyPage; K4+|K:e
} 71ab&V il
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/** The whole constructor */ uu"hu||0_
public Page(boolean hasPrePage, boolean hasNextPage, k@h0 }%
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int everyPage, int totalPage, N R4\TU
int currentPage, int beginIndex){ }B!io-}
this.hasPrePage = hasPrePage; ;>;it5 l=
this.hasNextPage = hasNextPage; <G`1(,g
this.everyPage = everyPage; 1L!jI2~x}
this.totalPage = totalPage; ;*ULrX4[
this.currentPage = currentPage; {"2CI^!/U.
this.beginIndex = beginIndex; )[r=(6?n
} ~jmI`X/
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/** g}uSIv^
* @return pYu6[
* Returns the beginIndex. /L5:/Z
*/ q_mxZM
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publicint getBeginIndex(){ jzZ]+'t
return beginIndex; 8OO[Le]1
}
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/** O6ugN-d>
* @param beginIndex M%W#0
* The beginIndex to set. 7s!rer>
*/ AT1{D!b
publicvoid setBeginIndex(int beginIndex){ ;:+2.//
this.beginIndex = beginIndex; n}fV$qu
} yy&L&