Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 >_Dq )n;%
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ^0/FZ)V8
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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 3+_
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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 /-qSYS(
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分页支持类: gJ_{V;R
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java代码: 2Qqk?;^1
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package com.javaeye.common.util; iINd*eXb^
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import java.util.List; brA\Fp^
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publicclass PaginationSupport { hlpi-oW`
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publicfinalstaticint PAGESIZE = 30; p`jkyi
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privateint pageSize = PAGESIZE; GHaOFLY
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privateList items; 0,a;N%K-
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privateint totalCount;
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privateint[] indexes = newint[0]; Une,Y4{u
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privateint startIndex = 0; X|}yp|
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public PaginationSupport(List items, int 4!pMZ<$3
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totalCount){ cnQ;6LtFTz
setPageSize(PAGESIZE); c/Fy1Lv\
setTotalCount(totalCount); Ak`7 f$z
setItems(items); g-0?8q5T6
setStartIndex(0); ]d$:R`;
} y9cDPwi:b
}fps~R
public PaginationSupport(List items, int >+iJ(jqq
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totalCount, int startIndex){ b^wL{q
setPageSize(PAGESIZE); &_-,Nxsf
setTotalCount(totalCount); Y40`~
setItems(items); &@tD/Jw3
setStartIndex(startIndex); :a M
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} zW^_w&fd^j
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public PaginationSupport(List items, int G_GV
'c[[H3s!;
totalCount, int pageSize, int startIndex){ <l/QS3M
setPageSize(pageSize); tC0:w,C)
setTotalCount(totalCount); Z)?i&y?
setItems(items); &Kuo|=f
setStartIndex(startIndex); kdVc;v/5
} AJ_''%$I3:
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publicList getItems(){ C&\MDOjx
return items; ~)\9f 1O{^
} A"(XrL-pV
gnjh=anVX1
publicvoid setItems(List items){ b&AGVWhh
this.items = items; `mar-r_m
} J#h2~Hz!
= GN1l[X
publicint getPageSize(){ 3/rEXKS
return pageSize; xbbQ)sH&m
} y0!-].5UH
\LYB% K}
publicvoid setPageSize(int pageSize){ 4e6x1`Y{xB
this.pageSize = pageSize; p"A2N+
} KxyD{W1
oy8L{8?
publicint getTotalCount(){ X$aN:!1
return totalCount; F't4Q
} Wpgp YcPS
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publicvoid setTotalCount(int totalCount){ K(&I8vAp
if(totalCount > 0){ KIY/nu
this.totalCount = totalCount; Akar@ wh
int count = totalCount / en6Kdqe
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pageSize; }V20~ hi
if(totalCount % pageSize > 0) qH#?, sK ^
count++; ;DQ{6(
indexes = newint[count]; W7bA#p(
for(int i = 0; i < count; i++){ ( v<l9}!
indexes = pageSize * {y5v"GR{YM
05
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i; Lp!4X1/|\
} Y nD_:ZK
}else{ :c4iXK0_^?
this.totalCount = 0; %N jRD|
} s(~tL-_ K
} xF:}a:c@H
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publicint[] getIndexes(){ 1r!o,0!d-'
return indexes; )uj:k*`)
} C[E[|s*l
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publicvoid setIndexes(int[] indexes){ 8>U{>]WG
this.indexes = indexes; \<cs:C\h7
} v[k;R
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publicint getStartIndex(){ R^v-%mG9
return startIndex; uu5AW=j
} MR= dQc
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publicvoid setStartIndex(int startIndex){ 9%{V?r]k
if(totalCount <= 0) %y7&~me
this.startIndex = 0; .A(QqL>
elseif(startIndex >= totalCount) U*P&O+(1'
this.startIndex = indexes pr\wI?:k
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[indexes.length - 1]; 7D5[
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elseif(startIndex < 0) {..6{~L
this.startIndex = 0; ivgV5)".
else{ w'[^RZW:j
this.startIndex = indexes C?xah?Sk
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[startIndex / pageSize];
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} uPe&i5YR
} l(irNKutgo
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publicint getNextIndex(){ T^z
int nextIndex = getStartIndex() + B^7B-RBi0
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pageSize; w^{qut.
if(nextIndex >= totalCount) _*K=Z,a;\
return getStartIndex(); fT]hpoJl
else Ch] `@(l
return nextIndex; ;u:A:Y4V
} ~J~@mE2ks
xE$>;30b_
publicint getPreviousIndex(){ xbVvK+
int previousIndex = getStartIndex() - 8fI]QW
nj90`O.K
pageSize; V(lxkEu/Fj
if(previousIndex < 0) 3^jkd)xw
return0; M%yeI{m
else ?*{Vn5aX{
return previousIndex; x=S8UKUx
} oouhP1py,
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} pB;U*lt
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抽象业务类 U"qR6
java代码: QIK;kjr*A3
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/** j1Ns|oph1
* Created on 2005-7-12 bjL8Wpk
*/ o4.?m6d
package com.javaeye.common.business; 7>-"r*W +z
v=pkze
import java.io.Serializable; bZ5cKQ\6
import java.util.List; R!+_mPb=Q*
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import org.hibernate.Criteria; YcRo>:I
import org.hibernate.HibernateException; M~?2g.o'D
import org.hibernate.Session; jqzG=/0~{
import org.hibernate.criterion.DetachedCriteria; 6"o,)e/z
import org.hibernate.criterion.Projections; T)Uhp
import ,(;T V_@$
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org.springframework.orm.hibernate3.HibernateCallback; cv=H6j]h|
import ?hFG+`"W
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org.springframework.orm.hibernate3.support.HibernateDaoS 6_=t~9sY
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upport; J<9;Ix8R
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import com.javaeye.common.util.PaginationSupport; >h
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public abstract class AbstractManager extends X/8TRiTFv
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HibernateDaoSupport { =Hd+KvA
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privateboolean cacheQueries = false; w/oXFs&FK
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privateString queryCacheRegion; 2ophh/]
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publicvoid setCacheQueries(boolean d71|(`&
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cacheQueries){ } %bP9
this.cacheQueries = cacheQueries; _SQQS67fu"
} g7l?/p[n
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publicvoid setQueryCacheRegion(String #dj,=^1_14
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queryCacheRegion){ W#bOx0
this.queryCacheRegion = Lz/{
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j /)A<j$
queryCacheRegion; 2:jWO_V@
} 7Eo;TNbb
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publicvoid save(finalObject entity){ lJJ`aYDp
getHibernateTemplate().save(entity); !+)5?o
} &&>Tfzh
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publicvoid persist(finalObject entity){ '89nyx&W
getHibernateTemplate().save(entity); .At^b4#(
} qa>H@`P
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publicvoid update(finalObject entity){ dcH@$D@~S
getHibernateTemplate().update(entity); DX(!G a
} kQ99{lH,5
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publicvoid delete(finalObject entity){ 2EC<8}CG
getHibernateTemplate().delete(entity); B1k;!@@14
} }8Yu"P${Y
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publicObject load(finalClass entity, `L
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finalSerializable id){ #JYH5:*
return getHibernateTemplate().load ?m\?
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(entity, id); -%ftPfm
} ,382O$C
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publicObject get(finalClass entity, ^JY,K
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finalSerializable id){ DmiZ"A
return getHibernateTemplate().get )1E#'v12"
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(entity, id); H{,qw%.|KA
} ^US ol/
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publicList findAll(finalClass entity){ '&!:5R5 9
return getHibernateTemplate().find("from I\~sE Jwj
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" + entity.getName()); .H}#,pQ}l
} zF@/8#
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publicList findByNamedQuery(finalString uWkn}P
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namedQuery){ eE5j6`5i
return getHibernateTemplate h1+y.4
q+U&lw|"w
().findByNamedQuery(namedQuery); ]-{A"tJ
} m9mkZ:r(kV
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publicList findByNamedQuery(finalString query, f/vsf&^O
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finalObject parameter){ s-Qq#T
return getHibernateTemplate =3EE-%eF!
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().findByNamedQuery(query, parameter); !7n`-#)
} 6B!v;93U
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publicList findByNamedQuery(finalString query, &W{<Yf9
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finalObject[] parameters){ =h\uC).t&
return getHibernateTemplate mCSt.n~
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().findByNamedQuery(query, parameters); N gagzsJ=
} 9dwLkr
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publicList find(finalString query){ 5"&=BD~D
return getHibernateTemplate().find 9cQ;h37J>
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(query); }$` PZUw>
} cuh Z_l
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publicList find(finalString query, finalObject jE2EoQi,
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parameter){ 'x u!t'l&
return getHibernateTemplate().find ke2}@|?t
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(query, parameter); 'iX y?l
} |4!G@-2V:I
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public PaginationSupport findPageByCriteria OWZ;X}x
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(final DetachedCriteria detachedCriteria){ >">grDX
return findPageByCriteria F./P,hhN9
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 59H~qE1Md
} &F.L*M
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public PaginationSupport findPageByCriteria Ki dbcZ
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(final DetachedCriteria detachedCriteria, finalint q{XeRQ'/
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startIndex){ v+W4wD
return findPageByCriteria wPvYnhr|G-
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(detachedCriteria, PaginationSupport.PAGESIZE, xTy)qN]P
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startIndex); T~~K~a\8
} 5zPn-1uW
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public PaginationSupport findPageByCriteria cd;~60@K
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(final DetachedCriteria detachedCriteria, finalint NdB:2P
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pageSize, kudXwj
finalint startIndex){ hR,5U=+M7
return(PaginationSupport) |XJ|vQGU
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getHibernateTemplate().execute(new HibernateCallback(){ m0N{%Mf-
publicObject doInHibernate a"8H(HAlNn
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(Session session)throws HibernateException { @@& ?,3
Criteria criteria = {-51rAyi
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detachedCriteria.getExecutableCriteria(session); fJ;1ii~
int totalCount = "\qm +g
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((Integer) criteria.setProjection(Projections.rowCount S$qpClXS,
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()).uniqueResult()).intValue(); UB]]oC<
criteria.setProjection F6Qnz8|
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(null); WQv`%%G2>
List items = rSKZc`<^
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criteria.setFirstResult(startIndex).setMaxResults f\~A72-
P9M. J^<
(pageSize).list(); lL*"N|Y
PaginationSupport ps = v\R-G
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new PaginationSupport(items, totalCount, pageSize, 5>>JQ2'W
@DK`#,
startIndex); `%$+rbo~
return ps; sV`p3L8pl
} zd3^k<
}, true); ~N8$abQJV
} m{by%
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public List findAllByCriteria(final Q1P=A:*]9
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DetachedCriteria detachedCriteria){ 7w.9PNhy
return(List) getHibernateTemplate hlGrnL
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().execute(new HibernateCallback(){ LUEZqIf
publicObject doInHibernate -EG=}uT['b
:_kZkWD5
(Session session)throws HibernateException { k;
ned
Criteria criteria = }r|$\ms
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detachedCriteria.getExecutableCriteria(session); |)%;B%
return criteria.list(); Wo~;h(6
} g1&q6wCg|
}, true); > mEB,
} z)%]#QO
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public int getCountByCriteria(final "ed
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DetachedCriteria detachedCriteria){ l a>H&
Integer count = (Integer) Tb!jIe
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getHibernateTemplate().execute(new HibernateCallback(){ yE|hA2G?0
publicObject doInHibernate EU.!/'<
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(Session session)throws HibernateException { ,=dc-%J
Criteria criteria = !mK}Rim~
y0,>_MS
detachedCriteria.getExecutableCriteria(session); MbXtmQ%C8
return sZ#U{LI
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criteria.setProjection(Projections.rowCount y':65NMda
d*l2x[8}g-
()).uniqueResult(); , nW)A/?}
} w-LaSJ(T
}, true); CM;B{*En
return count.intValue(); lbMok/a2o
} iIc/%<
;
} %nyZ=&u
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用户在web层构造查询条件detachedCriteria,和可选的 om8`^P/b
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 UHX,s
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PaginationSupport的实例ps。 ^a=V.
7myYs7N8[
ps.getItems()得到已分页好的结果集 r+,JM L
ps.getIndexes()得到分页索引的数组 =L*-2cE6#
ps.getTotalCount()得到总结果数 Z*YS7 ~
ps.getStartIndex()当前分页索引 n,`j~.l-=>
ps.getNextIndex()下一页索引 C&;m56
ps.getPreviousIndex()上一页索引 _xr@dK<
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 SDko#
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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 a!\^O).pA
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一下代码重构了。 WMnxN34
/hAy1V6
我把原本我的做法也提供出来供大家讨论吧: 3 V$
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首先,为了实现分页查询,我封装了一个Page类: afd.v$63
java代码: hpo*5Va
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/*Created on 2005-4-14*/ vCn\_Nu;W&
package org.flyware.util.page; U+:Mu]97
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/** JN3&(t
* @author Joa Gp2Cwyv
* NGmXF_kqN
*/ o':K4r;
publicclass Page { IgPU^?sp
B]:?4Ov
/** imply if the page has previous page */ 7E;`1lh7
privateboolean hasPrePage; vGchKN~_
l f_q6y
/** imply if the page has next page */ q>[}JtXK
privateboolean hasNextPage; (Ji=fh+
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/** the number of every page */ Nh1,
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privateint everyPage; *kt%.wPJ
fr8hT(,s)
/** the total page number */ n,Q^M$mS0
privateint totalPage; O}X@QG2_
cpM]APF-
/** the number of current page */ aMaqlqf
privateint currentPage; U3t)yr h
SbH} cu8
/** the begin index of the records by the current /@@?0xjX
\omfWWpK
query */ UD^=@?^7
privateint beginIndex; @*iT%p_L
ek` 6 Uf
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/** The default constructor */ rmPJid[8B~
public Page(){ Wt!8.d}=
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} NGkWr
QT\"r T9#
/** construct the page by everyPage @^nE^;
* @param everyPage dm"|\7
* */ %9_jF"
public Page(int everyPage){ W/u_<\
this.everyPage = everyPage; E+~1GKd
} r=<1*u
Xuj=V?5
/** The whole constructor */ Za7!n{?0
public Page(boolean hasPrePage, boolean hasNextPage, tLM/STb6
ET\rd5Po
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int everyPage, int totalPage, RM#.-gW
int currentPage, int beginIndex){ +Oc |Oo
this.hasPrePage = hasPrePage; \:E=B1
this.hasNextPage = hasNextPage; OhTd>~R`<
this.everyPage = everyPage; GP_%.fO\M
this.totalPage = totalPage; U[NQ"
this.currentPage = currentPage; __[bKd.
this.beginIndex = beginIndex; _m3#g1m{
} % E8s>D
V@\A<q%jTs
/** O[z-K K<
* @return 3#Xv))w1
* Returns the beginIndex. #xt-65^
*/ ltOsl-OpR
publicint getBeginIndex(){ *yN#q>1
return beginIndex; IQ5'4zQg=
} _A6e|(.ll
}ssL;q
/** F,@uYMQs
* @param beginIndex pI}6AAs}Z
* The beginIndex to set. OK%d1M^8j
*/ vGD D
publicvoid setBeginIndex(int beginIndex){ FH7l6b,^
this.beginIndex = beginIndex; lD,;xuQ
} TCK<IZKLqK
3($tD*!o
/** ]~\%ANoi
* @return ,AyQCUz{*?
* Returns the currentPage. ;:8SN&).
*/ HA~BXxa/
publicint getCurrentPage(){ ~--F?KUnL
return currentPage; 4AYW'j C
} sNsWz.DLT#
M~5Ja0N~
/** $pj;CoPm
* @param currentPage eV(
* The currentPage to set. 4*?i!<N9
*/ a4Y43 n
publicvoid setCurrentPage(int currentPage){ Og2G0sWRf
this.currentPage = currentPage; }nMp.7b
} d+%Rg\v
t ]P^6jw'
/** e?fA3Fug
* @return ML:H\
* Returns the everyPage. APq Yf<W
*/ (gb
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publicint getEveryPage(){ W!)B%.Q
return everyPage; "/{H=X3was
} =&y6mQ
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/** }=s64O9j
* @param everyPage
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* The everyPage to set. b.QL\$a
&
*/ <O4W!UVg
publicvoid setEveryPage(int everyPage){ uw{K&Hxw
this.everyPage = everyPage; B=|m._OL]n
} U\(T<WX,
3EA`]&d>
/** h8:5[;e
* @return EOG&Xa
* Returns the hasNextPage. |I s"ov
*/ +H
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publicboolean getHasNextPage(){ Us4#O&
return hasNextPage; o=Ia{@
} $zJ!L
!Er)|YP
/** C$^WW}S
* @param hasNextPage Tr"Bz!
* The hasNextPage to set. KWH:tFL.
*/ 8P*wt'Q$
publicvoid setHasNextPage(boolean hasNextPage){ TH? wXd\
this.hasNextPage = hasNextPage; C*Wyw]:r
} AQgm]ex<
t`'5|
/** mZ#h p}\.
* @return b$=c(@]
* Returns the hasPrePage. -02.n}u>
*/ !">EZX
publicboolean getHasPrePage(){ j&Y{
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return hasPrePage; )q>q]eHz
} .t$1B5
"T' QbK0
/** [ Ru( H
* @param hasPrePage D[<~^R;*
* The hasPrePage to set. epxbTJfc
*/ a5uBQ?
publicvoid setHasPrePage(boolean hasPrePage){ ]w~ECP(ap
this.hasPrePage = hasPrePage; [}Y_O*C !
} 1NQU96
#oxP,LR
/** "eR-(c1
* @return Returns the totalPage. !t|2&R$IQ
* MbyV_A`r_
*/ zC>zkFT>H
publicint getTotalPage(){ k1Sr7|
return totalPage; {1[f9uPS
} / e]R0NI
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/** _E4_k%8y
* @param totalPage ;6{{hc4
* The totalPage to set. s1
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*/ D@`"99z
publicvoid setTotalPage(int totalPage){ .*nr3dY
this.totalPage = totalPage; ivJTE
} UaM&/K9
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} UOkVU*{
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osI0m7ws:
QHw{@*
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 bipA{VU
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个PageUtil,负责对Page对象进行构造: xH{V.n&v
java代码: QA#
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/*Created on 2005-4-14*/ z_A34@a
package org.flyware.util.page; `k~w
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import org.apache.commons.logging.Log; `{'h+v`
import org.apache.commons.logging.LogFactory; :}[D;cx
9 N9Q#o$!.
/** F{F SmUxzK
* @author Joa JwcC9
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* RgLk AHA
*/ JeU1r-i
publicclass PageUtil { _QiGrC
XA-,
privatestaticfinal Log logger = LogFactory.getLog "In$|A\?E
<gx"p#JbZ
(PageUtil.class); g/`z.?
-59;Zn/
/** ; 8u5
* Use the origin page to create a new page uAv'%/
* @param page [_zoJ
* @param totalRecords o`7B@]
* @return `&g1`vg
*/ Cp^%;(@
publicstatic Page createPage(Page page, int iK9#{1BpML
og8"#%
totalRecords){ +3o
4KB}
return createPage(page.getEveryPage(), !l~3K(&4
i2n66d
page.getCurrentPage(), totalRecords); +M.!_2t$2
} 'T*h0xX
~0Xx]
/** zmh5x{US1
* the basic page utils not including exception <x\I*%(
?CZ*MMV
handler KhPDkD-
* @param everyPage QS2~}{v
* @param currentPage ]hlYmT
* @param totalRecords }R)A%FKi@
* @return page 0j2M< W#
*/ lv\^@9r
publicstatic Page createPage(int everyPage, int 'cvc\=p
6|ENDd[
currentPage, int totalRecords){ l&6+ykQ
everyPage = getEveryPage(everyPage); tk'3Q 1L
currentPage = getCurrentPage(currentPage); }d 16xp
int beginIndex = getBeginIndex(everyPage, 0A.9<&Lod
o3>D~9
currentPage); CUa`#
int totalPage = getTotalPage(everyPage, 6cbIs_g
a~O](/+p;
totalRecords); CB>O%m[1
boolean hasNextPage = hasNextPage(currentPage, DK }1T
02~GT_)$^
totalPage); N="H
06t
boolean hasPrePage = hasPrePage(currentPage); MI*@^{G
T.iVY5^<
returnnew Page(hasPrePage, hasNextPage, BxHfL8$1[$
everyPage, totalPage, mY/x|)MmM
currentPage, #GA6vJ4^s
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mHq
beginIndex); ~6Df~uN
} vAo|o*
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privatestaticint getEveryPage(int everyPage){
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return everyPage == 0 ? 10 : everyPage; .DZ8kKY
} y2NVx!?n
7g&<ZZo
privatestaticint getCurrentPage(int currentPage){ 0}
Lx}2
return currentPage == 0 ? 1 : currentPage; >d#Ks0\&
} 6;hZHe 'W
+B-;.]L
T
privatestaticint getBeginIndex(int everyPage, int XyytO;XM-
G~`nLC^Y
currentPage){ 0vi\o`**Mj
return(currentPage - 1) * everyPage; Y<9Lqc.i
} 4z^5|$?_ta
xgv&M:%D-
privatestaticint getTotalPage(int everyPage, int Gt5'-Hyo
}[8Nr+y
totalRecords){ -
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int totalPage = 0; IL N0/eH
7P7d[KP<
if(totalRecords % everyPage == 0) %eLf6|1x
totalPage = totalRecords / everyPage; .T }q"
else ,?Nc\Q<:
totalPage = totalRecords / everyPage + 1 ; 5sK1rDN
:} 9Lb)Yp
return totalPage; TrC :CL
} 7T-}oNaJA\
Wf!<Qot|R#
privatestaticboolean hasPrePage(int currentPage){ d@,3P)?
return currentPage == 1 ? false : true; &P3ep[]j
} Y"Y+U`Qt
Zlf)
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privatestaticboolean hasNextPage(int currentPage, LFV',1+
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int totalPage){ QX&1BKqWn
return currentPage == totalPage || totalPage == !ie'}|c
e-/+e64Q@
0 ? false : true; #ysSfM6
} /\|AHM
e x`mu E
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} >;zQ.2*
g$$j:U*-
!BikqTM
b<?A
? {vY3~
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。 Ve\=By-a|
1!`B8y)
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 4Hcds9y9
mzh7E[S_,i
做法如下: [_,Gk]F=
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 z'd*z[L~
NamO5(1C
的信息,和一个结果集List: dqo&3^px
java代码: A%dI8Z,
Th[Gu8b3
v$i[dZSN[
/*Created on 2005-6-13*/ "I`g(q#Uo
package com.adt.bo; wUBug
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import java.util.List; q&N1| f7
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import org.flyware.util.page.Page; li
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p^ojhrr
/** '}eA2Q>BV
* @author Joa S((\KL,
*/ yQM<(;\O
publicclass Result { Da8{==
~*,e &I
private Page page; =hse2f
KOM]7%ys1H
private List content; Fi*j}4F1
H(k-jAO,
/** Kx@;LRY#
* The default constructor 1l*O;J9By
*/ jVhfpS[
public Result(){ cKbsf^R[e
super(); eLc@w<yB
}
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/** / %:%la%
* The constructor using fields 5EqC.g.
* .8K ~ h
* @param page ~\~K,v
* @param content Udbz;^(
*/ F;@A2WD
public Result(Page page, List content){ 6V@?/B
this.page = page; ?}g#Mc
this.content = content; )]~;Ac^x
} ~GZpAPg*
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/** N)H
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* @return Returns the content. ek3,ss3
*/ ^w*$qzESy
publicList getContent(){ Zc Y* TGx
return content; 21\t2<"
} =u^{Jvl[
Sd0y=!Pj=
/** v%6mH6V
* @return Returns the page. wmf#3"n
*/ |zaYIVE[
public Page getPage(){ e//q`?ys
return page; E:C-k^/[Y
} lq%6~va
gvx
{;e
/** GE0,d
* @param content etHkyF
* The content to set. A_vf3 *q
*/ NtnKS@Ht
public void setContent(List content){ IhYTK%^96
this.content = content; oA1d8*i^E
} 6%&RDrn
U;Ne"Jh
/** Q:4euhz*
* @param page qr~=S
* The page to set. MJ+]\(
*/ Q[M?LNE`
publicvoid setPage(Page page){ PN&;3z Z
this.page = page; IT~pp_6g
} NgXV|) L
} 8aSH0dX
T)QT_ST.9
i[wEH1jR
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~} N
2. 编写业务逻辑接口,并实现它(UserManager, F;&a=R!.
`vijd(a?v
UserManagerImpl) ~Uet)y<
java代码: oy)'wb~
a.5^zq7#!
ZTwCFn
/*Created on 2005-7-15*/ D\H)uV`
package com.adt.service; a &89K
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import net.sf.hibernate.HibernateException; qU) pBA
Q]u*Oels
import org.flyware.util.page.Page; #ir~v>J||
jcT
import com.adt.bo.Result; JTxHM?/G
Td`0;R'<}c
/** dGrm1w
* @author Joa [MkXQwY
*/ HP
/@ _qk
publicinterface UserManager { [7:(e/&
'#fwNbD
public Result listUser(Page page)throws mJ3|UClPS
<CJ`A5N
HibernateException; sBo|e]m#
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} zeZ}P>C
r^$4]@Wn
F5#P{zk|
9Fkzt=(E~
:&/b}b!)AX
java代码: nDhD"rc
]} +
NT
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/*Created on 2005-7-15*/ #!WD1a?L
package com.adt.service.impl; AxOn~fZ!
hu
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import java.util.List; {I2qnTN_a
6IVa(;
import net.sf.hibernate.HibernateException; \Q5Jg
=nmvG%.hd
import org.flyware.util.page.Page; O'G,
import org.flyware.util.page.PageUtil; ezC2E/#
: Nf-}"
import com.adt.bo.Result; ?1f(@
import com.adt.dao.UserDAO; Zu$30&U
import com.adt.exception.ObjectNotFoundException; j;|rI`67~
import com.adt.service.UserManager; @\=%M^bx
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/** f_&bwfbo
* @author Joa 8u401ddg
*/ l9%oKJ;
publicclass UserManagerImpl implements UserManager { qOV6Kh)
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private UserDAO userDAO; jNIZ!/K
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/** {=Y.Z1E:
* @param userDAO The userDAO to set. Ny.s
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*/ F`3J=AJOJ
publicvoid setUserDAO(UserDAO userDAO){ L0Fhjbc
this.userDAO = userDAO; (oYM}#Q
} V=@M!;'<
:d7tzYT ^
/* (non-Javadoc) M]+FTz
* @see com.adt.service.UserManager#listUser c&Mci"nj0
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(org.flyware.util.page.Page) <Q4yN!6
*/ d `z),A=
public Result listUser(Page page)throws O=HT3gp&
.[Z<r>
HibernateException, ObjectNotFoundException { Felu`@b
int totalRecords = userDAO.getUserCount(); 9Okb)K95
if(totalRecords == 0) oWZbfR9R
throw new ObjectNotFoundException BtyBZ8P;e
k-v@sb24_
("userNotExist"); em87`Hj^lo
page = PageUtil.createPage(page, totalRecords); 7,sslf2%K
List users = userDAO.getUserByPage(page); FE)L?
returnnew Result(page, users); (5SN=6O
} G|Du/XYh
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} CywQ
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DL ^}?Ve
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其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 ]"3(UKx
@bN`+DC!<
询,接下来编写UserDAO的代码: H$
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3. UserDAO 和 UserDAOImpl: v Kzq7E
java代码: O6LuFT.
*g}(qjl<
| %Dh
/*Created on 2005-7-15*/ uqhNi!;
package com.adt.dao; g|W|>`>
(W<n<sl:-
import java.util.List; p+O2:
6wzTX8
import org.flyware.util.page.Page; X]?qns7
6$}hb|j
import net.sf.hibernate.HibernateException; 1k5o?'3&
YGBVGpE9
/** 3w=OvafT:
* @author Joa 7R 40t3
*/ tFvc~zz9
publicinterface UserDAO extends BaseDAO { Zhl}X!:c?\
Zd/ACZ[
publicList getUserByName(String name)throws cG|ihG5)
MY zyg
HibernateException; N5ityJIgQ
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publicint getUserCount()throws HibernateException; 0L
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publicList getUserByPage(Page page)throws <z3:*=!
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HibernateException; 1D42+cy
}";\8
} &ACM:&Ob
N 798("
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T@[(FVA N
java代码: OY'490
sLE@Cm]k
*&b~cyC
/*Created on 2005-7-15*/ aZ%
package com.adt.dao.impl; o2cZ
k%iZ..
import java.util.List; C:77~f-+rQ
9/rX%
import org.flyware.util.page.Page; X\?e=rUfn
-5Qsc/s&
import net.sf.hibernate.HibernateException; (UDR=7w)
import net.sf.hibernate.Query; $7{|
;><9R@0
import com.adt.dao.UserDAO; 6Q&R,"!$p
U*G9 fpVy
/** [vuqH:Ln
* @author Joa K)|#FRPM u
*/ 6{rH|Z
public class UserDAOImpl extends BaseDAOHibernateImpl $?^#G8J
?@"B:#l
implements UserDAO { #GBe=tm\K
8~QEJW$
/* (non-Javadoc) #P,mZ}G\
* @see com.adt.dao.UserDAO#getUserByName *R17 KMS
2QUZAV\ Y
(java.lang.String) eGrC0[SH
*/ >gAq/'.Q
publicList getUserByName(String name)throws KmoPFlw
Xg|_
HibernateException { s2t'jIB
String querySentence = "FROM user in class 0ad -4
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com.adt.po.User WHERE user.name=:name"; Gld|w=qr
Query query = getSession().createQuery rs$sAa*f
K252l,;|
(querySentence); $42C4I*E
query.setParameter("name", name); r>N5^
return query.list(); #4. S2m4
} $O*rxQ}
%k8} IBL
/* (non-Javadoc) a9=,P
* @see com.adt.dao.UserDAO#getUserCount() r2A(GUz
*/ c?i=6CdD'
publicint getUserCount()throws HibernateException { 73?ZB+\)0A
int count = 0; ^
q]BCOfJ(
String querySentence = "SELECT count(*) FROM GWZ0!V
Ds|/\cI$%a
user in class com.adt.po.User"; vpOn0([hS
Query query = getSession().createQuery 4&IBNc,sn
j_PICv*6
(querySentence); K'[H`x^
count = ((Integer)query.iterate().next Fx']kn9
^E&':6(
()).intValue(); FHVZ/ e
return count; @,i_
KN6C
} o/EA%q1
8UArl3
/* (non-Javadoc) ,5" vzGLJ
* @see com.adt.dao.UserDAO#getUserByPage = :rR%L!a
IS0RhtGy/
(org.flyware.util.page.Page) ~c7}eTJd"
*/ S_cba(0-|\
publicList getUserByPage(Page page)throws 5?),6o);
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HibernateException { @; ayl
String querySentence = "FROM user in class w=Xil
V.PbAN
com.adt.po.User"; o0Qy?14T-
Query query = getSession().createQuery $a(EF
6
o.DT`L8
(querySentence); JFVal#
query.setFirstResult(page.getBeginIndex()) olzP=08aaV
.setMaxResults(page.getEveryPage()); I^'kt[P'FZ
return query.list();
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} SS@F:5),
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} |,F/_
)P\Vd #
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6dO )]
o
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至此,一个完整的分页程序完成。前台的只需要调用 Eh;SH^&6
!h&A^sAc
userManager.listUser(page)即可得到一个Page对象和结果集对象 Ex35
Wbc*x
的综合体,而传入的参数page对象则可以由前台传入,如果用 /X)fWO S6
*Got
webwork,甚至可以直接在配置文件中指定。 e$|g
9 aT#7B
下面给出一个webwork调用示例: s
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java代码: AZ cWf8
$aTZC>R
/7X:=~m
/*Created on 2005-6-17*/ NZ`W`#{
package com.adt.action.user; Z++JmD1J
/)?]vKMiI
import java.util.List; 9|O#+_=+v
hRZ9[F[[
import org.apache.commons.logging.Log; rkW*C'2fz
import org.apache.commons.logging.LogFactory; @~Z:W<X
import org.flyware.util.page.Page; %\ -u&