Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Q{[@`bZB
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 pr$~8e=c
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 #Mg lHQO+
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 3?@?-q2g
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分页支持类: H'Ln
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java代码: }a ^|L"
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package com.javaeye.common.util; x/xb1"
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import java.util.List; 'y.JcS!|
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publicclass PaginationSupport { {OCJ(^8i
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publicfinalstaticint PAGESIZE = 30; 3b@VY'P
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privateint pageSize = PAGESIZE; 1A^1@^{m'
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privateList items; NF mc>0-
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privateint totalCount; C U$)QH{
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privateint[] indexes = newint[0]; q$T8bh,2
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privateint startIndex = 0; NI.`mc6Xd
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public PaginationSupport(List items, int qp&4 1
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totalCount){ Pw{"_g
setPageSize(PAGESIZE); krjN7&
setTotalCount(totalCount); @1g&Z}L
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setItems(items); SO3cY#i
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setStartIndex(0); +xp*]a
} n P1GW6Pu
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public PaginationSupport(List items, int Y@%`ZPJ
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totalCount, int startIndex){ Za%LAyT_s
setPageSize(PAGESIZE); 6,+nRiZ
setTotalCount(totalCount); B |&F%P0:
setItems(items); a$$ Wt<&Y
setStartIndex(startIndex); QPs:R hV7
} c`jDW S
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public PaginationSupport(List items, int b#a@rh
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totalCount, int pageSize, int startIndex){ /2XW
setPageSize(pageSize); o @KW/RN"
setTotalCount(totalCount); LuS+_|]x
setItems(items); k ZxW"2
setStartIndex(startIndex); k>5 O`Y:
} ;LQ9#M?
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publicList getItems(){ "!KpXBc,>
return items; 56{I`QjX
} 3m=2x5{L
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publicvoid setItems(List items){ 4pPI'd&/7
this.items = items; d!V$Y}n
} %4,?kh``D
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publicint getPageSize(){ HnU Et/
return pageSize; ;#/0b{XFj
} S
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publicvoid setPageSize(int pageSize){ JJnYOau
this.pageSize = pageSize; jg_n 7
} @Y-TOCadT
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publicint getTotalCount(){ 2|{V,!/cvG
return totalCount; l r~gG3
} N wtg%;
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publicvoid setTotalCount(int totalCount){ Wi$dZOcSJ
if(totalCount > 0){ FjFwvO_.
this.totalCount = totalCount; Fo}7hab
int count = totalCount / _Y!sVJ){,c
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pageSize;
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if(totalCount % pageSize > 0) ST;t,
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count++; &&7r+.Y
indexes = newint[count]; Oy_c
for(int i = 0; i < count; i++){ j@| `f((4
indexes = pageSize * Eju~}:Lo
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} !w2gGy:I>
}else{ f /y`
this.totalCount = 0; DWm SC}{.
} n:4uA`Vg
} Z
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publicint[] getIndexes(){ _0(7GE13p
return indexes; b{5K2k&,
} Tlodn7%",
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publicvoid setIndexes(int[] indexes){ ]'h; {;ug
this.indexes = indexes; 6rX_-Mm6w
} }}T,W.#%u
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publicint getStartIndex(){ W?z#pV+jt
return startIndex; H%}IuHhN)
} Y*LaBxt Q
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publicvoid setStartIndex(int startIndex){ nE|@IGH
if(totalCount <= 0) Em^(
this.startIndex = 0; yL1CZ_
elseif(startIndex >= totalCount) 2]WE({P
this.startIndex = indexes mT.e>/pa
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[indexes.length - 1]; [j9E pi(
elseif(startIndex < 0) 0KvVw rWJ
this.startIndex = 0; ,1UZv>}S
else{ Qa`hR
this.startIndex = indexes ^b-18 ~s
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[startIndex / pageSize]; %XTA;lrz
} <@uOCRbV
} la^
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publicint getNextIndex(){ ]}PV"|#K{c
int nextIndex = getStartIndex() + H0*,8i5I
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pageSize; JPx7EEkZR4
if(nextIndex >= totalCount) ;#k-)m%
return getStartIndex(); q/gB<p9
else G/?~\
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return nextIndex; <{J5W6
} " I+p
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publicint getPreviousIndex(){ GWP dv
int previousIndex = getStartIndex() - p>*i$
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pageSize; Re=WfG
if(previousIndex < 0) q4k@l
return0; P0GeZ02]
else ,FQK;BU!lh
return previousIndex; NAr1[{^E,
} d&(_|xq#
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} Mz=!w]qDH
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抽象业务类 l!~
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java代码: $2#7D*
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/** 0$vj!-Mb^j
* Created on 2005-7-12 E~hzh /,34
*/ slW3qRT\k
package com.javaeye.common.business; T-" I9kM
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import java.io.Serializable; ]MTbW=*}ED
import java.util.List; q/&y*)&'O
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import org.hibernate.Criteria; USPTpjt8R
import org.hibernate.HibernateException; ^ 4hO8
import org.hibernate.Session; k#JQxLy#
import org.hibernate.criterion.DetachedCriteria; XvGA|Ekf<
import org.hibernate.criterion.Projections; ]!{y
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import K
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org.springframework.orm.hibernate3.HibernateCallback; -X1X)0v$
import n!ok?=(kQ
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org.springframework.orm.hibernate3.support.HibernateDaoS I9y.e++/
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upport; -$a>f4]
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import com.javaeye.common.util.PaginationSupport; HAB#pd9
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public abstract class AbstractManager extends uGJ"!K
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HibernateDaoSupport { _YHu96H;
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privateboolean cacheQueries = false; u5E]t9~Pq
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privateString queryCacheRegion; j|(Z#3J
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publicvoid setCacheQueries(boolean z(HaRB3l
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cacheQueries){ 1yqoA*
this.cacheQueries = cacheQueries; ;3ft1
} L/r@ S'
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publicvoid setQueryCacheRegion(String `$RA< 3
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queryCacheRegion){ {I1~-8
this.queryCacheRegion = b= PVIZ
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queryCacheRegion; `)>7)={
} :
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publicvoid save(finalObject entity){ UVuDQ
getHibernateTemplate().save(entity); NeOxpn[
} $17
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publicvoid persist(finalObject entity){ )9j06(<A
getHibernateTemplate().save(entity); -pb&-@Hul
} %!j:fJ()
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publicvoid update(finalObject entity){ woOy*)@
getHibernateTemplate().update(entity); z4U9n'{
} %}Q&1P=
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publicvoid delete(finalObject entity){ ">jwh.
getHibernateTemplate().delete(entity); Jobiq]|>
} L\aBc}
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publicObject load(finalClass entity, l:(Rb-Wy
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finalSerializable id){ 6tjcAsV
return getHibernateTemplate().load :osz
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(entity, id); {U!uVQC'
} R4's7k
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publicObject get(finalClass entity, 3/6/G}s
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finalSerializable id){ y }2F9=
return getHibernateTemplate().get `TKD<&oL
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(entity, id); GUB`|is^
} bha?eN
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publicList findAll(finalClass entity){ vwGeD|Fb5
return getHibernateTemplate().find("from hsLzj\)6
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" + entity.getName()); wo^Sy41bF
} s4= "kT]
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publicList findByNamedQuery(finalString keAcKhj
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namedQuery){ VV_l$E$
return getHibernateTemplate B0UJq./`
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().findByNamedQuery(namedQuery); wdE?SD s
} %'Xk)-+y
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publicList findByNamedQuery(finalString query, Z'v-F^
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finalObject parameter){ 'W. Vr4
return getHibernateTemplate v6a]1B
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().findByNamedQuery(query, parameter); kMxazx1
} tJI,r_
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publicList findByNamedQuery(finalString query, BNGe
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finalObject[] parameters){ *<V^2z$y_
return getHibernateTemplate 3yS
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().findByNamedQuery(query, parameters); 4g
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publicList find(finalString query){ D@YP7
return getHibernateTemplate().find p#8W#t$
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(query); =(r*
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} $6f\uuTU2"
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publicList find(finalString query, finalObject ztM<J+
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parameter){ ;."<m
return getHibernateTemplate().find WT3gNNx|
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(query, parameter); 6iezLG5
} PFSLyV*
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public PaginationSupport findPageByCriteria /!FWuRe^
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(final DetachedCriteria detachedCriteria){ B33$ u3d
return findPageByCriteria *tQk;'/A]
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); &Y>zT9]$K
} 9|r* pK[
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public PaginationSupport findPageByCriteria _uxPx 21g}
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(final DetachedCriteria detachedCriteria, finalint N"5fmY<
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startIndex){ D@Da0
return findPageByCriteria MEZ{j%-a
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(detachedCriteria, PaginationSupport.PAGESIZE, B uQ|~V
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startIndex); O_,O,1
} wGKo.lt
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public PaginationSupport findPageByCriteria eBr4O i
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(final DetachedCriteria detachedCriteria, finalint T.&7sbE_
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pageSize, 3fS}:!sQ
finalint startIndex){ mX# "+X|
return(PaginationSupport) 6Z:YT&,f
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getHibernateTemplate().execute(new HibernateCallback(){ *7gT}O;p 5
publicObject doInHibernate u:P~j
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(Session session)throws HibernateException { !>.vh]8g
Criteria criteria = nS.G~c|
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detachedCriteria.getExecutableCriteria(session); Zc5
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int totalCount = 9M$/=>^
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((Integer) criteria.setProjection(Projections.rowCount 3}Xc71|v
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()).uniqueResult()).intValue(); $g8}^1
criteria.setProjection ^QL 877
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(null); |Fln8wB
List items = C".1+Um
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criteria.setFirstResult(startIndex).setMaxResults 2Oc$+St~8
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(pageSize).list(); I<\
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PaginationSupport ps = Buc_9Kzw<+
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new PaginationSupport(items, totalCount, pageSize, UPh=+s #Q
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startIndex); je%M AgW`
return ps; P~7.sM
} H[&@}v,L
}, true); >IvBUM[Rt
} 'imU`zeo
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public List findAllByCriteria(final *o?i:LE]
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DetachedCriteria detachedCriteria){ pa/9F[
return(List) getHibernateTemplate #gZ|T
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().execute(new HibernateCallback(){ ;IP~Tb]&
publicObject doInHibernate D!3{gV#
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(Session session)throws HibernateException { 5G*II_j
Criteria criteria = :hqZPajE
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detachedCriteria.getExecutableCriteria(session); hl/itSl$
return criteria.list(); a|qsQ'1,;
} MK$Jj"
}, true); q? z>
} <4X?EYaTq
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public int getCountByCriteria(final [?KIN_e#
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DetachedCriteria detachedCriteria){ @z,*K_AKr
Integer count = (Integer) KFhG (
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getHibernateTemplate().execute(new HibernateCallback(){ 4br6$
publicObject doInHibernate U6j/BJT"
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(Session session)throws HibernateException { &d^=siL
Criteria criteria = %$X\"
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detachedCriteria.getExecutableCriteria(session); ^X?D#\
return Ie_I7YJ
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criteria.setProjection(Projections.rowCount YMzBAf
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()).uniqueResult(); Os&1..$Nb
}
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}, true); -Zy)5NB-tZ
return count.intValue(); o:\XRPB
} "sbBe73 m
} Lo`F
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用户在web层构造查询条件detachedCriteria,和可选的 _wu*M
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 2P}I'4C-
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PaginationSupport的实例ps。 SGf9U^ds
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ps.getItems()得到已分页好的结果集 >4)g4~'n!
ps.getIndexes()得到分页索引的数组 :JV\){P
ps.getTotalCount()得到总结果数 .h8M
ps.getStartIndex()当前分页索引 \qq-smcM-
ps.getNextIndex()下一页索引 Q1V2pP+=@
ps.getPreviousIndex()上一页索引 /~hbOs/
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 uBeNXOre
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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 " i`8l.Lc
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一下代码重构了。 9q|7<raS
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我把原本我的做法也提供出来供大家讨论吧: [x_s/"Md;
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首先,为了实现分页查询,我封装了一个Page类: %V_eJC""?
java代码: <