Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 L}{3_/t
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 .F$}a%
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 tf 7HhOCYX
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 ppn 8
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分页支持类: xdbzpU
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java代码: :|kO}NGM
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package com.javaeye.common.util; a]fFR~OY
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import java.util.List; f_O|
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publicclass PaginationSupport { bC+ZR{M
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publicfinalstaticint PAGESIZE = 30; ($`IHKF1.l
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privateint pageSize = PAGESIZE; 1@{ov!YB]
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privateList items; w^8Q~3|7
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privateint totalCount; USEmD5 q
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privateint[] indexes = newint[0]; VtzZ1/JE
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privateint startIndex = 0; ~SBW`=aP}
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public PaginationSupport(List items, int [r>hKZU2
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totalCount){ <-N eusx%
setPageSize(PAGESIZE); gQik>gFr
setTotalCount(totalCount); mY"Dw^)
setItems(items); 5!9y nIC+>
setStartIndex(0); i#YDdz
} gNxv.6Pp=
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public PaginationSupport(List items, int (9( xJ)
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totalCount, int startIndex){ QE"$Lc)
setPageSize(PAGESIZE); ,9^ 5
setTotalCount(totalCount); W:n\,P
setItems(items); FEhBhv|m
setStartIndex(startIndex); V9<E`C
} 74
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public PaginationSupport(List items, int \I i#R
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totalCount, int pageSize, int startIndex){ ?~.9:93
setPageSize(pageSize); _6.@^\;
setTotalCount(totalCount); (:~_#BA
setItems(items); 7Y~5gn
setStartIndex(startIndex); 6T~+vT
} |1ry*~
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publicList getItems(){ BSy4
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return items; `,pBOh|'
} .6n|hYe
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publicvoid setItems(List items){ eWYet2!Q
this.items = items; yT3K 2A
} Qh3+4nLFtb
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publicint getPageSize(){ ocW`sE?EED
return pageSize; 6"?#s/fk
} Q!~1Xc0S`p
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publicvoid setPageSize(int pageSize){ Tz&cm=
this.pageSize = pageSize; ZQz;EV!
} .*EP$pc
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publicint getTotalCount(){ 5.0;xz}#y
return totalCount; <0`"vPU
} ~U?vB((j!
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publicvoid setTotalCount(int totalCount){ TKw>eGe
if(totalCount > 0){ QBoX3w=
this.totalCount = totalCount; `b@"GOr
int count = totalCount / z9#jXC#OdN
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pageSize; 84Hm
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if(totalCount % pageSize > 0) jS/$o ?
count++; *OE>gg&?Nh
indexes = newint[count]; Q%GLT,f1.
for(int i = 0; i < count; i++){ \BsvUGd
indexes = pageSize * DUm/0q&
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i; m}
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} H~*[v"
}else{ ^T@-yys
this.totalCount = 0; ?~Vev D
} HoM8V"8B
} M[T!AO-S$
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publicint[] getIndexes(){ t;ga>^NA"
return indexes; ]Otl(\v(h
} KQqQ@D&n
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publicvoid setIndexes(int[] indexes){ }fxH>79g
this.indexes = indexes; s*}d`"YvH
}
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publicint getStartIndex(){ 8c$IsvJg
return startIndex; %nc+VL4
} ` }Hnj*
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publicvoid setStartIndex(int startIndex){ DFjkp;`1
if(totalCount <= 0) }#u}{
this.startIndex = 0; q+G1#5
elseif(startIndex >= totalCount) (/Y
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this.startIndex = indexes pK1(AV'L
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[indexes.length - 1]; !!K=v7M
elseif(startIndex < 0) `RzM)ILl
this.startIndex = 0; wYawG$@_
else{ (c*Dvpo1
this.startIndex = indexes ,zyrBO0 Eq
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[startIndex / pageSize]; n<$I, IRE
} 6qA{l_V
} n*xNMw1x"T
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publicint getNextIndex(){ Gsh2
int nextIndex = getStartIndex() + U)o8Tr
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pageSize; @<sP1`1
if(nextIndex >= totalCount) 5astv:p,P
return getStartIndex(); K^vMIo h
else sR0nY8@F
return nextIndex; Stw6%T-
} U5PCj ]-Xt
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publicint getPreviousIndex(){ Y+7v~/K=
int previousIndex = getStartIndex() - 5~?
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pageSize; 0nuFWV
if(previousIndex < 0) =w5w=qB
return0; 3WVHI$A9
else MG@19R2s
return previousIndex; `jkn*:m
} _B[(/wY
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} ]7O?c=
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抽象业务类 b +_E)4
java代码: lo#,zd~
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/** '37b[~k4
* Created on 2005-7-12 ~eP2PG
*/ l]Sui_+ZU
package com.javaeye.common.business; Kna'5L5"
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import java.io.Serializable; ^s*} 0
import java.util.List; hd B[H8Q
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import org.hibernate.Criteria; uI[*uAR
import org.hibernate.HibernateException; !Z ZA I_N
import org.hibernate.Session; uwka 2aSS
import org.hibernate.criterion.DetachedCriteria; bW]+Og
import org.hibernate.criterion.Projections; ,d+mT^jN
import J Nz0!wi
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org.springframework.orm.hibernate3.HibernateCallback; =!X4j3Cv
import QFYy$T+W
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org.springframework.orm.hibernate3.support.HibernateDaoS c"ztrKQQ
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upport; Dhoj|lc
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import com.javaeye.common.util.PaginationSupport; ;GSJnV
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public abstract class AbstractManager extends P>-,6a>
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HibernateDaoSupport { M6sDtL9l
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privateboolean cacheQueries = false; jxaoQeac
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privateString queryCacheRegion; t^5_;sJQ
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publicvoid setCacheQueries(boolean E6k&r}
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cacheQueries){ Uj)]nJX
this.cacheQueries = cacheQueries; =jt_1L4
} VHCzlg
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publicvoid setQueryCacheRegion(String rR~X>+K
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queryCacheRegion){ N~jQ!y
this.queryCacheRegion = 5QJL0fc
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queryCacheRegion; [udV }
} 4
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publicvoid save(finalObject entity){ em}Qv3*#
getHibernateTemplate().save(entity); {2^@jD
} GNc|)$
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publicvoid persist(finalObject entity){ I;H9<o5
getHibernateTemplate().save(entity); {1|7N
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} |"w<CKlQ
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publicvoid update(finalObject entity){ )fc"])&8
getHibernateTemplate().update(entity); f"N3;,Oc
} FSs$ ]
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publicvoid delete(finalObject entity){ z
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getHibernateTemplate().delete(entity); PSS/JFZ^
} z,YUguc|
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publicObject load(finalClass entity, XF$]KAL0
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finalSerializable id){ yuDd%
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return getHibernateTemplate().load qXhf?x
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(entity, id); arVf"3a
} os^SD&hL
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publicObject get(finalClass entity, Ia:puks=
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finalSerializable id){ n4T2'e
return getHibernateTemplate().get {eN{Zh5"
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(entity, id); bu]Se6%}
} 4Olv8nOe<
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publicList findAll(finalClass entity){ J*KBG2+13
return getHibernateTemplate().find("from 4eL54).1O
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" + entity.getName()); hs_|nr0;[
} ,xe@G)a
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publicList findByNamedQuery(finalString ur,"K'w
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namedQuery){ X8n/XG ~_
return getHibernateTemplate | 4oM+n;Y
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().findByNamedQuery(namedQuery); NF(IF.8G
} }rA+W-7
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publicList findByNamedQuery(finalString query, 9iddanQA
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finalObject parameter){ EJ;0ypbG
return getHibernateTemplate '7LJuMp$#
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().findByNamedQuery(query, parameter); ~eOj:H
} Dw/Gha/
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publicList findByNamedQuery(finalString query, 5OW8G][
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finalObject[] parameters){ y_4krY|Zx
return getHibernateTemplate ji)4WG/1
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().findByNamedQuery(query, parameters); ivUsMhx>S,
} pM'IQ3N
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publicList find(finalString query){ 3auJ^B}
return getHibernateTemplate().find pg}+lYGP
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(query); ,dj*p,J
} cYWy\+
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publicList find(finalString query, finalObject :Nj`_2
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parameter){ |RAQ% VXm
return getHibernateTemplate().find Wt)SdF=U/
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(query, parameter); "X{aS}
} NzeI/f3K5
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public PaginationSupport findPageByCriteria \abAPo
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(final DetachedCriteria detachedCriteria){ KIAe36.~
return findPageByCriteria 97]a-)SA
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); !G"9xrr1
} 0n<(*bfW
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public PaginationSupport findPageByCriteria Q+!0)pG5#
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(final DetachedCriteria detachedCriteria, finalint e:GgA
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startIndex){ >\?z37:T
return findPageByCriteria h5&/hBN
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(detachedCriteria, PaginationSupport.PAGESIZE, cZDxsd]
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startIndex); @ kJ0K
} M q^|M~
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public PaginationSupport findPageByCriteria y^mWG1"O
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(final DetachedCriteria detachedCriteria, finalint XDpfpJ,z"}
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pageSize, mFqSD
finalint startIndex){ +9CEC1-l
return(PaginationSupport) Cdp]Nv6
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getHibernateTemplate().execute(new HibernateCallback(){ Ic[}V0dk
publicObject doInHibernate E\]OySC%C$
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(Session session)throws HibernateException { lX98"}
Criteria criteria = -,~;qSs
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detachedCriteria.getExecutableCriteria(session); vix&E`0yD
int totalCount = [!1)mR
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((Integer) criteria.setProjection(Projections.rowCount M11"<3]D
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()).uniqueResult()).intValue(); *2JH_Cj`
criteria.setProjection o {=qC: b
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(null); kAZC"qM%i
List items = R*s* +I
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criteria.setFirstResult(startIndex).setMaxResults (;;J,*NP
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(pageSize).list(); .MDYGWKt
PaginationSupport ps = 7"ylN"syZ
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new PaginationSupport(items, totalCount, pageSize, AIuMX4nb
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startIndex); 5cD
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return ps; h [nH<m
} r1i$D
}, true); #/OUGeJ
} v"z(JF
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public List findAllByCriteria(final %mY|
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DetachedCriteria detachedCriteria){ }qc#lz
return(List) getHibernateTemplate f>.4-a?
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().execute(new HibernateCallback(){ F\>oxttS1
publicObject doInHibernate oi7
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(Session session)throws HibernateException { blJIto'
Criteria criteria = MV%Xhfk
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detachedCriteria.getExecutableCriteria(session); {mNdL J
return criteria.list(); "XCU'_k=
} \r)%R5_CQ
}, true); K!GUv{fp
} A2Q[%A
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public int getCountByCriteria(final YzVN2f!n
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DetachedCriteria detachedCriteria){ QQ@9_[N
Integer count = (Integer) *5e<\{!
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getHibernateTemplate().execute(new HibernateCallback(){ "X`RQ6~]>
publicObject doInHibernate BsKbn@'uC
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(Session session)throws HibernateException { t) LU\!
Criteria criteria = 0z/h+,
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detachedCriteria.getExecutableCriteria(session); 1Yud~[c
return cn$5:%IK
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criteria.setProjection(Projections.rowCount C1 W>/?XC
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()).uniqueResult(); !~WZ_z
} *2`:VFEV
}, true); h%'
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return count.intValue(); ?4,@,
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} 5? Wg%@
} s}wO7Df=+
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用户在web层构造查询条件detachedCriteria,和可选的 TM0b-W (H
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 yr5NRs
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PaginationSupport的实例ps。 VUp. j
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ps.getItems()得到已分页好的结果集 Mq@}snp"S
ps.getIndexes()得到分页索引的数组 ?1CJf>B >
ps.getTotalCount()得到总结果数 `|Ey)@w
ps.getStartIndex()当前分页索引 !nwbj21%
ps.getNextIndex()下一页索引 SZ/(\kQ6
ps.getPreviousIndex()上一页索引 \*uugw,\y
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 w,Q)@]_
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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 k d+l k:
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一下代码重构了。 X@!X6j
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我把原本我的做法也提供出来供大家讨论吧: (etUEb^}T
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首先,为了实现分页查询,我封装了一个Page类: };rm3;~ eg
java代码: )6=gooe]
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/*Created on 2005-4-14*/ KSc~GP_
package org.flyware.util.page; j{)~QD ?
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/** Y''6NGf
* @author Joa a%E8(ms37y
* M6_-f ;.
*/ r{S=Z~J
publicclass Page { =U NT.]
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/** imply if the page has previous page */ Jn*Nao_)
privateboolean hasPrePage; 9:-T@u
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/** imply if the page has next page */ Z(HZB
privateboolean hasNextPage; D-pX<0-y
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/** the number of every page */ E_3r[1l
privateint everyPage; /'4Q{8.a
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/** the total page number */ yp p 4L|R
privateint totalPage; akC>s8tqlA
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/** the number of current page */ b+Vi3V
privateint currentPage; @h#Xix7
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/** the begin index of the records by the current 3u_oRs
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query */ Fc'[+L--Q
privateint beginIndex; 4UD' %}>y
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/** The default constructor */ W`x)=y]Z
public Page(){ 1~@|eWr|
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} +9zA^0
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/** construct the page by everyPage q5p e~
* @param everyPage ,dcg?48
* */ )b92yP{
public Page(int everyPage){ EeB3 }
this.everyPage = everyPage; $)*xC!@6X
} '#H")i
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/** The whole constructor */ <tuS,.
public Page(boolean hasPrePage, boolean hasNextPage, lsY `c"NW>
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int everyPage, int totalPage, ~^7r?<aKc
int currentPage, int beginIndex){ JYV\oV{
this.hasPrePage = hasPrePage; wAh#
this.hasNextPage = hasNextPage; zQc"bcif5(
this.everyPage = everyPage; k 4B_W
this.totalPage = totalPage; OQFi.8
this.currentPage = currentPage; F;kvH
this.beginIndex = beginIndex; KjOi(YUnq7
} @9vvR7{P
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/** zMGzReJ
* @return >vVw!.fJ
* Returns the beginIndex. -:SIS`0s
*/ El
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publicint getBeginIndex(){ 8l23%iWxe
return beginIndex; JZ=5Bpw
} {ma;G[!
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/** g1@wf
* @param beginIndex bS rZ{l
* The beginIndex to set. j Nc<~{/
*/ GNU;jSh5
publicvoid setBeginIndex(int beginIndex){ s;1e0n
this.beginIndex = beginIndex; z0Xa_w=
} m*oc)x7'
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/** G),db%,X2
* @return Yy
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* Returns the currentPage. Hk u=pr3Gn
*/ 4RQ5(YTTuR
publicint getCurrentPage(){ Y<Q\d[3^F
return currentPage; qq;b~ 3kW
} zvr\36
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/** (Es{l a G
* @param currentPage Rla4L`X;
* The currentPage to set. "={L+di:M
*/ /9_#U#vhY
publicvoid setCurrentPage(int currentPage){ 2B` 8eb
this.currentPage = currentPage; \r;F2C0*i
} "}zda*z8
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/** bUs|t
* @return t5)J;0/
* Returns the everyPage. TyOH`5D
*/ #DUh(:E'`
publicint getEveryPage(){ |C D}<r(N
return everyPage; _M5Xk? e=
} ;|TT(P:d
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/** O<GF>
* @param everyPage O
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* The everyPage to set. Km*<Kfcz
*/ lIh[|]
publicvoid setEveryPage(int everyPage){ ]yLhJ_^
this.everyPage = everyPage; 9=$!gC)
} bk3Unreh
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/** o.^y1mH'
* @return oT3Y!Y3=<
* Returns the hasNextPage. #C\4/g?=,
*/ Jqru AW<
publicboolean getHasNextPage(){ @!\K>G >9[
return hasNextPage; -0 0}if7
} !kXeO6X@m
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/** <zfKC
* @param hasNextPage F_ljx
* The hasNextPage to set. (M`|'o!
*/ Ro r2qDF
publicvoid setHasNextPage(boolean hasNextPage){ LC-)'Z9}5
this.hasNextPage = hasNextPage; (vQ+e
} <v$QM;Ff
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/** Y8ehmz|g]J
* @return H06Bj(Y!
* Returns the hasPrePage. G$5m$\K
*/ ]W)
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publicboolean getHasPrePage(){ \+Y!ILOI
return hasPrePage; m;/i<:`
} FFe)e>bH
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/** rAXX}"l6s
* @param hasPrePage |Td5l?
* The hasPrePage to set. FC}oL"kk
*/ >n!ni(
publicvoid setHasPrePage(boolean hasPrePage){ ~HDdO3
this.hasPrePage = hasPrePage; Np)aS[9W
} dWR1cvB(wY
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/** i&K