hibernate连接池

1．Hibernate默认连接池 9GZKT{*  
Y(]&j`%  
<?xml version='1.0' encoding='UTF-8'?> \ns#l@B  
#?z1cgCg  
<!DOCTYPE hibernate-configuration L_rKVoKjt  
a,U =irBA  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" %8V/QimHU  
Pl }dA  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 7^~pOFdH  
-vfV;+3  
{-]/r  
<hibernate-configuration> oIM]  
ya'@AJS  
/N ^%=G#  
<session-factory > Dn?P~%  
$W8  
"]nbM}>  
<!?JDBC驱动程序--> ~qiSkG  
F62arDA  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> S{NfU/: dL  
U!-|.N,  
7 '@l?u/6  
<!-- 连接数据库的URL--> 1lNg} !)[K  
9 0[gXj  
<property name="connection.url"> GGs3r;(t  
tp.qh]2c  
jdbc:mysql://localhost:3306/schoolproject '* +]&~b  
wo[W1?|s  
</property> k:w\4Oqd  
q*ZjOqj  
<property name="connection.useUnicode">true</property> {A(=phN  
By@<N [I@  
<property name="connection.characterEncoding">UTF-8</property> +mP3y~|-j  
eP3)
8
QC  
1Ly?XNS  
<!--连接的登录名--> )G6]r$M>o0  
qfY.X&]PU  
<property name="connection.username">root</property> [JGa
3e  
f#l/N%VoBZ  
*4^!e/  
<!?登录密码--> 6!i0ioZzi0  


%xR;8IO  
<property name="connection.password"></property> 3Lq?Y7#KQp  
=ot`V; Q>  
[pmZ0/l  
<!--是否将运行期生成的SQL输出到日志以供调试--> P,O9On  
KW.S)+<H&  
<property name="show_sql">true</property> s&lZxnIjc  
3yXF| yV  
C/[2?[  
<!--指定连接的语言--> OZ_'&CZ  
~R)Km`t  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> "$#x+|PyC  
}d)>pH  
f$k#\=2%  
<!--映射Student这个资源--> )4a&OlEI  
CPGXwM=   
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> e@L'H)w,  
h2KXW}y"4  
6kjBd3  
</session-factory> |J`YFv  
3;j?i<kM  
}_M.-Xm  
</hibernate-configuration> A{;b^IK  
3u7E?*{sH  
?S0VtHQ  
2．C3P0连接配置 ;2}0Hr'|  
8@/]ki`>  
<?xml version='1.0' encoding='UTF-8'?> v^[Ny0c
M  
,KIa+&vJW@  
<!DOCTYPE hibernate-configuration 0ldde&!p  
g?i_10Xlp  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" `a2Oj@jP  
C>@~W(IE  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> RN3w{^Ll  
.d9VV&  
(^9q7)n  
<hibernate-configuration> ^#S  
}x-~>$:"  
7s5?^^  
<session-factory > "F|OJ@M  
-NZj:N  
}<&g1x'pa  
<!?JDBC驱动程序--> Qkk~{OuC  
:H\6wJ  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> z0HCmj9T  
mw`%xID*  
\
J-O b  
<!-- 连接数据库的URL--> ?i(Tc
!  
pp#Kb 2*  
<property name="connection.url"> w])bQ7)  
gA!-F}x$  
jdbc:mysql://localhost:3306/schoolproject &6MGPh7T  
Ajq;\-:  
</property> t22BO@gt74  
IVkKmO(q
O  
<property name="connection.useUnicode">true</property> rEdr8qw  
rem&F'x0V  
<property name="connection.characterEncoding">UTF-8</property> *u7C){)gr[  
!V@Y \M d  
v<tH 3I+  
<!--连接的登录名--> Iu(T@",Q#  
N!"GwH  
<property name="connection.username">root</property> >H5BY9]I  
v>)[NAY9  
}.2pR*W  
<!--登录密码--> VrO$SmH  
xv7^  
<property name="connection.password"></property> YIfPE{,  
$|6Le; K  
cdP+X'Y4D  
<!-- C3P0连接池设定--> \(Zdd \,  
Si*Pi  
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider xHykU;p@  
.m/Lon E  
</property> 0'BR Sa<  
MJV&%E6{:{  
<property name="hibernate.c3p0.max_size">20</property> 7x-k-F3  
c2?(.UV  
<property name="hibernate.c3p0.min_size">5</property> 52l|  
xYM/{[  
<property name="hibernate.c3p0.timeout">120</property> ^lRXc.c z  
A~I}[O~(pb  
<property name="hibernate.c3p0.max_statements">100</property> z=>]E1'RL  
A~nq4@uj  
<property name="hibernate.c3p0.idle_test_period">120</property> _\sm$ `q  
UH%?{>oRh  
<property name="hibernate.c3p0.acquire_increment">2</property> pR 1v^m|  
N.xmHvPk  
wxo(  
<!--是否将运行期生成的SQL输出到日志以供调试--> l%fnGe` _  
StP6G ]x  
<property name="show_sql">true</property> 0NpxqeIDY  
)/bt/,M&}  
_h@7>+vl~  
<!--指定连接的语言--> &sJpn*W  
pVt-7AgW  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 9S&6u1  
>0@X^o  
^;W,:y&  
<!--映射Student这个资源--> CL9p/PJ%e  
evg i\"  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> dWD9YIYf  
}Ss#0Gee  
>\}2("bv  
</session-factory> #5G!lbH  
[ "J  
l+R-lsj  
</hibernate-configuration> ./5|i*ow  
wzo-V^+q  
fRaVY`|wK  
1;vn*w`p  
3．proxool连接池 @%ChPjN  
'n!;7*  
(1) 先写proxool的配置文件，文件名：proxool.xml（一般放在与hibernate.cfg.xml文件在同一个目录中）本例配置的是MYSQL数据库，数据库的名字为schoolproject U G^6I5  
YIgzFt[L  
] =>vv;L  
<?xml version="1.0" encoding="UTF-8"?> q*Ns]f'a  

((EN&X,v  
<!-- the proxool configuration can be embedded within your own application's. C"IPCJYn  
7ou2SL}k  
Anything outside the "proxool" tag is ignored. --> |`qur5h`  
kc~Z1  
!p&M,6  
<something-else-entirely> GsqrKrbJ  
k[Uc_=  
<proxool> Ik;~u8j1e  
,W*<e-  
<!--连接池的别名--> z6'zNM7M  
JsfbY^wz  
<alias>DBPool</alias> H -.3r  
 A3'i -  
K{M_ 4'\  
<!--proxool只能管理由自己产生的连接--> @] )a  
,E)bS7W  
<driver-url> &giJO-^ f  
)F4er'  
jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 .t"s>jq 1  
'cH),~ z  
</driver-url> *|euC"5c  
(X>r_4W$  
<!?JDBC驱动程序--> ms;Lu-UR  
:8Q6=K87  
<driver-class>com.mysql.jdbc.Driver</driver-class> fB  
@f*/V e0.  
<driver-properties> 5IdmKP|  
']Y:f)i#  
<property name="user" value="root"/> T`a [~:  
3gv>AgG  
<property name="password" value=""/> eg?vYW  
7OC,KgJ3  
</driver-properties> qG=`'%,m  
;EFs2-{K  
TrkoLJmB  
<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回 `Ph4!-6#  
aWe H,A%  
收,超时的销毁--> {r'#(\  
/Pg66H#RUf  
<house-keeping-sleep-time>90000</house-keeping-sleep-time> Sw'DS  
$`l- c
SH;  
Q$kSK+ q!  
<!-- 指因未有空闲连接可以分配而在队列中等候的最大请求数,超过这个请求数的 tTWYlbDFN  
VEb}KFyP  
用户连接就不会被接受--> Z33wA?9  
?F?!QrL  
<maximum-new-connections>20</maximum-new-connections> VWLou j
B  
Q CfA3*  
c?<FMb3]  
<!-- 最少保持的空闲连接数--> rf)\:75  
5"XcVH4g  
<prototype-count>5</prototype-count> oh&
PQ{  
IWm|6@y  
aeH 9:GQ6  
<!-- 允许最大连接数,超过了这个连接，再有请求时，就排在队列中等候，最大的 De4+4&  
!R)v2Mk|  
等待请求数由maximum-new-connections决定--> (O&ooM* o  
P}?
,*'b  
<maximum-connection-count>100</maximum-connection-count> U6.$F#n  
? 76jz>;b  
~73YOGiGJH  
<!-- 最小连接数--> Fo;xA  
Vs{|:L+  
<minimum-connection-count>10</minimum-connection-count> *QAK9mc  
m:p1O3[R  
_h@e.BtD
s  
</proxool> !Otyu6&  
#[I`VA\x  
</something-else-entirely> }4eSB  
~5cLI;4h  
=C<_rBY  
(2)配置hibernate.cfg.xml文件 lv$tp,+  
gfih;i.pY  
<?xml version='1.0' encoding='UTF-8'?> JRU)AMMU&  
tOp>OoD  
<!DOCTYPE hibernate-configuration RE*UIh*O  
q'c'rN^  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" pmQ9iA@=  
(zgXhx_!D  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> T-|z18|!  
Zf?>:P  
Pfi '+I`s  
<hibernate-configuration> bX5>qqB]  
1{nXmtvr  
)ALf!E%{  
<session-factory > \'E%ue_<9  
/0"Y. @L  
a#j0N5<Nl  
<property name="hibernate.connection.provider_class"> #p=/P{*  
H$1R\rE`  
org.hibernate.connection.ProxoolConnectionProvider EkjO4=~UC  
roW8 4x  
</property> <A"}Krq?  
nuKjp Ap!  
<property name="hibernate.proxool.pool_alias">DBPool</property> a7OD%yQ  
_?O'65  
<property name="hibernate.proxool.xml">proxoolconf.xml</property> Q> @0'y=s  

ivw2EEo,  
}@a_x,O/x}  
<!--是否将运行期生成的SQL输出到日志以供调试--> in#g  
=3/||b4c  
<property name="show_sql">true</property> *PZNZ{|m  
` [@ F3x  
MH!'g7iK8  
<!--指定连接的语言--> `C] t2^  
_j<46^  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> =$Xdn'  
,Qj7wFZ  
!:rQ@PSy9  
<!--映射Student这个资源--> 8BLtTpu  
"{L%5:H@  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> AP/5,M<  
N55;oj_K  
Ngh9+b6[  
</session-factory> Wd&!##3$Q  
XP6R$0yN  
).-B@&Eu%  
</hibernate-configuration> 1 ,[T;pdDd  
!*+~R2&b
 
)Hl;9  
(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息 (j}"1  
K~v"%sG{`  
(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 0I~xD9l9  
}MXZ  
(3) hibernate.proxool.xml是向Hibernate声明连接池的配置文件位置，可以用相对或绝对路径，用相对路径时要注意一定在要Path范围内！不然会抛出异常。 yv4hH4Io
 
",`fGu )  
(4) dialect是声明ＳＱＬ语句的方言 y\r8_rBo  
x1Z?x,-D"  
(5) show_sql定义是否显示Hibernate生成的ＳＱＬ语言，一般在调试阶段设为true,完成后再改成false，这样有利于调试。 BE}lzn=sF  
uK}k]x\z  
(6) <mapping >资源文件映射 N<Ti]G  
h_x"/z&  
tY%c-m  
4． JNDI连接池，数据源已经由应用服务配置好(如Web服务器)，Hibernate需要做的只是通过JNDI名查找到此数据源。应用服务器将连接池对外显示为JNDI绑定数据源，它是javax.jdbc.Datasource类的一个实例。只要配置一个Hibernate文件，如： 3D;\V&([  
~A [ Ju%R  
hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 }UQBaqDH  
c%Kv"Z%f  
hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory Zpl?zI  
N;<<-`i  
hibernate.transaction.manager_loopup_class = [ o3}K  
ZZzf+F)T  
org.hibernate.transaction.JBossTransactionManagerLookup 'UW7zL5  
VA4_>6  
hibernate.dialect=org.hibernate.dialect.MySQLDialect C37KvLQ