hibernate连接池

1．Hibernate默认连接池 uV52ko,  

G~8C7$0z  
<?xml version='1.0' encoding='UTF-8'?> ~7 C` a$  
A"I:cw"KY  
<!DOCTYPE hibernate-configuration V\PGk<VO   
0>4:(t7h\  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" $}aLFb  
o{ \cCZ"  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> d#vq+wR  
P`Anf_  
f`RcfYt  
<hibernate-configuration> Uj0DX>I  
9FX'Uws  
4ZQXYwfC|  
<session-factory > /tJJ2 =%l  
Ca*^U-  
#J, `a.  
<!?JDBC驱动程序--> JdfjOlEb  
87>\wUJ  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> K S,X$)9  
/(E)|*~6  
Hl?\P6  
<!-- 连接数据库的URL--> _E:]qv  
.AWRe1?  
<property name="connection.url"> v\c.xtjI5x  
bMxzJRrNg  
jdbc:mysql://localhost:3306/schoolproject B+*F?k[  
8D;>
]>  
</property> ]EE}ax%#aq  
+[V?3Gdb  
<property name="connection.useUnicode">true</property> xQm!  
enO5XsIc  
<property name="connection.characterEncoding">UTF-8</property> )`,3/i9C$  
X[(u]h`  
g
K9@-e  
<!--连接的登录名--> jQj`GnN|  
d
s4ERe /  
<property name="connection.username">root</property> iU~oPp[e  
Zc{
at}{  
{O]Cj~}  
<!?登录密码--> DKF`uRvGN:  
<lB^>Hfu  
<property name="connection.password"></property> oZmni9*SD  
ORA+>  
@L=xY[&{  
<!--是否将运行期生成的SQL输出到日志以供调试--> bv4lgRE6Y  
cmZ39pjBJ
 
<property name="show_sql">true</property> <nvz*s  
!n}"D:L(  
Qg%B<3 <  
<!--指定连接的语言--> R8W{[@  
hof:36 <  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> <FRYt-+  
bfQ+}|;  
WDP$w(M  
<!--映射Student这个资源--> t1 OnA#]/_  
*<i { Mb Q  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> vc^qpOk  
SYw>P1  
u1~H1 ]Ii  
</session-factory> Kaa
uX m  
>TeTa l  
V[(zRGa{  
</hibernate-configuration> (caxl^=  
6*lTur9ni  
?N~rms e  
2．C3P0连接配置 ~Ub'5
M  
~N;kF.q&>&  
<?xml version='1.0' encoding='UTF-8'?> y['$^T?
oP  
{uM
*.]  
<!DOCTYPE hibernate-configuration jri=UGf  
\@N8[  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Y#=0C*FS  
\uc]+nV!o  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> Ev,>_1#Xm  
^r?ZrbS
bz  
}Cvf[
H1+  
<hibernate-configuration> 7ykpDl^@  
Z_zN:BJ8L  
%u,H2*  
<session-factory > q3z<v:=1y  
[O2xE037h`  
,gVA^]eDh  
<!?JDBC驱动程序--> 0B>hVaj>-  
@dvlSqm)  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 2y>~<S  
D. fPHq  
i/6(~v  
<!-- 连接数据库的URL--> %d c=QSL  
+g(>]!swb  
<property name="connection.url"> [d`J2^z}  
@>}!g9c  
jdbc:mysql://localhost:3306/schoolproject CCNrjaA  
E].hoq7WiB  
</property> ]]Sz|6P  
%?Yf!)owh  
<property name="connection.useUnicode">true</property> w<!F& kQB  
V8@VR`!'  
<property name="connection.characterEncoding">UTF-8</property> fZw/kjx@  
p9 <XaJ}  
2-s ,PQno^  
<!--连接的登录名--> 66(|3DX  
i+ ]3J/J  
<property name="connection.username">root</property> *39Y1+=)$$  
3
+%a  
S1p4.qJ  
<!--登录密码--> [
_Fj2nb*  
<U%4$83$  
<property name="connection.password"></property> U>H"N1  
r7+"i9  
7hQXGY,q  
<!-- C3P0连接池设定--> InBnU`(r  
v6uR[18  
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider 1xP*  
uD0T()J.P5  
</property> e{EKM4  
wj!YYBH  
<property name="hibernate.c3p0.max_size">20</property> A=JPmsj.  
{$-lXw4  
<property name="hibernate.c3p0.min_size">5</property> (HbA?Aja  
BCMQ^hP}t  
<property name="hibernate.c3p0.timeout">120</property> #Z#rOh  
C jISU$O  
<property name="hibernate.c3p0.max_statements">100</property> $9
YA
q/#Q  
NX%"_W/W  
<property name="hibernate.c3p0.idle_test_period">120</property> NOM6},rp  
akATwSrU  
<property name="hibernate.c3p0.acquire_increment">2</property> i=T!4'Zu  
Tsg;i;  
.;}vp*  
<!--是否将运行期生成的SQL输出到日志以供调试--> UCV1{  
!0!m |^c5  
<property name="show_sql">true</property> $ha,DlN  
vX1 8 ]  
B6ee\23  
<!--指定连接的语言--> C$WUg<kcK'  
r&+8\/{  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> +i^@QNOa  
cZC%W!pT  
5QN~^  
<!--映射Student这个资源--> 3w!8PPl  
'tvX.aX2  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> cQ}
3? v  
xKl\:}Ytp  
AK$&'t+$}7  
</session-factory> 7"Qj(N  
41G}d+  
@=rYOQj|  
</hibernate-configuration> NW_i<#  
0RFBun{  
$-Iui0h  
D8X~qt/  
3．proxool连接池 ^G(U@-0..  
=d`w~iC  
(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 MTXh-9DA  
^E~F,]dV=  
rf?%- X(V  
<?xml version="1.0" encoding="UTF-8"?> T,@s.v  
*I]/ [d  
<!-- the proxool configuration can be embedded within your own application's. +2xgMN6B@  
9Xl[AVs:M  
Anything outside the "proxool" tag is ignored. --> sE^ee2]OI@  
7<GC{/^T  
| KtI:n4d  
<something-else-entirely> IVSOSl|  
C(CwsdlP  
<proxool> UOIB}ut V  
56w uk [)  
<!--连接池的别名--> W{A4*{  
J4?i\wD:  
<alias>DBPool</alias> Mh"X9-Ot  
6mV-+CnYC  
w1Txz4JqB  
<!--proxool只能管理由自己产生的连接--> qXqGhHoe;  
2ieyU5q7#  
<driver-url> @cB7tY*Ski  
w.VjGPp  
jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 "hid3"G  
jQBL8<  
</driver-url> e dTFk$0  
iX%9$Bft<  
<!?JDBC驱动程序--> 7f] qCZ<0V  
+[vIocu  
<driver-class>com.mysql.jdbc.Driver</driver-class> ,>!%KYD/f  
I'`90{I  
<driver-properties> t =V| '  
3c%_RI.  
<property name="user" value="root"/> m^%@bu,  
bog
3=Ig-  
<property name="password" value=""/> 3_bqDhVI5  
hsB3zqotF  
</driver-properties> `%A vn<  
]A%]W^G  
fn
#qcZv?  
<!-- 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 mUj_V#v  
PctXh, =  
收,超时的销毁--> "7q!u,u  
F[(ocxQZ3  
<house-keeping-sleep-time>90000</house-keeping-sleep-time> E)%DLZ  
+pPfvE`  
ee/3=/H|;  
<!-- 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 `^ZhxFX  
Gg e X  
用户连接就不会被接受--> 9;7Gzr6A"  
O!!N@Q2g  
<maximum-new-connections>20</maximum-new-connections> j*\oK@  
40%fOu,u`  
[*C%u_h  
<!-- 最少保持的空闲连接数-->  WD55(  
x8w l  
<prototype-count>5</prototype-count> Al1_\vx7  
n:|a;/{I]9  
{p.^E5&  
<!-- 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 &@K6;T  
b)eoFc)lc  
等待请求数由maximum-new-connections决定--> 1etT."  
9(3]t}J5 d  
<maximum-connection-count>100</maximum-connection-count> ZIN1y;dJ  
nll=Vd[  
i50E#+E8  
<!-- 最小连接数--> en>n\;U  
IClw3^\l  
<minimum-connection-count>10</minimum-connection-count> !YPwql(  
7Kf  
:wq]
[0)  
</proxool> >AFQm  
<Drm#2x!E  
</something-else-entirely> yg.o?eML  
~&?57Sw*m  
X J`*dgJ  
(2)配置hibernate.cfg.xml文件 Xdi<V_!BC-  
qV9}N-sS  
<?xml version='1.0' encoding='UTF-8'?> $PG
(>1e  
Qs '_\|/-  
<!DOCTYPE hibernate-configuration v
w 6$v  
cLEd-{x  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" -4[eZ>$A|  
4E2#krE%  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> (gnN</%  
Atb`Q'Yrw  
K@<*m!%<2  
<hibernate-configuration> _TLspqi  
Nw9@
E R  
E[WU  
<session-factory > #.rkvoB0N  
kebk f,`p  
idB1%?<  
<property name="hibernate.connection.provider_class"> eL>wKu:r  
p5jR;nOZ%l  
org.hibernate.connection.ProxoolConnectionProvider !E&l=*lM.  

F?$Vx)HI  
</property> vf zC2  
=;+gge!?bB  
<property name="hibernate.proxool.pool_alias">DBPool</property> O|S,="h"}  
L(bDk'zi  
<property name="hibernate.proxool.xml">proxoolconf.xml</property> v4Wq0>o  
_CPj]m{  
cRH(@b Xr  
<!--是否将运行期生成的SQL输出到日志以供调试--> d5NE:%K  
sj4\lpZ3h  
<property name="show_sql">true</property> L pq)TE#  
43E)ltR=]  
9Nps<+K  
<!--指定连接的语言--> 1.M<u)1GU  
m62Zta  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> w[F})u]E  
v-N4&9)%9  
O}%ESAB  
<!--映射Student这个资源--> s>:gL,%c  
/Yb8= eM  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> tmOy"mq67  
!KJA)znx;(  
Y(t/=3c[  
</session-factory> }]H7uC!t  
TE;f*!  
KTt+}-vP^  
</hibernate-configuration> L@
z[b^  
i6P}MtC1  
g4=C]\1  
(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息 IqV"4  
Ux1j+}y  
(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 -8l(eDm"m  
G
k+R,:  
(3) hibernate.proxool.xml是向Hibernate声明连接池的配置文件位置，可以用相对或绝对路径，用相对路径时要注意一定在要Path范围内！不然会抛出异常。 [0qswsV  
K>vl o/#!  
(4) dialect是声明ＳＱＬ语句的方言 L*dGo,oN  
a_bZT4  
(5) show_sql定义是否显示Hibernate生成的ＳＱＬ语言，一般在调试阶段设为true,完成后再改成false，这样有利于调试。 7TEpjSuF  
@`)>-k  
(6) <mapping >资源文件映射 gm pY[  
Xq )7Im}?  
jI'?7@32`  
4． JNDI连接池，数据源已经由应用服务配置好(如Web服务器)，Hibernate需要做的只是通过JNDI名查找到此数据源。应用服务器将连接池对外显示为JNDI绑定数据源，它是javax.jdbc.Datasource类的一个实例。只要配置一个Hibernate文件，如： vmEn$`&2t  
H\V?QDn  
hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 ?A;RTM  
O:8 u^TP  
hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory h<)ceD<,  
qE3Ud:j  
hibernate.transaction.manager_loopup_class = ]zVQL_%,  
.?rs5[th*  
org.hibernate.transaction.JBossTransactionManagerLookup *jB
n ^  
AADvk_R  
hibernate.dialect=org.hibernate.dialect.MySQLDialect C:]&V*d.v4