hibernate连接池

1．Hibernate默认连接池 tB(Q-c  
pvmm" f  
<?xml version='1.0' encoding='UTF-8'?> czMLvPXRx  
);))kYr  
<!DOCTYPE hibernate-configuration vJ"@#$.  
4] ?  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ] {NY;|&I'  
d1y(Jt  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> g?=B{V  
0@AK  
Gw+z8^|C&}  
<hibernate-configuration> ?\vJ8H[bD  

!@VmaAT  
-8 &f=J)  
<session-factory > {g/\5Z\b  
Z?nMt  
{qL
nwy!i  
<!?JDBC驱动程序--> J|xqfY@+  
~S-x-cZ  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> |{9"n<JW  
0A 4(RLGg  
ke3=s  
<!-- 连接数据库的URL--> 0eQ5LG?)  
m@zxjIwT  
<property name="connection.url"> m7M*)N8  
kJDMIh|g  
jdbc:mysql://localhost:3306/schoolproject Opjt? ]  
R4IFl z  
</property> GuDus2#+  
K] Eq"3  
<property name="connection.useUnicode">true</property> aaaC8;.  
Pi8U}lG;  
<property name="connection.characterEncoding">UTF-8</property> *f4KmiQ~%  
B1Lnu
B%  
L\-T[w),z7  
<!--连接的登录名--> #e9B|Y?b  
&0>{mq}p,:  
<property name="connection.username">root</property> >Mvt;'c  
QGshc  
N}dJ)<(2~  
<!?登录密码--> .Zwn{SMtu  
'm2,7]  
<property name="connection.password"></property> pnqjATGU  
F5MWxAS,>  
@EZXPU  
<!--是否将运行期生成的SQL输出到日志以供调试--> 7PisX!c,h  
l|&|+u#  
<property name="show_sql">true</property> @{
nT4{  
Aga7X@fV(  
}XXE hOO  
<!--指定连接的语言--> CLYcg$V  

EI_J7J+  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> Jhj]rsGk  
Yb?#vp
I  
+pFz&)?  
<!--映射Student这个资源--> ~Snw':  
(=PnLP  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> *uv\V@0  
BryMq !  
{K|{a  
</session-factory> G
B !3Z  
z?gJHN<  
~P/G^cV3s  
</hibernate-configuration> B[$SA-ZHi  
QWxQD'L'  
}>OE"#si  
2．C3P0连接配置 J`x9XWYw  
R-h7c!ko  
<?xml version='1.0' encoding='UTF-8'?> t*<c+Ixu  
3AB5Qs<  
<!DOCTYPE hibernate-configuration )8k6GO8|  
'{+hti,Lh  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" 1u`Z?S(  
@+2Zt%  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> u(~s$ENl  
D=OU61AA  
(%r:PcGMEV  
<hibernate-configuration> au7BqV!uL  
utTek5/  
'+eP%Y[W%  
<session-factory > s=d?}.E$  
rcbi
xOT  
J\{)qJ*jp  
<!?JDBC驱动程序--> I&vB\A  
e-s@@k  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> [Ytia#Vv  

Wu}Co  
%sq=lW5R{b  
<!-- 连接数据库的URL--> dqkkA/1  
>2|#b  
<property name="connection.url"> $wN.~"T  
Z/I!\  
jdbc:mysql://localhost:3306/schoolproject Oh^X^*I$@  
BNByaC  
</property> |z4/4Y@  
c]LH.  
<property name="connection.useUnicode">true</property> L fi]s  
/qCYNwWH9  
<property name="connection.characterEncoding">UTF-8</property> 9w(j2i q  
z_H2L"Z  
ZN)/doK  
<!--连接的登录名--> z=xHk|+'  
}+B7C2_\  
<property name="connection.username">root</property> H z6H,h  
(r|T&'yK  
]@f6O*&=  
<!--登录密码--> ^U =`Rx  
lz*PNT{E  
<property name="connection.password"></property> dOhV`8l  
~U1iB  
s%:fB(  
<!-- C3P0连接池设定--> =UV?Pi*M>  
zZxP= c  
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider 0L1P'*LRU  
^4[\-L8Lpq  
</property> J!H5{7.efN  
aw 7f$Fqk  
<property name="hibernate.c3p0.max_size">20</property> j@ "`!uPz  
<,GHy/u\  
<property name="hibernate.c3p0.min_size">5</property> x B?:G  
MJb = +L  
<property name="hibernate.c3p0.timeout">120</property> 7mjj%  
$i1A470C  
<property name="hibernate.c3p0.max_statements">100</property> 2eK\$_b_  
!vB%Q$!x  
<property name="hibernate.c3p0.idle_test_period">120</property> .~8+s.y  
zbR.Lb  
<property name="hibernate.c3p0.acquire_increment">2</property> <\8   
g IKm  
SQ!lgm1bA  
<!--是否将运行期生成的SQL输出到日志以供调试--> DG-vTr  
>R:+ml  
<property name="show_sql">true</property> So^`L s;
S  
[E^X=+Jnz  
s,k1KTXg<B  
<!--指定连接的语言--> Dmi;# WY  
g#
:XN  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> h=tu+pn  
)eEvyU  
gh}AD1TN]  
<!--映射Student这个资源--> J*Hn/m  
CJOl|"UyJ  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> v(h Xk]S  
]*@$%iCPE  
Fdw[CYHz  
</session-factory> Vr1
|%*0Tv  
2P ?Iu&  
w'0M>2  
</hibernate-configuration> 0q>lW &J  
EAB+kY  
)R@gnTe  
QL2y,?Mz7  
3．proxool连接池 ])L'Rk#4  
LwPM7S~ *  
(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 gJxVU41  
=.oWguzu  
P` F'Nf2U  
<?xml version="1.0" encoding="UTF-8"?> t"p#iia  
HdUW(FZ  
<!-- the proxool configuration can be embedded within your own application's. FBAC9}V"  
grdyiBSVn  
Anything outside the "proxool" tag is ignored. --> E@6r{uZ#  
4.B*B3  
Pu*HZW3l
 
<something-else-entirely> "T%'Rp`j|  
&i^NStqu  
<proxool> cu^*x/0,  
$F7gH  
<!--连接池的别名--> 'F?Znd2L  
>Ron+ oe  
<alias>DBPool</alias> Ww&- `.  
Qsxkw  
k3[h'.ps  
<!--proxool只能管理由自己产生的连接--> i;zGw.;Q  
5b`xN!c  
<driver-url> Z_ gVYa  
by]|O  
jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 bM0[V5:jB  
!b->u_  
</driver-url> -,A5^>}%,Y  
^s~n[  
<!?JDBC驱动程序--> fEG3b#t N  
h_chZB
'  
<driver-class>com.mysql.jdbc.Driver</driver-class> 5
%+bWI{w  
0#fG4D_  
<driver-properties> kqvJ&7  
0 ;_wAk  
<property name="user" value="root"/> Owpg]p yVD  
XVDd1#h  
<property name="password" value=""/> ,V]A63J  
Gz|%;  
</driver-properties> Wj j2J8B  
#f3;}1(  
+>:}req  
<!-- 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 Rs F3#H  
aMvK8C%7  
收,超时的销毁--> wz*A<iU  
uz#PBV8Q  
<house-keeping-sleep-time>90000</house-keeping-sleep-time> q= yZx)  
y+";  
.p(6' TYnI  
<!-- 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 ('**nP  
|pH* CCA  
用户连接就不会被接受--> $EQT"ZX>%i  
FQ^<,  
<maximum-new-connections>20</maximum-new-connections> hX8gV~E=y  
02W4-*)  
zyZok*s  
<!-- 最少保持的空闲连接数--> `\ef0  
2z.8rNwT  
<prototype-count>5</prototype-count> ].-J.  
Sj0 ucnuHi  
&,N3uy;Gc  
<!-- 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 J+@MzkpK  
3|K=%jr[  
等待请求数由maximum-new-connections决定--> jom}_  
5%QC ][,  
<maximum-connection-count>100</maximum-connection-count> [+%d3+27  
yE.495  
']ITuP8  
<!-- 最小连接数--> (:?5 i`  
\)^,PA3  
<minimum-connection-count>10</minimum-connection-count> O&#S4]Y   
=mKfFeO.  
_K0izKTA.  
</proxool> g
[EM]q,  
GUu\dl9WA'  
</something-else-entirely> pcI&  
ZDOF  
C#U<k0R  
(2)配置hibernate.cfg.xml文件 #~H%[sa  
{PODisl>\D  
<?xml version='1.0' encoding='UTF-8'?> xb =
8t!  
&'5@azU  
<!DOCTYPE hibernate-configuration xvwD3.1  
yu`KzIU  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"  xFBh?  
~\IF9!  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> Io$w|~x  
u}K5/hC  
J3/\<=Qh  
<hibernate-configuration> ;cv.f>Cm  
gYTyH.  
,f8}q]FTA  
<session-factory > M82.khm~jM  
>Z#uFt0<Pm  
pN\)(:"8v  
<property name="hibernate.connection.provider_class"> NuC-qG#  
V";mWws+?#  
org.hibernate.connection.ProxoolConnectionProvider J+ Jt4  
e>L5.~i  
</property> J[
e}  
*j|/2+pq  
<property name="hibernate.proxool.pool_alias">DBPool</property> |-~b$nUe  
_PK}rr?"7O  
<property name="hibernate.proxool.xml">proxoolconf.xml</property> D:=t*2-Iv  
.)LZ`Ge3F  
r_b8,I6{]  
<!--是否将运行期生成的SQL输出到日志以供调试--> N]B)Fb  
y,MPGW_  
<property name="show_sql">true</property> uQH%.A  
4bP13f  
R'rTE  
<!--指定连接的语言--> u@<Pu@?xm  
yC0C`oC  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> wk" l[cH>  
^'m\D;
 
hS4.3]ei  
<!--映射Student这个资源--> ?nQ_w0j  
)VNM/o%Q  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> J!rY 6[t  
j7K5SS_]  
9lKn%|=T  
</session-factory> OkLz^R?d  
]JH64~a  
1Fv8T'  
</hibernate-configuration> 0s1'pA'  
Rv98\VD"  
*RBV'b  
(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 ]fj-`==  
bG"HD?A_  
(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 Re>AsnA[  
Q8p=!K  
(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。 m+?N7  
X2qv^G,  
(4) dialect是声明ＳＱＬ语句的方言 ^EF

'TO$  
2Zy_5>~  
(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。 S.{fDcM  
e9&+vsRmA  
(6) <mapping >资源文件映射 ]fZ<`w8u}  
a5|@R<iF  
%Uy%kN_&  
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： _K'7(d0z  
G8eD7%{b:)  
hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 BWh}^3?l  
pV7N byb4  
hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory K1OkZ6kl  
4jQ'+ 2it  
hibernate.transaction.manager_loopup_class = yG\UW&P  
@xS]!1-  
org.hibernate.transaction.JBossTransactionManagerLookup %]!adro~  
&iqw! ud  
hibernate.dialect=org.hibernate.dialect.MySQLDialect 2:Q(Gl`<l