hibernate连接池

1．Hibernate默认连接池 ;N/=)
m  
-a(\(^NW  
<?xml version='1.0' encoding='UTF-8'?> <(<19t5.  
B%e#u.'6  
<!DOCTYPE hibernate-configuration %M_5C4&6  
B,dHhwO*l  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" +iL,8eW  
p<9e5`&I  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> Y><")%Q  
1>1ii  
*;I F^u1  
<hibernate-configuration> >RMp`HxDf  
r31H Zx1^  
/Dn  
<session-factory > >=Z@)PAe  
l.wf= /  
/Vy8%   
<!?JDBC驱动程序--> .O+qtk!  
]CIZF,  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> >&kb|)  
Pv(icf
l|  
dqvgyyq  
<!-- 连接数据库的URL--> -S(_ZbeN  
|NiWr1&i0  
<property name="connection.url"> 389puDjy  
`*1059   
jdbc:mysql://localhost:3306/schoolproject ^9Je8 @Yu  
"[LSDE"(  
</property> VC6S4FU4K  
@$(/6]4p  
<property name="connection.useUnicode">true</property> +yYv"J  
8'kA",P  
<property name="connection.characterEncoding">UTF-8</property> B?xu
!B,  
.7nr:P  
&$?i  
<!--连接的登录名--> "w\Iz]  
W]v[Xm$q  
<property name="connection.username">root</property> Je6=N3)  
pSq3\#Twr  
)n[ oP%  
<!?登录密码--> GAlAFsB  
N!e?K=}tL  
<property name="connection.password"></property> Dl#%tYL+3h  
w C0fPPeA  
B!hrr  
<!--是否将运行期生成的SQL输出到日志以供调试--> w]{NaNIeq1  
}0({c~z\  
<property name="show_sql">true</property> ]bq<vI%  
8'2lc  
PG1#Z?_  
<!--指定连接的语言--> s)e; c<(/  
3-Q*umh  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> `aS9o]t  
g]g2`ab |  
(zFUC]  
<!--映射Student这个资源--> V+()`>44  
_faI*OY8  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> w:z@!<  
tzxp0&:Z].  
m_TZY_;  
</session-factory> jaAv_=93f  
U/B1/96lJ  
$rySz7NI  
</hibernate-configuration> ^;2dZgJ4^  
<N%8"o  
\Mv8pU  
2．C3P0连接配置 ;n*N9-|.  
Z:#-4CiP  
<?xml version='1.0' encoding='UTF-8'?> H>-?/H  
{V!Jj6n  
<!DOCTYPE hibernate-configuration =#i#IF42?  
j${:Y$V
mE  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" UC^Bn1  
W"rX$D[Le  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 1GY[
1M1^  
N[j7^q7Xt  
c 25wm\\  
<hibernate-configuration> W?"Z>tgp  
yD`{9'L -  
>?,arER  
<session-factory > ?wps_XU  
lHpo/R:  
U4_<  
<!?JDBC驱动程序--> *HmL8c  
C.{*|#&GAt  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> icF -
`m  
_c|>m4+X  
7cn"@h rJ  
<!-- 连接数据库的URL--> ,>%AEN6N2  
3:a}<^DuCS  
<property name="connection.url">  ]D7z&h  
B{W2D  
jdbc:mysql://localhost:3306/schoolproject oOuhbFu  
1;ulqO  
</property> i4.s_@2Y  
S\Qh#yFT  
<property name="connection.useUnicode">true</property> #](k,% 2  
/|y3M/;F  
<property name="connection.characterEncoding">UTF-8</property> }[PbA4l.g  
Y9m'RFZr  
{=7W;uL  
<!--连接的登录名--> HLAYmXX"w  
V9"Kro  
<property name="connection.username">root</property>
joifIp_  
=MG  
)\uy 0+b  
<!--登录密码--> 5cP]  
p;) ;Vm+8  
<property name="connection.password"></property> _f,q8ZkSr  
>ofS'mp  
:Qu!0tY  
<!-- C3P0连接池设定--> <W vuW6  
MUNeGqv  
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider <27B*C M  
-(>x@];r0  
</property>
B|%=<1?  
amGQ!$] %#  
<property name="hibernate.c3p0.max_size">20</property> d {moU\W  
C4Q^WU+$j  
<property name="hibernate.c3p0.min_size">5</property> #JZf]rtp  
C^r3r6  
<property name="hibernate.c3p0.timeout">120</property> +U^dllL7  
"G|Gyc  
<property name="hibernate.c3p0.max_statements">100</property> 2?ZHWS>U  
lw?
f2_fi  
<property name="hibernate.c3p0.idle_test_period">120</property> w"-bO ~5h  
V/|Ln*rm  
<property name="hibernate.c3p0.acquire_increment">2</property> t9m:E  
p7!q#o  
P-No;/!B#  
<!--是否将运行期生成的SQL输出到日志以供调试--> tF&%
7(EU3  
uGJeQ  
<property name="show_sql">true</property> \XMl8G  
Lq LciD  
wH!]B-hn  
<!--指定连接的语言--> N{P (ym2yR  
1_/\{quE  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> D}!U?]la&  
{C*mn!u  
(7}v}3/  
<!--映射Student这个资源--> Q-}oe Q
 
3Du&KZ  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> u!nt0hS  
I_#)>%H  
UNYU2ze'  
</session-factory> y~1UU3k5  
Ft`#]=IS  
pWps-e  
</hibernate-configuration> e7/J:n$  
Bi kCjP[b  
b]RnCu"  
9A3Q&@,  
3．proxool连接池 &)fPz-s  
4pq>R  
(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 ?Dm!;Z+7  
H:9( XW  
DfV_0
8  
<?xml version="1.0" encoding="UTF-8"?> wGISb\rr  
ffm19B=  
<!-- the proxool configuration can be embedded within your own application's. AGCqJ8`|T  
RPaB4>  
Anything outside the "proxool" tag is ignored. --> m^T$H_*;  
6Om-[^  
Cj5M  
<something-else-entirely> ~v,LFIT  
)OH!<jW  
<proxool> i>,5b1x~  
RLulz|jC  
<!--连接池的别名--> orzdq  
p//">l=Ps  
<alias>DBPool</alias> Os@ofnC  
LC[
,K  
M?$-u  
<!--proxool只能管理由自己产生的连接--> \|j`jsq  
a+weBF#Z  
<driver-url> PU?kQZU~)  
= "c _<?=[  
jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 $am7 xd  
4)'5;|pI  
</driver-url> sd8o&6  
51;(vf  
<!?JDBC驱动程序--> do=VPqy
 
]X?+]9Fr  
<driver-class>com.mysql.jdbc.Driver</driver-class> s o~p+]  
|nD2k,S<?  
<driver-properties> {,s:vPoiA  
'Q(A5zfN]Y  
<property name="user" value="root"/> fhfdNmtR)I  
fU)hn  
<property name="password" value=""/> mL6/NSSz  
L<8y5B~W  
</driver-properties> e|MyA?`  
e>z7?"N  
\3)%p('  
<!-- 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 ,~G _3Oz  
CF42KNq  
收,超时的销毁--> YLobBtXc9  
Ubn5tN MK  
<house-keeping-sleep-time>90000</house-keeping-sleep-time> i7fpl  
`i{o8l  
>r]# 77d  
<!-- 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 Mh_jlgE'd#  
yuI5# VUS  
用户连接就不会被接受--> E/s3@-/
 
&nz1[,  
<maximum-new-connections>20</maximum-new-connections> },i?3dSvl  
te:"
1:e  
D;d;:WT5  
<!-- 最少保持的空闲连接数--> wau81rSd  
79x^zqLb  
<prototype-count>5</prototype-count> *^.b}K%  
-BoN}xE4  
I}k!i+Yl  
<!-- 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 B[$KnQM9Y  
o~iL aN\+  
等待请求数由maximum-new-connections决定--> *ZaK+ B
 
g_n=vO('X  
<maximum-connection-count>100</maximum-connection-count> OvK_CN{  
C|!E'8Rw  
>Q+EqT  
<!-- 最小连接数--> |qbJ]v!  
MQG$J!N  
<minimum-connection-count>10</minimum-connection-count> *Z/B\nb  
" *Ni/p$I  
9m6w.:S  
</proxool> /pb7  
#Wc)wL-Tg  
</something-else-entirely> bJBx~  
3`e1:`Hu  
IRS^F;
)  
(2)配置hibernate.cfg.xml文件 '!f5|l9SC  
1.>sG2*P  
<?xml version='1.0' encoding='UTF-8'?> YKM(qh2  
{L4^IKI  
<!DOCTYPE hibernate-configuration xc*ys-Nv  
s#qq% @  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" :'!?dszS  
0q`'65 lx  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 2RE }l=h5  
le[5a=e(  
t}oxHEa V  
<hibernate-configuration> eq4<   
e|4jT7L}  
hF2 G{{8A  
<session-factory > UoKBcarm  
vNtbb]')m  
+ZZiZ&y  
<property name="hibernate.connection.provider_class"> ZcdS?Z2k  
CyXcA;H,.  
org.hibernate.connection.ProxoolConnectionProvider ^WD[>E~  
=3J~
Fk  
</property> BO[A1'>  
uox;PDK  
<property name="hibernate.proxool.pool_alias">DBPool</property>
Y0eu^p)  
b?y1cxTT  
<property name="hibernate.proxool.xml">proxoolconf.xml</property> c|O5Vp}  
3}T&|@*  
-nd6hx  
<!--是否将运行期生成的SQL输出到日志以供调试--> Viw{<VH=  
T%]: tDa  
<property name="show_sql">true</property> z$YOV"N  
(wA|lK3  
igo7F@_,  
<!--指定连接的语言--> wvh4AE5F|z  
&<>A  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ^~Ar  
!*\^-uvaK  
t(_XB|AKm  
<!--映射Student这个资源--> "thu@~aC  
/aPq9B@  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> OVivJx  
<$=8'$T81  
n1;V2k{uV  
</session-factory> {< wq}~  
m3|,c[M1  
<QJmdcG  
</hibernate-configuration> )8N/t6Q  
je{5iIr3/  
#pVk%5N  
(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息 |6;.C1\,  
|mM
7P^I  
(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 h\ybh  
z1:auodI@  
(3) hibernate.proxool.xml是向Hibernate声明连接池的配置文件位置，可以用相对或绝对路径，用相对路径时要注意一定在要Path范围内！不然会抛出异常。 ( Rf)&KN  
%%3ugD5i!  
(4) dialect是声明ＳＱＬ语句的方言 IM@Qe|5  
LvAIAknc  
(5) show_sql定义是否显示Hibernate生成的ＳＱＬ语言，一般在调试阶段设为true,完成后再改成false，这样有利于调试。 HR V/ A  
>:Oo[{)  
(6) <mapping >资源文件映射 gM=~dBz  
M1g|m|H7  
'"KK|]vJ  
4． JNDI连接池，数据源已经由应用服务配置好(如Web服务器)，Hibernate需要做的只是通过JNDI名查找到此数据源。应用服务器将连接池对外显示为JNDI绑定数据源，它是javax.jdbc.Datasource类的一个实例。只要配置一个Hibernate文件，如： U{_O=S u  
>H%8~ Oek  
hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 #".{i+3E  
aY?}4Bx  
hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 4t+88
e  
LS_QoS  
hibernate.transaction.manager_loopup_class = ^wHO!$  
MR~BWH?@1  
org.hibernate.transaction.JBossTransactionManagerLookup q6DhypB  
onmO>q*  
hibernate.dialect=org.hibernate.dialect.MySQLDialect \e?T9c6,