hibernate连接池

1．Hibernate默认连接池 XLk<*0tp  
s..lK "b  
<?xml version='1.0' encoding='UTF-8'?> 1Q;}zHd  
G
2 ]H6G$M  
<!DOCTYPE hibernate-configuration CHd9l]Rbe  
:Eh\NOc_O  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" [L`ZE*z  
( m\$hX  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> +;BAV  
#&<)! YY5  
#1c]PX  
<hibernate-configuration> *b *G2f^  
cUqn<Z<n  
TlAR.cV  
<session-factory > V6$xcAE"</  
j.~!dh$mg  
R_]{2~J+  
<!?JDBC驱动程序--> \y6OUM2y  
VUTacA Y>L  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ~AYN  
-aRU]kIf  
dca;'$  
<!-- 连接数据库的URL--> I{JU-Jk|  
K]/4qH$:  
<property name="connection.url"> J{[n?/A{  
V$0dtvGvH  
jdbc:mysql://localhost:3306/schoolproject T@}|zDC#  
o:Qv JcB  
</property> kdz=ltw  
A[G0 .>Wk  
<property name="connection.useUnicode">true</property> 64Lx-avf  
MRU7W4W-~/  
<property name="connection.characterEncoding">UTF-8</property> 0!
[ +Q4"  
u4z&!MT}  
jF`BjxrG  
<!--连接的登录名--> ob+euCuJ  
%0#1t 5g  
<property name="connection.username">root</property> V)Z70J<'  
fQrhsuCrC  
%B.D^]S1:  
<!?登录密码--> q'pK,uNW  
[dtbkQt,c  
<property name="connection.password"></property> r&-m
=Kk$  
Z*G(5SqUh"  
fEB7j-t  
<!--是否将运行期生成的SQL输出到日志以供调试--> XC{eX&,2x  
$/Aj1j`"9+  
<property name="show_sql">true</property> MO;X>D=  
'B+ ' (f  
|t$Ma'P  
<!--指定连接的语言--> {M,,npl  
-}K<ni6  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> t|t#vcB  
BL@:!t  
G0E121`h  
<!--映射Student这个资源--> (EPsTox  
u!1{Vt87  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> QMv@:Eo  
8* Jw0mSw  
W0I#\b18  
</session-factory> w+1Gs ;  
[qsEUc+Z.'  
m%?V7-9!k  
</hibernate-configuration> ETs>`#`6o  
bLt.O(T}  
<\?wAjc,  
2．C3P0连接配置 hY`\&@  
@{Gncy|  
<?xml version='1.0' encoding='UTF-8'?> pW4 cX  
A!^q J#  
<!DOCTYPE hibernate-configuration {v3P9s(  
@k&qb!Qah  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" k4 F"'N  
N&@}/wzZ  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> A$6$,h  
!ct4;.2 D  
Haqm^Ky$  
<hibernate-configuration> q+,Q<2J  
K\|FQ^#UYm  
f 2l{^E#h  
<session-factory > qWw\_S  
n_'{^6*O  
k{t`|BnPKB  
<!?JDBC驱动程序--> Z0l+1iMx  
w&ak"GgV  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> Y3Q9=u*5  
sH\5/'?  
qx%}knB  
<!-- 连接数据库的URL--> )=Jk@yj8x  
6-O_\Cq8  
<property name="connection.url"> @IXsy  
mc4i@<_
?  
jdbc:mysql://localhost:3306/schoolproject j&k6O1_  
.`&F>o(A  
</property> y+7PwBo%e  
* RtgC/  
<property name="connection.useUnicode">true</property> u{L!n$D7  
.ji_nZ4.+  
<property name="connection.characterEncoding">UTF-8</property> %j7XEh<'  

<F04GO\  
p)+k=b  
<!--连接的登录名--> OrK&RC  
[n}T|<  
<property name="connection.username">root</property> ~y7jCcd`  
7F'`CleU  
8U_{|]M  
<!--登录密码--> i&n'N8D@  
0iJue&  
<property name="connection.password"></property> c%qv9  
x#:| }pR  
G+F:
99A  
<!-- C3P0连接池设定--> <m'ow  
`/_G$_  
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider V dn&c  
"!EcbR  
</property> )RcL/n  
r hfb ftw  
<property name="hibernate.c3p0.max_size">20</property> 1x,tu}<u^  
Lco&Fp  
<property name="hibernate.c3p0.min_size">5</property> +U@<\kIF  
SV(]9^nW  
<property name="hibernate.c3p0.timeout">120</property> M %Qt|@O  
R=KQ  
<property name="hibernate.c3p0.max_statements">100</property> XO'l Nb.  
FJd]D[h  
<property name="hibernate.c3p0.idle_test_period">120</property> e zOj+vz  
n..g~$k  
<property name="hibernate.c3p0.acquire_increment">2</property> ?C/Te)  
C$5[X7'  
v~Y^
r2  
<!--是否将运行期生成的SQL输出到日志以供调试--> @62Mk},9 c  
h*<P$t  
<property name="show_sql">true</property> ?y!E-&  
w[ ~#av9  
`Ry]y"K  
<!--指定连接的语言--> Kde9 $  
+k>.Q0n%m  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ZGd!IghL  
<Z/x,-^*<  
-xP!"  
<!--映射Student这个资源--> <=,6p>Eo[  
h3;bxq!q  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> JGQjw(Xs  
YSe.t_K2C  
fX|Y;S-@+  
</session-factory> ]i)j3WDz]  
j.@\3'  
DX|# gUAm  
</hibernate-configuration> wLH] <k  
Alxx[l\<J  
+) m_o"hl  
;I!MLI  
3．proxool连接池 %p0xM  
icgSe:Ci  
(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 g"> {9YE  
ze]h..,]K  
*C:|X b<9  
<?xml version="1.0" encoding="UTF-8"?> ,xxR\}  
0a"c2J  
<!-- the proxool configuration can be embedded within your own application's. _Wa.JUbv  
~((w?Yy"v  
Anything outside the "proxool" tag is ignored. --> Jtk|w[4L  
\R;`zuv  
8M`#pN^  
<something-else-entirely> (#E.`e1#6  
 ({=gw9f  
<proxool> ez6EjUk  
KFwzy U"  
<!--连接池的别名--> h|"9LU4a  
c*@E_}C#  
<alias>DBPool</alias> E3iW-B8u8  

hHM
N6i  
AlIpsJ[UU  
<!--proxool只能管理由自己产生的连接--> y7i*s^ys{  
_&b4aW9<  
<driver-url> X]dwX%:Z!j  
'`uwJ&@  
jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 K]0JC/R6(@  
"UJ S5[7$  
</driver-url> #hsx#x||  
[F6U+1n8e  
<!?JDBC驱动程序--> TBT:/Vfun  
7F{3*`/6  
<driver-class>com.mysql.jdbc.Driver</driver-class> ^cz(}N 6&  
9Q+'n$s0^  
<driver-properties> fu]s/'8B  
b8LLr;oQw  
<property name="user" value="root"/> !GNBDR
r  
:HwA 5Z#  
<property name="password" value=""/> 0PrLuej
z  
-u
8NF_{c  
</driver-properties> X'qU*Eo  
yLQ*"sw\  
E}nH1  
<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回 dKxyA"@  
Evjj"h&0J  
收,超时的销毁--> trp0V4b8  
#odIEC/  
<house-keeping-sleep-time>90000</house-keeping-sleep-time> Ot6aRk  
4s*ZS}] o  
K$E3QVa  
<!-- 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 W|g4z7Pb  
8;+B*+%@n  
用户连接就不会被接受--> ]33>m|?@  
428>BQA  
<maximum-new-connections>20</maximum-new-connections> )j0TeE1R  
1NgCw\  
n+A?"`6*#  
<!-- 最少保持的空闲连接数--> @3C>BLI8+  
]X ?7ZI^  
<prototype-count>5</prototype-count> EH! q=&d  
x?2@9u8Yb  
!~rY1T~  
<!-- 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 OZ~5*v  
E{Ov>osq  
等待请求数由maximum-new-connections决定--> \Yc
'~2n  
~ijVmWNk  
<maximum-connection-count>100</maximum-connection-count> \(^nSy&N  
&p4&[H?  
vPTM  
<!-- 最小连接数--> n T{3o;A  
G?;e-OhV  
<minimum-connection-count>10</minimum-connection-count> |n,<1QY  
'z%o16F)L  
{_ i\f ]L  
</proxool> 1Y7Eajt-5  
K,:cJ  
</something-else-entirely> uP~@U"!  
/7|V+6jV  
/2=#t-p+  
(2)配置hibernate.cfg.xml文件 <~n"m  
I uMQ9&  
<?xml version='1.0' encoding='UTF-8'?> e} P I^bc  
`OXpU,Z 6U  
<!DOCTYPE hibernate-configuration lFV N07hG  
z6
jc8Z=O  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" LHkc7X$  
;;C?{  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> odjT:Vr  
o:3dfO%nuM  
i*Sqda $  
<hibernate-configuration> Kgi<UkFP  
w&o&jAb-M  
ZaV8qAsP  
<session-factory > =F]FP5V  
Q;43[1&3w  
7BK0}sxO  
<property name="hibernate.connection.provider_class"> P3)Nl^/  
 @Z\,q's  
org.hibernate.connection.ProxoolConnectionProvider AP7Yuv`  
:UF%K>k2  
</property>
2(u,SQ  
\eT5flC  
<property name="hibernate.proxool.pool_alias">DBPool</property> zMm#Rhn  
-EkWs/'h  
<property name="hibernate.proxool.xml">proxoolconf.xml</property> rvb
Lyv;~  
Vzdh8)Mu\  
]
2eK  
<!--是否将运行期生成的SQL输出到日志以供调试--> [z`31F  
D#il*  
<property name="show_sql">true</property> Y2ZT.l  
%)|9E>fP]N  
r? NznNVU  
<!--指定连接的语言--> Sa?ksD2IaB  
X(]WVCu  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> Jq&uF*!  
H%UL%l$  
}Qip&IN  
<!--映射Student这个资源--> 5_I->-<  
}z _  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" />
\N!AXD  
{*0<T|<n  
\?0&0;5  
</session-factory> aqRhh=iS  
+*ZO&yJQ^<  
2ORNi,_I  
</hibernate-configuration> ]h* c,.  
75"f2;  
)Dw,q~xgg0  
(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 >/kcdWl  
=j5
MFX.-o  
(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 _=Z,E.EN  
7 %Oa;]|  
(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。 ^)(bM$(`  
&x[E;P*Fg  
(4) dialect是声明ＳＱＬ语句的方言 66/3|83Z  
KIui(n#/  
(5) show_sql定义是否显示Hibernate生成的ＳＱＬ语言，一般在调试阶段设为true,完成后再改成false，这样有利于调试。 C([phT;  
!MYSfPdS  
(6) <mapping >资源文件映射 +$C4\$t  
k7?N ?7w  
%QH)'GJQ  
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： ;1`fC@rI  
1crnmJ!C  
hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 -8eoNzut  
+Z7th7W/,  
hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 2z6yn?'&L  
PD&\LbuG  
hibernate.transaction.manager_loopup_class = SB1upTn  
vwjPmOjhS  
org.hibernate.transaction.JBossTransactionManagerLookup %_+2@\  
0f

b`08,^  
hibernate.dialect=org.hibernate.dialect.MySQLDialect "uuVy$6C