hibernate连接池

1．Hibernate默认连接池 V-O(U*]  
i\}:hU-U  
<?xml version='1.0' encoding='UTF-8'?> iAO5"(>}?  
MEZ{j%-a  
<!DOCTYPE hibernate-configuration KJhNJ  
2i=H"('G)+  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Jcf"#u-Q/  
P8yIegPY  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> C"<s/
h  
TvhJVVQ+?  
N0TeqOi4Y  
<hibernate-configuration> Iq5pAHm>M6  
b}
z
`BRCc  
6Y*;{\Rd  
<session-factory > 70W"G X&  
Va<HU:<  
jRZ%}KX  
<!?JDBC驱动程序--> 0NE{8O0;Fr  
~9o6 W",  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> lPq\=
V  
oY9FK{  
U..<iNQE5  
<!-- 连接数据库的URL--> [IX+M#mf  
`H%G3M0a  
<property name="connection.url"> >=,uau7  

0~A#>R'
 
jdbc:mysql://localhost:3306/schoolproject 8QgA@y"  
xh9qg0d  
</property> I+?hG6NM  
rs8\)\z  
<property name="connection.useUnicode">true</property> B&KL2&Z~Pq  
{ShgJ;! Q  
<property name="connection.characterEncoding">UTF-8</property> f4t.f*#  
Un=a fX?j  
+Ghi}v  
<!--连接的登录名--> Q s(Bnb;  
y=N"=Z  
<property name="connection.username">root</property> #*$p-I=  
 !rL<5L  
kE
N#u  
<!?登录密码--> %CH6lY=lI  
$^%N U  
<property name="connection.password"></property> 0%C^8%(x  
C0C0GqN,  
8v_C5d\  
<!--是否将运行期生成的SQL输出到日志以供调试--> x1[?5n6  
wrv5V M}  
<property name="show_sql">true</property> W:s@L#-  
**;p(CI  
7} O;FX+x  
<!--指定连接的语言--> eD#XDK  
[I+9dSM1t  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 'ig, ATY  
_9If/RD  
gT52G?-  
<!--映射Student这个资源--> 4YA./j%'  
P~7.sM  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> H[&@}v,L  
>IvBUM[Rt  
VV3}]GjC  
</session-factory> QTJu7^O9  
JJk#,AP  
`u'dh{,gE  
</hibernate-configuration> D_D,t8_Y  
e<+<lj"  
!c(QSf502  
2．C3P0连接配置 d,#.E@Po  
b5`KB75sbo  
<?xml version='1.0' encoding='UTF-8'?> c.K =(y*  
nYw\'c  
<!DOCTYPE hibernate-configuration C8b''9t.  
?[1SiJT  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" +oy*Kxs7  
;Rnhe_A.  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> QApyP CH  
BSUPS+@+  
T_hV%
 
<hibernate-configuration> !C&%T]  
Z5)eREi=  
R 1zC.m  
<session-factory > 7>.OVh<  
! q6hC  
`lCuU~~ag  
<!?JDBC驱动程序--> I0w%8bs  
Gp2!xKgm  
<property name="connection.driver_class">com.mysql.jdbc.Driver</property> lgD]{\O$ip  
8I#D`yVKc  
+<(a}6dt  
<!-- 连接数据库的URL--> &^QPkX@p  
AlX3Wv}  
<property name="connection.url"> :=!Mh}i  
DdjCn`jqlf  
jdbc:mysql://localhost:3306/schoolproject 2<6j1D^jM  
Z7#7N wy4  
</property> Os&1..$Nb  
 H!eh J$[  
<property name="connection.useUnicode">true</property> -Zy)5NB-tZ  
o:\XRPB  
<property name="connection.characterEncoding">UTF-8</property> x-Z^Q C  
9D_wG\g  
7`Du5>b8  
<!--连接的登录名--> _/x&<,3  
5P+YK\~  
<property name="connection.username">root</property> 'EX4.h a5  
tY_5Pz(@
 
UzQ$B>f  
<!--登录密码--> avNLV  
PdE>@0X?M  
<property name="connection.password"></property> FmT `Oa>  
Mtp%co)f  
esq<xuZM4  
<!-- C3P0连接池设定--> 6Z
c)
0I'  
lo:~aJ8  
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider Bymny>.M  
^Q2ZqAf^a  
</property> 7'.s7& '7  
eE3-t/=  
<property name="hibernate.c3p0.max_size">20</property> OlGR<X  
tgN92Q.i6T  
<property name="hibernate.c3p0.min_size">5</property> #5{sglC"|F  
j%xBo:
 
<property name="hibernate.c3p0.timeout">120</property> Bw-s6MS  
K2|7%  
<property name="hibernate.c3p0.max_statements">100</property> &oN/_7y  
fM":f| G  
<property name="hibernate.c3p0.idle_test_period">120</property> P|}\/}{`  
E+{5-[Zc*$  
<property name="hibernate.c3p0.acquire_increment">2</property> *zQOJsg"e  
l>Av5g)  
K-@bwB7~s  
<!--是否将运行期生成的SQL输出到日志以供调试--> M,..Kw/ }~  
l%PnB )F  
<property name="show_sql">true</property> %$9:e J?  
wZ>Y<0,  
=J3`@9;  
<!--指定连接的语言--> ,cQA*;6  
yQ-hnlzn~  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> Wo3'd|Y~i  
n~%}Z[5D  
<%?uYCD  
<!--映射Student这个资源--> Bbs 0v6&,  
[4gjC  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> z93nYY$`Y  
;&mxqY8`'  
6ZgNHARS  
</session-factory> ZNy9_a:dX  
I9/KM4&  
%UG/ak%
z  
</hibernate-configuration> )E~mJln  
taV|YP$  
F@^N|;_2  
PP4d?+;V  
3．proxool连接池 5"2@NL  
=1Sy@MbH3  
(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 MBO,\t.  
;tr)=)q&  
Rp4FXR jC  
<?xml version="1.0" encoding="UTF-8"?> gMay  
9:\A7 =  
<!-- the proxool configuration can be embedded within your own application's. DpNX66O  
O3xz|&xY&  
Anything outside the "proxool" tag is ignored. --> BvJ\x)  
^0eO\wc?O  
ybYXD?  
<something-else-entirely> a
m(#Fa  
J/[7d?hI/  
<proxool> .b~OMTHuvM  
*h])mqhB  
<!--连接池的别名--> @>Ek'~m  
Xj;2h{#s  
<alias>DBPool</alias> kPedX
  
ZIy(<0  
d~/xGB`<  
<!--proxool只能管理由自己产生的连接--> o@',YF>OQ  
s kY0\V  
<driver-url> H<z30r/-w  
Di])<V  
jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 pLo;#e8'f  
m9I(TOw  
</driver-url> v?{vg?vI  
c}'Xoc  
<!?JDBC驱动程序--> 8xgc[#  
l]>!`'sJL  
<driver-class>com.mysql.jdbc.Driver</driver-class> |
is 9  
Crg#6k1~EN  
<driver-properties> ~=F
k/  
QU%N*bFW%P  
<property name="user" value="root"/> Ks51:M  
'Ye]eL,I\  
<property name="password" value=""/> F]0Jwm{  
WS5"!vz   
</driver-properties> -BjEL;  
/rOnm=P+Q  
`U!(cDY  
<!-- 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 )2toL5Q  
*.,8,e8Vq  
收,超时的销毁--> Es:5yX!  
~Ji>[#W K  
<house-keeping-sleep-time>90000</house-keeping-sleep-time> WQTe
ndS  
du8!3I  
epYj+T  
<!-- 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 sI4QI\*4  
wNbTM.@  
用户连接就不会被接受--> P2|}*h5(  
g\qX7nIH?  
<maximum-new-connections>20</maximum-new-connections> jigbeHRy  
y]MWd#U  
[ns&Y0Y`t  
<!-- 最少保持的空闲连接数--> ^Jn|*?+l  
<G&WYk%u*  
<prototype-count>5</prototype-count> ~V!EtZG$  
z3ZuC{  
 L2k;f]  
<!-- 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 Y'?Iznb  
uH=Gt^_  
等待请求数由maximum-new-connections决定--> \2(MpB\_6!  
Fr<Pe&dn  
<maximum-connection-count>100</maximum-connection-count> 0:HC;J  
;g6 nHek  
V02309Y  
<!-- 最小连接数--> ?DJuQFv  
1XQ87~  
<minimum-connection-count>10</minimum-connection-count> )!BB/'DRQ  
gca|
?tt  
s!bHS_\e|  
</proxool> Q4#\{" N!  
#T Z!#,q  
</something-else-entirely> 3SmqXPOw  
7Zhli Y1  
|_!PD$i-  
(2)配置hibernate.cfg.xml文件 ER/\ +Z#Z  
B>1M$3`E  
<?xml version='1.0' encoding='UTF-8'?> 0H;"5  
|WQD=J%~(  
<!DOCTYPE hibernate-configuration oJhEHx[f  
hcj{%^p  
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" {E3;r7  
4;08n|C  
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> {|G&W^`  
)x y9X0  
?exALv'B  
<hibernate-configuration> ><MGZ?-N  
"pR $cS  
<<i=+ed8eP  
<session-factory > >qr=l,Hi  
F>p%2II/  
[''=><  
<property name="hibernate.connection.provider_class"> Mf!owpW T  
,^Ex}Z  
org.hibernate.connection.ProxoolConnectionProvider B[C7G7<B  
bBd*}"v^"  
</property> RJQ/y3  
>:="?'N5l!  
<property name="hibernate.proxool.pool_alias">DBPool</property> g]:..W7  
V=:,]fTr  
<property name="hibernate.proxool.xml">proxoolconf.xml</property> 4&#vU(-H  
r7zf+a]  
\ro~-n+o  
<!--是否将运行期生成的SQL输出到日志以供调试--> Ufyxw5u5F  
Z?v
Y3)  
<property name="show_sql">true</property> lv*Wnn@k  
&pa)Ee>  
I #Arr#%  
<!--指定连接的语言--> s9^"wN YQ  
xKRfl1  
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> F^4*|g  
KB$ vQ@N  
;""-[4C  
<!--映射Student这个资源--> =iA"; x  
*C,$W\6sz  
<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> 1Al=v  
:DF`A(  
;Of?fe5:  
</session-factory> 4
yJ01s  
D7 8)4>X  
Z?.:5#  
</hibernate-configuration> jFI]54,  
EuhF$L1  
37GHt9l  
(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 &QiAM`MbC=  
/ nC$?w  
(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 :/I={)5  
y}.y,\S0  
(3) hibernate.proxool.xml是向Hibernate声明连接池的配置文件位置，可以用相对或绝对路径，用相对路径时要注意一定在要Path范围内！不然会抛出异常。 P#M<CG9  
e!O &~#'h}  
(4) dialect是声明ＳＱＬ语句的方言 1K
fJl S+  
So3,Z'z=  
(5) show_sql定义是否显示Hibernate生成的ＳＱＬ语言，一般在调试阶段设为true,完成后再改成false，这样有利于调试。 KyVe0>{_u  
 uhPIV
\  
(6) <mapping >资源文件映射 w
pPxEp/  
c/,|[t  
>rQ)|W=i  
4． JNDI连接池，数据源已经由应用服务配置好(如Web服务器)，Hibernate需要做的只是通过JNDI名查找到此数据源。应用服务器将连接池对外显示为JNDI绑定数据源，它是javax.jdbc.Datasource类的一个实例。只要配置一个Hibernate文件，如： [C*Xk{e  
ZVC
v(J  
hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 JC1BUheeb  
?Vb=4B{~  
hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory ^^U)WB  
@DjG?yLK$  
hibernate.transaction.manager_loopup_class = ~XN]?5GQf  
GcU(:V2o  
org.hibernate.transaction.JBossTransactionManagerLookup 3@#,i<ge:  
-0[>}!l=G  
hibernate.dialect=org.hibernate.dialect.MySQLDialect <ZN) /,4PS