我有带有 Hibernate 作为 DAL 的 Java (Axis2) webservice。使用 InnoDB 作为 MySql 引擎。
关于性能我有几个问题： 1. 通常抓取速度很快，但时间可能会有所不同，有时查询时间太长？通常需要时间查询的是以下查询： 1 获取用户信息的 Web 服务请求 - 我们在用户表上执行此操作，进行搜索 - “名称如 . 1 获取用户食谱的 Web 服务请求（查询食谱，其中 r.user. userId == userId, userId在webservice中给出） 2.如何配置c3p0连接池以获得最佳性能？
这取自 hibernate.cfg
<property name="connection.autoReconnect">true</property>
<property name="connection.autoReconnectForPools">true</property>
<property name="connection.is-connection-validation-required">true</property>
<property name="hibernate.connection.zeroDateTimeBehavior">convertToNull</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<property name="hibernate.show_sql">false</property>
<property name="hibernate.current_session_context_class">thread</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.use_sql_comments">true</property>
<property name="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.min_size">3</property>
<property name="hibernate.c3p0.max_size">50</property>
<property name="hibernate.c3p0.timeout">280</property>
<property name="hibernate.c3p0.max_statements">50</property>
<!-- this property forces the revalidation of a connection after the given amount of time (in secs) -->
<!-- it must be set to LESS than the wait_timout setting for the mysql server (this setting defaults to 28800 secs (8 hours)) -->
<property name="hibernate.c3p0.idle_test_period">300</property>
以下是调用 2 个方法时使用的 hbm.xml 文件……这是 user.hbm.xml：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 21:48:14 27/03/2012 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="com.icdb.data.User" table="user" catalog="yoavDB">
<id name="userid" type="java.lang.Integer">
<column name="userid" />
<generator class="identity" />
</id>
<property name="birthdate" type="string">
<column name="birthdate" length="50" not-null="true" />
</property>
<property name="password" type="string">
<column name="password" length="100" not-null="true" />
</property>
<property name="firstname" type="string">
<column name="firstname" length="50" not-null="true" />
</property>
<property name="lastname" type="string">
<column name="lastname" length="50" not-null="true" />
</property>
<property name="country" type="string">
<column name="country" length="100" not-null="true" />
</property>
<property name="email" type="string">
<column name="email" length="100" not-null="true" />
</property>
<property name="numOfRecipes" type="int">
<column name="numOfRecipes" not-null="true" />
</property>
<property name="picUrl" type="string">
<column name="picUrl" length="200" />
</property>
<property name="rate" type="float">
<column name="rate" precision="12" scale="0" not-null="true" />
</property>
<property name="fewWords" type="string">
<column name="fewWords" length="200" not-null="true" />
</property>
<property name="whatscooking" type="string">
<column name="whatscooking" length="45" not-null="true" />
</property>
<set name="usermessagesesForSenderUserId" table="usermessages" inverse="true" lazy="true" fetch="select">
<key>
<column name="senderUserId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Usermessages" />
</set>
<set name="usermessagesesForUserId" table="usermessages" inverse="true" lazy="true" fetch="select">
<key>
<column name="userId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Usermessages" />
</set>
<set name="timelines" table="timeline" inverse="true" lazy="true" fetch="select">
<key>
<column name="userId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Timeline" />
</set>
<set name="generaltipses" table="generaltips" inverse="true" lazy="true" fetch="select">
<key>
<column name="authorid" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Generaltips" />
</set>
<set name="userlastvisitsForVisitedUserId" table="userlastvisit" inverse="true" lazy="true" fetch="select">
<key>
<column name="visitedUserId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Userlastvisit" />
</set>
<set name="recipes" table="recipe" inverse="true" lazy="true" fetch="select">
<key>
<column name="ownerid" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Recipe" />
</set>
<set name="userlikeses" table="userlikes" inverse="true" lazy="true" fetch="select">
<key>
<column name="userId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Userlikes" />
</set>
<set name="friendshiptablesForUserBId" table="friendshiptable" inverse="true" lazy="true" fetch="select">
<key>
<column name="userB_Id" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Friendshiptable" />
</set>
<set name="usersForFavUserId" table="userfavchefsync" inverse="true" lazy="true" fetch="select">
<key>
<column name="userId" not-null="true" />
</key>
<many-to-many entity-name="com.icdb.data.User">
<column name="favUserId" not-null="true" />
</many-to-many>
</set>
<set name="friendshiptablesForUserAId" table="friendshiptable" inverse="true" lazy="true" fetch="select">
<key>
<column name="userA_Id" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Friendshiptable" />
</set>
<set name="usersForUserId" table="userfavchefsync" inverse="true" lazy="true" fetch="select">
<key>
<column name="favUserId" not-null="true" />
</key>
<many-to-many entity-name="com.icdb.data.User">
<column name="userId" not-null="true" />
</many-to-many>
</set>
<set name="activitylogsForObjectUserId" table="activitylog" inverse="true" lazy="true" fetch="select">
<key>
<column name="objectUserId" />
</key>
<one-to-many class="com.icdb.data.Activitylog" />
</set>
<set name="userlastvisitsForGuestUserId" table="userlastvisit" inverse="true" lazy="true" fetch="select">
<key>
<column name="guestUserId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Userlastvisit" />
</set>
<set name="userrecipessyncs" table="userrecipessync" inverse="true" lazy="true" fetch="select">
<key>
<column name="userId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Userrecipessync" />
</set>
<set name="activitylogsForUserId" table="activitylog" inverse="true" lazy="true" fetch="select">
<key>
<column name="userId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Activitylog" />
</set>
<set name="recipereviews" table="recipereview" inverse="true" lazy="true" fetch="select">
<key>
<column name="reviewerid" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Recipereview" />
</set>
</class>
</hibernate-mapping>
这是 recipe.hbm.xml：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 21:48:14 27/03/2012 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="com.icdb.data.Recipe" table="recipe" catalog="yoavDB">
<id name="recipeid" type="java.lang.Integer">
<column name="recipeid" />
<generator class="identity" />
</id>
<many-to-one name="user" class="com.icdb.data.User" fetch="select">
<column name="ownerid" not-null="true" />
</many-to-one>
<property name="releasedate" type="timestamp">
<column name="releasedate" length="19" not-null="true" />
</property>
<property name="preparationtime" type="int">
<column name="preparationtime" not-null="true" />
</property>
<property name="recipedifficulty" type="int">
<column name="recipedifficulty" not-null="true" />
</property>
<property name="name" type="string">
<column name="name" length="50" not-null="true" unique="true" />
</property>
<property name="description" type="string">
<column name="description" length="200" />
</property>
<property name="lastupdated" type="timestamp">
<column name="lastupdated" length="19" not-null="true" />
</property>
<property name="servecount" type="java.lang.Integer">
<column name="servecount" />
</property>
<property name="complete" type="boolean">
<column name="complete" not-null="true" />
</property>
<property name="category" type="int">
<column name="category" not-null="true" />
</property>
<property name="numOfViews" type="int">
<column name="numOfViews" not-null="true" />
</property>
<property name="indexOfRecipeOfUser" type="int">
<column name="indexOfRecipeOfUser" not-null="true" />
</property>
<property name="picUrl" type="string">
<column name="picUrl" length="200" />
</property>
<property name="numOfLikes" type="int">
<column name="numOfLikes" not-null="true" />
</property>
<property name="calculatedRate" type="float">
<column name="calculatedRate" precision="12" scale="0" not-null="true" />
</property>
<set name="userlastvisits" table="userlastvisit" inverse="true" lazy="true" fetch="select">
<key>
<column name="lastViewedRecipeId" />
</key>
<one-to-many class="com.icdb.data.Userlastvisit" />
</set>
<set name="recipeingredients" table="recipeingredient" inverse="true" lazy="true" fetch="select">
<key>
<column name="recipeid" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Recipeingredient" />
</set>
<set name="recipereviews" table="recipereview" inverse="true" lazy="true" fetch="select">
<key>
<column name="recipeid" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Recipereview" />
</set>
<set name="userlikeses" table="userlikes" inverse="true" lazy="true" fetch="select">
<key>
<column name="recipeId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Userlikes" />
</set>
<set name="activitylogs" table="activitylog" inverse="true" lazy="true" fetch="select">
<key>
<column name="objectRecipeId" />
</key>
<one-to-many class="com.icdb.data.Activitylog" />
</set>
<set name="userrecipessyncs" table="userrecipessync" inverse="true" lazy="true" fetch="select">
<key>
<column name="recipeId" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Userrecipessync" />
</set>
<set name="recipeinstructions" table="recipeinstruction" inverse="true" lazy="true" fetch="select">
<key>
<column name="recipeid" not-null="true" />
</key>
<one-to-many class="com.icdb.data.Recipeinstruction" />
</set>
</class>
</hibernate-mapping>
友谊表：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 21:48:14 27/03/2012 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="com.icdb.data.Friendshiptable" table="friendshiptable" catalog="yoavDB">
<composite-id name="id" class="com.icdb.data.FriendshiptableId">
<key-property name="userAId" type="int">
<column name="userA_Id" />
</key-property>
<key-property name="userBId" type="int">
<column name="userB_Id" />
</key-property>
</composite-id>
<many-to-one name="userByUserAId" class="com.icdb.data.User" update="false" insert="false" fetch="select">
<column name="userA_Id" not-null="true" />
</many-to-one>
<many-to-one name="userByUserBId" class="com.icdb.data.User" update="false" insert="false" fetch="select">
<column name="userB_Id" not-null="true" />
</many-to-one>
<property name="status" type="short">
<column name="status" not-null="true" />
</property>
<property name="statusLastChangedDate" type="date">
<column name="statusLastChangedDate" length="10" not-null="true" />
</property>
</class>
</hibernate-mapping>
最后访问：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 21:48:14 27/03/2012 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="com.icdb.data.Userlastvisit" table="userlastvisit" catalog="yoavDB">
<composite-id name="id" class="com.icdb.data.UserlastvisitId">
<key-property name="guestUserId" type="int">
<column name="guestUserId" />
</key-property>
<key-property name="visitedUserId" type="int">
<column name="visitedUserId" />
</key-property>
</composite-id>
<many-to-one name="userByVisitedUserId" class="com.icdb.data.User" update="false" insert="false" fetch="select">
<column name="visitedUserId" not-null="true" />
</many-to-one>
<many-to-one name="userByGuestUserId" class="com.icdb.data.User" update="false" insert="false" fetch="select">
<column name="guestUserId" not-null="true" />
</many-to-one>
<many-to-one name="recipe" class="com.icdb.data.Recipe" fetch="select">
<column name="lastViewedRecipeId" />
</many-to-one>
<property name="lastVisitTimeStamp" type="timestamp">
<column name="lastVisitTimeStamp" length="19" not-null="true" />
</property>
</class>
</hibernate-mapping>
获取用户信息的 Java 代码：
public String[] getUserInfo( int visitingUserId,
int visitedUserId )
{
Session session = ICDBHibernateUtil.getSessionFactory().getCurrentSession();
try
{
session.beginTransaction();
User user = (User) session.get(User.class, visitedUserId);
ArrayList<String> ret = new ArrayList<String>();
// Username
ret.add( user.getFirstname() + " " + user.getLastname() );
// Few words
ret.add( user.getFewWords() );
// Num of recipes
ret.add( Integer.toString( user.getNumOfRecipes() ) );
// Calculated Rank
ret.add( Float.toString( user.getRate() ) );
// Pic url
ret.add( user.getPicUrl() );
FriendshiptableId id = new FriendshiptableId( visitingUserId, visitedUserId );
Friendshiptable ft = (Friendshiptable)session.get( Friendshiptable.class, id );
if( ft == null )
{
id = new FriendshiptableId( visitedUserId, visitingUserId );
ft = (Friendshiptable)session.get( Friendshiptable.class, id );
if( ft == null )
{
ret.add( "none" );
}
else
{
FriendshipRequestStatusEnum status = FriendshipRequestStatusEnum.values()[ ft.getStatus() ];
switch( status )
{
case PENDING:
ret.add( "pending" );
break;
case ACCEPTED:
ret.add( "accepted" );
break;
case DECLINED:
ret.add( "declined" );
break;
}
}
}
else
{
FriendshipRequestStatusEnum status = FriendshipRequestStatusEnum.values()[ ft.getStatus() ];
switch( status )
{
case PENDING:
ret.add( "pending" );
break;
case ACCEPTED:
ret.add( "accepted" );
break;
case DECLINED:
ret.add( "declined" );
break;
}
}
if( visitingUserId != -1 )
{
// Has new stuff....
UserlastvisitId ulvId = new UserlastvisitId( visitingUserId, visitedUserId );
Userlastvisit ulv = (Userlastvisit) session.get( Userlastvisit.class, ulvId );
if( ulv == null )
{
// Lets add a new entry
User visitingUser = (User) session.load( User.class, visitingUserId );
User visitedUser = (User) session.load( User.class, visitedUserId );
ulv = new Userlastvisit( ulvId,
visitingUser,
visitedUser,
new Date() );
session.save( ulv );
ret.add( "true" );
}
else
{
List<?> loginResult= session.createQuery("from Recipe r where r.lastupdated >= :lastVisited" )
.setDate( "lastVisited", ulv.getLastVisitTimeStamp() )
.list();
if( loginResult.size() > 0 )
{
ret.add( "true" );
}
else
{
ret.add( "false" );
}
// We need to update the last visit time...
ulv.setLastVisitTimeStamp( new Date() );
session.save( ulv );
}
}
session.getTransaction().commit();
String[] retStr = new String[ret.size()];
ret.toArray( retStr );
return retStr;
}
catch( RuntimeException e )
{
ICDBHibernateUtil.getSessionFactory().getCurrentSession().getTransaction().rollback();
throw e;
}
}
getuserRecipes 方法：
public String[] getUserRecipesNew( int visitingUserId,
int userId,
int pageNumber )
{
final int PAGE_SIZE = 20;
Session session = ICDBHibernateUtil.getSessionFactory().getCurrentSession();
try
{
session.beginTransaction();
String hql = "from Recipe r where r.user.userid= :userid";
Query query = session.createQuery( hql )
.setInteger( "userid", userId );
query = query.setFirstResult( PAGE_SIZE * (pageNumber - 1) );
query.setMaxResults( PAGE_SIZE );
List<?> recipes = query.list();
ArrayList<String> ret = new ArrayList<String>();
if( recipes.size() == PAGE_SIZE )
{
// Indicates that might be more results
ret.add( "true" );
}
else
{
// No more results
ret.add( "false" );
}
DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
// Format the Recipes into string
for( int i = 0; i < recipes.size(); i++ )
{
UserlikesId userLikeId = new UserlikesId( userId, ((Recipe)recipes.get(i)).getRecipeid() );
Userlikes userLike = (Userlikes) session.get( Userlikes.class, userLikeId );
ret.add( Integer.toString( ((Recipe)recipes.get(i)).getRecipeid() ) );
ret.add( ((Recipe)recipes.get(i)).getName() );
ret.add( ((Recipe)recipes.get(i)).getDescription() );
ret.add( ((Recipe)recipes.get(i)).getUser().getFirstname() + ((Recipe)recipes.get(i)).getUser().getLastname() );
ret.add( Integer.toString( ((Recipe)recipes.get(i)).getRecipedifficulty() ) );
ret.add( Integer.toString( ((Recipe)recipes.get(i)).getServecount() ) );
ret.add( Integer.toString( ((Recipe)recipes.get(i)).getPreparationtime() ) );
ret.add( Integer.toString( ((Recipe)recipes.get(i)).getUser().getUserid() ) );
ret.add( Integer.toString( ((Recipe)recipes.get(i)).getNumOfViews() ) );
ret.add( df.format( ((Recipe)recipes.get(i)).getReleasedate() ) );
ret.add( (((Recipe)recipes.get(i)).getPicUrl() == null) ? "" : ((Recipe)recipes.get(i)).getPicUrl() );
ret.add( Integer.toString( ((Recipe)recipes.get(i)).getCategory() ) );
ret.add( (userLike==null)?"0":(userLike.isIsLike()?"1":"0") );
ret.add( Integer.toString( ((Recipe)recipes.get(i)).getNumOfLikes() ) );
}
session.getTransaction().commit();
String[] retStr = new String[ret.size()];
ret.toArray( retStr );
return retStr;
}
catch( RuntimeException e )
{
ICDBHibernateUtil.getSessionFactory().getCurrentSession().getTransaction().rollback();
throw e;
}
}
一切都写好了吗？应该如何调整它以获得更好的性能？