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在spring中使用Hibernate5

2019年09月02日  | 移动技术网IT编程  | 我要评论

目录

1. overview

in this article, we’ll discuss how to bootstrap hibernate 5 with spring, using both java and xml configuration.

2. spring integration

bootstrapping a sessionfactory with the native hibernate api is a bit complicated and would take us quite a few lines of code (have a look at the in case you really need to do that).

fortunately, spring supports bootstrapping the sessionfactory – so that we only need a few lines of java code or xml configuration.

also, before we jump in, if you’re working with older versions of hibernate, you can have a look at the articles about hibernate 3 as well as hibernate 4 with spring.

3. maven dependencies

let’s get started by first adding the necessary dependencies to our pom.xml:

<dependency>
    <groupid>org.hibernate</groupid>
    <artifactid>hibernate-core</artifactid>
    <version>5.4.2.final</version>
</dependency>

the spring-orm module provides the spring integration with hibernate:

<dependency>
    <groupid>org.springframework</groupid>
    <artifactid>spring-orm</artifactid>
    <version>5.1.6.release</version>
</dependency>

for the sake of simplicity, we’ll use h2 as our database:

<dependency>
    <groupid>com.h2database</groupid> 
    <artifactid>h2</artifactid>
    <version>1.4.197</version>
</dependency>

finally, we are going to use tomcat jdbc connection pooling, which fits better for production purposes than the drivermanagerdatasource provided by spring:

<dependency>
    <groupid>org.apache.tomcat</groupid>
    <artifactid>tomcat-dbcp</artifactid>
    <version>9.0.1</version>
</dependency>

4. configuration

as mentioned before, spring supports us with bootstrapping the hibernate sessionfactory.

all we have to do is to define some beans as well as a few parameters.

with spring, we have two options for these configurations, a java-based and an xml-based way.

4.1. using java configuration

for using hibernate 5 with spring, little has changed since hibernate 4: we have to use localsessionfactorybeanfrom the package org.springframework.orm.hibernate5 instead of org.springframework.orm.hibernate4.

like with hibernate 4 before, we have to define beans for localsessionfactorybean, datasource, and platformtransactionmanager, as well as some hibernate-specific properties.

let’s create our hibernateconfig class to configure hibernate 5 with spring:

@configuration
@enabletransactionmanagement
public class hibernateconf {
 
    @bean
    public localsessionfactorybean sessionfactory() {
        localsessionfactorybean sessionfactory = new localsessionfactorybean();
        sessionfactory.setdatasource(datasource());
        sessionfactory.setpackagestoscan(
          {"com.baeldung.hibernate.bootstrap.model" });
        sessionfactory.sethibernateproperties(hibernateproperties());
 
        return sessionfactory;
    }
 
    @bean
    public datasource datasource() {
        basicdatasource datasource = new basicdatasource();
        datasource.setdriverclassname("org.h2.driver");
        datasource.seturl("jdbc:h2:mem:db;db_close_delay=-1");
        datasource.setusername("sa");
        datasource.setpassword("sa");
 
        return datasource;
    }
 
    @bean
    public platformtransactionmanager hibernatetransactionmanager() {
        hibernatetransactionmanager transactionmanager
          = new hibernatetransactionmanager();
        transactionmanager.setsessionfactory(sessionfactory().getobject());
        return transactionmanager;
    }
 
    private final properties hibernateproperties() {
        properties hibernateproperties = new properties();
        hibernateproperties.setproperty(
          "hibernate.hbm2ddl.auto", "create-drop");
        hibernateproperties.setproperty(
          "hibernate.dialect", "org.hibernate.dialect.h2dialect");
 
        return hibernateproperties;
    }
}

4.2. using xml configuration

as a secondary option, we can also configure hibernate 5 with an xml-based configuration:

<?xml version="1.0" encoding="utf-8"?>
<beans xmlns="...">
 
    <bean id="sessionfactory"
      class="org.springframework.orm.hibernate5.localsessionfactorybean">
        <property name="datasource"
          ref="datasource"/>
        <property name="packagestoscan"
          value="com.baeldung.hibernate.bootstrap.model"/>
        <property name="hibernateproperties">
            <props>
                <prop key="hibernate.hbm2ddl.auto">
                    create-drop
                </prop>
                <prop key="hibernate.dialect">
                    org.hibernate.dialect.h2dialect
                </prop>
            </props>
        </property>
    </bean>
 
    <bean id="datasource"
      class="org.apache.tomcat.dbcp.dbcp2.basicdatasource">
        <property name="driverclassname" value="org.h2.driver"/>
        <property name="url" value="jdbc:h2:mem:db;db_close_delay=-1"/>
        <property name="username" value="sa"/>
        <property name="password" value="sa"/>
    </bean>
 
    <bean id="txmanager"
      class="org.springframework.orm.hibernate5.hibernatetransactionmanager">
        <property name="sessionfactory" ref="sessionfactory"/>
    </bean>
</beans>

as we can easily see, we’re defining exactly the same beans and parameters as in the java-based configuration earlier.

to bootstrap the xml into the spring context, we can use a simple java configuration file if the application is configured with java configuration:

@configuration
@enabletransactionmanagement
@importresource({"classpath:hibernate5configuration.xml"})
public class hibernatexmlconf {
    //
}

alternatively, we can simply provide the xml file to the spring context, if the overall configuration is purely xml.

5. usage

at this point, hibernate 5 is fully configured with spring, and we can inject the raw hibernate sessionfactory directly whenever we need to:

public abstract class barhibernatedao {
 
    @autowired
    private sessionfactory sessionfactory;
 
    // ...
}

6. supported databases

unfortunately, the hibernate project doesn’t exactly provide an official list of supported databases.

that being said, it’s easy to see if a particular database type might be supported, we can have a look at the .

7. conclusion

in this quick tutorial, we configured spring with hibernate 5 – with both java and xml configuration.

as always, the full source code of the examples is available over on github.

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