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January 30, 2013 03:21
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JEE EJB - Mybatis example
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package example.jee6mybatis; | |
import javax.ejb.EJB; | |
import javax.ejb.Stateless; | |
@Stateless | |
public class Client { | |
@EJB SessionWrapper mybatis; | |
public void myBusinessMethod() { | |
String result = mybatis.selectOne("my.supersecret.mapped.statemet"); | |
} | |
} |
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package example.jee6mybatis; | |
import java.sql.Connection; | |
import javax.annotation.PostConstruct; | |
import javax.ejb.Singleton; | |
import org.apache.ibatis.session.SqlSession; | |
import org.apache.ibatis.session.SqlSessionFactory; | |
import org.apache.ibatis.session.SqlSessionFactoryBuilder; | |
@Singleton | |
public class SessionFactoryWrapper { | |
private SqlSessionFactory factory; | |
@PostConstruct | |
public void init() { | |
factory = <builder code>; | |
} | |
public SqlSession getSession(Connection con) { | |
return factory.openSession(con); | |
} | |
} |
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package example.jee6mybatis; | |
import java.sql.SQLException; | |
import javax.annotation.Resource; | |
import javax.ejb.EJB; | |
import javax.ejb.EJBException; | |
import javax.ejb.Stateless; | |
import javax.sql.DataSource; | |
import org.apache.ibatis.session.SqlSession; | |
@Stateless | |
public class SessionWrapper { | |
@EJB | |
SessionFactoryWrapper factory; | |
@Resource (mappedName="java:/MyDataSource") | |
DataSource ds; | |
// Example interceptable wrapped method | |
public <T> T selectOne(String statement) { | |
try { | |
SqlSession s = factory.getSession(ds.getConnection()); | |
T result = s.selectOne(statement); | |
s.close(); | |
return result; | |
} catch (SQLException ex) { | |
throw new EJBException(ex); | |
} | |
} | |
} |
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How to use the Transaction manger if the EJB container is running on another JVM
In my Ejb I m calling many other ejb methods so how to rollback automatically if one fails.