| 1600 PMP mock questions | 1400 CAPM mock questions | 800 SCJP 6 mock questions | 600 OCAJP 7 mock questions | 590 OCPJP 7 mock questions | 556 SCWCD 5 mock questions | 500 OCEJWCD 6 mock questions | pdfDownload (java,struts, hibernet etc) | JobsJobs and Walkins |
|
Java online test
JSP online test ORACLE online test Hibernate online test Servlet online test Struts online test EJB online test C online test C++ online test Aptitude online test |
Difference between session.save() , session.saveOrUpdate() and session.persist()? |
|
|
session.save() : Save does an insert and will fail if the primary key is already persistent.
session.saveOrUpdate() : saveOrUpdate does a select first to determine if it needs to do an insert or an update. Insert data if primary key not exist otherwise update data. session.persist() : Does the same like session.save(). But session.save() return Serializable object but session.persist() return void. session.save() returns the generated identifier (Serializable object) and session.persist() doesn't. For Example : if you do :- System.out.println(session.save(question)); This will print the generated primary key. if you do :- System.out.println(session.persist(question)); Compile time error because session.persist() return void. |
Suggested JobsMore Jobs >> |
|
Online Practice TestJava online testJSP online test ORACLE online test Hibernate online test Servlet online test Struts online test EJB online test C online test C++ online test Aptitude online test |
