Top "Orm" questions

How to fix the Hibernate "object references an unsaved transient instance - save the transient instance before flushing" error

I receive following error when I save the object using Hibernate object references an unsaved transient instance - save the …

java hibernate jpa orm entity

What's the difference between JPA and Hibernate?

I understand that JPA 2 is a specification and Hibernate is a tool for ORM. Also, I understand that Hibernate has …

java hibernate jpa jakarta-ee orm

Difference between FetchType LAZY and EAGER in Java Persistence API?

I am a newbie to Java Persistence API and Hibernate. What is the difference between FetchType.LAZY and FetchType.EAGER …

java hibernate jpa orm java-persistence-api

Hibernate show real SQL

if I set <property name="show_sql">true</property> in my hibernate.cfg.xml configuration file …

java sql hibernate orm

What's the difference between @JoinColumn and mappedBy when using a JPA @OneToMany association

What is the difference between: @Entity public class Company { @OneToMany(cascade = CascadeType.ALL , fetch = FetchType.LAZY) @JoinColumn(name = "companyIdRef", referencedColumnName = "…

java hibernate jpa orm one-to-many

How to fix org.hibernate.LazyInitializationException - could not initialize proxy - no Session

I get the following exception: Exception in thread "main" org.hibernate.LazyInitializationException: could not initialize proxy - no Session at …

java hibernate session orm lazy-loading

What is the "N+1 selects problem" in ORM (Object-Relational Mapping)?

The "N+1 selects problem" is generally stated as a problem in Object-Relational mapping (ORM) discussions, and I understand that it …

orm select-n-plus-1

Conversion of a datetime2 data type to a datetime data type results out-of-range value

I've got a datatable with 5 columns, where a row is being filled with data then saved to the database via …

c# sql-server entity-framework datetime orm

How to print a query string with parameter values when using Hibernate

Is it possible in Hibernate to print generated SQL queries with real values instead of question marks? How would you …

java sql hibernate orm

How to select specific columns in laravel eloquent

lets say I have 7 columns in table, and I want to select only two of them, something like this SELECT `…

laravel laravel-5 orm eloquent