spring - What is purpose of using cascade={CascadeType.TYPE_NAME} -

i going through spring project , in model classes there type

cascade={cascadetype.all}

written in parameters eg: ,

@manytoone(fetch = fetchtype.eager,cascade=cascadetype.all) @joincolumn(name="user_id", nullable=false)

private user user;

my question in purpose should use ?

thanky you.

this attribute means (because cascadetype.all) operations associated objects of class (outer class) executed associated object of class user (inner class).

for example:

@entity public class group {  @manytoone(fetch = fetchtype.eager, cascade=cascadetype.all) @joincolumn(name="user_id", nullable=false) private user user` 

if try remove group db cause removing of associated user.

enum cascadetype specify kind of operations want perform associated user.

if want specify cascading execution removing , persist have that:

@manytoone(cascade = {cascadetype.remove, cascadetype.persist}, fetch = fetchtype.eager)