title: updating multiple rows using JPA
body: <p>I want to update all fields of a table that has value of colum NAME as 'PCNAME'.
  The table name which i want to update is XYZ.I want to update only some fields and not keep some unchanged.</p>
  
  <p>This will affect many rows and not a single row as there will be many rows with NAME='PCNAME'
  How can  i do it using JPA.I have entity class associated with this table.</p>