JPA Method
in javax.persistence.criteria.CriteriaBuilder

Expression<String> substring(
  Expression<String> x, 
  Expression<Integer> from, 
  Expression<Integer> len
)

Create an expression for substring extraction. Extracts a substring of given length starting at the specified position. First position is 1.
Parameters:
x - string expression
from - start position expression
len - length expression
Return:
expression corresponding to substring extraction
Since:
JPA 2.0