About substring
Strings in JPQL and Criteria Queries
Explains string expressions in JPQL queries, including LIKE, LOCATE, LOWER, UPPER, TRIM, CONCAT and SUBSTRING.... CONCAT - String Concatenation SUBSTRING - Getting a Portion of a String Java String Methods ... The LOCATE(str, substr [, start]) function searches a substring and returns its position. For example: ...
substring(x, from)
Create an expression for substring extraction.(Method of javax.persistence.criteria.CriteriaBuilder)
substring(x, from)
Create an expression for substring extraction.(Method of javax.persistence.criteria.CriteriaBuilder)
substring(x, from, len)
Create an expression for substring extraction.(Method of javax.persistence.criteria.CriteriaBuilder)
substring(x, from, len)
Create an expression for substring extraction.(Method of javax.persistence.criteria.CriteriaBuilder)
substring works with string but not with char
i want to select all entities whose name starts with a specific letter, i can use this query with a string parameter select f from Foo f where substring(f.name, 1, 1) = ?1 but when i use a char, the query does not return anything. i think it should also be possible to use char/Character types, do you agree? ... parameter SELECT f FROM Foo f WHERE substring ( f . name , 1 , 1 ) = ? 1 ...
substring(x, from, len)
Create an expression for substring extraction.(Method of javax.persistence.criteria.CriteriaBuilder)
javax.persistence.criteria.CriteriaBuilder
Used to construct criteria queries, compound selections, expressions, predicates, orderings.(Interface of JPA)
JPA Query Expressions (JPQL / Criteria)
Describes JPA query (JPQL / Criteria API) expressions (literals, operators and functions).... See JavaDoc Reference Page... , substring substring(x, from) CriteriaBuilder's method Create an expression ...
GROUP BY and HAVING clauses
Explains how to use the GROUP BY and HAVING clauses in a JPA/JPQL query.... all the countries by their first letter: SELECT SUBSTRING ( c . name , 1 , 1 ) FROM Country c GROUP BY SUBSTRING ( c . name , 1 , 1 ) ; The FROM ...
