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substring works with string but not with char

(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? chris ... ) is Character. In ObjectDB as in Java char

DiscriminatorType.CHAR

Enum Constant javax.persistence.DiscriminatorTypeCHAR Single character

Strings in JPQL and Criteria Queries

and Trailing Characters The TRIM([[LEADING|TRAILING|BOTH] [char] FROM] str)(param); // TRIM([[LEADING|TRAILING|BOTH] [char] FROM] str) char_Expression_">trim

ObjectDB Object Database Features

(boolean, byte, short, char, int, long, float, double). char, int, long, float and double). Wrappers (Boolean, Byte

javax.persistence.criteria.CriteriaBuilder

JPA 2 JavaDoc Reference Documentation - Used to construct criteria queries, compound selections, expressions, predicates, orderings.

JPA Persistable Types

, byte, short, char, int, long

FROM clause (JPQL / Criteria API)

reserved words: ABS, ALL, AND, ANY, AS, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, BY, CASE, CHAR

Index Definition

>, short, char, int, long, float,

Database Schema Evolution

this context numeric types are: byte, short, char, int

[ODB1] Chapter 7 - JDOQL Queries

> , ... char ... , char, int, long, float, doublebyte, short, char, int