CREATE TABLE customers
(
first_name character varying(15),
second_name character varying(20),
login character varying(15) NOT NULL,
password character varying(15),
email character varying(40),
gender gender,
register_date date,
date_of_birth date,
address character varying(40),
address_number integer,
town character varying(20),
CONSTRAINT login PRIMARY KEY (login)
)
I have this table and I created an enum of gender such as:
CREATE TYPE gender AS ENUM ( 'F', 'M',);
I am trying to insert into customers data from eclipse java with PreparedStatement but there is an error such as ERROR: column "gender" is of type gender but expression is of type character varying Hint: You will need to rewrite or cast the expression.
My Java code looks like:
PreparedStatement pre_state;
public enum gendertype {
F,
M;
}
pre_state = conn.prepareStatement("INSERT INTO"
+ " customers VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");
pre_state.set(6, gendertype.F.toString());
I can take no credit for this answer as you have already solved it, but I will explain why it works.
PostgreSQL provides the answer when it says
Hint: You will need to rewrite or cast the expression
The Java code is creating a string literal value that represents the Java enum gendertype type.
Casting a literal to a PostgreSQL gender type is done by adding a casting suffix to the value ::gender
.
So valid input would be
'F'::gender
or
'M'::gender
This works because all PostgreSQL types have a input method that takes a text representation and converts that to the internal form.
你的解决方案本来是
pre_state.setObject(6, gendertype.F.toString(), Types.OTHER);
In addition to other answers if you use for example createNativeQuery()
you should cast value to your enum
like cast(? as gender)
, something like that:
Person person = new Person("Gurbanguly", "Berdymukhamedov", Gender.Male)
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction = session.beginTransaction();
session.createNativeQuery("INSERT INTO Person (firstname, lastname, gender) VALUES (?,?,cast(? as gender))")
.setParameter(1, person.getFirstName())
.setParameter(2, person.getLastName())
.setParameter(3, person.getGender().toString())
.executeUpdate();
transaction.commit();
session.close(); // this statement is needed not to produce many sessions
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