How to set default boolean value in JPA

Question

I have an attribute

private boolean include;

I would like to set its default value to true, so that in the database it must display True from d

Answer 1

If you have defined default values in your database, you can choose the column annotation, and as parameter you use insertable = false, in this way when inserting a value it will choose the one that you marked by default in the database. Example: In MySQL I have a person table with a status attribute of boolean type and it has by default the value true. In your java class it would look like this:

//....
public class Person implements Serializable {
    //.....
    @Column(insertable = false)
    private Boolean status;
    //...
}

You can have more information about the column annotation HERE, it is well explained and it helped me a lot.

Answer 2

Using JPA 2.1 and Oracle 11 this works for me by using Oracle type NUMBER of size 1:

Java:

@Column(name = "ENABLED", nullable = false)
private boolean enabled = true;

Create SQL script:

CREATE TABLE "ACCOUNT"(
"ID" NUMBER(10,0) NOT NULL ENABLE,
"NAME" VARCHAR2(255 CHAR) NOT NULL ENABLE,
"PASSWORD" VARCHAR2(255) NOT NULL ENABLE,
"ENABLED" NUMBER(1,0) DEFAULT 1 NOT NULL ENABLE,
PRIMARY KEY ("ID")
);

Answer 3

I've found that adding in the constructor is a good workaround to default new entities to a value:

public EntityName(){
    this.fieldToDefault = default;
}

Answer 4

Maybe will be useful for people who work with Microsoft SQL SERVER

    @Column(columnDefinition="bit default 0")
    private Boolean active;

Possible values: 0 or 1

Answer 5

private boolean include = true;

Answer 6

For PostgreSQL you can use boolean in definition

@Column(name = "isDeleted", columnDefinition = "boolean default true")
private boolean isDeleted = true;