休眠/SQLException：字段没有默认值

Question

mySQL Table generated using:

CREATE TABLE `actors` (
    `actorID` INT(11) NOT NULL,
    `actorName` VARCHAR(255) NOT NULL,
     PRIMARY KEY AUTO_INCREMENT (actorID)
);

Mapped class:

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "actorID", length = 11, unique = true, nullable = false)
private int actorID;
....

Error:

ERROR: Field 'actorID' doesn't have a default value

This error is hit when trying to create a new Actor object, and saving it to the database.

I've tried using other generation strategies, and dropping/rebuilding tables / entire database, as per the answers to similar questions. No luck so far.

Thank you for your time, Samuel Smith

EDIT: Dropping the table and recreating it using the SQL syntax shown by shippi seemed to solve the problem for me.

Answer 1

Just try to use

@GeneratedValue(strategy=GenerationType.AUTO)
@Id
@Column(name = "actorID")
private int actorID;

This should fix your issue. Leave the actorID null if saving.

Ensure also that the DB works fine, try to write an insert statement without inserting the ID and lets see whether the pure insert is working. If the direct insert is working to the database you could start to troubleshoot hibernate.

And a small point, I use to define the PH and Auto increment in the same line where defining the column:

actorID INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,

but it should work either way.

Answer 2

Your error is in your table definition.

Must be:

CREATE TABLE `actors` (
   `actorID` INT(11) NOT NULL AUTO_INCREMENT,
   `actorName` VARCHAR(255) NOT NULL,
   PRIMARY KEY AUTO_INCREMENT (actorID)
);

You missed AUTO_INCREMENT in actorID.

Answer 3

I had the same issue, Solved it empty the entire database to empty and re run the application. Everything is no working fine.