CODEWITHSUNDEEP
javasqlderbyauto-increment
luigivampa
luigivampa

Reputation: 397

How to auto increment database column in Java derby?

Here's the SQL I've tried so far to create the table

CREATE TABLE tblPosts (nId INTEGER PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
strContent VARCHAR(140) NOT NULL,
strLink VARCHAR(200),
strImage VARCHAR(200));

using 

String sql = "INSERT INTO tblPosts VALUES ('" + textFieldContent.getText() + "', '" + 

textFieldLink.getText() + "', '" + textFieldImage.getText() + "')";

I get an error telling me I'm not providing the nId column value which I'm not but if the column auto-increments I'm not supposed to right?

I've also tried using the IDE to create the table on the database as described here

Alter a table column with auto increment by 1 in derby

Same response though. Any suggestions?

Upvotes: 4

Views: 10213

Answers (3)

ABFovox
ABFovox

Reputation: 39

You need to set THAT auto_increment column to DEFAULT like this:

String sql = "INSERT INTO tblPosts VALUES ( DEFAULT, '" + textFieldContent.getText() + "', '" + 

textFieldLink.getText() + "', '" + textFieldImage.getText() + "')";

Upvotes: 0

kelvin andre
kelvin andre

Reputation: 415

You need to include Start with 1, Increment by 1 Like this

CREATE TABLE tblPosts (nId INTEGER PRIMARY KEY GENERATED ALWAYS AS IDENTITY(Start with 1, Increment by 1), 
strContent VARCHAR(140) NOT NULL, 
strLink VARCHAR(200)

Upvotes: 5

Steve Smith
Steve Smith

Reputation: 2270

I would guess that since you're not specifying the column names in the SELECT, it is getting confused as to which columns the data should go in. I would specify the column names in your INSERT command.

Upvotes: 1

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