java.sql.SQLException: Table 'CONNECTIONS' does not have an auto-generated column named 'connection_id'

Question

I'm trying to retreive the connection_id column while inserting into Connections table. I have a table being generated at the start of the application like this with the column_id being auto generated.

CREATE TABLE connections (connection_ID INT not null primary key GENERATED ALWAYS AS IDENTITY(START WITH 1, INCREMENT BY 1), 
connection_name VARCHAR(100) unique not null, user_name VARCHAR(100) not null, password VARCHAR (100) not null, server_url 
VARCHAR(100) not null, port_number VARCHAR(10) not null), 

I'm using the following statement to retrieve the liat of connection_ids

PreparedStatement stmt = dbconn.prepareStatement(insertString, new String[] {"connection_id"});

But I get the following exception even though my connection_id is auto-generated,

java.sql.SQLException: Table 'CONNECTIONS' does not have an auto-generated column named 'connection_id'.

Answer 1

Use the PreparedStatement.RETURN_GENERATED_KEYS instead of new String[] {"ID_colname"} - see a_horse_with_no_name's answer to this question:

Retrieve id of record just inserted into a Java DB (Derby) database

For example:

PreparedStatement ps = connection.prepareStatement("insert .... ", PreparedStatement.RETURN_GENERATED_KEYS);
ps.executeUpdate();
ResultSet results = ps.getGeneratedKeys();

I have just had the same problem (8 years later!) and 'this works for me'.

I don't know why the new String[] {"ID_colname"} doesn't work, but at least there is this alternative to try.

Answer 2

I do not have much experience with Java DB, but I hope this will help.
Maybe what you need is to make the auto generated keys returnable. Check the Java DB Reference Manual and the Connection class definition