How to retrieve previously auto-generated PK ID value using JDBC and HSQLDB

Question

I\'m working with JDBC and HSQLDB 2.2.9. What\'s the most efficient and accurate way to insert a new row into a DB and, subsequently, retain its id (PK set to a

Answer 1

I don't have enough reputation to comment on neizan's answer, but here's how I solved the same problem:

• The column looked like an ID column, but it wasn't defined as IDENTITY;
• As said above, you need to specify RETURN_GENERATED_KEYS.
• It looks like if you execute 2 INSERT in sequence, the second one won't return the generated keys. Use "CALL IDENTITY()" instead.

Example using HSQLDB 2.2.9:

CREATE TABLE MY_TABLE (
 ID INTEGER IDENTITY,
 NAME VARCHAR(30)
)

Then in Java:

PreparedStatement result = cnx.prepareStatement(
    "INSERT INTO MY_TABLE(ID, NAME) VALUES(NULL, 'TOM');",
    RETURN_GENERATED_KEYS);
int updated = result.executeUpdate();
if (updated == 1) {
    ResultSet generatedKeys = result.getGeneratedKeys();
    if (generatedKeys.next()) {
        int key = generatedKeys.getInt(1);
    }
}

Answer 2

Not much action here, so I'll go ahead and answer to bring closure to this question. After playing around with the different options, and after see this question, I was able to get my option 3 to work. Like I mentioned in the edit to my question, I'm going to use option 3. Option 4 also worked fine, but since the accepted answer to the linked question is given by a reputable source, I am sticking with that. I wish I'd have seen that question/answer before starting this one, I'd have saved some time!