UPSERT in PostgreSQL using jOOQ

Question

I am trying to perform an UPSERT in PostgreSQL using the jOOQ library.

For doing this I am currently trying to implement the following SQL statement in jOOQ: https://stackoverflow.com/a/6527838

My code looks like this so far:

public class UpsertExecutor {

    private static final Logger logger = LoggerFactory.getLogger(UpsertExecutor.class);

    private final JOOQContextProvider jooqProvider;

    @Inject
    public UpsertExecutor(JOOQContextProvider jooqProvider) {
        Preconditions.checkNotNull(jooqProvider);

        this.jooqProvider = jooqProvider;
    }

    @Transactional
    public <T extends Record> void executeUpsert(Table<T> table, Condition condition, Map<? extends Field<?>, ?> recordValues) {
        /*
         * All of this is for trying to do an UPSERT on PostgreSQL. See:
         * https://stackoverflow.com/a/6527838
         */

        SelectConditionStep<Record1<Integer>> notExistsSelect = jooqProvider.getDSLContext().selectOne().from(table).where(condition);
        SelectConditionStep<Record> insertIntoSelect = jooqProvider.getDSLContext().select(recordValues).whereNotExists(notExistsSelect);

        try {
            int[] result = jooqProvider.getDSLContext().batch(
                jooqProvider.getDSLContext().update(table).set(recordValues).where(condition),
                jooqProvider.getDSLContext().insertInto(table).select(insertIntoSelect)
            ).execute();

            long rowsAffectedTotal = 0;
            for (int rowsAffected : result) {
                rowsAffectedTotal += rowsAffected;
            }

            if (rowsAffectedTotal != 1) {
                throw new RuntimeException("Upsert must only affect 1 row. Affected: " + rowsAffectedTotal + ". Table: " + table + ". Condition: " + condition);
            }
        } catch (DataAccessException e) {
            if (e.getCause() instanceof BatchUpdateException) {
                BatchUpdateException cause = (BatchUpdateException)e.getCause();

                logger.error("Batch update error in upsert.", cause.getNextException());
            }

            throw e;
        }
    }
}

This code does however not compile, since select() doesn't support a map of values:

SelectConditionStep<Record> insertIntoSelect = jooqProvider.getDSLContext().select(recordValues).whereNotExists(notExistsSelect);

The Question

How do I provide select() with a set of predefined values like this: SELECT 3, 'C', 'Z'?

Update 1

I managed to get the code working. Here is the complete class:

public class UpsertExecutor {

    private static final Logger logger = LoggerFactory.getLogger(UpsertExecutor.class);

    private final JOOQContextProvider jooqProvider;

    @Inject
    public UpsertExecutor(JOOQContextProvider jooqProvider) {
        Preconditions.checkNotNull(jooqProvider);

        this.jooqProvider = jooqProvider;
    }

    @Transactional
    public <T extends Record> void executeUpsert(Table<T> table, Condition condition, List<FieldValue<Field<?>, ?>> recordValues) {
        /*
         * All of this is for trying to do an UPSERT on PostgreSQL. See:
         * https://stackoverflow.com/a/6527838
         */

        Map<Field<?>, Object> recordValuesMap = new HashMap<Field<?>, Object>();
        for (FieldValue<Field<?>, ?> entry : recordValues) {
            recordValuesMap.put(entry.getFieldName(), entry.getFieldValue());
        }

        List<Param<?>> params = new LinkedList<Param<?>>();
        for (FieldValue<Field<?>, ?> entry : recordValues) {
            params.add(val(entry.getFieldValue()));
        }

        List<Field<?>> fields = new LinkedList<Field<?>>();
        for (FieldValue<Field<?>, ?> entry : recordValues) {
            fields.add(entry.getFieldName());
        }

        SelectConditionStep<Record1<Integer>> notExistsSelect = jooqProvider.getDSLContext().selectOne().from(table).where(condition);
        SelectConditionStep<Record> insertIntoSelect = jooqProvider.getDSLContext().select(params).whereNotExists(notExistsSelect);

        try {
            int[] result = jooqProvider.getDSLContext().batch(
                jooqProvider.getDSLContext().update(table).set(recordValuesMap).where(condition),
                jooqProvider.getDSLContext().insertInto(table, fields).select(insertIntoSelect)
            ).execute();

            long rowsAffectedTotal = 0;
            for (int rowsAffected : result) {
                rowsAffectedTotal += rowsAffected;
            }

            if (rowsAffectedTotal != 1) {
                throw new RuntimeException("Upsert must only affect 1 row. Affected: " + rowsAffectedTotal + ". Table: " + table + ". Condition: " + condition);
            }
        } catch (DataAccessException e) {
            if (e.getCause() instanceof BatchUpdateException) {
                BatchUpdateException cause = (BatchUpdateException)e.getCause();

                logger.error("Batch update error in upsert.", cause.getNextException());
            }

            throw e;
        }
    }
}

It does however not feel very clean with the List<FieldValue<Field<?>, ?>> recordValues parameter. Any better ideas on how to do this?

Answer 1

jOOQ 3.7+ supports PostgreSQL 9.5's ON CONFLICT clause:

• https://github.com/jOOQ/jOOQ/issues/4299
• http://www.postgresql.org/docs/9.5/static/sql-insert.html

The full PostgreSQL vendor-specific syntax is not yet supported, but you can use the MySQL or H2 syntax, which can both be emulated using PostgreSQL's ON CONFLICT:

MySQL INSERT .. ON DUPLICATE KEY UPDATE:

DSL.using(configuration)
   .insertInto(TABLE)
   .columns(ID, A, B)
   .values(1, "a", "b")
   .onDuplicateKeyUpdate()
   .set(A, "a")
   .set(B, "b")
   .execute();

H2 MERGE INTO ..

DSL.using(configuration)
   .mergeInto(TABLE, A, B, C)
   .values(1, "a", "b")
   .execute();