使用jOOQ在PostgreSQL中进行UPSERT

Question

我正在尝试使用jOOQ库在PostgreSQL中执行UPSERT.

为此,我目前正在尝试在jOOQ中实现以下SQL语句:https://stackoverflow.com/a/6527838

到目前为止我的代码看起来像这样:

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;
        }
    }
}

但是这段代码没有编译,因为select()不支持值映射:

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

问题

如何为select()提供一组预定义的值,如下所示:SELECT 3, 'C', 'Z'？

更新1

我设法使代码工作.这是完整的课程:

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;
        }
    }
}

但是List<FieldValue<Field<?>, ?>> recordValues参数确实不太干净.有关如何做到这一点的更好的想法？

Answer 1

jOOQ 3.7+支持PostgreSQL 9.5的ON CONFLICT子句:

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

尚不支持完整的PostgreSQL供应商特定语法,但您可以使用MySQL或H2语法,这两种语法都可以使用PostgreSQL进行模拟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();

Answer 2

这是一个upsert实用程序方法,它源自上面针对UpdatableRecord对象的Lucas解决方案:

public static int upsert(final DSLContext dslContext, final UpdatableRecord record) {
    return dslContext.insertInto(record.getTable())
                     .set(record)
                     .onDuplicateKeyUpdate()
                     .set(record)
                     .execute();
}

}

Answer 3

受到 JOOQ 3.11、Kotlin 和 PostgreSQL DSL 的 @ud3sh 评论的启发

upsert这是直接在UpdatableRecord对象上调用的扩展函数

import org.jooq.UpdatableRecord

internal fun UpdatableRecord<*>.upsert(): Int {
    if(this.configuration() == null) {
        throw NullPointerException("Attach configuration to record before calling upsert")
    }
    return this.configuration().dsl().insertInto(this.getTable()).set(this).onConflict().doUpdate().set(this).execute()
}