[英]Jooq reactive fetching using r2dbc driver
我的查询看起来像(使用 JOOQ v 3.15):
override fun getCredentialsById(id: Long): Mono<UserCredentialsModel> {
return Mono.from {
dsl.select(
USER_CREDENTIALS.ID,
USER_CREDENTIALS.EMAIL,
USER_CREDENTIALS.PHONE,
USER_CREDENTIALS.LOGIN,
USER_CREDENTIALS.PASSWORD)
.from(USER_CREDENTIALS)
.where(USER_CREDENTIALS.ID.eq(id))
.and(USER_CREDENTIALS.IS_ACTIVE.eq(true))
.fetchInto(UserCredentialsModel::class.java)
}
}
JOOQ 配置:
@Bean
fun createContext(): DSLContext {
return DSL.using(connection)
}
其中connection
是io.r2dbc.spi.ConnectionFactory
我得到一个例外:
org.jooq.exception.DetachedException: Attempt to execute a blocking method (e.g. Query.execute() or ResultQuery.fetch()) when only an R2BDC ConnectionFactory was configured
然后我应该如何以反应式将我的查询结果提取到 Kotlin 数据类(或 Java JOOQ 的 POJO)中?
没有测试我会说它应该是
return Mono.from(
dsl.select(
USER_CREDENTIALS.ID,
USER_CREDENTIALS.EMAIL,
USER_CREDENTIALS.PHONE,
USER_CREDENTIALS.LOGIN,
USER_CREDENTIALS.PASSWORD)
.from(USER_CREDENTIALS)
.where(USER_CREDENTIALS.ID.eq(id))
.and(USER_CREDENTIALS.IS_ACTIVE.eq(true)));
当被动地使用 jOOQ 时,你不应该调用任何阻塞方法,比如ResultQuery.fetchOneInto(Class)
。 该方法只是ResultQuery.fetchOne()
和Record.into(Class)
的便捷方法。 没有什么能阻止你自己调用Record.into(Class)
,无论是在阻塞世界还是非阻塞世界。
因此,使用您常用的反应器库方法来映射流内容:
mono.map { r -> r.into(UserCredentialsModel::class.java) }
或者,在一个完整的例子中:
return Mono.from {
dsl.select(
USER_CREDENTIALS.ID,
USER_CREDENTIALS.EMAIL,
USER_CREDENTIALS.PHONE,
USER_CREDENTIALS.LOGIN,
USER_CREDENTIALS.PASSWORD)
.from(USER_CREDENTIALS)
.where(USER_CREDENTIALS.ID.eq(id))
.and(USER_CREDENTIALS.IS_ACTIVE.eq(true))
} .map { r -> r.into(UserCredentialsModel::class.java) }
你可以试试 .toMono().subscribe()
dsl.select(
USER_CREDENTIALS.ID,
USER_CREDENTIALS.EMAIL,
USER_CREDENTIALS.PHONE,
USER_CREDENTIALS.LOGIN,
USER_CREDENTIALS.PASSWORD)
.from(USER_CREDENTIALS)
.where(USER_CREDENTIALS.ID.eq(id))
.and(USER_CREDENTIALS.IS_ACTIVE.eq(true))
.fetchInto(UserCredentialsModel::class.java)
.toMono().subscribe()
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