使用 UUID 作为主键时"Data conversion error converting" H2 内存中数据库错误

Question

使用 UUID 作为主键与 H2 内存中数据库的 Slick 一起使用时，我遇到了以下错误。我已经尝试调试了几天，但没有运气：

Data conversion error converting "00000000-0000-0000-0000-000000000001"

下面是可以重现此问题的代码：

import java.util.UUID
import slick.driver.H2Driver.api._
import scala.concurrent.Await
import scala.concurrent.duration.Duration
object Main {
  class Tasks(tag: Tag) extends Table[(String, Option[UUID])](tag, "tasks") {
    def name: Rep[String] = column[String]("name")
    def id = column[UUID]("id", O.SqlType("UUID"), O.PrimaryKey, O.AutoInc)
    def * = (name, id ?)
  }
  def main(args: Array[String]) {
    val db = Database.forURL("jdbc:h2:mem:test;MODE=PostgreSQL", driver = "org.h2.Driver")
    try {
      val tasks = TableQuery[Tasks]
      println("Create table: " + tasks.schema.create.statements.mkString("|"))
      val setupAction: DBIO[Unit] = DBIO.seq(
        tasks.schema.create,
        tasks.+=("foo", None)
      )
      Await.result(db.run(setupAction), Duration.Inf)
    } finally db.close
  }
}

任何人都可以在这里提供一些帮助吗？

---更新---

表创建查询如下所示：

create table "tasks" (
  "name" VARCHAR                                              NOT NULL,
  "id"   UUID GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL PRIMARY KEY
);

全栈跟踪如下所示：

Exception in thread "main" org.h2.jdbc.JdbcSQLException: Data conversion error converting "00000000-0000-0000-0000-000000000001"; SQL statement:
insert into "tasks" ("name")  values (?) [22018-187]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)
    at org.h2.message.DbException.get(DbException.java:168)
    at org.h2.value.Value.convertTo(Value.java:902)
    at org.h2.value.Value.getLong(Value.java:443)
    at org.h2.table.Column.updateSequenceIfRequired(Column.java:339)
    at org.h2.table.Column.validateConvertUpdateSequence(Column.java:331)
    at org.h2.table.Table.validateConvertUpdateSequence(Table.java:737)
    at org.h2.command.dml.Insert.insertRows(Insert.java:151)
    at org.h2.command.dml.Insert.update(Insert.java:114)
    at org.h2.command.CommandContainer.update(CommandContainer.java:78)
    at org.h2.command.Command.executeUpdate(Command.java:254)
    at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:157)
    at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:143)
    at slick.driver.JdbcActionComponent$InsertActionComposerImpl$SingleInsertAction$$anonfun$run$7.apply(JdbcActionComponent.scala:507)
    at slick.driver.JdbcActionComponent$InsertActionComposerImpl$SingleInsertAction$$anonfun$run$7.apply(JdbcActionComponent.scala:504)
    at slick.jdbc.JdbcBackend$SessionDef$class.withPreparedStatement(JdbcBackend.scala:347)
    at slick.jdbc.JdbcBackend$BaseSession.withPreparedStatement(JdbcBackend.scala:407)
    at slick.driver.JdbcActionComponent$InsertActionComposerImpl.preparedInsert(JdbcActionComponent.scala:498)
    at slick.driver.JdbcActionComponent$InsertActionComposerImpl$SingleInsertAction.run(JdbcActionComponent.scala:504)
    at slick.driver.JdbcActionComponent$SimpleJdbcDriverAction.run(JdbcActionComponent.scala:32)
    at slick.driver.JdbcActionComponent$SimpleJdbcDriverAction.run(JdbcActionComponent.scala:29)
    at slick.dbio.DBIOAction$$anon$4$$anonfun$run$3.apply(DBIOAction.scala:214)
    at slick.dbio.DBIOAction$$anon$4$$anonfun$run$3.apply(DBIOAction.scala:214)
    at scala.collection.Iterator$class.foreach(Iterator.scala:727)
    at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
    at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
    at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
    at slick.dbio.DBIOAction$$anon$4.run(DBIOAction.scala:214)
    at slick.dbio.DBIOAction$$anon$4.run(DBIOAction.scala:212)
    at slick.backend.DatabaseComponent$DatabaseDef$$anon$2.liftedTree1$1(DatabaseComponent.scala:237)
    at slick.backend.DatabaseComponent$DatabaseDef$$anon$2.run(DatabaseComponent.scala:237)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NumberFormatException: For input string: "00000000-0000-0000-0000-000000000001"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Long.parseLong(Long.java:589)
    at java.lang.Long.parseLong(Long.java:631)
    at org.h2.value.Value.convertTo(Value.java:854)
    ... 31 more

Answer 1

你有一个奇怪的"create table"语句，其序列类型为 UUID。没有数据库支持这一点。例如，您需要使用：

create table tasks (
  name VARCHAR NOT NULL,
  id UUID DEFAULT RANDOM_UUID() NOT NULL PRIMARY KEY
);
insert into tasks(name) values('Hello');
select * from tasks;

但是随机生成的主键很慢，我建议回到常规序列。

附言这里问了同样的问题：https://github.com/h2database/h2database/issues/303

Answer 2

除了托马斯的回答，另一种选择是将类型从uuid更改为begint：

create table "tasks" (
  "name" VARCHAR                                                NOT NULL,
  "id"   BIGINT GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL PRIMARY KEY
);

当表由 Slick/Hibernate/等生成时，您可能无法编写自己的 SQL。更改类型可能是可行的替代方案。