Scala 使用slick play2普通SQL将记录插入事务中的3个表时出现异常

我的设想如下：

在我的PG DB中有3个表（用户、安全、密码）

当最终用户试图将self注册到我的数据库中时，代码将检查用户表中是否存在该用户

如果存在，只需返回一个None。否则，将记录插入同一事务中的（用户、安全、密码）

以下是我的代码：

def selectUserCountQuery1(user: User): DBIO[Int] = {
  sql"""SELECT COUNT(user_id) FROM users WHERE provider_id = ${user.providerId} AND phone_num = ${user.phoneNumber}""".as[Int].head
}


def insertUserQuery(user: User): DBIO[Int] = {
    sqlu"""INSERT INTO users VALUES (${user.userId}, ${user.deviceToken},${user.phoneNumber},${user.providerId},
        ${user.gender},${user.email},${user.createTime},${user.loginName},${user.nickName},${user.currentPlatform},${user.roles},${user.avatarUrl})"""
}

def insertPasswordQuery(passwordInfo: PasswordInfo): DBIO[Int] = {
  sqlu"""INSERT INTO password_info VALUES (${passwordInfo.userId}, ${passwordInfo.hasher},
         ${passwordInfo.passwordHash}, ${passwordInfo.salt})"""
}

def insertSecurityTokenQuery(accessToken: UserSecurityToken): DBIO[Int] = {
  sqlu"""INSERT INTO user_security_token VALUES (${accessToken.userId}, ${accessToken.platform},
         ${accessToken.token}, ${accessToken.token_time})"""
}


def registerUser (user: User, password: String): Future[Option[UserProfile]] = {
  val passwordHash = MD5PasswordGenerator.generateMD5WithEncoder(password)
  val passwordInfo : PasswordInfo = PasswordInfo(user.userId, Some("MD5"), passwordHash, Some(""))
  val tokenStr: String = JwtTokenSecurity.jwtTokenString(user.userId, user.currentPlatform)
  val accessToken : UserSecurityToken = UserSecurityToken(user.userId, user.currentPlatform, tokenStr, 1)

  val actions = for {
    count <- selectUserCountQuery1(user) if count == 0
    status1 <- insertUserQuery(user)
    status2 <- insertPasswordQuery(passwordInfo)
    status3 <- insertSecurityTokenQuery(accessToken)
  } yield(count)

  db.run(actions.transactionally).map {
    count  => count match {
      case 0 => Some(UserProfile.user2UserProfile(user, passwordInfo, accessToken))
      case _ => None
    }
  }
}

这太奇怪了，如果我去掉了保护条件（count==0），也没有例外。但是用户信息会不断地插入到数据库中

---

有专家帮我吗

防护

DBIO.withFilter

的工作方式类似于

Future.withFilter

：不匹配谓词会导致

NoTouchElementException

失败

相反，您可以使用

flatMap

执行分支：

val actions = selectUserCountQuery1(user).flatMap {
  case 0 => for {
    status1 <- insertUserQuery(user)
    status2 <- insertPasswordQuery(passwordInfo)
    status3 <- insertSecurityTokenQuery(accessToken)
  } yield 0

  case n => DBIO.successful(n)
}

db.run(actions.transactionally).map {
  case 0 => Some(UserProfile.user2UserProfile(user, passwordInfo, accessToken))
  case _ => None
}

val actions=selectUserCountQuery1（用户）.flatMap{
案例0=>{
状态1无
}

val actions = selectUserCountQuery1(user).flatMap {
  case 0 => for {
    status1 <- insertUserQuery(user)
    status2 <- insertPasswordQuery(passwordInfo)
    status3 <- insertSecurityTokenQuery(accessToken)
  } yield 0

  case n => DBIO.successful(n)
}

db.run(actions.transactionally).map {
  case 0 => Some(UserProfile.user2UserProfile(user, passwordInfo, accessToken))
  case _ => None
}