Slick 3 java.time.LocalDate映射
我使用的是Slick 3.1.0,需要持久化java.time.LocalDate类型的字段 我有模特课:Slick 3 java.time.LocalDate映射,java,scala,date,slick,slick-3.0,Java,Scala,Date,Slick,Slick 3.0,我使用的是Slick 3.1.0,需要持久化java.time.LocalDate类型的字段 我有模特课: case class Position(companyName: String, title: String, startDate: Option[LocalDate], endDate: Option[LocalDate], positionId: Option[Int] = None) 以及以下映射: private[PositionTable] class PositionTabl
case class Position(companyName: String, title: String, startDate: Option[LocalDate], endDate: Option[LocalDate], positionId: Option[Int] = None)
以及以下映射:
private[PositionTable] class PositionTable(tag: Tag) extends Table[Position](tag, "POSITIONS") {
val positionId = column[Int]("POSITION_ID", O.PrimaryKey, O.AutoInc)
val companyName = column[String]("COMPANY_NAME")
val title = column[String]("TITLE")
val startDate = column[Date]("START_DATE")
val endDate = column[Date]("END_DATE")
def * = (companyName, title, startDate, endDate, positionId.?) <>(Position.tupled, Position.unapply)
}
private[PositionTable]类PositionTable(标记:标记)扩展表[Position](标记,“POSITIONS”){
val positionId=列[Int](“位置ID”,O.PrimaryKey,O.AutoInc)
val companyName=列[String](“公司名称”)
val title=列[字符串](“标题”)
val startDate=列[日期](“开始日期”)
val endDate=列[日期](“结束日期”)
def*=(公司名称、标题、开始日期、结束日期、职位ID.?)(Position.tuple、Position.unapply)
}
如何映射要在数据库中用日期类型表示的startDate和endDate字段
列映射器中NullPointerException的堆栈跟踪:
java.lang.NullPointerException
at com.tiedin.repo.PositionTable$class.$init$(PositionRepository.scala:54)
at repo.PositionRepositoryTest.<init>(PositionRepositoryTest.scala:13)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at java.lang.Class.newInstance(Class.java:442)
at org.scalatest.tools.Runner$.genSuiteConfig(Runner.scala:1422)
at org.scalatest.tools.Runner$$anonfun$31.apply(Runner.scala:1236)
at org.scalatest.tools.Runner$$anonfun$31.apply(Runner.scala:1235)
at scala.collection.immutable.List.map(List.scala:273)
at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:1235)
at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1011)
at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1010)
at org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:1500)
at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1010)
at org.scalatest.tools.Runner$.run(Runner.scala:850)
at org.scalatest.tools.Runner.run(Runner.scala)
at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:138)
at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
java.lang.NullPointerException
位于com.tiedin.repo.PositionTable$class.$init$(PositionRepository.scala:54)
在回购位置回购测试(PositionRepositoryTest.scala:13)
位于sun.reflect.NativeConstructorAccessorImpl.newInstance0(本机方法)
位于sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
位于java.lang.reflect.Constructor.newInstance(Constructor.java:422)
位于java.lang.Class.newInstance(Class.java:442)
位于org.scalatest.tools.Runner$.genSuiteConfig(Runner.scala:1422)
位于org.scalatest.tools.Runner$$anonfun$31.apply(Runner.scala:1236)
位于org.scalatest.tools.Runner$$anonfun$31.apply(Runner.scala:1235)
位于scala.collection.immutable.List.map(List.scala:273)
位于org.scalatest.tools.Runner$.dorunrunrun(Runner.scala:1235)
在org.scalatest.tools.Runner$$anonfun$runoptionalywithpassfailreporter$2.apply(Runner.scala:1011)
在org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply上(Runner.scala:1010)
在org.scalatest.tools.Runner$.withClassLoaderAddispatchReporter(Runner.scala:1500)上
在org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1010)上
位于org.scalatest.tools.Runner$.run(Runner.scala:850)
位于org.scalatest.tools.Runner.run(Runner.scala)
位于org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:138)
位于org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:28)
在sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法)处
位于sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
在sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)中
位于java.lang.reflect.Method.invoke(Method.java:497)
位于com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
步骤:
import java.sql.Date
import java.time.LocalDate
// other imports
class SomeDbClass {
implicit val localDateToDate = MappedColumnType.base[LocalDate, Date](
l => Date.valueOf(l),
d => d.toLocalDate
)
private[PositionTable] class PositionTable(tag: Tag) extends Table[Position](tag, "POSITIONS") {
val positionId = column[Int]("POSITION_ID", O.PrimaryKey, O.AutoInc)
val companyName = column[String]("COMPANY_NAME")
val title = column[String]("TITLE")
val startDate = column[Option[LocalDate]]("START_DATE")
val endDate = column[Option[LocalDate]]("END_DATE")
def * = (companyName, title, startDate, endDate, positionId.?) <>(Position.tupled, Position.unapply)
}
}
MappedColumnType
PositionTable
中的类型Date
更改为选项[LocalDate]
。从您的模型类判断,startDate
和endDate
可以为空。如果没有,请忽略选项
import java.sql.Date
import java.time.LocalDate
// other imports
class SomeDbClass {
implicit val localDateToDate = MappedColumnType.base[LocalDate, Date](
l => Date.valueOf(l),
d => d.toLocalDate
)
private[PositionTable] class PositionTable(tag: Tag) extends Table[Position](tag, "POSITIONS") {
val positionId = column[Int]("POSITION_ID", O.PrimaryKey, O.AutoInc)
val companyName = column[String]("COMPANY_NAME")
val title = column[String]("TITLE")
val startDate = column[Option[LocalDate]]("START_DATE")
val endDate = column[Option[LocalDate]]("END_DATE")
def * = (companyName, title, startDate, endDate, positionId.?) <>(Position.tupled, Position.unapply)
}
}
导入java.sql.Date
导入java.time.LocalDate
//其他进口
类SomeDbClass{
隐式val localDateToDate=MappedColumnType.base[LocalDate,Date](
l=>Date.valueOf(l),
d=>d.toLocalDate
)
私有[PositionTable]类PositionTable(标记:标记)扩展表[Position](标记,“POSITIONS”){
val positionId=列[Int](“位置ID”,O.PrimaryKey,O.AutoInc)
val companyName=列[String](“公司名称”)
val title=列[字符串](“标题”)
val startDate=列[选项[LocalDate]](“开始日期”)
val endDate=列[选项[LocalDate]](“结束日期”)
def*=(公司名称、标题、开始日期、结束日期、职位ID.?)(Position.tuple、Position.unapply)
}
}
当然,您可以将自定义映射列类型提取到trait中,并在其他db类中重用它们
进一步阅读:当我试图在隐式val localDateToDate被赋值的行中测试NullPointerException时,下面的代码生成NullPointerException。@IlyaZinkovich您有一个灵活的驱动程序吗?请为您的问题添加堆栈跟踪。更新了问题,添加了堆栈跟踪