本文介绍了迁移到 anorm2.4(使用 play 2.4):ToStatement[T] 和 ToStatement[Option[T]]的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
直到 play 2.3 包含异常，我可以写以下内容:
Up until the anorm included with play 2.3, I could write the following:
implicit val arbitraryClassToStatement = new ToStatement[ArbitraryClass] {
def set(
s: java.sql.PreparedStatement,
index: Int,
aValue: ArbitraryClass
)
: Unit = {
s.setString(
index,
ArbitraryClass.definingString
)
}
}
这将有助于插入
SQL("INSERT INTO SomeTable Values( {nonNullAc}, {possiblyNullAc} )" ).on(
'nonNullAc -> ArbitraryClass( "abcd" ),
'possiblyNullAc -> Option( ArbitraryClass( "abcd" ) )
)
意味着 ArbitraryClass 和 Option[ ArbitraryClass ] 都会被它满足.这似乎不再是这种情况，因为我收到以下错误:
meaning that both ArbitraryClass and Option[ ArbitraryClass ] would be satisfied by it. This seems to no longer be the case as I get the following error:
[error] found : (Symbol, Option[models.Misc.Url])
[error] (which expands to) (Symbol, Option[java.net.URL])
[error] required: anorm.NamedParameter
有人能指出我处理这个问题的正确方法吗?我想要最少的代码重复..
Can someone please point me to what's the right way to handle this? I'd want minimal duplication of code..
推荐答案
您需要创建一个 ParameterMetaData[ArbitraryClass] 才能工作
You need to create a ParameterMetaData[ArbitraryClass] for this to work
implicit object ArbitraryClassMetaData extends ParameterMetaData[ArbitraryClass] {
val sqlType = ParameterMetaData.StringParameterMetaData.sqlType
val jdbcType = ParameterMetaData.StringParameterMetaData.jdbcType
}
这里我只是重新取了ParameterMetaData[String]
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