查询在奎尔在运行时崩溃的语法错误

Question

相关片段：

case class Video(
    id: String, 
    title: String, 
    url: String, 
    pictureUrl: String, 
    publishedAt: Date, 
    channel: String, 
    duration: Option[String], 
    createdOn: Date 
) 

“连接”到DB工作，从预期的结果视频台返回选择。我有储蓄的问题，这个简单的方法：

def saveToCache(item: Video): Unit = { 
    logger.trace(item) 
    import ctx._ 
    val x = quote { 
     val lItem = lift(item) 
     val fromDb = query[Video].filter(_.id == lItem.id) 
     if (fromDb.isEmpty) query[Video].insert(lItem) 
     else fromDb.update(lItem) 
    } 
    logger.trace(x.ast) 
    run(x) 
    } 

崩溃在运行时用（缩短）：

CASE WHEN NOT EXISTS (SELECT x3.* FROM video x3 WHERE x3.id = ?) THEN INSERT INTO video (id,title,url,picture_url,published_at,channel,duration,created_on) VALUES (?, ?, ?, ?, ?, ?, ?, ?) ELSE UPDATE video SET id = ?, title = ?, url = ?, picture_url = ?, published_at = ?, channel = ?, duration = ?, created_on = ? WHERE id = ? END 

我想：

11:14:06.640 [scala-execution-context-global-84] ERROR io.udash.rpc.AtmosphereService - RPC request handling failed 
org.sqlite.SQLiteException: [SQLITE_ERROR] SQL error or missing database (near "CASE": syntax error) 
     at org.sqlite.core.DB.newSQLException(DB.java:909) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.core.DB.newSQLException(DB.java:921) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.core.DB.throwex(DB.java:886) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.core.NativeDB.prepare_utf8(Native Method) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.core.NativeDB.prepare(NativeDB.java:127) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.core.DB.prepare(DB.java:227) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.core.CorePreparedStatement.<init>(CorePreparedStatement.java:41) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.jdbc3.JDBC3PreparedStatement.<init>(JDBC3PreparedStatement.java:30) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.jdbc4.JDBC4PreparedStatement.<init>(JDBC4PreparedStatement.java:19) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.jdbc4.JDBC4Connection.prepareStatement(JDBC4Connection.java:48) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.jdbc3.JDBC3Connection.prepareStatement(JDBC3Connection.java:263) ~[sqlite-jdbc-3.18.0.jar:na] 
     at org.sqlite.jdbc3.JDBC3Connection.prepareStatement(JDBC3Connection.java:235) ~[sqlite-jdbc-3.18.0.jar:na] 
     at com.zaxxer.hikari.pool.ProxyConnection.prepareStatement(ProxyConnection.java:317) ~[HikariCP-2.7.2.jar:na] 
     at com.zaxxer.hikari.pool.HikariProxyConnection.prepareStatement(HikariProxyConnection.java) ~[HikariCP-2.7.2.jar:na] 
     at io.getquill.context.jdbc.JdbcContext.$anonfun$executeAction$1(JdbcContext.scala:98) ~[quill-jdbc_2.12-2.2.0.jar:2.2.0] 
     at io.getquill.context.jdbc.JdbcContext.$anonfun$executeAction$1$adapted(JdbcContext.scala:97) ~[quill-jdbc_2.12-2.2.0.jar:2.2.0] 
     at io.getquill.context.jdbc.JdbcContext.$anonfun$withConnection$1(JdbcContext.scala:46) ~[quill-jdbc_2.12-2.2.0.jar:2.2.0] 
     at scala.Option.getOrElse(Option.scala:121) ~[scala-library-2.12.2.jar:1.0.0-M1] 
     at io.getquill.context.jdbc.JdbcContext.withConnection(JdbcContext.scala:44) ~[quill-jdbc_2.12-2.2.0.jar:2.2.0] 
     at io.getquill.context.jdbc.JdbcContext.executeAction(JdbcContext.scala:97) ~[quill-jdbc_2.12-2.2.0.jar:2.2.0] 

从宏观编译过程中相关的输出

启用日志记录查询，但我不知道如何去做（Quill文档只是说了一些关于SLF4J的信息，这对我来说是无用的信息 - 我没有看到任何日志，我不知道要在SLF4J中搜索什么内容OCS）。

到目前为止，我对Quill感到非常失望 - 第一次在使用默认排序类型时，它会生成无效的排序查询，现在这个。

Answer 1

你应该重写你的查询：

import ctx._ 
def saveToCache(item: Video): Unit = { 
    if (ctx.run(query[Video].filter(_.id == lift(item.id)).isEmpty)) 
    ctx.run(query[Video].insert(lift(item))) 
    else ctx.run(query[Video].filter(_.id == lift(item.id)).update(lift(item))) 
() 
} 

因为quote必须包含将被编译成一个单一的查询表达式。 此代码将编译为三个查询。

但更好地利用优化的版本：

import ctx._ 
def saveToCacheOptimized(item: Video): Unit = { 
    if (ctx.run(query[Video].filter(_.id == lift(item.id)).update(lift(item))) == 0) 
    ctx.run(query[Video].insert(lift(item))) 
() 
} 

其编译成两个查询。

Quill使用SLF4J进行日志记录，您应该阅读本项目文档。启用日志记录，你应该添加一些日志记录的后端，例如，logback：

libraryDependencies ++= Seq(
    "ch.qos.logback" % "logback-classic" % "1.2.3" 
) 

应该为刚刚记录的查询是不够的。