scala - 程序在使用 scala 运行时可以正常工作，但在尝试使用 scalac 编译时出现编译错误

Question

我正在测试下面的代码，执行基本的数据库查询。当我使用“scala dbtest.scala”从 CLI 运行它时，它工作正常，但当我尝试使用 scalac 编译它时，它会出现编译错误:

[sean@ibmp2 pybackup]$ scalac dbtest.scaladbtest.scala:5: error: expected class or object definitionval conn_str = "jdbc:mysql://localhost:3306/svn?user=svn&password=svn"^dbtest.scala:8: error: expected class or object definitionclassOf[com.mysql.jdbc.Driver]^dbtest.scala:11: error: expected class or object definitionval conn = DriverManager.getConnection(conn_str)^dbtest.scala:12: error: expected class or object definitiontry {^four errors found

import java.sql.{Connection, DriverManager, ResultSet};
import java.util.Date

// Change to Your Database Config
val conn_str = "jdbc:mysql://localhost:3306/svn?user=xx&password=xx"

// Load the driver
classOf[com.mysql.jdbc.Driver]

// Setup the connection
val conn = DriverManager.getConnection(conn_str)
try {
    // Configure to be Read Only
    val statement = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY)

    // Execute Query
    val rs = statement.executeQuery("SELECT * FROM backup")

    // Iterate Over ResultSet
    var svnFiles = Set[String]()
    while (rs.next) {
        val repos = rs.getString("repos")
        val lm = rs.getDate("lastModified")
        val lb = rs.getDate("lastBackedup")
        if (lm.getTime() > lb.getTime()) {
          println(repos + " needs backing up")
          svnFiles += repos
        }
        else {
          println(repos + " doesn't need backing up")
        }
    }
    println(svnFiles)
}
finally {
    conn.close
}

Answer 1

您需要顶层的类、对象或特征才能使其成为合法的编译源。 scala 解释器需要定义和表达式，而 scalac 需要可以转换为 Java .class 文件的内容。