我无法在 Ubuntu 16.04 上安装 MySQL JDBC 驱动程序

Question

我下载了 MySQL JDBC 驱动程序以将 Scala 连接到 MySQL 数据库，但我无法使用 java -jar mysql-connector-java-5.1.45-bin.jar 安装它。它说，没有主清单属性，在 mysql-connector-java-5.1.45-bin.jar

我找不到任何 MANIFEST.MF 文件。

任何帮助将不胜感激。

编辑：运行sbt run后的警告

[info] Loading project definition from /home/alessandro/Scala/tests/project
[info] Loading settings from build.sbt ...
[info] Set current project to MyProject (in build file:/home/alessandro/Scala/tests/)
[info] Running tests.ScalaJdbcConnectSelect 
Sun Feb 18 21:51:33 CET 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'pmanager.user' doesn't exist
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
    at com.mysql.jdbc.Util.getInstance(Util.java:408)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:944)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2480)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2438)
    at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1381)
    at tests.ScalaJdbcConnectSelect$.delayedEndpoint$tests$ScalaJdbcConnectSelect$1(ScalaJdbcConnectSelect.scala:16)
    at tests.ScalaJdbcConnectSelect$delayedInit$body.apply(ScalaJdbcConnectSelect.scala:5)
    at scala.Function0.apply$mcV$sp(Function0.scala:34)
    at scala.Function0.apply$mcV$sp$(Function0.scala:34)
    at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
    at scala.App.$anonfun$main$1$adapted(App.scala:76)
    at scala.collection.immutable.List.foreach(List.scala:389)
    at scala.App.main(App.scala:76)
    at scala.App.main$(App.scala:74)
    at tests.ScalaJdbcConnectSelect$.main(ScalaJdbcConnectSelect.scala:5)
    at tests.ScalaJdbcConnectSelect.main(ScalaJdbcConnectSelect.scala)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at sbt.Run.invokeMain(Run.scala:93)
    at sbt.Run.run0(Run.scala:87)
    at sbt.Run.execute$1(Run.scala:65)
    at sbt.Run.$anonfun$run$4(Run.scala:77)
    at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
    at sbt.util.InterfaceUtil$$anon$1.get(InterfaceUtil.scala:10)
    at sbt.TrapExit$App.run(TrapExit.scala:252)
    at java.base/java.lang.Thread.run(Thread.java:844)
[success] Total time: 3 s, completed Feb 18, 2018, 9:51:34 PM

Answer 1

更新：

我找到了两个选择：

第一个

在您的build.sbt 替换行中

libraryDependencies += "mysql" % "mysql-connector-java" % "5.1.24"

用这个：

libraryDependencies ++= Seq(
"mysql" % "mysql-connector-java" % "5.1.16"
)

在命令行中：

sbt compile
sbt run

第二个

在命令行中使用：

set fullClasspath in Compile += Attributed.blank(file("path-to-your-connector-jar"))
sbt compile
sbt run

之后，驱动的问题应该会消失，但是检查数据以连接数据库。

更新前：

在你的 Scala 项目中，你也可以使用这个：

package tests

import java.sql.{Connection,DriverManager}

object ScalaJdbcConnectSelect extends App {

  // connect to the database named "mysql" on port 8889 of localhost
  val url = "jdbc:mysql://localhost:8889/mysql"
  val driver = "com.mysql.jdbc.Driver"
  val username = "root"
  val password = "root"
  var connection:Connection = _
  try {
    Class.forName(driver)
    connection = DriverManager.getConnection(url, username, password)
    val statement = connection.createStatement
    val rs = statement.executeQuery("SELECT host, user FROM user")
    while (rs.next) {
      val host = rs.getString("host")
      val user = rs.getString("user")
      println("host = %s, user = %s".format(host,user))
    }
  } catch {
    case e: Exception => e.printStackTrace
  }
  connection.close
}

Link to source 1

Link to source 2

Answer 2

请阅读这一行：

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'pmanager.user' doesn't exist

检查是否有这样的表。如果是这样，请在点后留下字符 (user)。