c# - 异常 : No suitable driver found for jdbc:derby:\\serveraddress\db;create=false

Question

我知道这个问题已经被问过很多次了……但它总是指的是 JAVA。这次不行

1. 代码是使用 derbyNET.dll 在 C# 中构建的(并从 .jar 编译为.dll derby.dll 和 derbytools.dll)
2. 用 Java 编写的相同代码(也使用 javac 在 JAVA 中编译&& java...) 仅当我在程序运行之前添加时才能正常工作:设置CLASSPATH=C:\PROGRA~1\Java\JDK18~1.0_7\DB-DER~1.0-B\lib\derby.jar;C:\PROGRA~1\Java\JDK18~1.0_7\DB-DER~1.0- B\lib\derbytools.jar;
3. 用 C# 编写的代码抛出上述错误。我也试过改造此代码从 java 到 c#，错误是相同的。
4. 我很确定这个问题是因为 C# 看不到作为驱动程序的库(derby.dll 和 derbytools.dll)

关于如何将此驱动程序添加到 visual studio 的任何建议？

C# 代码:

try{
    DerbyNET derbyDB = new DerbyNET(@"\\serveraddress\sql\db;        create=false");
    if (!derbyDB.openConnection()){
         //Error opening Derby DB
         Console.WriteLine("not connected");
         return;
    }

    DataTable oDT = derbyDB.getRS("SELECT * FROM admin.user_data") as DataTable;
    if (oDT.Columns[0].ColumnName == "Erro"){
        //Read the ** ERRORS ** section below
        Thread.Sleep(1000);
        oDT = derbyDB.getRS("SELECT * FROM FROM admin.user_data") as DataTable;
    }
    else if (oDT.Rows.Count == 1 && oDT.Columns.Count == 1){
         //Some error occured
         String strError = derbyDB.getLastError();
         return;
     }

    foreach (DataRow row in oDT.Rows){
       Console.WriteLine("---ROW---");
       foreach (var item in row.ItemArray){
           Console.Write("Item: ");
           Console.WriteLine(item);
       }
    }
  derbyDB.closeConnection();
}
catch (Exception ex){
    Console.WriteLine(ex.Message);
}

Java 代码:

try{  
     {    
        con = DriverManager.getConnection("jdbc:derby:\\\\serveraddress\\sql\\db;create=false");
       Statement sta = con.createStatement();
       ResultSet res = sta.executeQuery("SELECT * FROM ADMIN.USER_DATA");
       java.lang.System.@out.println("ADMIN.USER_DATA: ");
      while (res.next()){
         java.lang.System.@out.println("  " + res.getString("USERID") + ", " + res.getString("PASSWORD") + ", " + res.getString("FIRST_NAME") + ", " + res.getString("LAST_NAME") +
                            ", " + res.getString("EMAIL"));
     }
      res.close();
      sta.close();
      con.close();
     }
 }
 catch (System.Exception e){
      {
        java.lang.System.err.println("Exception: " + e.getMessage());
      }
  }

Answer 1

我已经解决了这个问题。1) 必须通过 ikvmc 将两个库 derbytools.jar 和 derby.jar 编译为 .dll 并添加为引用2)需要添加NuGet包“IKVM.OpenJDK.Jdbc和IKVM.OpenJDK.Core3) 当前代码是 (C#):

using System;
using System.Diagnostics;
using java.sql;
DriverManager.registerDriver(new org.apache.derby.jdbc.EmbeddedDriver());
Connection derbyConn = DriverManager.getConnection("jdbc:derby:\\\\serveraddress\\directory\\sql\\db;create=false");
Statement sta = derbyConn.createStatement();
ResultSet res = sta.executeQuery("SELECT * FROM tablename");
java.lang.System.@out.println("tablename: ");
            while (res.next())
            {

                java.lang.System.@out.println("  " + res.getString("1stColumn") + ", " + res.getString("2ndColumn"));
            }
            res.close()
            sta.close();
            derbyConn.close();