Java JDBC同时连接MySQL和Sybase数据库

我试图从SYBASE数据库中检索数据，并将检索到的数据复制到MySQL中的一个表中。我能够分别连接这两个数据库（即使用SYBASE的jTDS驱动程序和MySQL的Jdbc_驱动程序）

现在我想在一个程序中同时连接两个数据库。但是我不知道应该在

Class.forName（）中编写什么

我使用了
Class.forName（JDBC_驱动程序）用于MySQL和
Class.forName（“net.sourceforge.jtds.jdbc.Driver”）用于SYBASE

Sybase:

public static void main(String[] args) {

    String a;
    String b;
    String c;

    try {  
        Class.forName("net.sourceforge.jtds.jdbc.Driver");  
        Connection con = DriverManager.getConnection(  
                "jdbc:jtds:sybase://10.159.252.29:4100/fmdb","sa","Changeme_123");  

        Statement stmt = con.createStatement();  
        ResultSet rs = stmt.executeQuery("selecttbl_alm_log_2000000000.Csn,"
                + "tbl_alm_log_2000000000.IsCleared,"
                + "tbl_alm_log_2000000000.Id"
                + "From fmdb.dbo.tbl_alm_log_2000000000"
                + "Where IsCleared = 0"); 

        while(rs.next()) {
            a = rs.getString(1);
            b = rs.getString(2);
            c = rs.getString(3);

            System.out.println(a+"  "+b+"  "+c);
        }

        con.close();  
    } catch(Exception e) {
        System.out.println(e);
    }  
}

try {
    Class.forName(JDBC_DRIVER);
    System.out.println("connecting to database");

    conn = DriverManager.getConnection(DB_URL, USER, PASS);
    System.out.println("connected to database successfully");

    System.out.println("creating table in given database");

    // stmt = conn.createStatement();
    String sql = "CREATE TABLE newtable "
            + "(id INTEGER not NULL, "
            + "first VARCHAR(255), "
            + "PRIMARY KEY ( id ))";

    stmt = conn.prepareStatement(sql);
    stmt.executeUpdate(sql);

    System.out.println("created table in database");
}

MySQL:

public static void main(String[] args) {

    String a;
    String b;
    String c;

    try {  
        Class.forName("net.sourceforge.jtds.jdbc.Driver");  
        Connection con = DriverManager.getConnection(  
                "jdbc:jtds:sybase://10.159.252.29:4100/fmdb","sa","Changeme_123");  

        Statement stmt = con.createStatement();  
        ResultSet rs = stmt.executeQuery("selecttbl_alm_log_2000000000.Csn,"
                + "tbl_alm_log_2000000000.IsCleared,"
                + "tbl_alm_log_2000000000.Id"
                + "From fmdb.dbo.tbl_alm_log_2000000000"
                + "Where IsCleared = 0"); 

        while(rs.next()) {
            a = rs.getString(1);
            b = rs.getString(2);
            c = rs.getString(3);

            System.out.println(a+"  "+b+"  "+c);
        }

        con.close();  
    } catch(Exception e) {
        System.out.println(e);
    }  
}

try {
    Class.forName(JDBC_DRIVER);
    System.out.println("connecting to database");

    conn = DriverManager.getConnection(DB_URL, USER, PASS);
    System.out.println("connected to database successfully");

    System.out.println("creating table in given database");

    // stmt = conn.createStatement();
    String sql = "CREATE TABLE newtable "
            + "(id INTEGER not NULL, "
            + "first VARCHAR(255), "
            + "PRIMARY KEY ( id ))";

    stmt = conn.prepareStatement(sql);
    stmt.executeUpdate(sql);

    System.out.println("created table in database");
}

这些只是片段。我只是想合并上面的代码。
请告诉我这是否可行，并分享一些见解。
建议将复杂任务划分为更小和更简单的任务：

1） 创建一个readDB（int startReading，int endReading）方法，返回结果集

2） 创建方法writeDB（ResultSet result）

3） 创建一个createTableDB（）方法

p.S.readDB与第一个示例非常接近，必须返回对db的读取，writeDB只需在db内写入，然后createTableDB必须在db上创建表，就像您在第二个示例中编写的一样

伪最终代码，在main中：

    createTableDB();
    // it's good to make a loop for next part:
    ResultSet read1=readDB(0,200);
    writeDB(read1);
    ResultSet read2=readDB(200,400);
    writeDB(read2);
    ResultSet read3=readDB(400,....); //to the end of db
    writeDB(read3);

这是一个非常简单的解决方案，它并不完美，可以根据您的需要进行修改。
可以像这样在一个程序中创建多个连接

public static void main(String[] args) {

  try{  
      Class.forName("net.sourceforge.jtds.jdbc.Driver");  
      Connection con1 = DriverManager.getConnection("jdbc:jtds:sybase://10.159.252.29:4100/fmdb","sa","Changeme_123");

      Class.forName(JDBC_DRIVER);
      Connection con2 = DriverManager.getConnection(DB_URL, USER, PASS);

      ///After getting both connections, write your code

      String a;
      String b;
      String c;

      Statement stmt= con1.createStatement();  
      ResultSet rs=stmt.executeQuery("select tbl_alm_log_2000000000.Csn, tbl_alm_log_2000000000.IsCleared, tbl_alm_log_2000000000.Id From fmdb.dbo.tbl_alm_log_2000000000 Where IsCleared = 0");  
      while(rs.next()) ///If your query result is single row, use if instead of while 
          {
          a = rs.getString(1);
          b = rs.getString(2);
          c = rs.getString(3);

          System.out.println(a+"  "+b+"  "+c);
          }

      String sql = "CREATE TABLE newtable " + "(id INTEGER not NULL, " + "first VARCHAR(255), " + "PRIMARY KEY ( id ))";
      stmt = con2.prepareStatement(sql);
      stmt.executeUpdate(sql);

      con1.close();
      con2.close();
      }catch(Exception e){ System.out.println(e);}  
   }    

} 

forName（…）
只是用来强制加载JDBC驱动程序类，所以只需使用它两次。或者干脆把它放在一起，因为从Java6开始，它对于大多数JDBC驱动程序来说都是过时的。我尝试了没有Class.forName（）的mysql程序，它给出了一个没有找到合适驱动程序的错误。这是否意味着我安装了较旧版本的java？@prateekk或您使用的是非常旧版本的驱动程序。我将尝试与您联系。泰