小编Vee*_*esh的帖子

我正在构建一个桌面应用程序,它在绘图区域打印一系列矩形.此应用程序使用MONO C#构建.

我使用普通的"FOR"循环没有问题,我得到了预期的结果.

当我使用普通FOR循环时,流动是输出

当我使用普通的Parallel.For循环时,Flowing是输出

我们可以看到其间的一些矩形缺失.

我使用ConcurrentQueue来保存创建的矩形并将相同的Queue传递给其他函数以在绘图区域上打印它.

以下是代码.

 public static void DrwaWall (DrawingArea drawArea, string compLevel)
    {
        house.Rectangle rect = new house.Rectangle ();
        house.DrawHouse DrawHouse = new house.DrawHouse ();
        ConcurrentQueue<house.Rectangle> WallHouseQ = new ConcurrentQueue<house.Rectangle> ();
        PointD p1, p2, p3, p4;
        p1 = new PointD (55, 250);
        p2 = new PointD (65, 250);
        p3 = new PointD (65, 90);
        p4 = new PointD (55, 90);
        rect = new house.Rectangle (p1, p2, p3, p4);
        WallHouseQ.Enqueue (rect);
        Parallel.For (0, 27, (i) => { …

我试图从Java eclipse连接到postgreSQL

这是数据库结构的快照.

connection = DriverManager.getConnection(
                    "jdbc:postgresql://localhost:5432/postgres", "postgres",
                    "admin");

当我试图连接到postgres数据库时,它工作得很好.但这是我不想连接的默认数据库.

 connection = DriverManager.getConnection(
                        "jdbc:postgresql://localhost:5432/postgres", "han2012205",
                        "admin");

当我试图访问han2012205时,它会抛出此错误.

org.postgresql.util.PSQLException: FATAL: password authentication failed for user "han201205"
    at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:398)
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:173)
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:64)
    at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:136)
    at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:29)
    at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:21)
    at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:31)
    at org.postgresql.jdbc4.Jdbc4Connection.<init>(Jdbc4Connection.java:24)
    at org.postgresql.Driver.makeConnection(Driver.java:393)
    at org.postgresql.Driver.connect(Driver.java:267)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at connectToDB.dbConnection.connectdatabase(dbConnection.java:26)
    at AdapterTest.main(AdapterTest.java:22)

有些人可以帮我解决我的问题

希望很快能收到一些人的回复!!