Question

This is the constructor code:

    public TreeExample() throws SQLException {
        TreeItem node1 = null;

        String url = "jdbc:oracle:thin:@xyz";
        String user = "dummy";
        String password = "dummy";

        root = new ArrayList<TreeItem>();

        Connection connection = DriverManager.getConnection(url, user, password);
        Statement statement = connection.createStatement();
        String sql = "SELECT * FROM HEALTH_CHECK_QUERIES ORDER BY HEADER_TYPE ASC";

        ResultSet result = statement.executeQuery(sql);
        String previousheadernode = "First";
        while (result.next()) {

            String headernode = result.getString("Header_Type");
            String childnode = result.getString("Detail_Type");

            if (!headernode.equals(previousheadernode))

            {
                node1 = new TreeItem(headernode, headernode);
                root.add(node1);
                previousheadernode = headernode;


            }

            ArrayList<TreeItem> node1Children = new ArrayList<TreeItem>();
            TreeItem node1Child1 = new TreeItem(childnode, childnode);
            node1Children.add(node1Child1);
            node1.setChildren(node1Children);

        }


        setListInstance(root);
    }

这就是我创建树的方法。但子节点没有根据需要添加到父节点（必须将D1和D2添加到父节点H1）。

请建议我改变。有没有其他简单的方法来实现相同的目标？

我的表格如下：

    header_details    detail_type   query
    --------------------------------------------------
    H1            D1            SELECT * FROM xyz;
    H1            D2            SELECT * FROM xyz;
    H2            D21           SELECT * FROM xyz;
    H2            D22           SELECT * FROM xyz;
    H3            D3            SELECT * FROM xyz;
    H3            D32           SELECT * FROM xyz;

    This is how I am creating tree.But the child nodes are not getting added to     the parent as required(D1 and D2 must be added to parent node H1).

请建议我改变。有没有其他简单的方法来实现相同的目标？

先谢谢。

Answer 1

你在这里做错了，因为它不是ADF的做事方式了解如何使用模型和应用程序模块。

在adf中有很多样本如何使用树模型：

如何使用单个数据库表在adf中创建树结构？

1 个答案: