ADF11g-030： 通過SQL生成動態table

一、介紹

本文介紹如何根據節目輸入的sql來生成動態table，方法有些另類，後端使用的是純Java API來做的。是因爲我在使用viewobject操作時，發現太麻煩了。這裏列出一些主要步驟和程序代碼。

二、創建ADF Application，Model層代碼如下

    public DynamicTableData getDynamicTableDataFromSQL(String sql) {
        DynamicTableData tableData = new DynamicTableData();
        List<String> columns = new ArrayList<String>();
        List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
        Statement stat =
            this.getDBTransaction().createStatement(-1);
        ResultSet rs = null;
        try {
            rs = stat.executeQuery(sql);
            ResultSetMetaData metaData = rs.getMetaData();
            int count = metaData.getColumnCount();
            for(int i=1; i<=count; i++) {
                columns.add(metaData.getColumnName(i));
            }
            while(rs.next()) {
                Map<String, Object> row = new HashMap<String, Object>();
                for(int i=0; i<columns.size(); i++) {
                    String column = columns.get(i);
                    Object value = rs.getObject(column);
                    row.put(column, value);
                }
                data.add(row);
            }
            tableData.setColumns(columns);
            tableData.setData(data);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return tableData;
    }

package model;

import java.io.Serializable;

import java.util.List;
import java.util.Map;

public class DynamicTableData implements Serializable {
    /**
     * 列集合
     */
    private List<String> columns;
    /**
     * 數據集合，一個map對象代表一行數據，key是列名稱,value是列數據庫
     */
    List<Map<String, Object>> data;
    
    public DynamicTableData() {
        super();
    }
    
    public DynamicTableData(List<String> columns, List<Map<String, Object>> data) {
        this.columns = columns;
        this.data = data;
    }

    public void setColumns(List<String> columns) {
        this.columns = columns;
    }

    public List<String> getColumns() {
        return columns;
    }

    public void setData(List<Map<String, Object>> data) {
        this.data = data;
    }

    public List<Map<String, Object>> getData() {
        return data;
    }
}

說明：將方法getDynamicTableDataFromSQL公佈到Client Interface

三、View層代碼

    1.Manage Bean，將manage bean在taskflow文件中配置好。

package view;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import model.DynamicTableData;

import oracle.adf.model.BindingContext;

import oracle.binding.BindingContainer;
import oracle.binding.OperationBinding;

public class DynamicTableBean {
    private List tableData;
    private List columns;
    private DynamicTableData dynamicTableData;
    
    public DynamicTableBean() {
        /* tableData = new ArrayList();
        Map map1 = new HashMap();
        map1.put("name", "AAAa");
        map1.put("age", "44");
        Map map2 = new HashMap();
        map2.put("name", "bbbb");
        map2.put("age", "55");
        tableData.add(map1);
        tableData.add(map2);
        columns = new ArrayList();
        columns.add("name");
        columns.add("age"); */
    }
    
    public String executeQuery() {
        BindingContainer bindings = getBindings();
        OperationBinding operationBinding = bindings.getOperationBinding("getDynamicTableDataFromSQL");
        DynamicTableData result = (DynamicTableData)operationBinding.execute();
        this.dynamicTableData = result;
        return null;
    }
    
    public void setTableData(List tableData) {
        this.tableData = tableData;
    }

    public List getTableData() {
        if(dynamicTableData != null) {
            tableData = dynamicTableData.getData();
        }
        return tableData;
    }

    public void setColumns(List columns) {
        this.columns = columns;
    }

    public List getColumns() {
        if(dynamicTableData != null) {
            columns = dynamicTableData.getColumns();
        }
        return columns;
    }

    public void setDynamicTableData(DynamicTableData dynamicTableData) {
        this.dynamicTableData = dynamicTableData;
    }

    public DynamicTableData getDynamicTableData() {
        return dynamicTableData;
    }

    public BindingContainer getBindings() {
        return BindingContext.getCurrent().getCurrentBindingsEntry();
    }
}

     2.頁面代碼

<?xml version='1.0' encoding='UTF-8'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
          xmlns:f="http://java.sun.com/jsf/core"
          xmlns:h="http://java.sun.com/jsf/html"
          xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
  <jsp:directive.page contentType="text/html;charset=UTF-8"/>
  <f:view>
    <af:document id="d1">
      <af:messages id="m1"/>
      <af:form id="f1">
        <af:panelGroupLayout id="pgl1" layout="vertical">
          <af:panelGroupLayout id="pgl2" layout="vertical">
            <af:panelFormLayout id="pfl1">
              <af:inputText value="#{bindings.sql.inputValue}"
                            label="#{bindings.sql.hints.label}"
                            required="#{bindings.sql.hints.mandatory}"
                            columns="50"
                            maximumLength="#{bindings.sql.hints.precision}"
                            shortDesc="#{bindings.sql.hints.tooltip}" id="it1"
                            rows="4">
                <f:validator binding="#{bindings.sql.validator}"/>
              </af:inputText>
              <af:commandButton
                                text="Execute Query"
                                disabled="#{!bindings.getDynamicTableDataFromSQL.enabled}"
                                id="cb1"
                                action="#{viewScope.dynamicTableBean.executeQuery}"/>
            </af:panelFormLayout>
          </af:panelGroupLayout>
          <af:panelGroupLayout id="pgl3" layout="vertical">
            <af:table value="#{viewScope.dynamicTableBean.tableData}" var="row"
                      rowBandingInterval="0" id="t1" width="100%">
              <af:forEach var="def" items="#{viewScope.dynamicTableBean.columns}">
                <af:column headerText="#{def}" sortable="true" id="column1">
                  <af:outputText value="#{row[def]}" id="ot1"/>
                </af:column>
              </af:forEach>
            </af:table>
          </af:panelGroupLayout>
        </af:panelGroupLayout>
      </af:form>
    </af:document>
  </f:view>
</jsp:root>