如何动态获取数据库表中的数据，数据库中的字段是在变化的

　　比如：我们在做CRM系统的时候，CRM系统中的字段是根据用户自己的需求来自己设定的，我们首先提供一些，必须的几个常用的字段，特别的用户是根据自己公司的建制有自己需求的字段，那我们就要在设计数据库的时候提前预留出一些字段大概也就是20个左右的字段，让客户使用。那我们针对这个预留的字段怎么获取值啊？比如用户在界面上把预留字段strFiled1设置成“公司的文化”这个字段，那我们该如何处理界面上显示的这个字段所对应的值那？这个预留的字段的名（strField1）会不会被修改成（companyWenHua）这个名字啊？估计大家都会有这样的疑问，我刚开始也是怀揣这个疑问。下面直接上代码：

　　

//得到Customer的值
	public static Map<String, String> getCustomerValue(PortletRequest portletRequest, Long customerId)
			throws PortalException, SystemException {
		Map<String, String> dynamicValue = null;
		long companyId = PortalUtil.getCompanyId(portletRequest);
		if (customerId > 0) {
			
			Customer customer = null;
			try {
				customer = CustomerLocalServiceUtil.getCustomer(customerId);
			} catch (NoSuchCustomerException e) {
				_log.error("Exception : No Such Customer Exception " + customerId);
				customer = null;
			}
			
			if (customer != null) {
				
				List<CompanyColumnDefinition> companyColumns = CompanyColumnDefinitionLocalServiceUtil.searchByTableName(companyId, TableConst.CRM_Customer, true);
				dynamicValue = new HashMap<String, String>();
				for(CompanyColumnDefinition companyColumn : companyColumns){
					String columnName = companyColumn.getColumnName();
					if (columnName.equals("code")) {
						dynamicValue.put(columnName, customer.getCode());
					} else if (columnName.equals("customerName")) {
						dynamicValue.put(columnName, customer.getCustomerName() );
					} else if (columnName.equals("customerType")) {
						String type = customer.getCustomerType();
						dynamicValue.put(columnName, type == null?StringPool.BLANK:type);
					} else if (columnName.equals("source")){
						String source = customer.getSource();
						dynamicValue.put(columnName, source == null?StringPool.BLANK:source);
					} else if (columnName.equals("upCustomerId")) {
						String upName = StringPool.BLANK;
						long upId = customer.getUpCustomerId();
						if (upId != 0L) {
							String prefix = "<a href='"
									+ PortletURLUtil.getObjDetailURL(
											portletRequest,
											PortletIDs.CUSTOMER_DETAIL, upId)
									+ "'>";
							String suffix = "</a>";
							
							upName = prefix
									+ CustomerLocalServiceUtil
											.getCustomer(upId).getCustomerName()
									+ suffix;
						}
						dynamicValue.put(columnName, upName );
					} else if (columnName.equals("contactId")) {
						long contactId = customer.getContactId();
						String contactName = StringPool.BLANK;
						if (contactId > 0) {
							String prefix = "<a href='"
								+ PortletURLUtil.getObjDetailURL(
										portletRequest,
										PortletIDs.CONTACT_DETAIL, contactId)
								+ "'>";
						String suffix = "</a>";
						
						contactName = prefix+ ContactLocalServiceUtil.getContact(contactId).getContactName()
								+ suffix;
						}
						dynamicValue.put(columnName, contactName);
					} else if (columnName.equals("region")) {
						String region = customer.getRegion();
						dynamicValue.put(columnName, region == null?StringPool.BLANK:region);
					} else if (columnName.equals("phone")) {
						dynamicValue.put(columnName, customer.getPhone());
					} else if (columnName.equals("email")) {
						dynamicValue.put(columnName, customer.getEmail());
					} else if (columnName.equals("mobile")) {
						dynamicValue.put(columnName, customer.getMobile());
					} else if (columnName.equals("country")) {
						String country = customer.getCountry();
						dynamicValue.put(columnName, country);
					} else if (columnName.equals("province")) {
						String province = customer.getProvince();
						dynamicValue.put(columnName, province);
					} else if (columnName.equals("city")) {
						String city = customer.getCity();
						dynamicValue.put(columnName, city);
					} else if (columnName.equals("area")) {
						String area = customer.getArea();
						dynamicValue.put(columnName, area);
					} else if (columnName.equals("postCode")) {
						String postCode = customer.getPostCode();
						dynamicValue.put(columnName, postCode == null ? StringPool.BLANK : postCode);
					} else if (columnName.equals("address")) {
						Locale locale = CompanyLocalServiceUtil.getCompany(companyId).getLocale();
						String address = customer.getAddress();
						
						if (!address.equals("")) {
							address += "  <a class='baiduMap' style='color:#015BA7;' href='javascript:void(0);'>"
									+ LanguageUtil.get(
											PortletIDs.INITIALIZATION, locale,
											"baidu.map") + "</a>";
						} else {
							address += "<a class='baiduMap' style='color:#015BA7;' href='javascript:void(0);'>"
								+ LanguageUtil.get(
										PortletIDs.INITIALIZATION, locale,
										"baidu.map.marker") + "</a>";
						}
						dynamicValue.put(columnName, address);
					} else if (columnName.equals("ownerId")) {
						long ownerId = customer.getOwnerId();
						String ownerName = StringPool.BLANK;
						if (ownerId != 0L) {
							ownerName = UserLocalServiceUtil.getUser(ownerId).getFirstName();
						}
						dynamicValue.put(columnName, ownerName);
					} else if (columnName.equals("createUserId")) {
						long createUserId = customer.getCreateUserId();
						StringBuffer createUser = new StringBuffer(StringPool.BLANK);
						if (createUserId != 0L) {
							createUser.append(UserLocalServiceUtil.getUser(createUserId).getFirstName())
									.append(StringPool.COMMA)
									.append(DateUtil.formatDateTime(customer.getCreateDate()));
						}
						dynamicValue.put(columnName, createUser.toString());
					} else if (columnName.equals("createDate")) {
						dynamicValue.put(columnName, DateUtil.formatDateTime(customer.getCreateDate()));
					} else if (columnName.equals("editUserId")) {
						long editUserId = customer.getEditUserId();
						StringBuffer editUser = new StringBuffer(StringPool.BLANK);
						if (editUserId != 0L) {
							editUser.append(UserLocalServiceUtil.getUser(editUserId).getFirstName())
									.append(StringPool.COMMA)
									.append(DateUtil.formatDateTime(customer.getEditDate()));
						}
						dynamicValue.put(columnName, editUser.toString());
					} else if (columnName.equals("editDate")) {
						dynamicValue.put(columnName, DateUtil.formatDateTime(customer.getEditDate()));
					} else if (columnName.equals("ownerChangeDate")) {
						dynamicValue.put(columnName, DateUtil.formatDateTime(customer.getOwnerChangeDate()));
					} else if (columnName.equals("webSite")) {
						String webSite = customer.getWebSite() != null ? customer.getWebSite() : StringPool.BLANK;
						StringBuffer sb = new StringBuffer(StringPool.BLANK);
						sb.append("<a href=").append(StringPool.QUOTE).append("http://").append(webSite)
							.append(StringPool.QUOTE).append(StringPool.SPACE).append("target=")
							.append(StringPool.QUOTE).append("_blank").append(StringPool.QUOTE)
							.append(">").append(webSite).append("</a>");
						dynamicValue.put(columnName, sb.toString());
					} else if (columnName.equals("relationShip")) {
						String relationShip = customer.getRelationShip();
						dynamicValue.put(columnName, relationShip == null ? StringPool.BLANK : relationShip);
					} else if (columnName.equals("industry")) {
						String industry = customer.getIndustry();
						dynamicValue.put(columnName, industry == null ? StringPool.BLANK : industry); 
					} else if (columnName.equals("staffNum")) {
						String staffNum = customer.getStaffNum();
						dynamicValue.put(columnName, staffNum);
					} else if (columnName.equals("yearRevenue")) {
						double yearRevenue = customer.getYearRevenue();
						dynamicValue.put(columnName, TextUtil.doubleToText(yearRevenue, 2));
					} else if (columnName.equals("strField1")) {
						dynamicValue.put(columnName, customer.getStrField1());
					} else if (columnName.equals("strField2")) {
						dynamicValue.put(columnName, customer.getStrField2());
					} else if (columnName.equals("strField3")) {
						dynamicValue.put(columnName, customer.getStrField3());
					} else if (columnName.equals("strField4")) {
						dynamicValue.put(columnName, customer.getStrField4());
					} else if (columnName.equals("strField5")) {
						dynamicValue.put(columnName, customer.getStrField5());
					} else if (columnName.equals("strField6")) {
						dynamicValue.put(columnName, customer.getStrField6());
					} else if (columnName.equals("strField7")) {
						dynamicValue.put(columnName, customer.getStrField7());
					} else if (columnName.equals("strField8")) {
						dynamicValue.put(columnName, customer.getStrField8());
					} else if (columnName.equals("strField9")) {
						dynamicValue.put(columnName, customer.getStrField9());
					} else if (columnName.equals("strField10")) {
						dynamicValue.put(columnName, customer.getStrField10());
					} else if (columnName.equals("textareaField1")) {
						String textareaField1 = customer.getTextareaField1();
						if (textareaField1 == null) {
							textareaField1 = StringPool.BLANK;
						}
						
						dynamicValue.put(columnName, textareaField1);
					} else if (columnName.equals("textareaField2")) {
						String textareaField2 = customer.getTextareaField2();
						if (textareaField2 == null) {
							textareaField2 = StringPool.BLANK;
						}
						
						dynamicValue.put(columnName, textareaField2);
					} else if (columnName.equals("textareaField3")) {
						String textareaField3 = customer.getTextareaField3();
						if (textareaField3 == null) {
							textareaField3 = StringPool.BLANK;
						}
						
						dynamicValue.put(columnName, textareaField3);
					} else if (columnName.equals("textareaField4")) {
						String textareaField4 = customer.getTextareaField4();
						if (textareaField4 == null) {
							textareaField4 = StringPool.BLANK;
						}
						
						dynamicValue.put(columnName, textareaField4);
					} else if (columnName.equals("floatField1")) {
						double floatField1 = customer.getFloatField1();
						dynamicValue.put(columnName, TextUtil.doubleToText(floatField1, 2));
					} else if (columnName.equals("floatField2")){
						double floatField2 = customer.getFloatField2();
						dynamicValue.put(columnName, TextUtil.doubleToText(floatField2, 2));
					} else if (columnName.equals("floatField3")){
						double floatField3 = customer.getFloatField3();
						dynamicValue.put(columnName, TextUtil.doubleToText(floatField3, 2));
					} else if (columnName.equals("floatField4")){
						double floatField4 = customer.getFloatField4();
						dynamicValue.put(columnName, TextUtil.doubleToText(floatField4, 2));
					} else if (columnName.equals("dateField1")){
						dynamicValue.put(columnName, DateUtil.formatDateNoHour(customer.getDateField1()));
					} else if (columnName.equals("dateField2")){
						dynamicValue.put(columnName, DateUtil.formatDateNoHour(customer.getDateField2()));
					} else if (columnName.equals("dateField3")){
						dynamicValue.put(columnName, DateUtil.formatDateNoHour(customer.getDateField3()));
					} else if (columnName.equals("dateField4")){
						dynamicValue.put(columnName, DateUtil.formatDateNoHour(customer.getDateField4()));
					} else if (columnName.equals("attaField1")) {
						dynamicValue.put(columnName, getAttathment(portletRequest, customer.getAttaField1()));
					} else if (columnName.equals("attaField2")) {
						dynamicValue.put(columnName, getAttathment(portletRequest, customer.getAttaField2()));
					} else if (columnName.equals("integerField1")) {
						dynamicValue.put(columnName, String.valueOf(customer.getIntegerField1()));
					} else if (columnName.equals("integerField2")) {
						dynamicValue.put(columnName, String.valueOf(customer.getIntegerField2()));
					} else if (columnName.equals("integerField3")) {
						dynamicValue.put(columnName, String.valueOf(customer.getIntegerField3()));
					} else if (columnName.equals("integerField4")) {
						dynamicValue.put(columnName, String.valueOf(customer.getIntegerField4()));
					}
				}
			}
		}
		return dynamicValue;
	}

　　在上述的源代码中：

List<CompanyColumnDefinition> companyColumns = CompanyColumnDefinitionLocalServiceUtil.searchByTableName(companyId, TableConst.CRM_Customer, true);
这一句话是不是看起来很简单，只看名字估计大家都能知道什么意思，不就是通过数据库的名字找到数据库中的所有的列吗？大家用脚指头想想，也是这个意思，第一个参数代表是公司的id。第二个参数表的名字。是你真聪明，但是后台他做的事情很多的。这个等我看过源代码再给大家补充上去，我只是猜测，不敢断言。通过注解可以实现通过数据库的表的名字能找到列的名字。

if (columnName.equals("dateField1")){
		dynamicValue.put(columnName, DateUtil.formatDateNoHour(customer.getDateField1()));
｝这一行代码的意思是不是解释了大家的疑问。它是没有改变列的名字，只是修改了列的对应的内容。