Boot-crm管理系統開發教程(二)

    ps:昨天將管理員登陸的功能完成了，並完美的解決跳過登陸從而進入管理界面的bug，今天咱們將實現"查詢用戶"功能。

    ①在po包中建立Customer類，並編寫相關變量和添加set/get方法。(相關變量：客戶編號，客戶名稱，負責人id，建立人id，客戶信息來源，客戶所屬行業，客戶級別，聯繫人，固定電話，移動電話，郵政編碼，聯繫地址，建立時間，起始行，所取行數) 而後建立BaseDict類(字典類)

    ②在dao包中建立CustomerDao接口，接口中包含 經過id查詢客戶的方法，客戶列表方法(List集合)和顯示客戶數的方法

    ③在dao包中建立CustomerDao.xml文件，在文件開頭咱們先編寫映射地址，而後編寫查詢用戶的sql語句，其id爲 "selectCustomerListWhere"  而後編寫查詢客戶列表的sql語句(查詢客戶列表的語句要和字典表結合來查)。以後編寫查詢客戶總數的sql語句。

<mapper namespace="com.yehaijing.core.dao.CustomerDao" >
    <!-- 查詢客戶 -->
   <sql id="selectCustomerListWhere">
        <where>
	       <if test="cust_name != null" >
	           cust_name like "%"#{cust_name}"%"
	       </if>
	       <if test="cust_source != null" >
	        and cust_source = #{cust_source}
	       </if>
	       <if test="cust_industry != null" >
	        and cust_industry = #{cust_industry}
	       </if>
	       <if test="cust_level != null" >
	        and cust_level = #{cust_level}
	       </if>
        </where>
    </sql>
	<!-- 查詢客戶列表  -->
	<select id="selectCustomerList" parameterType="customer" 
                                           resultType="customer">
		SELECT
			cust_id,
			cust_name,
			cust_user_id,
			cust_create_id,
			b.dict_item_name cust_source,
			c.dict_item_name cust_industry,
			d.dict_item_name cust_level,
			cust_linkman,
			cust_phone,
			cust_mobile,
			cust_createtime
		FROM
			customer a
		LEFT JOIN (
			SELECT
				dict_id,
				dict_item_name
			FROM
				base_dict
			WHERE
				dict_type_code = '002'
		) b ON a.cust_source = b.dict_id
		LEFT JOIN (
			SELECT
				dict_id,
				dict_item_name
			FROM
				base_dict
			WHERE
				dict_type_code = '001'
		) c ON a.cust_industry = c.dict_id
		LEFT JOIN (
			SELECT
				dict_id,
				dict_item_name
			FROM
				base_dict
			WHERE
				dict_type_code = '006'

@Controller
public class CustomerController {
	// 依賴注入
	@Autowired
	private CustomerService customerService;
	@Autowired
	private BaseDictService baseDictService;
	// 客戶來源
	@Value("${customer.from.type}")
	private String FROM_TYPE;
	// 客戶所屬行業
	@Value("${customer.industry.type}")
	private String INDUSTRY_TYPE;
	// 客戶級別
	@Value("${customer.level.type}")
	private String LEVEL_TYPE;
	/**
	 *  客戶列表
	 */
	@RequestMapping(value = "/customer/list.action")
	public String list(@RequestParam(defaultValue="1")Integer page,
			@RequestParam(defaultValue="10")Integer rows, 
			String custName, String custSource, String custIndustry,
			String custLevel, Model model) {
		// 條件查詢全部客戶
		Page<Customer> customers = customerService
				.findCustomerList(page, rows, custName, 
                                        custSource, custIndustry,custLevel);
		model.addAttribute("page", customers);
		// 客戶來源
		List<BaseDict> fromType = baseDictService
				.findBaseDictByTypeCode(FROM_TYPE);
		// 客戶所屬行業
		List<BaseDict> industryType = baseDictService
				.findBaseDictByTypeCode(INDUSTRY_TYPE);
		// 客戶級別
		List<BaseDict> levelType = baseDictService
				.findBaseDictByTypeCode(LEVEL_TYPE);
		// 添加參數
		model.addAttribute("fromType", fromType);
		model.addAttribute("industryType", industryType);
		model.addAttribute("levelType", levelType);
		model.addAttribute("custName", custName);
		model.addAttribute("custSource", custSource);
		model.addAttribute("custIndustry", custIndustry);
		model.addAttribute("custLevel", custLevel);
		return "customer";
}
}

) d ON a.cust_level = d.dict_id<include refid="selectCustomerListWhere"/><!-- 執行分頁查詢 --><if test="start !=null and rows != null">limit #{start},#{rows}</if></select><!-- 查詢客戶總數 --><select id="selectCustomerListCount" parameterType="customer" resultType="Integer">select count(*) from customer<include refid="selectCustomerListWhere"/></select>

       ④在service包中建立CustomerService.java接口和BaseDictService.java接口，並在CustomerService接口中編寫經過id查詢客戶的方法，傳入customer對象和查詢客戶列表的方法。在BaseDict接口中編寫根據類別代碼查詢數據字典的方法 findBaseDictByTypeCode。

      ⑤在service.impl包中建立CustomerServiceImpl.java接口實現類和BaseDictServiceImpl.java接口實現類，並在方法名上添加@Service註解和在方法內部添加@Autowired自動注入

     ⑥在Controller包中建立CustomerController.java類，在方法名上方加上@Controller註解，在方法內@Autowired自動注入CustomerService和BaseDictService。        

@Controller
public class CustomerController {
	// 依賴注入
	@Autowired
	private CustomerService customerService;
	@Autowired
	private BaseDictService baseDictService;
	// 客戶來源
	@Value("${customer.from.type}")
	private String FROM_TYPE;
	// 客戶所屬行業
	@Value("${customer.industry.type}")
	private String INDUSTRY_TYPE;
	// 客戶級別
	@Value("${customer.level.type}")
	private String LEVEL_TYPE;
	/**
	 *  客戶列表
	 */
	@RequestMapping(value = "/customer/list.action")
	public String list(@RequestParam(defaultValue="1")Integer page,
			@RequestParam(defaultValue="10")Integer rows, 
			String custName, String custSource, String custIndustry,
			String custLevel, Model model) {
		// 條件查詢全部客戶
		Page<Customer> customers = customerService
				.findCustomerList(page, rows, custName, 
                                        custSource, custIndustry,custLevel);
		model.addAttribute("page", customers);
		// 客戶來源
		List<BaseDict> fromType = baseDictService
				.findBaseDictByTypeCode(FROM_TYPE);
		// 客戶所屬行業
		List<BaseDict> industryType = baseDictService
				.findBaseDictByTypeCode(INDUSTRY_TYPE);
		// 客戶級別
		List<BaseDict> levelType = baseDictService
				.findBaseDictByTypeCode(LEVEL_TYPE);
		// 添加參數
		model.addAttribute("fromType", fromType);
		model.addAttribute("industryType", industryType);
		model.addAttribute("levelType", levelType);
		model.addAttribute("custName", custName);
		model.addAttribute("custSource", custSource);
		model.addAttribute("custIndustry", custIndustry);
		model.addAttribute("custLevel", custLevel);
		return "customer";
}
}

        總結：

            寫到這裏，咱們的查詢客戶的功能就所有寫完了，回顧一下咱們作了什麼工做：首先，咱們先建立了POJO類(用戶類和字典表類)，而後咱們在dao包中建立了用戶類和字典表類的對應接口，而且還對應的建立了xml文件。而後是service類，在service中咱們仍然仍是建立了接口，而且以後建立了該接口的實現類，最後在controller包中建立了控制類(我以爲這個類至關於一個開關 OFF/ON)。那麼將這個項目發佈到Tomocat服務器上，瀏覽器的執行順序是這樣子的：咱們在網頁上點擊操做，而後瀏覽器首先會查看教程(一)中寫好的配置文件(applicationContext.xml等~)，而後會首先進入到Controller類中，檢查RequestMapping的映射路徑(看圖)