一步一步搭框架(asp.netmvc+easyui+sqlserver)-03

我们期望简洁的后台代码，如下：

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Web;
  5. using System.Web.Mvc;
  6. using formula;
  7. using System.Data;
  8.  
  9. namespace demo.Areas.basic.Controllers
  10. {
  11.     public class customerController : BaseController
  12.     {
  13.         public JsonResult getList(QueryBuilder qb)
  14.         {
  15.             SqlHelper sqlHelper = new SqlHelper("demo");
  16.             var data = sqlHelper.ExecuteGridData("select *,id=customerId from customer", qb);
  17.             return Json(data);
  18.         }
  19.     }
  20. }

为了这种简洁的代码我们需要：

1、Controller基类BaseController：

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Web.Mvc;
  6. using System.Data.Entity;
  7. using System.Data.SqlClient;
  8. using System.Data.Entity.Validation;
  9. using System.ComponentModel;
  10. using System.Reflection;
  11. using System.Web.Security;
  12. using formula;
  13.  
  14. namespace formula
  15. {
  16.     public abstract class BaseController : Controller
  17.     {
  18.         #region 处理不存在的Action
  19.  
  20.         protected override void HandleUnknownAction(string actionName)
  21.         {
  22.             if (Request.HttpMethod == "POST")
  23.             {
  24.                 HttpContext.ClearError();
  25.                 HttpContext.Response.Clear();
  26.                 HttpContext.Response.StatusCode = ;
  27.                 HttpContext.Response.Write("没有Action:" + actionName);
  28.                 HttpContext.Response.End();
  29.             }
  30.  
  31.             // 搜索文件是否存在
  32.             var filePath = "";
  33.             if (RouteData.DataTokens["area"] != null)
  34.                 filePath = string.Format("~/Areas/{2}/Views/{1}/{0}.cshtml", actionName, RouteData.Values["controller"], RouteData.DataTokens["area"]);
  35.             else
  36.                 filePath = string.Format("~/Views/{1}/{0}.cshtml", actionName, RouteData.Values["controller"]);
  37.             if (System.IO.File.Exists(Server.MapPath(filePath)))
  38.             {
  39.                 View(filePath).ExecuteResult(ControllerContext);
  40.             }
  41.             else
  42.             {
  43.                 HttpContext.ClearError();
  44.                 HttpContext.Response.Clear();
  45.                 HttpContext.Response.StatusCode = ;
  46.                 HttpContext.Response.Write("没有Action:" + actionName);
  47.                 HttpContext.Response.End();
  48.             }
  49.         }
  50.         #endregion
  51.  
  52.         #region 基类Json方法重载
  53.  
  54.         protected override JsonResult Json(object data, string contentType, Encoding contentEncoding, JsonRequestBehavior behavior)
  55.         {
  56.             NewtonJsonResult result = new NewtonJsonResult() { Data = data, ContentType = contentType, ContentEncoding = contentEncoding, JsonRequestBehavior = behavior };
  57.  
  58.             return result;
  59.         }
  60.         protected override JsonResult Json(object data, string contentType, Encoding contentEncoding)
  61.         {
  62.             NewtonJsonResult result = new NewtonJsonResult() { Data = data, ContentType = contentType, ContentEncoding = contentEncoding };
  63.  
  64.             return result;
  65.         }
  66.  
  67.         #endregion
  68.  
  69.         #region 异常处理
  70.  
  71.         protected override void OnException(ExceptionContext filterContext)
  72.         {
  73.             Exception exp = filterContext.Exception;
  74.             if (string.IsNullOrEmpty(exp.Message))
  75.                 exp = exp.GetBaseException();
  76.  
  77.             if (filterContext.RequestContext.HttpContext.Request.IsAjaxRequest())
  78.             {
  79.                 var response = filterContext.RequestContext.HttpContext.Response;
  80.                 response.Clear();
  81.                 response.Write(exp.Message);
  82.                 response.StatusCode = ;
  83.                 response.End();
  84.             }
  85.         }
  86.  
  87.         #endregion
  88.     }
  89.  
  90. }

2、查询构造器QueryBuilder：

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Collections;
  6. using System.Web.Mvc;
  7.  
  8. namespace formula
  9. {
  10.     [ModelBinder(typeof(QueryBuilderBinder))]
  11.     public class QueryBuilder : SearchCondition
  12.     {
  13.         public int page { get; set; }
  14.         public int rows { get; set; }
  15.         public string sort { get; set; }
  16.         public string order { get; set; }
  17.         public int total { get; set; }
  18.  
  19.         public string getOrderByString(bool hasOrderBy = true)
  20.         {
  21.             var sortFields = this.sort.Split(',');
  22.             var sortOrders = this.order.Split(',');
  23.  
  24.             string str = "";
  25.             for (int i = ; i < sortFields.Length; i++)
  26.             {
  27.                 str += sortFields[i] + " " + sortOrders[i] + ",";
  28.             }
  29.             if (hasOrderBy && str != "")
  30.                 str = "order by " + str;
  31.             return str.Trim(',');
  32.         }
  33.  
  34.     }
  35.  
  36.     public class SearchCondition
  37.     {
  38.         public string fields = "*";
  39.         private List<ConditionItem> quickItems = new List<ConditionItem>();
  40.         private List<ConditionItem> complexItems = new List<ConditionItem>();
  41.  
  42.         public SearchCondition add(string field, string method, object val, bool isQuickSearch = false)
  43.         {
  44.             //处理日期型数据
  45.             if (method == "<" || method == "<=")
  46.             {
  47.                 if (val.GetType() == typeof(DateTime))
  48.                 {
  49.                     DateTime t = (DateTime)val;
  50.                     val = t.Date.AddHours().AddMinutes().AddSeconds();
  51.                 }
  52.             }
  53.  
  54.             ConditionItem item = new ConditionItem(field, method, val);
  55.             if (isQuickSearch)
  56.                 quickItems.Add(item);
  57.             else
  58.                 complexItems.Add(item);
  59.             return this;
  60.         }
  61.  
  62.         public string getWhereString(bool hasWhere = true)
  63.         {
  64.             if (quickItems.Count ==  && complexItems.Count == )
  65.                 return "";
  66.  
  67.             string strWhere = "";
  68.  
  69.             if (quickItems.Count > )
  70.                 strWhere += " and (" + getGourpWhereString(quickItems, true) + ")";
  71.             if (complexItems.Count > )
  72.                 strWhere += " and (" + getGourpWhereString(complexItems, false) + ")";
  73.  
  74.             if (hasWhere)
  75.                 strWhere = " where " + strWhere.Substring();
  76.             else
  77.                 strWhere = " and " + strWhere.Substring();
  78.  
  79.             return strWhere;
  80.         }
  81.  
  82.         #region 私有方法
  83.  
  84.         private string getGourpWhereString(List<ConditionItem> list, bool isOrRelation = false)
  85.         {
  86.  
  87.             if (list.Count == )
  88.                 return "";
  89.  
  90.             string strWhere = "";
  91.             for (int i = ; i < list.Count(); i++)
  92.             {
  93.                 var item = list[i];
  94.                 string str = item.getWhereString();
  95.  
  96.                 if (isOrRelation)
  97.                 {
  98.                     strWhere += " or  " + str;
  99.                 }
  100.                 else
  101.                 {
  102.                     strWhere += " and " + str;
  103.                 }
  104.             }
  105.  
  106.             strWhere = strWhere.Substring();
  107.  
  108.             return strWhere;
  109.         }
  110.  
  111.         #endregion
  112.  
  113.     }
  114.  
  115.     public class ConditionItem
  116.     {
  117.         public ConditionItem(string field, string method, object val)
  118.         {
  119.             this.field = field;
  120.             this.method = method;
  121.             this.value = val;
  122.         }
  123.         public string field { get; set; }
  124.         public string method { get; set; }
  125.         public object value { get; set; }
  126.  
  127.         public string getWhereString()
  128.         {
  129.             var item = this;
  130.             switch (item.method)
  131.             {
  132.                 case "=":
  133.                 case "<":
  134.                 case ">":
  135.                 case "<=":
  136.                 case ">=":
  137.                 case "<>":
  138.                     return string.Format("{0} {1} '{2}'", item.field, item.method, item.value);
  139.                 case "in":
  140.                     string v = "";
  141.                     if (item.value is ICollection)
  142.                     {
  143.                         ICollection<string> collection = item.value as ICollection<string>;
  144.                         v = string.Join("','", collection.ToArray<string>());
  145.                         return string.Format("{0} in('{1}')", item.field, v);
  146.                     }
  147.                     else
  148.                     {
  149.                         v = item.value.ToString().Replace(",", "','");
  150.                     }
  151.                     return string.Format("{0} in ('{1}')", item.field, v);
  152.                 case "between":
  153.                     object[] objs = item.value as object[];
  154.                     return string.Format("{0} between '{1}' and '{2}'", item.field, objs[], objs[]);
  155.                 case "inLike":
  156.                     string[] arr = null;
  157.                     if (item.value is ICollection)
  158.                     {
  159.                         ICollection<string> collection = item.value as ICollection<string>;
  160.                         arr = collection.ToArray<string>();
  161.                     }
  162.                     else
  163.                     {
  164.                         arr = item.value.ToString().Split(',', '，');
  165.                     }
  166.                     string str = "";
  167.                     foreach (string s in arr)
  168.                     {
  169.                         str += string.Format("or {0} like '%{1}%'", item.field, s);
  170.                     }
  171.                     return "(" + str.Substring() + ")";
  172.                 case "day":
  173.                     DateTime dt = DateTime.Now;
  174.                     if (!DateTime.TryParse(item.value.ToString(), out dt))
  175.                     {
  176.                         throw new BuessinessException("查询条件不能转化为日期时间");
  177.                     }
  178.                     string start = dt.Date.ToString("yyyy-MM-dd");
  179.                     string end = dt.Date.AddDays().ToString("yyyy-MM-dd");
  180.                     return string.Format("{0} between '{1}' and '{2}'", item.field, start, end);
  181.                 case "startWith":
  182.                     return string.Format("{0} like '{1}%'", item.field, item.value);
  183.                 case "endWith":
  184.                     return string.Format("{0} like '%{1}'", item.field, item.value);
  185.                 default:
  186.                     return "";
  187.             }
  188.  
  189.         }
  190.     }
  191. }

3、查询构造器QueryBuilder的创建方法QueryBuilderBinder：

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Web.Mvc;
  6.  
  7. namespace formula
  8. {
  9.     public class QueryBuilderBinder : IModelBinder
  10.     {
  11.         public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
  12.         {
  13.             var qb = (QueryBuilder)(bindingContext.Model ?? new QueryBuilder());
  14.             var dict = controllerContext.HttpContext.Request.Params;
  15.  
  16.             var quickQueryList = !string.IsNullOrEmpty(dict["quickQueryData"]) ? JsonHelper.ToList(dict["quickQueryData"]) : new List<Dictionary<string, object>>();
  17.             var queryList = !string.IsNullOrEmpty(dict["queryData"]) ? JsonHelper.ToList(dict["queryData"]) : new List<Dictionary<string, object>>();
  18.  
  19.             foreach (var dic in quickQueryList)
  20.             {
  21.                 var val = dic["value"].ToString();
  22.                 if (val == "") continue;
  23.                 qb.add(dic["field"].ToString(), dic["method"].ToString(), val, true);
  24.             }
  25.  
  26.             foreach (var dic in queryList)
  27.             {
  28.                 var val = dic["value"].ToString();
  29.                 if (val == "") continue;
  30.                 qb.add(dic["field"].ToString(), dic["method"].ToString(), val, false);
  31.             }     
  32.  
  33.             qb.page = !string.IsNullOrEmpty(dict["page"]) ? int.Parse(dict["page"].ToString()) : ;
  34.             qb.rows = !string.IsNullOrEmpty(dict["rows"]) ? int.Parse(dict["rows"].ToString()) : ;
  35.             qb.sort = !string.IsNullOrEmpty(dict["sort"]) ? dict["page"].ToString() : "id";
  36.             qb.order = !string.IsNullOrEmpty(dict["order"]) ? dict["order"].ToString() : "desc";
  37.  
  38.             return qb;
  39.  
  40.         }
  41.     }
  42. }

4、数据库查询帮助类SqlHelper：

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Data.SqlClient;
  6. using System.Data;
  7. using System.Web;
  8.  
  9. namespace formula
  10. {
  11.     public class SqlHelper
  12.     {
  13.         #region 构造函数
  14.  
  15.         public SqlHelper(string connName)
  16.         {
  17.             if (System.Configuration.ConfigurationManager.ConnectionStrings[connName] == null)
  18.                 throw new BuessinessException(string.Format("配置文件中不包含数据库连接字符串：{0}", connName));
  19.             this.connName = connName;
  20.             this.connString = System.Configuration.ConfigurationManager.ConnectionStrings[connName].ConnectionString;
  21.         }
  22.  
  23.         public string connName { get; private set; }
  24.         public string connString { get; private set; }
  25.         public string dbName
  26.         {
  27.             get
  28.             {
  29.                 SqlConnection conn = new SqlConnection(connString);
  30.                 return conn.Database;
  31.             }
  32.         }
  33.  
  34.         #endregion
  35.  
  36.         #region 基本方法
  37.  
  38.         public object ExecuteScalar(string cmdText)
  39.         {
  40.             using (SqlConnection conn = new SqlConnection(connString))
  41.             {
  42.                 conn.Open();
  43.                 SqlCommand cmd = new SqlCommand(cmdText, conn);
  44.                return cmd.ExecuteScalar();
  45.             }
  46.         }
  47.  
  48.         public DataTable ExecuteDataTable(string cmdText)
  49.         {
  50.             using (SqlConnection conn = new SqlConnection(connString))
  51.             {
  52.                 DataTable dt = new DataTable();
  53.                 SqlDataAdapter apt = new SqlDataAdapter(cmdText, conn);
  54.                 apt.Fill(dt);
  55.                 return dt;
  56.             }
  57.         }
  58.  
  59.         public DataTable ExecuteDataTable(string cmdText, int start, int len)
  60.         {
  61.             using (SqlConnection conn = new SqlConnection(connString))
  62.             {
  63.                 DataTable dt = new DataTable();
  64.                 SqlDataAdapter apt = new SqlDataAdapter(cmdText, conn);
  65.                 apt.Fill(start, len, dt);
  66.                 return dt;
  67.             }
  68.         }
  69.  
  70.         public string ExecuteNonQuery(string cmdText)
  71.         {
  72.             using (SqlConnection conn = new SqlConnection(connString))
  73.             {
  74.                 conn.Open();
  75.                 SqlCommand cmd = new SqlCommand(cmdText, conn);
  76.                 return cmd.ExecuteNonQuery().ToString();
  77.             }
  78.         }
  79.  
  80.         #endregion
  81.  
  82.         #region 支持查询对象
  83.  
  84.         public DataTable ExecuteDataTable(string sql, SearchCondition cnd, string orderBy)
  85.         {
  86.             string sqlWhere = " where 1=1" + GetUrlFilterSqlWhere(sql) + cnd.getWhereString(false);
  87.             sql = string.Format("select {0} from ({1}) sourceTable {2} {3}", cnd.fields, sql, sqlWhere, orderBy);
  88.             DataTable dt = this.ExecuteDataTable(sql);
  89.             return dt;
  90.         }
  91.  
  92.         public Dictionary<string, object> ExecuteGridData(string sql, QueryBuilder qb)
  93.         {
  94.             string sqlWhere = " where 1=1" + GetUrlFilterSqlWhere(sql) + qb.getWhereString(false);
  95.  
  96.             qb.total = (int)this.ExecuteScalar(string.Format("select count(1) from ({0}) sourceTable {1}", sql, sqlWhere));
  97.  
  98.             sql = string.Format("select {0} from ({1}) sourceTable {2} {3}", qb.fields, sql, sqlWhere, qb.getOrderByString());
  99.             DataTable dt = ExecuteDataTable(sql, (qb.page - ) * qb.rows, qb.rows);
  100.  
  101.             Dictionary<string, object> dic = new Dictionary<string, object>();
  102.             dic.Add("total", qb.total);
  103.             dic.Add("rows", dt);
  104.             return dic;
  105.         }
  106.  
  107.         #endregion
  108.  
  109.         #region 私有方法
  110.  
  111.         private string GetUrlFilterSqlWhere(string sql)
  112.         {
  113.             sql = string.Format("select * from({0}) as dt1 where 1=2", sql);
  114.             var dtField = ExecuteDataTable(sql);
  115.  
  116.             StringBuilder sb = new StringBuilder();
  117.             foreach (string key in HttpContext.Current.Request.QueryString.Keys)
  118.             {
  119.                 if (string.IsNullOrEmpty(key) || key.ToLower() == "id")
  120.                     continue;
  121.  
  122.                 if (dtField.Columns.Contains(key))
  123.                 {
  124.                     string value = HttpContext.Current.Server.UrlDecode(HttpContext.Current.Request[key]);
  125.                     value = value.Replace(",", "','");
  126.                     sb.AppendFormat(" and {0} in ('{1}')", key, value);
  127.                 }
  128.             }
  129.             return sb.ToString();
  130.         }
  131.  
  132.         #endregion
  133.  
  134.     }
  135. }

5、用于取代返回值JsonResult的NewtonJsonResult：

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Web.Mvc;
  6. using System.Web;
  7. using System.Data;
  8.  
  9. namespace formula
  10. {
  11.     public class NewtonJsonResult : JsonResult
  12.     {
  13.         public override void ExecuteResult(ControllerContext context)
  14.         {
  15.             //确认是否用于响应HTTP-Get请求
  16.             if (this.JsonRequestBehavior == JsonRequestBehavior.DenyGet &&
  17.                 string.Compare(context.HttpContext.Request.HttpMethod, "GET", true) == )
  18.             {
  19.                 throw new InvalidOperationException("禁止Get请求");
  20.             }
  21.  
  22.             HttpResponseBase response = context.HttpContext.Response;
  23.             //设置媒体类型和编码方式
  24.             response.ContentType = string.IsNullOrEmpty(this.ContentType) ?
  25.                 "application/json" : this.ContentType;
  26.             if (this.ContentEncoding != null)
  27.             {
  28.                 response.ContentEncoding = this.ContentEncoding;
  29.             }
  30.  
  31.             //序列化对象，并写入当前的HttpResponse
  32.             if (null == this.Data) return;
  33.  
  34.             if (this.Data is string)
  35.             {
  36.                 response.Write(Data);
  37.             }
  38.             else if (this.Data is DataRow)
  39.             {
  40.                 Dictionary<string, object> dic = new Dictionary<string, object>();
  41.                 DataRow row = this.Data as DataRow;
  42.                 foreach (DataColumn col in row.Table.Columns)
  43.                 {
  44.                     dic.Add(col.ColumnName, row[col]);
  45.                 }
  46.                 response.Write(JsonHelper.ToJson(dic));
  47.             }
  48.             else
  49.             {
  50.                 response.Write(JsonHelper.ToJson(this.Data));
  51.             }
  52.         }
  53.     }
  54.  
  55. }

6、Json序列化和反序列的帮助类JsonHelper：

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using Newtonsoft.Json.Converters;
  6. using Newtonsoft.Json;
  7.  
  8. namespace formula
  9. {
  10.     public static class JsonHelper
  11.     {
  12.         public static string ToJson<T>(T obj)
  13.         {
  14.  
  15.             if (obj == null || obj.ToString() == "null") return null;
  16.  
  17.             if (obj != null && (obj.GetType() == typeof(String) || obj.GetType() == typeof(string)))
  18.             {
  19.                 return obj.ToString();
  20.             }
  21.  
  22.             IsoDateTimeConverter dt = new IsoDateTimeConverter();
  23.             dt.DateTimeFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss";
  24.             return JsonConvert.SerializeObject(obj, dt);
  25.  
  26.         }
  27.  
  28.         /// <summary>
  29.         ///  从一个Json串生成对象信息
  30.         ///  </summary>
  31.         ///  <param name="jsonString">JSON字符串</param>
  32.         /// <typeparam name="T">对象类型</typeparam>
  33.         /// <returns></returns>
  34.         public static T ToObject<T>(string json) where T : class
  35.         {
  36.             if (String.IsNullOrEmpty(json)) return null;
  37.             T obj = JsonConvert.DeserializeObject<T>(json);
  38.             return obj;
  39.         }
  40.  
  41.         /// <summary>
  42.         /// 返回 Diction<string,object>
  43.         /// </summary>
  44.         /// <param name="json"></param>
  45.         /// <returns></returns>
  46.         public static Dictionary<string, object> ToObject(string json)
  47.         {
  48.             if (String.IsNullOrEmpty(json)) return new Dictionary<string, object>();
  49.             return ToObject<Dictionary<string, object>>(json);
  50.         }
  51.  
  52.         /// <summary>
  53.         /// 返回 List<Dictionary<string, object>>
  54.         /// </summary>
  55.         /// <param name="json"></param>
  56.         /// <returns></returns>
  57.         public static List<Dictionary<string, object>> ToList(string json)
  58.         {
  59.             if (String.IsNullOrEmpty(json)) return new List<Dictionary<string, object>>();
  60.             return ToObject<List<Dictionary<string, object>>>(json);
  61.         }
  62.  
  63.         /// <summary>
  64.         /// 组装对象
  65.         /// </summary>
  66.         /// <param name="json"></param>
  67.         /// <param name="obj"></param>
  68.         public static void PopulateObject(string json, object obj)
  69.         {
  70.             if (String.IsNullOrEmpty(json)) return;
  71.             JsonConvert.PopulateObject(json, obj);
  72.         }
  73.     }
  74. }

7、用于区分系统异常和业务异常的BusinessException：

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Runtime.Serialization;
  6.  
  7. namespace formula
  8. {
  9.     /// <summary>
  10.     /// 业务异常
  11.     /// </summary>
  12.     [Serializable]
  13.     public class BuessinessException : Exception
  14.     {
  15.         /// <summary>
  16.         /// 系统异常构造函数
  17.         /// </summary>
  18.         public BuessinessException()
  19.         {
  20.  
  21.         }
  22.  
  23.         /// <summary>
  24.         /// 系统异常构造函数
  25.         /// </summary>
  26.         /// <param name="message">异常的消息</param>
  27.         public BuessinessException(string message)
  28.             : base(message)
  29.         {
  30.  
  31.         }
  32.  
  33.         /// <summary>
  34.         /// 系统异常构造函数
  35.         /// </summary>
  36.         /// <param name="message">异常的消息</param>
  37.         /// <param name="inner">内部的异常</param>
  38.         public BuessinessException(string message, System.Exception inner)
  39.             : base(message, inner)
  40.         {
  41.  
  42.         }
  43.  
  44.         /// <summary>
  45.         /// 系统异常构造函数
  46.         /// </summary>
  47.         /// <param name="info">存有有关所引发异常的序列化的对象数据</param>
  48.         /// <param name="context">包含有关源或目标的上下文信息</param>
  49.         public BuessinessException(SerializationInfo info, StreamingContext context)
  50.             : base(info, context)
  51.         {
  52.  
  53.         }
  54.     }
  55. }

以上为目前的全部代码。

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