一个类文件搞定SQL条件映射解析,实现轻量简单实用ORM功能

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个人觉得轻简级的ORM既要支持强类型编码,又要有执行效率,还要通俗易懂给开发者友好提示,结合Expression可轻松定制自己所需要功能。

 

表达式解析代码:

  1 using System;
  2 using System.Collections;
  3 using System.Collections.Generic;
  4 using System.Data.Common;
  5 using System.Linq;
  6 using System.Linq.Expressions;
  7 using System.Text;
  8 using System.Reflection;
  9 using System.Text.RegularExpressions;
 10 
 11 using Util.Database;
 12 namespace Util.EntityMapping
 13 {
 14 
 15 
 16     public class SqlLmdResolver
 17     {
 18 
 19         internal int ParaIndex = 1;
 20 
 21 
 22         public string _SqlWhere = null;
 23         public string SqlWhere
 24         {
 25             get { return _SqlWhere; }
 26         }
 27 
 28 
 29         private List<DbParameter> _Parameters = null;
 30         public List<DbParameter> Parameters
 31         {
 32             get { return _Parameters; }
 33         }
 34 
 35 
 36         private DbConfig _DbConfig = null;
 37 
 38 
 39         public SqlLmdResolver(DbConfig config = null)
 40         {
 41             _DbConfig = config ?? DbConfig.Default;
 42             _SqlWhere = string.Empty;
 43             _Parameters = new List<DbParameter>();
 44         }
 45 
 46 
 47 
 48         public void ResolveExpression(Expression expression = null, SqlWhereType whereType = SqlWhereType.And)
 49         {
 50             if (expression == null)
 51             {
 52                 _SqlWhere = string.Empty;
 53                 return;
 54             }
 55             var sqlFormat = (whereType == SqlWhereType.And) ? " AND {0} " : " OR {0} ";
 56             SqlLmdResolver.MemberType type = SqlLmdResolver.MemberType.None;
 57             this._SqlWhere = string.Format(sqlFormat, GetResolveAll(expression, ref type).SqlConditions);
 58         }
 59 
 60         
 61         private enum MemberType
 62         {
 63             None = 0,
 64             Left = 1,
 65             Right = 2
 66         }
 67 
 68         private struct ParamInfo
 69         {
 70             public string SqlConditions;
 71             public object ObjectValue;
 72         }
 73 
 74 
 75 
 76         private string AddParametersReturnLeft(ref ParamInfo left, ParamInfo right)
 77         {
 78             string oldLeftKey = left.SqlConditions;
 79             left.SqlConditions = "P"+ ParaIndex + oldLeftKey;
 80             ParaIndex++;
 81             if (right.ObjectValue == null)
 82             {
 83                 this._Parameters.Add(DbProvider.MakeParam(_DbConfig, "@" + left.SqlConditions, DBNull.Value));
 84             }
 85             else
 86             {
 87                 this._Parameters.Add(DbProvider.MakeParam(_DbConfig, "@" + left.SqlConditions, right.ObjectValue));
 88             }
 89             return oldLeftKey;
 90         }
 91         private string AddParametersReturnRight(ParamInfo left, ref ParamInfo right)
 92         {
 93             string oldRightKey = right.SqlConditions;
 94             right.SqlConditions = "P" + ParaIndex + oldRightKey;
 95             ParaIndex++;
 96             if (left.ObjectValue == null)
 97             {
 98                 this._Parameters.Add(DbProvider.MakeParam(_DbConfig, "@" + right.SqlConditions, DBNull.Value));
 99             }
100             else
101             {
102                 this._Parameters.Add(DbProvider.MakeParam(_DbConfig, "@" + right.SqlConditions, left.ObjectValue));
103             }
104             return oldRightKey;
105         }
106 
107 
108 
109         private string GetOperator(ExpressionType expressiontype)
110         {
111             switch (expressiontype)
112             {
113                 case ExpressionType.And:
114                 case ExpressionType.AndAlso:
115                     return " AND ";
116                 case ExpressionType.Equal:
117                     return " =";
118                 case ExpressionType.GreaterThan:
119                     return " >";
120                 case ExpressionType.GreaterThanOrEqual:
121                     return ">=";
122                 case ExpressionType.LessThan:
123                     return "<";
124                 case ExpressionType.LessThanOrEqual:
125                     return "<=";
126                 case ExpressionType.NotEqual:
127                     return "<>";
128                 case ExpressionType.Or:
129                 case ExpressionType.OrElse:
130                     return " OR ";
131                 case ExpressionType.Add:
132                 case ExpressionType.AddChecked:
133                     return "+";
134                 case ExpressionType.Subtract:
135                 case ExpressionType.SubtractChecked:
136                     return "-";
137                 case ExpressionType.Divide:
138                     return "/";
139                 case ExpressionType.Multiply:
140                 case ExpressionType.MultiplyChecked:
141                     return "*";
142                 default:
143                     throw new Exception(string.Format("不支持{0}此种运算符查找!", expressiontype.ToString()));
144             }
145         }
146 
147 
148         private ParamInfo GetResolveAll(Expression exp, ref MemberType type, bool isTure = true)
149         {
150             if (exp is LambdaExpression)
151             {
152                 return GetResolveLambda(exp);
153             }
154             else if (exp is BinaryExpression)
155             {
156                 return GetResolveBinary(exp);
157             }
158             else if (exp is MethodCallExpression)
159             {
160                 return GetResolveMethodCall(exp, ref type, isTure);
161             }
162             else if (exp is ConstantExpression)
163             {
164                 return GetResolveConstant(exp, ref type);
165             }
166             else if (exp is MemberExpression)
167             {
168                 return GetResolveMember(exp, ref type);
169             }
170             else if (exp is UnaryExpression)
171             {
172                 return GetResolveUnary(exp, ref type);
173             }
174             return new ParamInfo();
175         }
176         
177         private ParamInfo GetResolveLambda(Expression exp)
178         {
179             LambdaExpression lambda = exp as LambdaExpression;
180             var expression = lambda.Body;
181             MemberType EleType = MemberType.None;
182 
183             if (expression is UnaryExpression)
184             {
185                 var me = expression as UnaryExpression;
186                 if (me.Operand is MemberExpression)
187                 {
188                     var ime = me.Operand as MemberExpression;
189                     return new ParamInfo { SqlConditions = ime.Member.Name.ToString() + "=0" };
190                 }
191             }
192             if (expression is MemberExpression)
193             {
194                 var me = expression as MemberExpression;
195                 return new ParamInfo { SqlConditions = me.Member.Name.ToString() + "=1" };
196             }
197             return GetResolveAll(expression, ref EleType);
198         }
199         private ParamInfo GetResolveBinary(Expression exp)
200         {
201             var expression = exp as BinaryExpression;
202             MemberType leftType = MemberType.None;
203             MemberType rightType = MemberType.None;
204 
205             var left = GetResolveAll(expression.Left, ref leftType);
206             var right = GetResolveAll(expression.Right, ref rightType);
207             var oper = GetOperator(expression.NodeType);
208             var isKeyOperValue = leftType == MemberType.Left && rightType == MemberType.Right;
209             var isValueOperKey = rightType == MemberType.Left && leftType == MemberType.Right;
210 
211             if (leftType == MemberType.Left && rightType == MemberType.None)
212             {
213                 if (expression.Left is UnaryExpression)
214                 {
215                     var me = expression.Left as UnaryExpression;
216                     if (me.Operand is MemberExpression)
217                     {
218                         left.SqlConditions = left.SqlConditions + "=0";
219                     }
220                 }
221                 else if (expression.Left is MemberExpression)
222                 {
223                     left.SqlConditions = left.SqlConditions + "=1";
224                 }
225             }
226             if (leftType == MemberType.None && rightType == MemberType.Left)
227             {
228                 if (expression.Right is UnaryExpression)
229                 {
230                     var me = expression.Right as UnaryExpression;
231                     if (me.Operand is MemberExpression)
232                     {
233                         right.SqlConditions = right.SqlConditions + "=0";
234                     }
235                 }
236                 else if (expression.Right is MemberExpression)
237                 {
238                     right.SqlConditions = right.SqlConditions + "=1";
239                 }
240             }
241 
242             if (isKeyOperValue & (right.ObjectValue == null) && oper.Trim() == "=")
243             {
244                 var oldLeft = AddParametersReturnLeft(ref left, right);
245                 return new ParamInfo { SqlConditions = string.Format(" ({0} is null) ", oldLeft) };
246             }
247             else if (isKeyOperValue & (right.ObjectValue == null) && oper.Trim() == "<>")
248             {
249                 var oldLeft = AddParametersReturnLeft(ref left, right);
250                 return new ParamInfo { SqlConditions = string.Format(" ({0} is not null) ", oldLeft) };
251             }
252             else if (isValueOperKey & (left.ObjectValue == null) && oper.Trim() == "=")
253             {
254                 return new ParamInfo { SqlConditions = string.Format(" ({0} is null) ", right.SqlConditions) };
255             }
256             else if (isValueOperKey & (left.ObjectValue == null) && oper.Trim() == "<>")
257             {
258                 return new ParamInfo { SqlConditions = string.Format(" ({0} is not null) ", right.SqlConditions) };
259             }
260 
261             else if (isKeyOperValue)
262             {
263                 var oldLeft = AddParametersReturnLeft(ref left, right);
264                 return new ParamInfo { SqlConditions = string.Format(" ({0} {1} @{2}) ", oldLeft, oper, left.SqlConditions) };
265             }
266             else if (isValueOperKey)
267             {
268                 var oldRight = AddParametersReturnRight(left, ref right);
269                 return new ParamInfo { SqlConditions = string.Format(" (@{0} {1} {2}) ", right.SqlConditions, oper, oldRight) };
270             }
271             else if (leftType == MemberType.Right && rightType == MemberType.Right)
272             {
273                 return new ParamInfo { SqlConditions = string.Format(" (‘{0}‘ {1} ‘{2}‘) ", left.SqlConditions, oper, right.SqlConditions) };
274             }
275             else
276             {
277                 return new ParamInfo { SqlConditions = string.Format(" ({0} {1} {2}) ", left.SqlConditions, oper, right.SqlConditions) };
278             }
279         }
280         private ParamInfo GetResolveMethodCall(Expression exp, ref MemberType type, bool isTure)
281         {
282             MethodCallExpression mce = (MethodCallExpression)exp;
283             string methodName = mce.Method.Name;
284             if (methodName == "Contains")
285             {
286                 MemberType leftType = MemberType.None;
287                 MemberType rightType = MemberType.None;
288                 if (mce.Method.DeclaringType != typeof(string) && mce.Method.DeclaringType.GetInterface("IEnumerable") != null)
289                 {
290                     var left = GetResolveAll(mce.Arguments[0], ref rightType);
291                     var right = GetResolveAll(mce.Object, ref leftType);
292                     string oldLeftKey = left.SqlConditions;
293 
294                     string leftKey = "P" + ParaIndex + left.SqlConditions;
295                     ParaIndex++;
296                     var sqlParameterNames = "";
297                     var memberType = MemberType.Right;
298                     var list = GetResolveMember(mce.Object as MemberExpression, ref memberType).ObjectValue as IEnumerable;
299                     var count = 1;
300                     foreach (var item in list)
301                     {
302                         var parameterName = leftKey + count;
303                         sqlParameterNames += ",@" + parameterName;
304                         if (item == null)
305                         {
306                             this._Parameters.Add(DbProvider.MakeParam(_DbConfig, "@" + parameterName, DBNull.Value));
307                         }
308                         else
309                         {
310                             this._Parameters.Add(DbProvider.MakeParam(_DbConfig, "@" + parameterName, item));
311                         }
312                         count++;
313                     }
314                     sqlParameterNames = sqlParameterNames.TrimStart(,);
315                     return new ParamInfo { SqlConditions = string.Format("({0} {1} IN ({2}))", oldLeftKey, isTure == false ? "  NOT " : "", sqlParameterNames) };
316                 }
317                 else
318                 {
319                     var left = GetResolveAll(mce.Object, ref leftType);
320                     var right = GetResolveAll(mce.Arguments[0], ref rightType);
321                     var oldLeft = AddParametersReturnLeft(ref left, right);
322                     return new ParamInfo { SqlConditions = string.Format("({0} {1} LIKE ‘%‘[email protected]{2}+‘%‘)", oldLeft, isTure == false ? "  NOT " : "", left.SqlConditions) };
323                 }
324             }
325             else if (methodName == "StartsWith")
326             {
327                 MemberType leftType = MemberType.None;
328                 MemberType rightType = MemberType.None;
329                 var left = GetResolveAll(mce.Object, ref leftType);
330                 var right = GetResolveAll(mce.Arguments[0], ref rightType);
331                 var oldLeft = AddParametersReturnLeft(ref left, right);
332                 return new ParamInfo { SqlConditions = string.Format("({0} {1} LIKE @{2}+‘%‘)", oldLeft, isTure == false ? "  NOT " : "", left.SqlConditions) };
333             }
334             else if (methodName == "EndWith")
335             {
336                 MemberType leftType = MemberType.None;
337                 MemberType rightType = MemberType.None;
338                 var left = GetResolveAll(mce.Object, ref leftType);
339                 var right = GetResolveAll(mce.Arguments[0], ref rightType);
340                 var oldLeft = AddParametersReturnLeft(ref left, right);
341                 return new ParamInfo { SqlConditions = string.Format("({0} {1} LIKE ‘%‘[email protected]{2})", oldLeft, isTure == false ? "  NOT " : "", left.SqlConditions) };
342             }
343             else if (methodName == "ToString")
344             {
345                 type = MemberType.Right;
346                 return GetResolveAll(mce.Object, ref type);
347             }
348             else if (methodName.StartsWith("To"))
349             {
350                 type = MemberType.Right;
351                 return GetResolveAll(mce.Arguments[0], ref type);
352             }
353             return new ParamInfo();
354         }
355 
356         private ParamInfo GetResolveConstant(Expression exp, ref MemberType type)
357         {
358             type = MemberType.Right;
359             ConstantExpression ce = ((ConstantExpression)exp);
360             if (ce.Value == null)
361             {
362                 return new ParamInfo();
363             }
364             else
365             {
366                 return new ParamInfo { ObjectValue = ce.Value };
367             }
368         }
369         private ParamInfo GetResolveUnary(Expression exp, ref MemberType type)
370         {
371             UnaryExpression ue = ((UnaryExpression)exp);
372             var mex = ue.Operand;
373             return GetResolveAll(mex, ref type, false);
374         }
375 
376         private ParamInfo GetResolveMemberMethod(MemberExpression exp)
377         {
378             var proInfo = exp.Member as System.Reflection.PropertyInfo;
379             if (proInfo != null)
380             {
381                 object dynInv = proInfo.GetValue(null, null);
382                 return new ParamInfo { ObjectValue = dynInv };
383             }
384             else
385             {
386                 var fieInfo = exp.Member as System.Reflection.FieldInfo;
387                 if (fieInfo != null)
388                 {
389                     object dynInv = fieInfo.GetValue(null);
390                     return new ParamInfo { ObjectValue = dynInv };
391                 }
392             }
393             return new ParamInfo();
394         }
395         private ParamInfo GetResolveMemberConstant(MemberExpression exp, object obj)
396         {
397             var proInfo = exp.Member as System.Reflection.PropertyInfo;
398             if (proInfo != null)
399             {
400                 var dynInv = proInfo.GetValue(obj, null);
401                 return new ParamInfo { ObjectValue = dynInv };
402             }
403             else
404             {
405                 var fieInfo = exp.Member as System.Reflection.FieldInfo;
406                 if (fieInfo != null)
407                 {
408                     var dynInv = fieInfo.GetValue(obj);
409                     return new ParamInfo { ObjectValue = dynInv };
410                 }
411             }
412             return new ParamInfo();
413         }
414         private ParamInfo GetResolveMember(Expression exp, ref MemberType type)
415         {
416             MemberExpression me = ((MemberExpression)exp);
417             if (me.Expression == null)
418             {
419                 type = MemberType.Right;
420                 return GetResolveMemberMethod(me);
421             }          
422 
423             if (me.Expression.NodeType != ExpressionType.Parameter)
424             {
425                 type = MemberType.Right;
426                 object dynInv = null;
427                 try
428                 {
429                     var conExp = me.Expression as ConstantExpression;
430                     if (conExp != null)
431                     {
432                         return GetResolveMemberConstant(me, conExp.Value);
433                     }
434                     else
435                     {
436                         var memberInfos = new Stack<MemberInfo>();
437                         while (exp is MemberExpression)
438                         {
439                             var memberExpr = exp as MemberExpression;
440                             memberInfos.Push(memberExpr.Member);
441                             exp = memberExpr.Expression;
442                         }
443                         
444                         var constExpr = exp as ConstantExpression;
445                         if (constExpr == null)
446                         {
447                             var member = exp as MemberExpression;
448                             if (member == null)
449                             {
450                                 throw new Exception("不支持的子表达式" + me.Member.Name);
451                             }
452                             return GetResolveMemberMethod(member);
453                         }
454                         var objReference = constExpr.Value;
455 
456                         while (memberInfos.Count > 0)  
457                         {
458                             var mi = memberInfos.Pop();
459                             if (mi.MemberType == MemberTypes.Property)
460                             {
461                                 objReference = objReference.GetType().GetProperty(mi.Name).GetValue(objReference, null);
462                             }
463                             else if (mi.MemberType == MemberTypes.Field)
464                             {
465                                 objReference = objReference.GetType().GetField(mi.Name).GetValue(objReference);
466                             }
467                         }
468                         dynInv = objReference;
469                     }
470                 }
471                 catch (Exception ex)
472                 {
473                     throw new Exception("表达式解析出错(" + me.NodeType.ToString() + "):" + ex.Message);
474                 }
475 
476                 if (dynInv == null)
477                 {
478                     return new ParamInfo();
479                 }
480                 else
481                 {
482                     return new ParamInfo { ObjectValue = dynInv };
483                 }
484             }
485             else
486             {
487                 string name = me.Member.Name;
488                 type = MemberType.Left;
489                 return new ParamInfo { SqlConditions = name };
490             }
491         }
492 
493     }
494 
495 }

 

测试代码如下:

 1 [TestMethod]
 2 public void TestSqlLmdResolve()
 3 {
 4     //ORM数据映射
 5     DbConfig.UseDefaultConfig(new TModelDbConfig(GetDbPath()));
 6 
 7 
 8     var where = GetSqlWhere<cms_category>(m => m.enabled && m.name == "test");
 9     Console.WriteLine("LmdSql1:" + where);
10     where = GetSqlWhere<cms_category>(m => !m.enabled && m.name.Contains("test") && m.enabled);
11     Console.WriteLine("LmdSql2:" + where);
12 
13     //条件优先级
14     where = GetSqlWhere<cms_category>(m => (!m.enabled && m.name.Contains("test") && m.enabled) || m.name.StartsWith("test"));
15     Console.WriteLine("LmdSql3:" + where);
16     where = GetSqlWhere<cms_category>(m => (m.enabled && m.name.Contains("test") && m.enabled) || (m.name.StartsWith("test") && !m.isused && m.isused));
17 
18     //其他判断
19     Console.WriteLine("LmdSql4:" + where);
20     where = GetSqlWhere<cms_category>(m => !m.enabled && m.name.Contains("test") && !m.enabled);
21     Console.WriteLine("LmdSql5:" + where);
22     where = GetSqlWhere<cms_category>(m => !m.enabled && m.name.Contains("test") && m.enabled == true);
23     Console.WriteLine("LmdSql6:" + where);
24     where = GetSqlWhere<cms_category>(m => m.name.Contains("test") && m.enabled || m.name.StartsWith("test"));
25     Console.WriteLine("LmdSql7:" + where);
26     where = GetSqlWhere<cms_category>(m => m.enabled);
27     Console.WriteLine("LmdSql8:" + where);
28     where = GetSqlWhere<cms_category>(m => !m.enabled);
29     Console.WriteLine("LmdSql9:" + where);
30     where = GetSqlWhere<cms_category>(m => m.name.StartsWith("test"));
31     Console.WriteLine("LmdSql10:" + where);
32     where = GetSqlWhere<cms_category>(m => !m.name.StartsWith("test"));
33     Console.WriteLine("LmdSql11:" + where);
34     where = GetSqlWhere<cms_category>(m => m.name.StartsWith("test") || m.name.Contains("test"));
35     Console.WriteLine("LmdSql12:" + where);
36 
37     //条件判断是否前包含,判断常量相等,多层判断
38     var extend = new cms_category_extend();
39     extend.mytest2 = new cms_category_extend();
40     extend.mytest2.mytest1 = new cms_category { name = "hehhe" };
41     where = GetSqlWhere<cms_category>(m => m.name.StartsWith("test") || m.name == cms_category.TestConst ||
42         m.name == extend.mytest2.mytest1.name);
43     Console.WriteLine("LmdSql13:" + where);
44 
45     //判断列表包含
46     var list = new List<string> { "a", "b", "c" };
47     where = GetSqlWhere<cms_category>(m => list.Contains(m.name));
48     Console.WriteLine("LmdSql14:" + where);
49 
50     object testName = "test";
51     where = GetSqlWhere<cms_category>(m => m.enabled && m.name == (string)testName);
52     Console.WriteLine("LmdSql15:" + where);
53     object testParent_id = 1;
54     //枚举判断
55     where = GetSqlWhere<cms_category>(m => (m.id == (int)testParent_id) || (m.enabled && m.parent_id == Status.Success));
56     Console.WriteLine("LmdSql16:" + where);
57 
58     //静态字段判断
59     where = GetSqlWhere<cms_category>(m => m.name == cms_category.TestStatic);
60     Console.WriteLine("LmdSql17:" + where);
61 }
62 
63 private string GetSqlWhere<T>(Expression<Func<T, bool>> expression)
64 {
65     SqlLmdResolver exp = new SqlLmdResolver();
66     exp.ResolveExpression(expression);
67     return exp.SqlWhere + "\\r\\n" + string.Join(",", exp.Parameters.Select(m => m.ParameterName + ":" + m.Value.ToString()));
68 }

 

成品测试如下:

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Collections.Concurrent;
  4 using System.Linq;
  5 using System.Text;
  6 using System.Data;
  7 using System.Data.Common;
  8 using Microsoft.VisualStudio.TestTools.UnitTesting;
  9 
 10 using Util.Database;
 11 using Util.EntityMapping;
 12 using System.Linq.Expressions;
 13 namespace Util.UnitTest
 14 {
 15     [TestClass]
 16     public class TestDatabase_Unit
 17     {
 18 
 19         #region lmd生成sql条件测试
 20 
 21         
 22         [TestMethod]
 23         public void TestSqlLmdResolve()
 24         {
 25             //ORM数据映射
 26             DbConfig.UseDefaultConfig(new TModelDbConfig(GetDbPath()));
 27 
 28 
 29             var where = GetSqlWhere<cms_category>(m => m.enabled && m.name == "test");
 30             Console.WriteLine("LmdSql1:" + where);
 31             where = GetSqlWhere<cms_category>(m => !m.enabled && m.name.Contains("test") && m.enabled);
 32             Console.WriteLine("LmdSql2:" + where);
 33 
 34             //条件优先级
 35             where = GetSqlWhere<cms_category>(m => (!m.enabled && m.name.Contains("test") && m.enabled) || m.name.StartsWith("test"));
 36             Console.WriteLine("LmdSql3:" + where);
 37             where = GetSqlWhere<cms_category>(m => (m.enabled && m.name.Contains("test") && m.enabled) || (m.name.StartsWith("test") && !m.isused && m.isused));
 38 
 39             //其他判断
 40             Console.WriteLine("LmdSql4:" + where);
 41             where = GetSqlWhere<cms_category>(m => !m.enabled && m.name.Contains("test") && !m.enabled);
 42             Console.WriteLine("LmdSql5:" + where);
 43             where = GetSqlWhere<cms_category>(m => !m.enabled && m.name.Contains("test") && m.enabled == true);
 44             Console.WriteLine("LmdSql6:" + where);
 45             where = GetSqlWhere<cms_category>(m => m.name.Contains("test") && m.enabled || m.name.StartsWith("test"));
 46             Console.WriteLine("LmdSql7:" + where);
 47             where = GetSqlWhere<cms_category>(m => m.enabled);
 48             Console.WriteLine("LmdSql8:" + where);
 49             where = GetSqlWhere<cms_category>(m => !m.enabled);
 50             Console.WriteLine("LmdSql9:" + where);
 51             where = GetSqlWhere<cms_category>(m => m.name.StartsWith("test"));
 52             Console.WriteLine("LmdSql10:" + where);
 53             where = GetSqlWhere<cms_category>(m => !m.name.StartsWith("test"));
 54             Console.WriteLine("LmdSql11:" + where);
 55             where = GetSqlWhere<cms_category>(m => m.name.StartsWith("test") || m.name.Contains("test"));
 56             Console.WriteLine("LmdSql12:" + where);
 57 
 58             //条件判断是否前包含,判断常量相等,多层判断
 59             var extend = new cms_category_extend();
 60             extend.mytest2 = new cms_category_extend();
 61             extend.mytest2.mytest1 = new cms_category { name = "hehhe" };
 62             where = GetSqlWhere<cms_category>(m => m.name.StartsWith("test") || m.name == cms_category.TestConst ||
 63                 m.name == extend.mytest2.mytest1.name);
 64             Console.WriteLine("LmdSql13:" + where);
 65 
 66             //判断列表包含
 67             var list = new List<string> { "a", "b", "c" };
 68             where = GetSqlWhere<cms_category>(m => list.Contains(m.name));
 69             Console.WriteLine("LmdSql14:" + where);
 70 
 71             object testName = "test";
 72             where = GetSqlWhere<cms_category>(m => m.enabled && m.name == (string)testName);
 73             Console.WriteLine("LmdSql15:" + where);
 74             object testParent_id = 1;
 75             //枚举判断
 76             where = GetSqlWhere<cms_category>(m => (m.id == (int)testParent_id) || (m.enabled && m.parent_id == Status.Success));
 77             Console.WriteLine("LmdSql16:" + where);
 78 
 79             //静态字段判断
 80             where = GetSqlWhere<cms_category>(m => m.name == cms_category.TestStatic);
 81             Console.WriteLine("LmdSql17:" + where);
 82         }
 83 
 84         private string GetSqlWhere<T>(Expression<Func<T, bool>> expression)
 85         {
 86             SqlLmdResolver exp = new SqlLmdResolver();
 87             exp.ResolveExpression(expression);
 88             return exp.SqlWhere + "\\r\\n" + string.Join(",", exp.Parameters.Select(m => m.ParameterName + ":" + m.Value.ToString()));
 89         }
 90 
 91 
 92         #endregion
 93         
 94         #region access orm测试
 95 
 96         private string GetDbPath()
 97         {
 98             var path = AppDomain.CurrentDomain.BaseDirectory;
 99             if (path.EndsWith("debug", StringComparison.OrdinalIgnoreCase))
100             {
101                 path = path.Substring(0, path.LastIndexOf(\\\\));
102                 path = path.Substring(0, path.LastIndexOf(\\\\));
103                 path = path.Substring(0, path.LastIndexOf(\\\\));
104             }
105             path = path.TrimEnd(\\\\) + @"\\DataBase";
106             return path;
107         }
108         [TestMethod]
109         public void TestDbConfig()
110         {
111             //初始化配置
112             DbConfig.UseDefaultConfig(new TModelDbConfig(GetDbPath()));
113 
114             //T4模版获取数据库信息
115             List<TableInfo> list = DbFactory.GetShemaTables();
116             Console.WriteLine(list.Count.ToString());
117         }
118 
119 
120         [TestMethod]
121         public void TestAccessOrm()
122         {
123 
124             //ORM数据映射
125             DbConfig.UseDefaultConfig(new TModelDbConfig(GetDbPath()));
126             Console.WriteLine("Start loadding...");
127             Console.WriteLine(new cms_category().Query(m => m.name == "城市").ToCount());
128             var cat = new cms_category().Query(m => m.name == "城市").SortAsc(m => m.name).ToModel();
129             Console.WriteLine(cat.name);
130 
131             //设置只更新部分
132             //cat.SetPartHandled();
133             //cat.description = "test";
134             //cat.Update(m=>m.id == 1);
135 
136             Console.WriteLine(cat.ToValue(m => m.name));
137             Console.WriteLine(new cms_category().Query(m => m.name == "城市").ToList()[0].name);
138             Console.WriteLine(new cms_category().Query(m => m.name == "城市" && m.id > 0 && m.name == "" || (m.id == 0 || m.name == "")).ToCount());
139             //指定条件规则查询
140             Console.WriteLine(new cms_category().Query(m => (m.name == "城市" && (m.id > 0 || m.name == "")) || (m.id == 0 || m.name == "")).ToCount());
141 
142             var cityList = new List<string> { "城市", "b", "c" };
143             var layer = new LayerModel { List = cityList };
144             Console.WriteLine(new cms_category().Query(m => m.name == "城市" || cityList.Contains(m.name) || m.parent_id == Status.Success).ToCount());
145             Console.WriteLine(new cms_category().Query(m => m.name == "城市" || layer.List.Contains(m.name)).ToCount());
146             
147 
148             //获取全部
149             var datsList = new cms_category().Query().ToList();
150             Console.WriteLine(datsList.Count);
151             //获取N条
152             datsList = new cms_category().Query().ToList(6);
153             Console.WriteLine(datsList.Count);
154             //获取部分
155             var partList = new cms_category().Query().ToPartList(6, "id", "name").Select(m => new cms_category
156             {
157                 id = int.Parse(m[0]),
158                 name = m[1]
159             }).ToList();
160             Console.WriteLine(partList.Count);
161             //分页查询
162             var mapper = new cms_category().Query();
163             var dataCount = mapper.ToCount();
164             datsList = mapper.ToList(20, 1, dataCount);
165             Console.WriteLine(datsList.Count);
166             //条件拼接查询
167             mapper.And(m => m.name == "test")
168                 .And(m => m.id > 0)
169                 .Or(m => m.parent_id > 0);
170             mapper.Or(m => m.parent_id > 0);
171 
172 
173 
174             var channels = new cms_channel().Query().ToList();
175             Console.WriteLine(channels.Count);
176             var grade = new ucl_grade { id = 5 };
177             grade.grade_name = "新手1";
178             var dal = new UclGradeDataAccess(grade);
179             //保持数据库连接
180             using (var db = new DbBuilder(new TModelDbConfig(GetDbPath())).KeepConnect())
181             {
182                 //使用数据库db操作并跟踪实体修改状态
183                 dal.UseDatabase(db).SetPartHandled();
184                 grade.grade = 8;
185                 grade.grade_name = "新手";
186                 dal.Update();
187             }
188             //db销毁后重连数据库
189             Console.WriteLine(dal.ToValue(m => m.grade_name));
190 
191 
192             //使用事务(在事务中处理)
193             using (var db = new DbBuilder(new TModelDbConfig(GetDbPath())).KeepConnect())
194             {
195                 try
196                 {
197                     db.BeginTransaction();
198                     //TODO:something
199                     //使用数据库db操作并跟踪实体修改状态
200                     dal.UseDatabase(db).SetPartHandled();
201                     grade.grade = 8;
202                     grade.grade_name = "新手";
203                     dal.Update();
204                     db.CommitTransaction();
205                 }
206                 catch (Exception ex)
207                 {
208                     db.RollbackTransaction();
209                 }
210             }
211             
212             //使用事务(批处理事务)
213             var parList = new List<DbParamInfo>();
214             //添加到批处理事务中,如果执行失败则回滚事务
215             parList.Add(dal.GetUpdateDbParamInfo().UseVerifyExecResult());
216             //TODO:添加其他操作到parList
217             var execCount = new DbBuilder(new TModelDbConfig(GetDbPath())).ExecuteSqlTran(parList);
218             Console.WriteLine(execCount);
219         }
220 
221 
222         [TestMethod]
223         public void TestMappingField()
224         {
225             var cat = new cms_category();
226             var watch = System.Diagnostics.Stopwatch.StartNew();
227             var eachCount = 100000;
228             for (var i = 0; i < eachCount; i++)
229             {
230                 var field = new cms_category().ExpField(f => f.name);
231             }
232             watch.Stop();
233             Console.WriteLine("Linq反射取" + eachCount + "次字段毫秒数:" + watch.ElapsedMilliseconds);
234         }
235 
236 
237 
238         //===============================================================================================
239         //access 测试配置类
240         //===============================================================================================
241         public class TModelDbConfig : DbConfig
242         {
243             public static void DBWriteLogInfo(string info, string title, string logpath, string encoding)
244             {
245                 Console.WriteLine("dblog:" + info);
246             }
247             public TModelDbConfig(string solutionDir) : base("System.Data.OleDb",
248                 @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + solutionDir + @"\\PlugNT_CMS.mdb;User ID=;Password=;",
249                 DBWriteLogInfo)
250             { }
251 
252         }
253 
254 
255         [Table("cms_channel")]
256         public partial class cms_channel : BaseMapper<cms_channel>
257         {
258             public int id { get; set; }
259             public string no { get; set; }
260             public string title { get; set; }
261         }
262         public class LayerModel
263         {
264             public List<string> List { get; set; }
265         }
266         public partial class cms_category : BaseMapper<cms_category>
267         {
268 
269             public static string TestStatic = "TestStatic";
270             public const string TestConst = "TestConst";
271 
272             public int id { get; set; }
273             public string name { get; set; }
274             //public int parent_id { get; set; }
275             public Status parent_id { get; set; }
276 
277             [Obsolete("test")]
278             public bool enabled { get; set; }
279             [Obsolete("test")]
280             public bool isused { get; set; }
281 
282             
283             public override string TableName
284             {
285                 get { return "cms_category"; }
286             }
287             protected override cms_category ConvertEntity(IDataReader reader)
288             {
289                 return new cms_category
290                 {
291                     id = int.Parse(reader["id"].ToString()),
292                     name = reader["name"].ToString(),
293                     parent_id = (Status)int.Parse(reader["parent_id"].ToString()),
294                 };
295             }
296             protected override List<DbFieldInfo> ConvertFields(cms_category model)
297             {
298                 return new List<DbFieldInfo>
299                 {
300                     new DbFieldInfo { Name = "id", Value = model.id , IsIdentity =true },
301                     new DbFieldInfo { Name = "name", Value = model.name  },
302                     new DbFieldInfo { Name = "parent_id", Value = model.parent_id  },
303                 };
304             }
305         }
306 
307         public class cms_category_extend : cms_category
308         {
309             public cms_category mytest1 { get; set; }
310             public cms_category_extend mytest2 { get; set; }
311             public string myname { get; set; }
312         }
313         public class ucl_grade
314         {
315             public int id { get; set; }
316             public int grade { get; set; }
317             public string grade_name { get; set; }
318         }
319 
320         public class UclGradeDataAccess : BaseMapper<ucl_grade>
321         {
322             public UclGradeDataAccess(ucl_grade model = null)
323             {
324                 ContextEntity = model;
325             }
326             public override string TableName
327             {
328                 get { return "ucl_grade"; }
329             }
330             protected override ucl_grade ConvertEntity(IDataReader reader)
331             {
332                 return new ucl_grade
333                 {
334                     id = int.Parse(reader["id"].ToString()),
335                     grade = int.Parse(reader["grade"].ToString()),
336                     grade_name = reader["grade_name"].ToString(),
337                 };
338             }
339             protected override List<DbFieldInfo> ConvertFields(ucl_grade model)
340             {
341                 return new List<DbFieldInfo>
342                 {
343                     new DbFieldInfo { Name = "id", Value = model.id , IsPrimaryKey =true , IsIdentity =true },
344                     new DbFieldInfo { Name = "grade", Value = model.grade  },
345                     new DbFieldInfo { Name = "grade_name", Value = model.grade_name  },
346                 };
347             }
348         }
349         public enum Status
350         {
351             Success
352         }
353         
354         #endregion
355         
356     }
357 }

 

部分测试截图:

技术图片

技术图片
OrmM成品开源项目地址
https://github.com/PlugNT/util6

官方网址:

https://www.util6.com

 

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