-

OrmTest/Program.cs

@@ -16,7 +16,7 @@ namespace OrmTest
     {
         static void Main(string[] args)
         {
-            Expression<Func<Student, bool>> exp = it => it.Name!="";
+            Expression<Func<Student, bool>> exp = it => it.Name!="a";
             ExpressionContext expContext = new ExpressionContext(exp, ResolveExpressType.Single);
            // var x = expContext.GetFiledName();
             var xx = expContext.ToString();

SqlSugar/ExpressionsToSql/ExpressionConst.cs

@@ -13,6 +13,8 @@ namespace SqlSugar
         public const string Format1 = "{1}";
         public readonly static Type MemberExpressionType = typeof(MemberExpression);
         public readonly static Type ConstantExpressionType = typeof(ConstantExpression);
+        public readonly static Type StringType = typeof(string);
+
         internal static string GetThrowMessage(string enMessage, string cnMessage, params string[] args)
         {
             List<string> formatArgs = new List<string>() { enMessage, cnMessage };

SqlSugar/ExpressionsToSql/ResolveItems/BinaryExpressionResolve.cs

@@ -28,7 +28,7 @@ namespace SqlSugar
             string leftString = GetLeftString(parameter);
             string rightString = GetRightString(parameter);
             string binarySql =string.Format(ExpressionConst.BinaryFormatString,leftString,operatorValue,rightString);
-            string sqlWhereString = base.SqlWhere.ToString();
+            string sqlWhereString = base.SqlWhere.ObjToString();
             if (base.SqlWhere == null) {
                 base.SqlWhere = new StringBuilder();
             }
@@ -50,21 +50,31 @@ namespace SqlSugar
         {
             var leftInfo = parameter.BinaryExpressionInfoList.Single(it => it.Value.IsLeft).Value;
             var rightInfo = parameter.BinaryExpressionInfoList.Single(it => !it.Value.IsLeft).Value;
-            if (leftInfo.ExpressionType == ExpressionConst.ConstantExpressionType)
+            if (rightInfo.ExpressionType == ExpressionConst.ConstantExpressionType)
             {
                 var sqlParameterKeyWord = parameter.Context.SqlParameterKeyWord;
-                var reval= string.Format("{0}{1}{2}",sqlParameterKeyWord,leftInfo.Value,parameter.Context.Index+parameter.Index);
-                parameter.Context.Parameters.Add(new SugarParameter(reval,leftInfo.Value));
+                var reval = string.Format("{0}{1}{2}", sqlParameterKeyWord, leftInfo.Value, parameter.Context.Index + parameter.Index);
+                if (parameter.Context.Parameters == null) {
+                    parameter.Context.Parameters = new List<SugarParameter>();
+                }
+                parameter.Context.Parameters.Add(new SugarParameter(reval, rightInfo.Value));
                 return reval;
             }
-            return leftInfo.Value.ObjToString();
+            return rightInfo.Value.ObjToString();
         }
 
         private string GetLeftString(ExpressionParameter parameter)
         {
             var leftInfo = parameter.BinaryExpressionInfoList.Single(it => it.Value.IsLeft).Value;
             var rightInfo = parameter.BinaryExpressionInfoList.Single(it => !it.Value.IsLeft).Value;
-            return rightInfo.Value.ObjToString();
+            if (leftInfo.ExpressionType == ExpressionConst.ConstantExpressionType)
+            {
+                var sqlParameterKeyWord = parameter.Context.SqlParameterKeyWord;
+                var reval = string.Format("{0}{1}{2}", sqlParameterKeyWord, leftInfo.Value, parameter.Context.Index + parameter.Index);
+                parameter.Context.Parameters.Add(new SugarParameter(reval, leftInfo.Value));
+                return reval;
+            }
+            return leftInfo.Value.ObjToString();
         }
     }
 }

SqlSugar/ExpressionsToSql/ResolveItems/ConstantExpressionResolve.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
+using System.Reflection;
 using System.Text;
 namespace SqlSugar
 {
@@ -9,15 +10,15 @@ namespace SqlSugar
     {
         public ConstantExpressionResolve(ExpressionParameter parameter) : base(parameter)
         {
-            var expression = base.Expression as MemberExpression;
+            var expression = base.Expression as ConstantExpression;
             var isLeft = parameter.IsLeft;
             var isSingle = parameter.Context.IsSingle;
-            string value = string.Empty;
+            object value = expression.Value;
             if (parameter.BaseParameter.BinaryExpressionInfoList != null)
             {
                 parameter.BaseParameter.BinaryExpressionInfoList.Add(new KeyValuePair<string, BinaryExpressionInfo>(ExpressionConst.BinaryExpressionInfoListKey, new BinaryExpressionInfo()
                 {
-                    IsLeft = Convert.ToBoolean(IsLeft),
+                    IsLeft = Convert.ToBoolean(isLeft),
                     Value = value,
                     ExpressionType = expression.GetType()
                 }));
@@ -28,5 +29,105 @@ namespace SqlSugar
                 base.SqlWhere.Append(value);
             }
         }
+
+        //private object GetValue(MemberInfo member, Expression expression)
+        //{
+        //    var memberInfos = new Stack<MemberInfo>();
+        //    var fieldInfo = member as System.Reflection.FieldInfo;
+        //    object dynInv = null;
+        //    // "descend" toward's the root object reference:
+        //    while (expression is MemberExpression)
+        //    {
+        //        var memberExpr = expression as MemberExpression;
+        //        memberInfos.Push(memberExpr.Member);
+        //        if (memberExpr.Expression == null)
+        //        {
+        //            if (memberExpr.Member.MemberType == MemberTypes.Property)
+        //            {
+        //                PropertyInfo pro = (PropertyInfo)memberExpr.Member;
+        //                dynInv = pro.GetValue(memberExpr.Member, null);
+        //                if (dynInv != null && dynInv.GetType().IsClass)
+        //                {
+        //                    var fieldName = memberExpr.Member.Name;
+        //                    var proInfo = dynInv.GetType().GetProperty(fieldName);
+        //                    if (proInfo != null)
+        //                    {
+        //                        dynInv = proInfo.GetValue(dynInv, null);
+        //                    }
+        //                    var fieInfo = dynInv.GetType().GetField(fieldName);
+        //                    if (fieInfo != null)
+        //                    {
+        //                        dynInv = fieInfo.GetValue(dynInv);
+        //                    }
+        //                    if (fieInfo == null && proInfo == null)
+        //                    {
+
+        //                    }
+        //                }
+        //            }
+        //            else if (memberExpr.Member.MemberType == MemberTypes.Field)
+        //            {
+        //                FieldInfo field = (FieldInfo)memberExpr.Member;
+        //                dynInv = field.GetValue(memberExpr.Member);
+        //                if (dynInv != null && dynInv.GetType().IsClass && dynInv.GetType() != ExpressionConst.StringType)
+        //                {
+        //                    var fieldName = memberExpr.Member.Name;
+        //                    var proInfo = dynInv.GetType().GetProperty(fieldName);
+        //                    if (proInfo != null)
+        //                    {
+        //                        dynInv = proInfo.GetValue(dynInv, null);
+        //                    }
+        //                    var fieInfo = dynInv.GetType().GetField(fieldName);
+        //                    if (fieInfo != null)
+        //                    {
+        //                        dynInv = fieInfo.GetValue(dynInv);
+        //                    }
+        //                    if (fieInfo == null && proInfo == null)
+        //                    {
+
+        //                    }
+        //                }
+        //            }
+        //        }
+        //        if (memberExpr.Expression == null)
+        //        {
+
+        //        }
+        //        expression = memberExpr.Expression;
+        //    }
+
+        //    // fetch the root object reference:
+        //    var constExpr = expression as ConstantExpression;
+        //    if (constExpr == null)
+        //    {
+
+        //    }
+        //    var objReference = constExpr.Value;
+
+        //    // "ascend" back whence we came from and resolve object references along the way:
+        //    while (memberInfos.Count > 0)  // or some other break condition
+        //    {
+        //        var mi = memberInfos.Pop();
+        //        if (mi.MemberType == MemberTypes.Property)
+        //        {
+        //            var objProp = objReference.GetType().GetProperty(mi.Name);
+        //            if (objProp == null)
+        //            {
+
+        //            }
+        //            objReference = objProp.GetValue(objReference, null);
+        //        }
+        //        else if (mi.MemberType == MemberTypes.Field)
+        //        {
+        //            var objField = objReference.GetType().GetField(mi.Name);
+        //            if (objField == null)
+        //            {
+
+        //            }
+        //            objReference = objField.GetValue(objReference);
+        //        }
+        //    }
+        //    return dynInv;
+        //}
     }
 }

SqlSugar/ExpressionsToSql/ResolveItems/MemberExpressionResolve.cs

@@ -17,7 +17,7 @@ namespace SqlSugar
             if (parameter.BaseParameter.BinaryExpressionInfoList != null)
                 parameter.BaseParameter.BinaryExpressionInfoList.Add(new KeyValuePair<string, BinaryExpressionInfo>(ExpressionConst.BinaryExpressionInfoListKey, new BinaryExpressionInfo()
                 {
-                    IsLeft = Convert.ToBoolean(IsLeft),
+                    IsLeft = Convert.ToBoolean(isLeft),
                     Value = fieldName,
                     ExpressionType = expression.GetType()
                 }));