Update mongodb

Src/Asp.NetCore2/SqlSugar.MongoDbCore/ExpToSql/VisitorItems/BinaryExpressionTranslator/Root.cs

@@ -22,12 +22,31 @@ namespace SqlSugar.MongoDb
 
         public BsonDocument Extract(BinaryExpression expr)
         {
-            if (IsLogicalExpression(expr))
+            if (IsValidJsonEqualityExpression(expr))
+                return JsonEqualityExpression(expr);
+            else if (IsLogicalExpression(expr))
                 return LogicalBinaryExpression(expr);
             else
                 return FieldComparisonOrCalculationExpression(expr);
         }
 
+        private BsonDocument JsonEqualityExpression(BinaryExpression expr)
+        {
+            var fieldName = new ExpressionVisitor(_context).Visit(expr.Left); 
+
+            // 步骤3：获取右侧常量值
+            object rightValue = ExpressionTool.DynamicInvoke(expr.Right);
+
+            var builder=InstanceFactory.GetInsertBuilder(this._context.context.CurrentConnectionConfig);
+            var json=builder.SerializeObjectFunc(rightValue); 
+            return new BsonDocument(fieldName+"",UtilMethods.ParseJsonObject(json));
+        }
+
+        private bool IsValidJsonEqualityExpression(BinaryExpression expr)
+        {
+            return this._context?.context != null && expr.NodeType == ExpressionType.Equal && UtilMethods.IsJsonMember(expr.Left, this._context?.context) && ExpressionTool.GetParameters(expr.Right).Count == 0;
+        }
+
         private static bool IsLogicalExpression(BinaryExpression expr)
         {
             return expr.NodeType == ExpressionType.AndAlso || expr.NodeType == ExpressionType.OrElse;

Src/Asp.NetCore2/SqlSugar.MongoDbCore/Tools/UtilMethods.cs

@@ -21,6 +21,19 @@ namespace SqlSugar.MongoDb
 {
     public class UtilMethods
     {
+        internal static bool IsJsonMember(Expression expression, SqlSugarProvider context)
+        {  
+            var member = expression as MemberExpression;
+            if (member == null)
+                return false;
+            if (!(member.Type.IsClass())||member.Type==typeof(string))
+                return false;
+            if (member.Expression == null)
+                return false;
+            var entity = context.EntityMaintenance.GetEntityInfo(member.Expression.Type);
+            var json = entity.Columns.FirstOrDefault(z => z.IsJson && z.PropertyName == member.Member.Name);
+            return json != null;
+        }
         internal static SugarParameter GetParameterConverter(int index, ISqlSugarClient db, object value, Expression oppoSiteExpression, EntityColumnInfo columnInfo)
         {
             var entity = db.EntityMaintenance.GetEntityInfo(oppoSiteExpression.Type);