Add Queryable.Distinct()

Src/Asp.Net/SqlServerTest/Demos/1_Query.cs

@@ -395,6 +395,8 @@ namespace OrmTest.Demo
             bool? b = false;
             var test9 = db.Queryable<DataTestInfo2>().Where(it => it.Bool1 == b).ToList();
             var test10 = db.Queryable<Student>(db.Queryable<Student>().Select(it => new Student() { Name = it.Name.Substring(0, 1) })).GroupBy(it => it.Name).ToList(); ;
+            var test11 = db.Queryable<Student>().Distinct().ToList();
+            var test12 = db.Queryable<Student>().Distinct().Select(it=>new Student{ Name=it.Name  }).ToList();
         }
         public static void Page()
         {

Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs

@@ -573,6 +573,11 @@ namespace SqlSugar
             return mergeQueryable.AS(tableName).Select<T>("*");
         }
 
+        public ISugarQueryable<T> Distinct()
+        {
+            QueryBuilder.IsDistinct = true;
+            return this;
+        }
         public virtual int Count()
         {
             InitMapping();
@@ -1588,6 +1593,7 @@ namespace SqlSugar
             asyncQueryableBuilder.TableShortName = this.QueryBuilder.TableShortName;
             asyncQueryableBuilder.TableWithString = this.QueryBuilder.TableWithString;
             asyncQueryableBuilder.GroupByValue = this.QueryBuilder.GroupByValue;
+            asyncQueryableBuilder.IsDistinct = this.QueryBuilder.IsDistinct;
             asyncQueryableBuilder.OrderByValue = this.QueryBuilder.OrderByValue;
             asyncQueryableBuilder.IsDisabledGobalFilter = this.QueryBuilder.IsDisabledGobalFilter;
             asyncQueryableBuilder.PartitionByValue = this.QueryBuilder.PartitionByValue;
@@ -1596,6 +1602,7 @@ namespace SqlSugar
             asyncQueryableBuilder.HavingInfos = this.QueryBuilder.HavingInfos;
             asyncQueryableBuilder.LambdaExpressions.ParameterIndex = this.QueryBuilder.LambdaExpressions.ParameterIndex;
         }
+
         #endregion
     }
     #endregion
@@ -1897,6 +1904,11 @@ namespace SqlSugar
             this.QueryBuilder.WhereInfos.Remove(this.QueryBuilder.WhereInfos.Last());
             return result;
         }
+        public new ISugarQueryable<T,T2> Distinct()
+        {
+            QueryBuilder.IsDistinct = true;
+            return this;
+        }
         #endregion
     }
     #endregion
@@ -2261,6 +2273,11 @@ namespace SqlSugar
             this.QueryBuilder.WhereInfos.Remove(this.QueryBuilder.WhereInfos.Last());
             return result;
         }
+        public new ISugarQueryable<T, T2,T3> Distinct()
+        {
+            QueryBuilder.IsDistinct = true;
+            return this;
+        }
         #endregion
     }
     #endregion
@@ -2683,6 +2700,11 @@ namespace SqlSugar
             this.QueryBuilder.WhereInfos.Remove(this.QueryBuilder.WhereInfos.Last());
             return result;
         }
+        public new ISugarQueryable<T, T2, T3,T4> Distinct()
+        {
+            QueryBuilder.IsDistinct = true;
+            return this;
+        }
         #endregion
     }
     #endregion
@@ -3032,6 +3054,11 @@ namespace SqlSugar
             this.QueryBuilder.WhereInfos.Remove(this.QueryBuilder.WhereInfos.Last());
             return result;
         }
+        public new ISugarQueryable<T, T2, T3, T4,T5> Distinct()
+        {
+            QueryBuilder.IsDistinct = true;
+            return this;
+        }
         #endregion
     }
     #endregion
@@ -3412,6 +3439,11 @@ namespace SqlSugar
             this.QueryBuilder.WhereInfos.Remove(this.QueryBuilder.WhereInfos.Last());
             return result;
         }
+        public new ISugarQueryable<T, T2, T3, T4, T5,T6> Distinct()
+        {
+            QueryBuilder.IsDistinct = true;
+            return this;
+        }
         #endregion
     }
     #endregion
@@ -3823,6 +3855,11 @@ namespace SqlSugar
             this.QueryBuilder.WhereInfos.Remove(this.QueryBuilder.WhereInfos.Last());
             return result;
         }
+        public new ISugarQueryable<T, T2, T3, T4, T5, T6,T7> Distinct()
+        {
+            QueryBuilder.IsDistinct = true;
+            return this;
+        }
         #endregion
     }
     #endregion
@@ -4267,6 +4304,11 @@ namespace SqlSugar
             this.QueryBuilder.WhereInfos.Remove(this.QueryBuilder.WhereInfos.Last());
             return result;
         }
+        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7,T8> Distinct()
+        {
+            QueryBuilder.IsDistinct = true;
+            return this;
+        }
         #endregion
     }
     #endregion

Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs

@@ -49,6 +49,7 @@ namespace SqlSugar
         public string GroupByValue { get; set; }
         public string PartitionByValue { get; set; }
         public int WhereIndex { get; set; }
+        public bool IsDistinct { get; set; }
         public int JoinIndex { get; set; }
         public bool IsDisabledGobalFilter { get; set; }
         public virtual List<SugarParameter> Parameters { get; set; }
@@ -363,6 +364,7 @@ namespace SqlSugar
             this._TableNameString = null;
             this.WhereInfos = null;
             this.JoinQueryInfos = null;
+            this.IsDistinct = false;
         }
         public virtual bool IsComplexModel(string sql)
         {
@@ -388,6 +390,10 @@ namespace SqlSugar
                 {
                     this.SelectCacheKey = this.SelectCacheKey + string.Join("-", this._JoinQueryInfos.Select(it => it.TableName));
                 }
+                if (IsDistinct)
+                {
+                    result = " DISTINCT " + result;
+                }
                 return result;
             }
         }

Src/Asp.Net/SqlSugar/Interface/IQueryable.cs

@@ -74,6 +74,7 @@ namespace SqlSugar
 
         ISugarQueryable<T> Skip(int index);
         ISugarQueryable<T> Take(int num);
+        ISugarQueryable<T> Distinct();
 
         T Single();
         Task<T> SingleAsync();
@@ -221,6 +222,7 @@ namespace SqlSugar
         new ISugarQueryable<T, T2> With(string withString);
         new ISugarQueryable<T, T2> WithCache(int cacheDurationInSeconds = int.MaxValue);
         new ISugarQueryable<T, T2> WithCacheIF(bool isCache, int cacheDurationInSeconds = int.MaxValue);
+        new ISugarQueryable<T,T2> Distinct();
         bool Any(Expression<Func<T,T2, bool>> expression);
         #endregion
     }
@@ -311,6 +313,7 @@ namespace SqlSugar
         new ISugarQueryable<T, T2, T3> With(string withString);
         new ISugarQueryable<T, T2, T3> WithCache(int cacheDurationInSeconds = int.MaxValue);
         new ISugarQueryable<T, T2, T3> WithCacheIF(bool isCache, int cacheDurationInSeconds = int.MaxValue);
+        new ISugarQueryable<T, T2,T3> Distinct();
         bool Any(Expression<Func<T, T2,T3, bool>> expression);
         #endregion
     }
@@ -412,6 +415,7 @@ namespace SqlSugar
         new ISugarQueryable<T, T2, T3, T4> With(string withString);
         new ISugarQueryable<T, T2, T3, T4> WithCache(int cacheDurationInSeconds = int.MaxValue);
         new ISugarQueryable<T, T2, T3, T4> WithCacheIF(bool isCache, int cacheDurationInSeconds = int.MaxValue);
+        new ISugarQueryable<T, T2, T3,T4> Distinct();
         bool Any(Expression<Func<T, T2, T3,T4, bool>> expression);
         #endregion
     }
@@ -503,6 +507,7 @@ namespace SqlSugar
         new ISugarQueryable<T, T2, T3, T4, T5> With(string withString);
         new ISugarQueryable<T, T2, T3, T4, T5> WithCache(int cacheDurationInSeconds = int.MaxValue);
         new ISugarQueryable<T, T2, T3, T4, T5> WithCacheIF(bool isCache, int cacheDurationInSeconds = int.MaxValue);
+        new ISugarQueryable<T, T2, T3, T4,T5> Distinct();
         bool Any(Expression<Func<T, T2, T3, T4,T5, bool>> expression);
         #endregion
     }
@@ -600,6 +605,7 @@ namespace SqlSugar
         new ISugarQueryable<T, T2, T3, T4, T5, T6> With(string withString);
         new ISugarQueryable<T, T2, T3, T4, T5, T6> WithCache(int cacheDurationInSeconds = int.MaxValue);
         new ISugarQueryable<T, T2, T3, T4, T5, T6> WithCacheIF(bool isCache, int cacheDurationInSeconds = int.MaxValue);
+        new ISugarQueryable<T, T2, T3, T4, T5,T6> Distinct();
         bool Any(Expression<Func<T, T2, T3, T4, T5,T6, bool>> expression);
         #endregion
     }
@@ -703,6 +709,7 @@ namespace SqlSugar
         new ISugarQueryable<T, T2, T3, T4, T5, T6, T7> With(string withString);
         new ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WithCache(int cacheDurationInSeconds = int.MaxValue);
         new ISugarQueryable<T, T2, T3, T4, T5, T6, T7> WithCacheIF(bool isCache, int cacheDurationInSeconds = int.MaxValue);
+        new ISugarQueryable<T, T2, T3, T4, T5, T6,T7> Distinct();
         bool Any(Expression<Func<T, T2, T3, T4, T5, T6,T7, bool>> expression);
         #endregion
     }
@@ -812,6 +819,7 @@ namespace SqlSugar
         new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> With(string withString);
         new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WithCache(int cacheDurationInSeconds = int.MaxValue);
         new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> WithCacheIF(bool isCache, int cacheDurationInSeconds = int.MaxValue);
+        new ISugarQueryable<T, T2, T3, T4, T5, T6, T7,T8> Distinct();
         bool Any(Expression<Func<T, T2, T3, T4, T5, T6, T7,T8, bool>> expression);
         #endregion
     }

Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlQueryBuilder.cs

@@ -84,6 +84,10 @@ namespace SqlSugar
                 {
                     this.SelectCacheKey = this.SelectCacheKey + string.Join("-", this.JoinQueryInfos.Select(it => it.TableName));
                 }
+                if (IsDistinct)
+                {
+                    result = " DISTINCT " + result;
+                }
                 return result;
             }
         }

Src/Asp.Net/SqlSugar/Realization/Sqlite/SqlBuilder/SqliteQueryBuilder.cs

@@ -84,6 +84,10 @@ namespace SqlSugar
                 {
                     this.SelectCacheKey = this.SelectCacheKey + string.Join("-", this.JoinQueryInfos.Select(it => it.TableName));
                 }
+                if (IsDistinct)
+                {
+                    reval = " DISTINCT " + reval;
+                }
                 return reval;
             }
         }