Update demo

Src/Asp.Net/SqlServerTest/1_CodeFirst.cs

@@ -1,6 +1,7 @@
 using SqlSugar;
 using System;
 using System.Collections.Generic;
+using System.Data.Linq;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -28,6 +29,10 @@ namespace OrmTest
             // 根据 UserInfo001 实体类初始化表
             db.CodeFirst.InitTables<UserInfo001>();
 
+            //Table structure and class are different
+            //表结构和类存在差异 初始化表
+            db.CodeFirst.InitTables<UserInfo002>();
+
             //Insert
             //插入
             var id=db.Insertable(new UserInfo001()
@@ -101,5 +106,30 @@ namespace OrmTest
             [SugarColumn(IsNullable = true)]
             public DateTime? RegistrationDate { get; set; }
         }
+
+
+        /// <summary>
+        /// User information entity class
+        /// 用户信息实体类
+        /// </summary> 
+        [SugarTable("UserInfoA")]
+        public class UserInfo002
+        {
+            /// <summary>
+            /// User ID (Primary Key)
+            /// 用户ID（主键）
+            /// </summary>
+            [SugarColumn(IsIdentity = true,ColumnName ="Id", IsPrimaryKey = true)]
+            public int UserId { get; set; }
+
+            /// <summary>
+            /// User name
+            /// 用户名
+            /// </summary>
+            [SugarColumn(Length = 50,ColumnName ="Name", IsNullable = false)]
+            public string UserName { get; set; }
+
+           
+        }
     }
 }

Src/Asp.Net/SqlServerTest/3_EasyQuery.cs

@@ -0,0 +1,137 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SqlSugar;
+namespace OrmTest 
+{
+    internal class _3_EasyQuery
+    {
+      
+
+        public static void Init() 
+        {
+
+            CreateTable();
+            GetAllStudents();
+            GetStudentCount();
+            GetStudentsByCondition();
+            GetStudentsByName("jack");
+            GetStudentById(1);
+            GetMaxStudentId();
+            GetStudentsOrderedByIdDesc();
+            GetStudentNames();
+        }
+
+        private static void CreateTable()
+        {
+            SqlSugarClient db = DbHelper.GetNewDb();
+            db.CodeFirst.InitTables<Student03>();
+            db.Insertable(new Student03() { Name = "name" + SnowFlakeSingle.Instance.NextId() })
+                .ExecuteCommand();
+        }
+
+        // 查询所有学生信息
+        // Query all student records
+        public  static List<Student03> GetAllStudents()
+        {
+            SqlSugarClient db = DbHelper.GetNewDb();
+            return db.Queryable<Student03>().ToList();
+        }
+
+        // 查询学生总数
+        // Get the total count of students
+        public static int GetStudentCount()
+        {
+            SqlSugarClient db = DbHelper.GetNewDb();
+            return db.Queryable<Student03>().Count();
+        }
+
+        // 按条件查询学生信息
+        // Query student records based on conditions
+        public static List<Student03> GetStudentsByCondition()
+        {
+            SqlSugarClient db = DbHelper.GetNewDb();
+
+            // 查询Id为1的学生
+            // Query students with Id equal to 1
+            var studentsWithId1 = db.Queryable<Student03>().Where(it => it.Id == 1).ToList();
+
+            // 查询name字段不为null的学生
+            // Query students where the 'name' field is not null
+            var studentsWithNameNotNull = db.Queryable<Student03>().Where(it => it.Name != null).ToList();
+
+            // 查询name字段为null的学生
+            // Query students where the 'name' field is null
+            var studentsWithNameNull = db.Queryable<Student03>().Where(it => it.Name == null).ToList();
+
+            // 查询name字段不为空的学生
+            // Query students where the 'name' field is not empty
+            var studentsWithNameNotEmpty = db.Queryable<Student03>().Where(it => it.Name != "").ToList();
+
+            // 多条件查询
+            // Query students with multiple conditions
+            var studentsWithMultipleConditions = db.Queryable<Student03>().Where(it => it.Id > 10 && it.Name == "a").ToList();
+
+            // 动态OR查询
+            // Dynamic OR query
+            var exp = Expressionable.Create<Student03>();
+            exp.OrIF(true, it => it.Id == 1);
+            exp.Or(it => it.Name.Contains("jack"));
+            var studentsWithDynamicOr = db.Queryable<Student03>().Where(exp.ToExpression()).ToList();
+
+            return studentsWithDynamicOr;
+        }
+
+        // 模糊查询
+        // Fuzzy search
+        public static List<Student03> GetStudentsByName(string keyword)
+        {
+            SqlSugarClient db = DbHelper.GetNewDb();
+            return db.Queryable<Student03>().Where(it => it.Name.Contains(keyword)).ToList();
+        }
+
+        // 根据主键查询单个学生
+        // Query a single student by primary key
+        public static Student03 GetStudentById(int id)
+        {
+            SqlSugarClient db = DbHelper.GetNewDb();
+            return db.Queryable<Student03>().Single(it => it.Id == id);
+        }
+
+        // 获取订单表中的最大Id
+        // Get the maximum Id from the Student03 table
+        public static int GetMaxStudentId()
+        {
+            SqlSugarClient db = DbHelper.GetNewDb();
+            return db.Queryable<Student03>().Max(it => it.Id);
+        }
+
+        // 简单排序
+        // Simple sorting
+        public static List<Student03> GetStudentsOrderedByIdDesc()
+        {
+            SqlSugarClient db = DbHelper.GetNewDb();
+            return db.Queryable<Student03>().OrderBy(sc => sc.Id, OrderByType.Desc).ToList();
+        }
+
+        // 查询一列
+        // Query a single column
+        public static List<string> GetStudentNames()
+        {
+            SqlSugarClient db = DbHelper.GetNewDb();
+            return db.Queryable<Student03>().Select(it => it.Name).ToList();
+        }
+
+
+
+        public class Student03
+        {
+            [SugarColumn(IsPrimaryKey =true,IsIdentity =true)]
+            public int Id { get; set; }
+            public string Name { get; set; }
+        }
+         
+    }
+}

Src/Asp.Net/SqlServerTest/Program.cs

@@ -10,6 +10,7 @@ namespace OrmTest
         { 
             _1_CodeFirst.Init();
             _2_DbFirst.Init();
+            _3_EasyQuery.Init();
 
             Console.ReadKey();
         }

Src/Asp.Net/SqlServerTest/SqlServerTest.csproj

@@ -67,6 +67,7 @@
     <Compile Include="1_CodeFirst.cs" />
     <Compile Include="2_DbFirst.cs" />
     <Compile Include="UnitTest\Description.cs" />
+    <Compile Include="3_EasyQuery.cs" />
     <Compile Include="UserTestCases\Cases\OldDemo\Demo2_Updateable.cs" />
     <Compile Include="UserTestCases\Cases\OldDemo\Demo3_Insertable.cs" />
     <Compile Include="UserTestCases\Cases\OldDemo\Demo4_Deleteable.cs" />