Update Sqlite demo

Src/Asp.Net/SqliteTest/2_DbFirst.cs

@@ -0,0 +1,136 @@
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest
+{
+    internal class _2_DbFirst
+    {
+        /// <summary>
+        /// 初始化方法，包含各种DbFirst操作的演示
+        /// Initialization method containing demonstrations of various DbFirst operations
+        /// </summary>
+        public static void Init()
+        {
+            var db = DbHelper.GetNewDb();
+
+            // 生成干净的实体类文件
+            // Generate clean entity class files
+            Demo1(db);
+
+            // 生成带有SqlSugar特性的实体类文件
+            // Generate entity class files with SqlSugar attributes
+            Demo2(db);
+
+            // 支持字符串类型的Nullable特性
+            // Support String Nullable attribute
+            Demo3(db);
+
+            // 格式化类名、属性名和文件名
+            // Format class names, property names, and file names
+            Demo4(db);
+
+            // 条件过滤生成实体类文件
+            // Generate entity class files with condition filtering
+            Demo5(db);
+
+            // 修改模版生成实体类文件（禁用IsCreateAttribute，避免冲突）
+            // Generate entity class files with modified templates (disable IsCreateAttribute to avoid conflicts)
+            Demo6(db);
+        }
+
+        /// <summary>
+        /// 生成干净的实体类文件
+        /// Generate clean entity class files
+        /// </summary>
+        private static void Demo1(SqlSugarClient db)
+        {
+            db.DbFirst.CreateClassFile("c:\\Demo\\1", "Models");
+        }
+
+        /// <summary>
+        /// 生成带有SqlSugar特性的实体类文件
+        /// Generate entity class files with SqlSugar attributes
+        /// </summary>
+        private static void Demo2(SqlSugarClient db)
+        {
+            db.DbFirst.IsCreateAttribute().CreateClassFile("c:\\Demo\\2", "Models");
+        }
+
+        /// <summary>
+        /// 支持字符串类型的Nullable特性
+        /// Support String Nullable attribute
+        /// </summary>
+        private static void Demo3(SqlSugarClient db)
+        {
+            db.DbFirst.IsCreateAttribute().StringNullable().CreateClassFile("c:\\Demo\\3", "Models");
+        }
+
+        /// <summary>
+        /// 格式化类名、属性名和文件名
+        /// Format class names, property names, and file names
+        /// </summary>
+        private static void Demo4(SqlSugarClient db)
+        {
+            db.DbFirst
+                .IsCreateAttribute()
+                .FormatFileName(it => "File_" + it)
+                .FormatClassName(it => "Class_" + it)
+                .FormatPropertyName(it => "Property_" + it)
+                .CreateClassFile("c:\\Demo\\4", "Models");
+        }
+
+        /// <summary>
+        /// 条件过滤生成实体类文件
+        /// Generate entity class files with condition filtering
+        /// </summary>
+        private static void Demo5(SqlSugarClient db)
+        {
+            db.DbFirst.IsCreateAttribute().Where(it => it.ToLower() == "userinfo001").CreateClassFile("c:\\Demo\\5", "Models");
+        }
+
+        /// <summary>
+        /// 修改模版生成实体类文件（禁用IsCreateAttribute，避免冲突）
+        /// Generate entity class files with modified templates (disable IsCreateAttribute to avoid conflicts)
+        /// </summary>
+        private static void Demo6(SqlSugarClient db)
+        {
+            db.DbFirst
+               // 类
+               .SettingClassTemplate(old => { return old;/* 修改old值替换 */ })
+               // 类构造函数
+               .SettingConstructorTemplate(old => { return old;/* 修改old值替换 */ })
+                .SettingNamespaceTemplate(old =>
+                {
+                    return old + "\r\nusing SqlSugar;"; // 追加引用SqlSugar
+                })
+               // 属性备注
+               .SettingPropertyDescriptionTemplate(old => { return old;/* 修改old值替换 */})
+
+               // 属性:新重载 完全自定义用配置
+               .SettingPropertyTemplate((columns, temp, type) =>
+               {
+
+                   var columnattribute = "\r\n           [SugarColumn({0})]";
+                   List<string> attributes = new List<string>();
+                   if (columns.IsPrimarykey)
+                       attributes.Add("IsPrimaryKey=true");
+                   if (columns.IsIdentity)
+                       attributes.Add("IsIdentity=true");
+                   if (attributes.Count == 0)
+                   {
+                       columnattribute = "";
+                   }
+                   return temp.Replace("{PropertyType}", type)
+                                .Replace("{PropertyName}", columns.DbColumnName)
+                                .Replace("{SugarColumn}", string.Format(columnattribute, string.Join(",", attributes)));
+               })
+
+               .CreateClassFile("c:\\Demo\\6");
+        }
+    }
+}
+