Update README.md

README.md

@@ -338,3 +338,65 @@ catch (Exception)
       return dbResult;
   });
 ```
+
+## 8. DbFirst
+```c
+var db = GetInstance();
+    //Create all class
+    db.DbFirst.CreateClassFile("c:\\Demo\\1");
+
+    //Create student calsss
+    db.DbFirst.Where("Student").CreateClassFile("c:\\Demo\\2");
+    //Where(array)
+
+    //Mapping name
+    db.MappingTables.Add("ClassStudent", "Student");
+    db.MappingColumns.Add("NewId", "Id", "ClassStudent");
+    db.DbFirst.Where("Student").CreateClassFile("c:\\Demo\\3");
+
+    //Remove mapping
+    db.MappingTables.Clear();
+
+    //Create class with default value
+    db.DbFirst.IsCreateDefaultValue().CreateClassFile("c:\\Demo\\4", "Demo.Models");
+
+
+    //Mapping and Attribute
+    db.MappingTables.Add("ClassStudent", "Student");
+    db.MappingColumns.Add("NewId", "Id", "ClassStudent");
+    db.DbFirst.IsCreateAttribute().Where("Student").CreateClassFile("c:\\Demo\\5");
+
+
+    //Remove mapping
+    db.MappingTables.Clear();
+    db.MappingColumns.Clear();
+
+    //Custom format,Change old to new
+    db.DbFirst.
+        SettingClassTemplate(old =>
+        {
+            return old;
+        })
+       .SettingNamespaceTemplate(old =>
+       {
+           return old;
+       })
+       .SettingPropertyDescriptionTemplate(old =>
+       {
+           return @"           /// <summary>
+   /// Desc_New:{PropertyDescription}
+   /// Default_New:{DefaultValue}
+   /// Nullable_New:{IsNullable}
+   /// </summary>";
+       })
+        .SettingPropertyTemplate(old =>
+        {
+            return old;
+        })
+        .SettingConstructorTemplate(old =>
+        {
+            return old;
+        })
+    .CreateClassFile("c:\\Demo\\6");
+}
+```