补充查询

docs/03.NET微服务/02.ORM/03.FreeSql.md

@@ -69,6 +69,119 @@ var user = fsql.Select<User>().Where(u => u.Name == "张三").FirstOrDefault();
 
 
 在这个示例中，我们创建了一个名为 User 的类，表示一个用户对象。然后，我们使用 FreeSql 对象来执行基本查询。我们首先查询了所有的用户，然后查询了名为“张三”的用户。
+
+
+
+#### 查询where条件
+
+```c#
+var blogslist1 = fsql.Select<Blog>()
+                    .Where( b => b.Rating > -3 )
+                    .OrderBy( b => b.Url )
+                    .ToList();
+
+var blogslist2 = fsql.Select<Blog>()
+                   .Where( "Rating>=@min and Rating<=@max",new
+                   {
+                       min=1,
+                       max=10
+                   } )
+                   .OrderBy( b => b.Url )
+                   .ToList();
+```
+
+Where可以写多个,实际是多个and条件
+
+```c#
+var blogslist1 = fsql.Select<Blog>()
+                                .Where( b => b.Rating > -3 )
+                                .Where ( b=>b.BlogId >50 )
+                                .OrderBy( b => b.Url )
+                                .ToList();
+```
+
+
+
+#### 查询WhereIf条件
+
+```c#
+var blogslist3 = fsql.Select<Blog>()
+               .Where( "BlogId>=@min and BlogId<=@max" , new
+               {
+                   min = 1 ,
+                   max = 10
+               } )
+               //当条件成立时,才会过滤数据
+               .WhereIf( 1 == 1, "Rating=@Rating", new
+               {
+                   Rating=0
+               } )
+               .OrderBy( b => b.BlogId )
+               .ToList();
+```
+
+
+
+#### 查询(IN查询)
+
+##### in查询
+
+```c#
+//数字类型
+var list1 = DB.fsql.Select<Blog>()
+                                .Where( a => new[] { 1 , 2 , 3 }.Contains( a.Rating ) )
+                                .ToList();
+
+/*
+对应sql:
+SELECT a.[BlogId], a.[Url], a.[Rating], a.[BlogTypeId], a.[Times]
+FROM[Blog] a
+WHERE( ( ( a.[Rating] ) in (1, 2, 3) ))
+*/
+
+
+
+//字符串类型
+var list2 = DB.fsql.Select<Blog>()
+                                .Where( it => it.BlogId >= 1 )
+                                .Where( a => new[] { "piliang_rul" , "rul3" }.Contains( a.Url ) )
+                                .ToList();
+/*
+对应sql:
+SELECT a.[BlogId], a.[Url], a.[Rating], a.[BlogTypeId], a.[Times]
+FROM[Blog] a
+WHERE( a.[BlogId] >= 1 ) AND( ( ( a.[Url] ) in ( N'piliang_rul' , N'rul3' )))            
+*/
+
+
+
+//使用List 也可以
+List<string> barcodelist = new List<string>() { "piliang_rul" , "rul3" };
+
+var list = fsql.Select<SPIBOARDBINDS>()
+                                 .Where( it => barcodelist.Contains( it.BARCODE ) )
+                                .ToList();
+```
+
+##### in子表查询
+
+```c#
+//in子表查询
+var list3 = DB.fsql.Select<Blog>()
+                           .Where( it => it.BlogId >= 1 )
+                           .Where( a => DB.fsql.Select<BlogType>().As( "b" ).ToList( b => b.BlogTypeId ).Contains( a.BlogTypeId ) )
+                           .ToList();
+
+/*对应sql:
+            SELECT a.[BlogId], a.[Url], a.[Rating], a.[BlogTypeId], a.[Times] 
+            FROM [Blog] a 
+            WHERE (a.[BlogId] >= 1) AND (((a.[BlogTypeId]) in (SELECT b.[BlogTypeId] 
+                FROM [BlogType] b)))
+*/
+```
+
+
+
 ### 插入数据
 
 ```csharp