FreeSql (XXIII) packet, the polymerization FreeSql (XXIII) packet, the polymerization

FreeSql (XXIII) packet, the polymerization

IFreeSql fsql =2904628156 new FreeSql.FreeSqlBuilder()
    .UseConnectionString(FreeSql.DataType.MySql, "Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;Initial Catalog=cccddd;Charset=utf8;SslMode=none;Max pool size=10")
    .Build();

[Table(Name = "tb_topic")]
class Topic { [Column(IsIdentity = true, IsPrimary = true)] public int Id { get; set; } public int Clicks { get; set; } public int TestTypeInfoGuid { get; set; } public string Title { get; set; } public DateTime CreateTime { get; set; } } ISelect<Topic> select => fsql.Select<Topic>();

Packet aggregation

var groupby = fsql.Select<Topic>()
    .GroupBy(a => new { tt2 = a.Title.Substring(0, 2), mod4 = a.Id % 4 }) .Having(a => a.Count() > 0 && a.Avg(a.Key.mod4) > 0 && a.Max(a.Key.mod4) > 0) .Having(a => a.Count() < 300 || a.Avg(a.Key.mod4) < 100) .OrderBy(a => a.Key.tt2) .OrderByDescending(a => a.Count()) .ToList(a => new { a.Key.tt2, cou1 = a.Count(), arg1 = a.Avg(a.Key.mod4) }); //SELECT substr(a.`Title`, 1, 2) as1, count(1) as2, avg((a.`Id` % 4)) as3 //FROM `xxx` a //GROUP BY substr(a.`Title`, 1, 2), (a.`Id` % 4) //HAVING (count(1) > 0 AND avg((a.`Id` % 4)) > 0 AND max((a.`Id` % 4)) > 0) AND (count(1) < 300 OR avg((a.`Id` % 4)) < 100) //ORDER BY substr(a.`Title`, 1, 2), count(1) DESC

API

method	return value	parameter	description
ToSql	string		Returns the SQL statement to be executed
ToList<T>	List<T>	Lambda	Execute SQL query and returns the specified record fields, Count returned when no records exist to list 0
ToList<T>	List<T>	string field	Executing the SQL query, returns the specified field recording field, and tuple or base type (int, string, long) receiving, recording absence Count returned list 0
Sum	T	Lambda	Specify a column summation
me	T	Lambda	Specify a column for the minimum
Max	T	Lambda	Specify a column selecting the maximum value
Avg	T	Lambda	Specify a column averaging
[Packet]
GroupBy	<this>	Lambda	Grouped by columns selected, GroupBy (a => a.Name)
GroupBy	<this>	string, parms	Sql original raw packet syntax, GroupBy ( "concat (name,? Cc)", new {cc = 1})
Having	<this>	string, parms	Sql syntax polymerization conditions original green filter, Having ( "count (name) =? Cc", new {cc = 1})
【member】
Key			Returns the object selected GroupBy
Value			Back to the main table or From <T2, T3 ....> field selector

Series navigation

• (A) entry

• (B) automatically migrate entity

• (C) the entity properties

• (D) the entity properties Fluent Api

• (E) inserting data

• (Vi) bulk insert data

• (Vii) ignore column when inserting data

• (Viii) the specified column when inserting data

• (Ix) delete data

• (J) the update data

• (K) Where the update data

• When the specified column (xii) update data

• Ignored when the column (13) to update the data

• (Xiv) batch update data

• (Xv) query data

• (Xvi) paging query

• (17) linked table query

• (Xviii) Navigation Properties

• (Xix) multi-table query

• (Xx) multi-table queries WhereCascade

• (Xxi) query returns data

• (Xxii) Dto mapping query

• (Xxiii) a packet, the polymerization

• (24) Linq To Sql syntax description

• (Xxv) delay loading

• (26) Eager Load Include, IncludeMany, Dto, ToList

• (Xxvii) that has been written SQL statement, and the second entity class mapping query

• (28) Transaction

• (Twenty-nine) Lambda Expressions

• (Thirty) separate read and write

• (31) sub-district table

• (Thirty-two) Aop

• (Thirty-three) CodeFirst type mapping

• (Thirty-four) CodeFirst migration instructions

• (Thirty-five) CodeFirst custom properties

• 

IFreeSql fsql =2904628156 new FreeSql.FreeSqlBuilder()
    .UseConnectionString(FreeSql.DataType.MySql, "Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;Initial Catalog=cccddd;Charset=utf8;SslMode=none;Max pool size=10")
    .Build();

[Table(Name = "tb_topic")]
class Topic { [Column(IsIdentity = true, IsPrimary = true)] public int Id { get; set; } public int Clicks { get; set; } public int TestTypeInfoGuid { get; set; } public string Title { get; set; } public DateTime CreateTime { get; set; } } ISelect<Topic> select => fsql.Select<Topic>();

Packet aggregation

var groupby = fsql.Select<Topic>()
    .GroupBy(a => new { tt2 = a.Title.Substring(0, 2), mod4 = a.Id % 4 }) .Having(a => a.Count() > 0 && a.Avg(a.Key.mod4) > 0 && a.Max(a.Key.mod4) > 0) .Having(a => a.Count() < 300 || a.Avg(a.Key.mod4) < 100) .OrderBy(a => a.Key.tt2) .OrderByDescending(a => a.Count()) .ToList(a => new { a.Key.tt2, cou1 = a.Count(), arg1 = a.Avg(a.Key.mod4) }); //SELECT substr(a.`Title`, 1, 2) as1, count(1) as2, avg((a.`Id` % 4)) as3 //FROM `xxx` a //GROUP BY substr(a.`Title`, 1, 2), (a.`Id` % 4) //HAVING (count(1) > 0 AND avg((a.`Id` % 4)) > 0 AND max((a.`Id` % 4)) > 0) AND (count(1) < 300 OR avg((a.`Id` % 4)) < 100) //ORDER BY substr(a.`Title`, 1, 2), count(1) DESC

API

method	return value	parameter	description
ToSql	string		Returns the SQL statement to be executed
ToList<T>	List<T>	Lambda	Execute SQL query and returns the specified record fields, Count returned when no records exist to list 0
ToList<T>	List<T>	string field	Executing the SQL query, returns the specified field recording field, and tuple or base type (int, string, long) receiving, recording absence Count returned list 0
Sum	T	Lambda	Specify a column summation
me	T	Lambda	Specify a column for the minimum
Max	T	Lambda	Specify a column selecting the maximum value
Avg	T	Lambda	Specify a column averaging
[Packet]
GroupBy	<this>	Lambda	Grouped by columns selected, GroupBy (a => a.Name)
GroupBy	<this>	string, parms	Sql original raw packet syntax, GroupBy ( "concat (name,? Cc)", new {cc = 1})
Having	<this>	string, parms	Sql syntax polymerization conditions original green filter, Having ( "count (name) =? Cc", new {cc = 1})
【member】
Key			Returns the object selected GroupBy
Value			Back to the main table or From <T2, T3 ....> field selector

Series navigation

• (A) entry

• (B) automatically migrate entity

• (C) the entity properties

• (D) the entity properties Fluent Api

• (E) inserting data

• (Vi) bulk insert data

• (Vii) ignore column when inserting data

• (Viii) the specified column when inserting data

• (Ix) delete data

• (J) the update data

• (K) Where the update data

• When the specified column (xii) update data

• Ignored when the column (13) to update the data

• (Xiv) batch update data

• (Xv) query data

• (Xvi) paging query

• （十七）联表查询

• （十八）导航属性

• （十九）多表查询

• （二十）多表查询 WhereCascade

• （二十一）查询返回数据

• （二十二）Dto 映射查询

• （二十三）分组、聚合

• （二十四）Linq To Sql 语法使用介绍

• （二十五）延时加载

• （二十六）贪婪加载 Include、IncludeMany、Dto、ToList

• （二十七）将已写好的 SQL 语句，与实体类映射进行二次查询

• （二十八）事务

• （二十九）Lambda 表达式

• （三十）读写分离

• （三十一）分区分表

• （三十二）Aop

• （三十三）CodeFirst 类型映射

• （三十四）CodeFirst 迁移说明

• （三十五）CodeFirst 自定义特性

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