作者 Mr-zhong
代码改变世界….
Fast Framework 基于NET6.0 封装的轻量级 ORM 框架 支持多种数据库 SqlServer Oracle MySql PostgreSql Sqlite
优点: 体积小、可动态切换不同实现类库、原生支持微软特性、流畅API、使用简单、性能高、模型数据绑定采用 委托、强大的表达式解析、支持多种子查询可实现较为复杂查询、源代码可读性强。
缺点:目前仅支持Db Frist Code Frist 后续迭代。
开源地址:https://github.com/China-Mr-zhong/Fast-Framework (唯一)
更多示例:https://www.cnblogs.com/China-Mr-zhong/p/17514567.html
导航查询
示例代码
/// <summary>
/// 类别
/// </summary>
public class Category
{
/// <summary>
/// 类别ID
/// </summary>
[Key]
public int CategoryId { get; set; } /// <summary>
/// 类别名称
/// </summary>
public string CategoryName { get; set; } /// &lt;summary&gt;
/// 产品 Navigate MainName和ChildName 可不显示指定,会自动查找主键匹配或ID为结尾的属性
/// &lt;/summary&gt;
[Navigate(MainName = nameof(CategoryId), ChildName = nameof(Product.CategoryId))]
public IEnumerable&lt;Product&gt; Products { get; set; }
}
var data = db.Query&lt;Category&gt;()
.Include(i =&gt; i.Products)
.ToList();</code></pre></li></code></pre><li><p>执行后Sql</p>
SELECT Include_A.`CategoryId`,Include_A.`CategoryName`,Include_B.`ProductId`,Include_B.`ProductCode`,Include_B.`ProductName`,Include_B.`DeleteMark`,Include_B.`CreateTime`,Include_B.`ModifyTime`,Include_B.`Custom1`,Include_B.`Custom2`,Include_B.`Custom3`,Include_B.`Custom4`,Include_B.`Custom5`,Include_B.`Custom6`,Include_B.`Custom7`,Include_B.`Custom8`,Include_B.`Custom9`,Include_B.`Custom10`,Include_B.`Custom11`,Include_B.`Custom12` FROM `Category` `Include_A`
INNER JOIN `Product` `Include_B` ON `Include_A`.`CategoryId` = `Include_B`.`CategoryId`
Join子查询
示例代码
var subQuery1 = db.Query<Product>().Select(s => new
{
s.ProductId,
s.CategoryId,
s.ProductCode,
s.ProductName,
s.DeleteMark
});
var data = db.Query<Category>().InnerJoin(subQuery1, (a, b) => a.CategoryId == b.CategoryId).ToList();
执行后Sql
SELECT p1.`CategoryId`,p1.`CategoryName`,p2.`ProductId`,p2.`ProductCode`,p2.`ProductName`,p2.`DeleteMark` FROM `Category` `p1`
INNER JOIN ( SELECT `ProductId` AS `ProductId`,`CategoryId` AS `CategoryId`,`ProductCode` AS `ProductCode`,`ProductName` AS `ProductName`,`DeleteMark` AS `DeleteMark` FROM `Product` ) `p2` ON ( `p1`.`CategoryId` = `p2`.`CategoryId` )
From子查询
示例代码
var subQuery2 = db.Query<Product>().Select(s=>new
{
s.ProductId,
s.CategoryId,
s.ProductCode,
s.ProductName,
s.DeleteMark
});
var data = db.Query(subQuery2).ToList();
执行后Sql
SELECT * FROM ( SELECT `ProductId` AS `ProductId`,`CategoryId` AS `CategoryId`,`ProductCode` AS `ProductCode`,`ProductName` AS `ProductName`,`DeleteMark` AS `DeleteMark` FROM `Product` ) x
Select子查询
示例代码
var data = db.Query<Product>().Select(s => new
{
CategoryName = db.Query<Category>().Where(w => w.CategoryId == 1).Select(s => s.CategoryName).First()
}).First();
执行后Sql
SELECT ( SELECT `p2`.`CategoryName` FROM `Category` `p2`
WHERE ( `p2`.`CategoryId` = 1 ) Limit 1 ) AS `CategoryName` FROM `Product` `p1` Limit 1
Select嵌套查询
示例代码
var data1 = db.Query<Product>().Select(s => new
{
NestedQuery = db.Query<Category>().Where(w => w.CategoryId == s.CategoryId).ToList()
}).First(); var data2 = db.Query<Product>().Where(w => w.ProductId == 1).Select(s => new
{
NestedQuery = db.Query<Category>().Where(w => w.CategoryId == s.CategoryId).ToList()
}).First();</code></pre></li>
执行后Sql
//内部机制主查询有结果才执行嵌套查询,懒加载实现
SELECT 0 AS `fast_args_index_0` FROM `Product` `p1` Limit 1
--------------------------------------------------------------------------
SELECT p2.`CategoryId`,p2.`CategoryName`,p1.`ProductId`,p1.`ProductCode`,p1.`ProductName`,p1.`DeleteMark`,p1.`CreateTime`,p1.`ModifyTime`,p1.`Custom1`,p1.`Custom2`,p1.`Custom3`,p1.`Custom4`,p1.`Custom5`,p1.`Custom6`,p1.`Custom7`,p1.`Custom8`,p1.`Custom9`,p1.`Custom10`,p1.`Custom11`,p1.`Custom12` FROM `Category` `p2`
RIGHT JOIN `Product` `p1` ON ( `p2`.`CategoryId` = `p1`.`CategoryId` )
SELECT 0 AS `fast_args_index_0` FROM `Product` `p1`
WHERE ( `p1`.`ProductId` = 1 ) Limit 1
Where子查询
示例代码
var data = db.Query<Category>().Where(w => w.CategoryId == 1 && db.Query<Product>().Where(w => w.CategoryId == 1).Select(s => 1).Any()).First();//Any支持取反
执行后Sql
SELECT p1.`CategoryId`,p1.`CategoryName` FROM `Category` `p1`
WHERE ( ( `p1`.`CategoryId` = 1 ) AND EXISTS ( SELECT 1 FROM `Product` `p2`
WHERE ( `p2`.`CategoryId` = 1 ) ) ) Limit 1
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