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<p align="center">
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<span>English</span> |
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<a href="https://www.donet5.com/Home/Doc">中文</a>
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</p>
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## SqlSugar
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SqlSugar ORM is a library providing Object/Relational Mapping (ORM) support to applications, libraries, and frameworks.
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Using SqlSugar is very simple , And it's powerful.
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- Support Support CodeFirst data migration.
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- Support Join query 、 Union all 、 Subquery
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- Support Configure the query
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- Support DbFirst import entity class from database, or use Generation Tool.
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- Support one-to-many and many-to-many navigation properties
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- Support MySql、SqlServer、Sqlite、Oracle 、 postgresql 、达梦、人大金仓 、神通数据库
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## Join query
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Super simple query syntax
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```cs
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var query5 = db.Queryable<Order>()
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.LeftJoin<Custom> ((o, cus) => o.CustomId == cus.Id)
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.LeftJoin<OrderItem> ((o, cus, oritem ) => o.Id == oritem.OrderId)
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.LeftJoin<OrderItem> ((o, cus, oritem , oritem2) => o.Id == oritem2.OrderId)
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.Where(o => o.Id == 1)
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.Select((o, cus) => new ViewOrder { Id = o.Id, CustomName = cus.Name })
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.ToList();
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```
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```sql
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SELECT
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[o].[Id] AS [Id],
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[cus].[Name] AS [CustomName]
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FROM
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[Order] o
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Left JOIN [Custom] cus ON ([o].[CustomId] = [cus].[Id])
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Left JOIN [OrderDetail] oritem ON ([o].[Id] = [oritem].[OrderId])
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Left JOIN [OrderDetail] oritem2 ON ([o].[Id] = [oritem2].[OrderId])
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WHERE
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([o].[Id] = @Id0)
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```
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