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## 🍬 SqlSugar
SqlSugar ORM is a library providing Object/Relational Mapping (ORM) support to applications, libraries, and frameworks.
Using SqlSugar is very simple , And it's powerful.
- Support SqlServer、MySql and Oracle insert blukcopy
- Support Multi-tenant, multi-library transactions
- Support Support CodeFirst data migration.
- Support Join query 、 Union all 、 Subquery
- Support Configure the query
- Support DbFirst import entity class from database, or use Generation Tool.
- Support one-to-many and many-to-many navigation properties
- Support MySql、SqlServer、Sqlite、Oracle 、 postgresql 、达梦、人大金仓 、神通数据库
## Documentation
## Feature characteristic
### Feature1 : Join query
Super simple query syntax
```cs
var query5 = db.Queryable()
.LeftJoin ((o, cus) => o.CustomId == cus.Id)
.LeftJoin ((o, cus, oritem ) => o.Id == oritem.OrderId)
.LeftJoin ((o, cus, oritem , oritem2) => o.Id == oritem2.OrderId)
.Where(o => o.Id == 1)
.Select((o, cus) => new ViewOrder { Id = o.Id, CustomName = cus.Name })
.ToList();
```
```sql
SELECT
[o].[Id] AS [Id],
[cus].[Name] AS [CustomName]
FROM
[Order] o
Left JOIN [Custom] cus ON ([o].[CustomId] = [cus].[Id])
Left JOIN [OrderDetail] oritem ON ([o].[Id] = [oritem].[OrderId])
Left JOIN [OrderDetail] oritem2 ON ([o].[Id] = [oritem2].[OrderId])
WHERE
([o].[Id] = @Id0)
```
### Feature2 : Page query
```cs
int pageIndex = 1;
int pageSize = 20;
int totalCount=0;
var page = db.Queryable().ToPageList(pageIndex, pageSize, ref totalCount);
```
### Feature3 : Dynamic expression
```cs
var names= new string [] { "a","b"};
Expressionable exp = new Expressionable();
foreach (var item in names)
{
exp.Or(it => it.Name.Contains(item.ToString()));
}
var list= db.Queryable().Where(exp.ToExpression()).ToList();
```
```sql
SELECT [Id],[Name],[Price],[CreateTime],[CustomId]
FROM [Order] WHERE (
([Name] like '%'+ CAST(@MethodConst0 AS NVARCHAR(MAX))+'%') OR
([Name] like '%'+ CAST(@MethodConst1 AS NVARCHAR(MAX))+'%')
)
```
### Feature4 : Multi-tenant transaction
```cs
//Creaate database object
SqlSugarClient db = new SqlSugarClient(new List()
{
new ConnectionConfig(){ ConfigId="0", DbType=DbType.SqlServer, ConnectionString=Config.ConnectionString, IsAutoCloseConnection=true },
new ConnectionConfig(){ ConfigId="1", DbType=DbType.MySql, ConnectionString=Config.ConnectionString4 ,IsAutoCloseConnection=true}
});
var mysqldb = db.GetConnection("1");//mysql db
var sqlServerdb = db.GetConnection("0");// sqlserver db
db.BeginTran();
mysqldb.Insertable(new Order()
{
CreateTime = DateTime.Now,
CustomId = 1,
Name = "a",
Price = 1
}).ExecuteCommand();
mysqldb.Queryable().ToList();
sqlServerdb.Queryable().ToList();
db.CommitTran();
```
### Feature5 : Singleton Pattern
Implement transactions across methods
```CS
public static SqlSugarScope Db = new SqlSugarScope(new ConnectionConfig()
{
DbType = SqlSugar.DbType.SqlServer,
ConnectionString = Config.ConnectionString,
IsAutoCloseConnection = true
},
db=> {
db.Aop.OnLogExecuting = (s, p) =>
{
Console.WriteLine(s);
};
});
using (var tran = Db.UseTran())
{
//业务代码
new Test2().Insert(XX);
new Test1().Insert(XX);
.....出错会自动回滚
....
tran.CommitTran();//这个提交不能漏掉
}
```