Adapper 入门

Adapper 入门

特点

• 单实体实现自动装配。连表查询需要自己处理装配，查看查询。
• 原生sql语句。

连接接口：

IDbConnection connection = new SqlConnection("Data Source=.;Initial Catalog=DapperDB;Integrated Security=True;MultipleActiveResultSets=True");

方法：

Execute()

1. //插入 

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2. var result = connection.Execute("Insert into Users values (@UserName, @Email, @Address)",new {UserName = "jack", Email = "380234234@qq.com", Address = "上海"}); 

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3. //批量插入 

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4. var usersList = Enumerable.Range(0, 10).Select(i => new Users() 

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5. { 

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6. Email = i + "qq.com", 

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7. Address = "安徽", 

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8. UserName = i + "jack" 

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9. }); 

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10.  

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11. var result = connection.Execute("Insert into Users values (@UserName, @Email, @Address)", usersList); 

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12. //更新 

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13. var result = connection.Execute("update Users set UserName='Merry' where UserID=@UserID", new {UserID = 1}); 

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14. //删除 

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15. var result = connection.Execute("delete from Users where UserID=@UserID", new {UserID = 1}); 

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Query<T>()

1. //查询 自动装配实体User 

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2. var query = connection.Query<Users>("select * from Users where UserName=@UserName", new {UserName = "jack"}); 

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3. return query; 

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4. //带in的查询 

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5. var sql = "select * from Users where Email in @emails"; 

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6. var info = connection.Query<Users>(sql, new {emails = new string[2] {"5qq.com", "7qq.com"}}); 

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7. //连表查询  

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8. var sql = @"select * from Product as p 

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9. join Users as u 

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10. on p.UserID = u.UserID 

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11. "; 

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12. //下面一句返回 

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13. //System.Collections.Generic.IEnumerable<dynamic> {System.Collections.Generic.List<Dapper.SqlMapper.DapperRow>} 

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14. //var result = connection.Query(sql); 

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15. //返回product对象 

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16. var result = connection.Query<Product, Users, Product>(sql, 

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17. (product, users) => 

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18. { 

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19. product.UserOwner = users; 

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20. return product; 

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21. }, splitOn: "UserName"); 

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22. //spliton 对应要查询连接表要查询的字段 

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MultiStatement()

1. //返回多个结果 

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2. var sql = "select * from Product; select * from Users"; 

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3. var multiReader = connection.QueryMultiple(sql); 

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4. var productList = multiReader.Read<Product>(); 

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5. var userList = multiReader.Read<Users>(); 

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6. multiReader.Dispose(); 

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