Dapper官方教程翻译9：Dapper方法之参数类型

2019年02月28日 10:54:45 Day_and_Night_2017 阅读数：84  

1.匿名参数（常用）

 

单个查询：

1.   string sql = "INSERT INTO Customers (CustomerName) Values (@CustomerName);";
2.    
3.   using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
4.   {
5.   var affectedRows = connection.Execute(sql, new {CustomerName = "Mark"});
6.    
7.   Console.WriteLine(affectedRows);
8.    
9.   // Only for see the Insert.
10.   var customer = connection.Query<Customer>("Select * FROM CUSTOMERS WHERE CustomerName = 'Mark'").ToList();
11.    
12.   FiddleHelper.WriteTable(customer);
13.   }

批量查询：

 

1.   string sql = "INSERT INTO Customers (CustomerName) Values (@CustomerName);";
2.    
3.   using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
4.   {
5.   var affectedRows = connection.Execute(sql,
6.   new[]
7.   {
8.   new {CustomerName = "John"},
9.   new {CustomerName = "Andy"},
10.   new {CustomerName = "Allan"}
11.   }
12.    
13.   Console.WriteLine(affectedRows);
14.   )

 

2.动态参数（常用于存储过程）

 

单个操作：

1.   var sql = "EXEC Invoice_Insert";
2.    
3.   using (var connection = My.ConnectionFactory())
4.   {
5.   connection.Open();
6.    
7.   DynamicParameters parameter = new DynamicParameters();
8.    
9.   parameter.Add("@Kind", InvoiceKind.WebInvoice, DbType.Int32, ParameterDirection.Input);
10.   parameter.Add("@Code", "Many_Insert_0", DbType.String, ParameterDirection.Input);
11.   parameter.Add("@RowCount", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);
12.    
13.   connection.Execute(sql,
14.   parameter,
15.   commandType: CommandType.StoredProcedure);
16.    
17.   int rowCount = parameter.Get<int>("@RowCount");
18.   }

批量操作：

 

1.   var sql = "EXEC Invoice_Insert";
2.    
3.   var parameters = new List<DynamicParameters>();
4.    
5.   for (var i = 0; i < 3; i++)
6.   {
7.   var p = new DynamicParameters();
8.   p.Add("@Kind", InvoiceKind.WebInvoice, DbType.Int32, ParameterDirection.Input);
9.   p.Add("@Code", "Many_Insert_" + (i + 1), DbType.String, ParameterDirection.Input);
10.   p.Add("@RowCount", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);
11.    
12.   parameters.Add(p);
13.   }
14.    
15.   using (var connection = My.ConnectionFactory())
16.   {
17.   connection.Open();
18.    
19.   connection.Execute(sql,
20.   parameters,
21.   commandType: CommandType.StoredProcedure
22.   );
23.    
24.   var rowCount = parameters.Sum(x => x.Get<int>("@RowCount"));
25.   }

 

3.列表参数

 

1.   var sql = "SELECT * FROM Invoice WHERE Kind IN @Kind;";
2.    
3.   using (var connection = My.ConnectionFactory())
4.   {
5.   connection.Open();
6.    
7.   var invoices = connection.Query<Invoice>(sql, new {Kind = new[] {InvoiceKind.StoreInvoice, InvoiceKind.WebInvoice}}).ToList();
8.   }

 

4.字符串参数

 

1.   var sql = "SELECT * FROM Invoice WHERE Code = @Code;";
2.    
3.   using (var connection = My.ConnectionFactory())
4.   {
5.   connection.Open();
6.    
7.   var invoices = connection.Query<Invoice>(sql, new {Code = new DbString {Value = "Invoice_1", IsFixedLength = false, Length = 9, IsAnsi = true}}).ToList();
8.    
9.   My.Result.Show(invoices);
10.   }

 

标签：翻译,CustomerName,教程,Add,connection,sql,var,new,Dapper
来源： https://www.cnblogs.com/LiZhongZhongY/p/10991672.html