DataStax Cassandra C# 驱动程序：WHERE IN (?) query with collection parameter

Question

我有以下 C# 代码：

IMapper mapper = new Mapper(session);

//...

var names = new [] {"n1", "n2", "n3"};
//Generation of question marks   
var inStr = string.Join(",", names.Select(n=>"?"));
var users = mapper.Fetch<User>($"SELECT * FROM users WHERE name IN ({inStr})", names);

这种方法行之有效。但也许有人知道更优雅的解决方案？

Answer 1

要在单个参数中提供值的动态列表，请在查询中使用 IN 运算符后跟不带括号的问号占位符。

例如：

var names = new [] {"n1", "n2", "n3"};
var users = mapper.Fetch<User>("SELECT * FROM users WHERE name IN ?", names);

DataStax Cassandra C# 驱动程序：WHERE IN (?) query with collection parameter

DataStax Cassandra C# driver: WHERE IN (?) query with collection parameter

c#

cql

cassandra

datastax