Sqlite 参数化 模糊查询 解决方案

转自：https://codedefault.com/2018/does-dapper-support-the-like-operator-in-csharp-application

问题描述

如题，在.NET/C#的程序开发中，使用Dapper查询数据时，如何实现类似SQL查询语句中的like操作，如：

var data = conn.Query(@"
    select top 25 Term as Label, Type, ID from SearchTerms WHERE Term like '%@T%'", new { T = (string)term }); 

以上的语句执行后的结果是错误的，在Dapper中，类似SQL语句中的like应该如何处理呢？

方案一

term = "whateverterm"; var encodeForLike = term => term.Replace("[", "[[]").Replace("%", "[%]"); string term = "%" + encodeForLike(term) + "%"; var data = conn.Query(@" select top 25 Term as Label, Type, ID from SearchTerms WHERE Term like @term", new { term }); 

方案二

string query = "SELECT * from country WHERE Name LIKE CONCAT('%',@name,'%');" var results = connection.query<country>(query, new {name}); 

方案三

db.Query<Remitente>("SELECT * FROM Remitentes WHERE Nombre LIKE @n", new { n = "%" + nombre + "%" }) .ToList();