如何让 LIKE 子句在 ADO.NET 和 SQL Server 中工作

how to get LIKE clause to work in ADO.NET and SQL Server(如何让 LIKE 子句在 ADO.NET 和 SQL Server 中工作)
本文介绍了如何让 LIKE 子句在 ADO.NET 和 SQL Server 中工作的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我在 ASP.NET 中做一个非常简单的查询,但是在我插入 LIKE 子句后它停止工作.

I am doing a really simple query in ASP.NET, but after I inserted the LIKE clause it stops working.

例子:

String sql = " SELECT * 
                 FROM Products 
                WHERE ID = @MYID 
                  AND Name LIKE '%@MYNAME%' ";
SqlCommand command = new SqlCommand(sql, cn);


command.Parameters.AddWithValue("@MYID", MYID.Text);

command.Parameters.AddWithValue("@MYNAME", MYNAME.Text);

如果我删除了 LIKE,它会起作用.因此我认为它与 '' 引号有关?

If I removed the LIKE it works. Hence I am thinking its to do with the '' quotes?

推荐答案

sql语句应该是这样的:

The sql statement should look like this:

String sql = " SELECT * FROM Products WHERE ID = @MYID AND Name LIKE '%' + @MYNAME + '%'"; 

我不确定我是否完全理解了您的评论,但您似乎想在查询中使用文本框中的值 - 也许这就是您想要做的:

I am not sure I understood your comment completely, but it seems you want to use the value from a text box in your query - maybe this is what you are trying to do:

String sql = " SELECT * FROM Products WHERE ID = @MYID AND Name LIKE '%' + text_box.Text + '%'";

"text_box" 将是您的 textBox 控件的实际 ID.

"text_box" would be the actual id of your textBox control.

这篇关于如何让 LIKE 子句在 ADO.NET 和 SQL Server 中工作的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持编程学习网!

本站部分内容来源互联网,如果有图片或者内容侵犯您的权益请联系我们删除!

相关文档推荐

DispatcherQueue null when trying to update Ui property in ViewModel(尝试更新ViewModel中的Ui属性时DispatcherQueue为空)
Drawing over all windows on multiple monitors(在多个监视器上绘制所有窗口)
Programmatically show the desktop(以编程方式显示桌面)
c# Generic Setlt;Tgt; implementation to access objects by type(按类型访问对象的C#泛型集实现)
InvalidOperationException When using Context Injection in ASP.Net Core(在ASP.NET核心中使用上下文注入时发生InvalidOperationException)
LINQ many-to-many relationship, how to write a correct WHERE clause?(LINQ多对多关系,如何写一个正确的WHERE子句?)