如何在C＃命令中使用LIKE运算符？

Question

I need to insert a string into an Sql Command

search.CommandText = "SELECT * FROM Contacts WHERE Name like ' + @person + % + '";

What it the right way of using LIKE in a command?

Answer 1

Should be:

SELECT * FROM Contacts WHERE Name like @person + '%'

@person is a parameter - you don't need single quotes around it. You only need to concatenate it with % , which should have quotes.

Keep in mind:

• You could have kept it "SELECT * FROM Contacts WHERE Name like @person" , and have the parameter value contain % (concatenate in C# is simpler to understand).
• You may also want to escape other wildcard characters already in the string: % , _ , [ and ] .

Answer 2

Use Syntax:

SELECT column_name(s)
FROM table_name
WHERE column_name LIKE pattern

The "%" sign can be used to define wildcards (missing letters in the pattern) both before and after the pattern.

For Example:

• LIKE '%xy' would get you anything ending with 'xy'
• LIKE '%xy%' would get you anything contains the 'xy'
• LIKE 'xy%' would get you anything starting with 'xy'

Answer 3

你是这个意思吗？

searchPerson.CommandText = "SELECT * FROM Contacts WHERE Name LIKE '"+person+"%'";

Answer 4

searchPerson.CommandText =  
   "SELECT * FROM Contacts WHERE Name like @person + '%'"

Answer 5

searchPerson.CommmandText = "SELECT * FROM Contacts WHERE Name like '" + @person + "%'";

Answer 6

select * from Contacts WHERE Name like '%' + '"+@person+"' + '%' 
select * from Contacts WHERE Name like '%' + '"+@person+"' 
select * from Contacts WHERE Name like '"+@person+"' + '%'

Answer 7

这应该工作

"Select *  from customer where FirstName LIKE '"+TextBox1.Text + '%'+ "'   ";

Answer 8

如果Field类型为Nvarchar，请使用以下代码：

   "select * from Contacts where name like N'%"+person+"%'"

Answer 9

"SELECT * FROM table_name like concat(@persons,'%')"

I used it.