问题
Dim strText As String = tbRefine.Text
Dim sql As String = "SELECT user_name,forename,surname,game_cash,reg_group FROM tblGame WHERE user_name LIKE '" + strSearchText + "' & '*'"
Dim dsRefine As New DataSet
GetDataset(sql, "tblGame", dsRefine)
MsgBox(dsRefine.Tables("tblGame").Rows(0).Item(2).ToString)
This is not working, it crashes and says there is nothing in the dataset. I know the dataset function works as its worked successfully before. When i print out the sql statement into microsoft access it works fine. What am i doing wrong
回答1:
Try this:
"SELECT user_name,forename,surname,game_cash,reg_group
FROM tblGame
WHERE user_name LIKE '%" + strSearchText + "%'"
回答2:
Try to use the RTRIM() function in your line:
Dim sql As String = "SELECT user_name,forename,surname,game_cash,reg_group
FROM tblGame
WHERE RTRIM(user_name) LIKE '" + strSearchText + "' & '*'"
回答3:
What about leading or trailing % symbols in your like?
At the moment you will end up with a where clause like:
LIKE 'searchtext''*'
which looks a bit odd (I assume SQL server?).
回答4:
It's wiser to use SQL parameters as your method is open to SQL injection. The link below will help with how to format the SQL statement. I would also suggest doing it via a store procedure, but hats optional...
http://forums.asp.net/t/1256985.aspx
回答5:
I think there's one more thing to be mentioned: the "*" wildcard character works for the "Like" operator in VB/VBA/MS-Access, but not in T-SQL. The correct wildcard character for the "Like" operator in T-SQL is "%". That's why this T-SQL statement:
Select... WHERE ... LIKE 'sText*'
returned no data without any syntax error in MS-SQL(using T-SQL), but works in MS-Access.
来源：https://stackoverflow.com/questions/13583209/sql-like-statement-not-working-in-visual-basic