此asp.net代码不起作用

Question

Anyone know why the following is not working?

Dim strPhrase As String = "'%office%'"

objStringBuilder = New StringBuilder()

objSQLConnection = New SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connString"))

objSQLCommand = New SqlCommand("select col1, col2 from table1 where phrase like @phrase", objSQLConnection)

objSQLCommand.Parameters.Add("@phrase", SqlDbType.VarChar, 255).Value = strPhrase

objSQLCommand.Connection.Open()
objSQLDataReader = objSQLCommand.ExecuteReader()

While objSQLDataReader.Read()
objStringBuilder.Append(objSQLDataReader("col1") & " - " & objSQLDataReader("col2"))
End While

objSQLDataReader.Close()
objSQLCommand.Connection.Close()

return objStringBuilder.tostring()

If I remove anything to do with phrase , it starts working again, ie:

objStringBuilder = New StringBuilder()

objSQLConnection = New SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connString"))

objSQLCommand = New SqlCommand("select col1, col2 from table1", objSQLConnection)

objSQLCommand.Connection.Open()
objSQLDataReader = objSQLCommand.ExecuteReader()

While objSQLDataReader.Read()
objStringBuilder.Append(objSQLDataReader("col1") & " - " & objSQLDataReader("col2"))
End While

objSQLDataReader.Close()
objSQLCommand.Connection.Close()

return objStringBuilder.tostring()

I get no errors, it just returns a blank string.

Answer 1

Remove the '' from around your search phrase, the command object deals with all that for you. ie

Dim strPhrase As String = "%office%"

Answer 2

you can make it like this

Dim strPhrase As String = "%office%"

and add bellow line to the end of your connection string

allow user variables=true;

Answer 3

像这样

Dim strPhrase As String = "%office%"