Mysql Replace function issue - mysql

Question

I want to update my table with replace function, but the result is not my expected result, how can I solve this problem?
Lets say I have a LONGTEXT columns(using_id) with value like this 1,2,3,4,5,6,7,8,9,10,11,
Now I want to remove '1,' so I write in this way:-
Dim query As String = "UPDATE curr_id SET using_id = REPLACE(using_id,'" & $"{g_currTicketID}," & "','')"
But the result become 2,3,4,5,6,7,8,9,10,1 How can I keep my '11,'?
Expected result: 2,3,4,5,6,7,8,9,10,11,
Public Sub TicketStatusUpdate(p_str As String)
'Login => GET NEXT ID > UPDATE USING ID > UPDATE NEXT ID
'Sales => RELEASE > UPDATE USED ID > GET NEXT ID > UPDATE USING ID > UPDATE NEXT ID
Select Case p_str
Case "UPDATE USED ID"
TicketStatusUpdate("RELEASE")
Dim query As String = "UPDATE curr_id SET used_id = CONCAT(used_id, '" & $"{g_currTicketID}," & "')"
Using cmd = New MySqlCommand(query, conn)
cmd.ExecuteNonQuery()
End Using
TicketStatusUpdate("GET NEXT ID")
Case "GET NEXT ID"
Dim query_select = "SELECT * FROM curr_id WHERE DATE(curr_date) = '" & Format(DateTime.Today.Date, "yyyy-MM-dd") & "' "
Dim reader As MySqlDataReader
Dim IsNewDay As Boolean = False
Using cmd = New MySqlCommand(query_select, conn)
reader = cmd.ExecuteReader
reader.Read()
If reader.HasRows Then
g_currTicketID = reader.GetInt32("next_id")
Else
g_currTicketID = 1
IsNewDay = True
End If
reader.Close()
End Using
If IsNewDay Then TicketStatusUpdate("RESET")
TicketStatusUpdate("UPDATE USING ID")
TicketStatusUpdate("UPDATE NEXT ID")
Case "UPDATE USING ID"
Dim query As String = "UPDATE curr_id SET using_id = CONCAT(using_id, '" & $"{g_currTicketID}," & "')"
Using cmd = New MySqlCommand(query, conn)
cmd.ExecuteNonQuery()
End Using
Case "UPDATE NEXT ID"
Dim query1 As String = "SELECT * FROM curr_id"
Dim str_usingID As String = ""
Dim str_usedID As String = ""
Dim reader As MySqlDataReader
Using cmd = New MySqlCommand(query1, conn)
reader = cmd.ExecuteReader
reader.Read()
str_usingID = reader.GetString("using_id").ToString
str_usedID = reader.GetString("used_id").ToString
reader.Close()
End Using
Dim str_allID As String = (str_usingID + str_usedID).TrimEnd(",")
Dim strArray As String() = str_allID.Split(",")
Dim intArray As Integer() = Array.ConvertAll(strArray, Function(s) Int32.Parse(s))
Array.Sort(Of Integer)(intArray)
Dim nextID As Integer = FirstMissing(intArray)
Dim query2 As String = "UPDATE curr_id SET next_id = '" & nextID & "'"
Using cmd = New MySqlCommand(query2, conn)
cmd.ExecuteNonQuery()
End Using
Case "RELEASE"
Dim query As String = "UPDATE curr_id SET using_id = REPLACE(using_id,'" & $"{g_currTicketID}," & "','')"
Using cmd = New MySqlCommand(query, conn)
cmd.ExecuteNonQuery()
End Using
Case "RESET"
Dim query As String = "UPDATE curr_id SET next_id='',used_id='',using_id=''"
Using cmd = New MySqlCommand(query, conn)
cmd.ExecuteNonQuery()
End Using
End Select
End Sub
Private Function FirstMissing(sequence() As Integer) As Integer
Dim seq = sequence
Dim firstMissingNumer = Int32.MinValue
For i = 1 To Math.Min(seq.Last, seq.Count)
If seq(i - 1) <> i Then
firstMissingNumer = i
Exit For
End If
Next
If firstMissingNumer = Int32.MinValue Then
Return seq.Max + 1
Else
Return firstMissingNumer
End If
End Function
When I logout the application it will call TicketStatusUpdate("RELEASE") to remove the g_currTicketID from using_id column.
Examples:
g_currTicketID = 1
using_id = 1,11,21,31,
When TicketStatusUpdate("RELEASE") called it will remove all '1,' from using_id, so the result will become 1,2,3 which is not the result that I want, I only want to remove '1,' and keep '11,21,31,'

Answer 1

Instead of replace just value, you could try to replace both value and boundary character
(in your case, comma ',' is a boundary character).
Example:
With g_currTicketID = 1, using_id = 1,11,21,31, then
replaceValue = CONCAT(',',g_currTicketID,',') = ',1,'
stringToReplace = CONCAT(',',using_id,',') = ',1,11,21,31,'
using_id = TRIM(BOTH ',' FROM REPLACE(stringToReplace, replaceValue, ','))
Your updat statement could be like this
Dim query As String = "UPDATE curr_id SET using_id = TRIM(BOTH ',' FROM REPLACE(CONCAT(',' ,using_id, ','), '," & $"{g_currTicketID}," & "', ','))"