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9.0

How to handle double quotes in database data queries

Asked by dr_roose in VB Database Programming, SQL Query Syntax

Tags: vb richtextbox mysql

Hi All,
I have several text fields in a database table where it is probably that at some time someone will put double quotes in the text.  Since the data in sql queries is delimited by double quote characters, double quotes in the text data causes the query to fail.  The below code is the sub that generates and runs the query.

Is there any way to get around this short of modifying the text to delete double quotes or make them two double quotes which the query seem to handle?

Thanks
dr_roose
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Private Sub UpdateRecord()
    Dim sql As String = "UPDATE contacts SET "
    sql = sql & "first = """ & TB1.Text & """"
    sql = sql & ", last = """ & TB2.Text & """"
    sql = sql & ", phone = """ & TB3.Text & """"
    sql = sql & ", mobile = """ & TB4.Text & """"
    sql = sql & ", email = """ & TB5.Text & """"
    sql = sql & ", problem = """ & RTB1.Text & """"
    sql = sql & ", notes = """ & RTB2.Text & """"
    sql = sql & " WHERE id = " & TB10.Text
    Dim connection As New MySqlConnection(connStr2)
    Dim cmd As New MySqlCommand(sql, connection)
    connection.Open()
    Try
      cmd.ExecuteNonQuery()
      connection.Close()
      doUpdate = False
      Call LoadGrid()
    Catch
      MsgBox("Cannot update database!  Please remove all double quotes """""""from all text fields.")
    End Try
  End Sub
 
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Zones: VB Database Programming, SQL Query Syntax
Tags: vb richtextbox mysql
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Solution Provided By: angelIII
Participating Experts: 3
Solution Grade: A
 
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