Browsing a remote SQL database
People often ask how to browse or edit a SQL database without actually sitting at the SQL machine. Well, you could use Enterprise Manager installed on a local NT Server / SQL Server. Or you could use remote control software like Carbon Copy or Remotely Possible. However, most providers won't let you do those things for obvious security reasons. Well guess what? Do you have a system DSN for your SQL database? Do you have Access 97 or Access 2000 installed? If you answered yes to both of these questions, then you CAN browse your remote SQL database, by following these steps:
- Open Access and create a new, blank database
- On the "Tables" tab, select "New"
- Choose "Link Table" and click OK
- In the "Files of type:" list, change it to "ODBC databases()" - when you do this, a new dialog will pop up
- Choose your DSN from the list on the "Machine Data Source" tab and click OK
- Enter your username and password (or trusted connection if appropriate) and click OK
- Choose the table(s) you want to view/manage, and click OK.
- Add records, view data, change things to your heart's content (but don't go crazy... you're playing with live data there!)
* NOTE: There are some limitations with this method (for example, you will have problems adding or editing tables since Access and SQL Server don't share completely interchangeable datatypes). But it sure beats writing an ASP page from scratch to see your data in a certain way! I've tested this with SQL Server 7.0 but haven't had a chance to test with 6.5. If you found this useful, have any other suggestions, or simply can't get it to work, I want to know about it!
Paging through a recordset
Here's one that is asked all the time: "How do I create a system like AltaVista, where the user can browse through all the records, 10 records per page?" Here's how AltaVista does it:
pgSize = 10
dsnName = "dsnName"
sql = "select field from table"
if request("pg")<>"" then
pg = cint(request("pg"))
pg = 1
set conn = createobject("adodb.connection")
set rs = createobject("adodb.recordset")
if not rs.eof then
rs.AbsolutePage = pg
rs.PageSize = pgSize
x = pgSize
rc = rs.recordCount
if rc > pgSize then
if rc mod pgSize = 0 then
totalpages = rc / pgSize
totalpages = rc \ pgSize + 1
totalpages = 1
text = "<p>Page: "
ahref = "<a href=index.asp?pg="
if pg > 1 then
text = text & ahref & pg-1
text = text & "><</a> "
for i = 1 to totalpages
if i = pg then
text = text & "<b> " & i
text = text & " </b> "
text = text & ahref & i & ">" & i
text = text & "</a> "
if pg < totalpages then
text = text & ahref & pg+1
text = text & ">></a>"
response.write(text & "<p>")
do while not rs.eof and x > 0
response.write(rs("field") & "<p>")
x = x - 1
response.write("Sorry, no matches.")
set rs = nothing
set conn = nothing
NOTE: This script doesn't behave too well if you change the pageSize on the fly.
Maintaining line feeds from memo/text fields
Your users entered separate paragraphs in a textarea. This data was entered into your database. Now when you insert it into HTML, those paragraphs are gone... why? HTML doesn't understand line feeds (that's why you can put lots of space between HTML tags; most whitespace is ignored). So what you have to do is replace the "hidden" linefeeds with HTML linefeeds (<BR>).
set rs = conn.execute(sql)
do while not rs.eof
txt = rs("memoField")
txt = replace(txt,chr(10)," <br>")
The is added to the replace() function so that consecutive linefeeds are not ignored (some browsers, I won't name names, ignore multiple <BR> tags).
Preventing the dreaded apostrophe error
Have you come across SQL syntax errors because your user entered a single quote (')? Do you want to know an easy way to prevent that? Simply replace it with two single quotes before you do your insert/update... the first acts like an escape character, letting SQL know that you do NOT want to use the second single quote as an end of string marker. Here's an example:
strName = request.form("strName")
' FIX NAMES LIKE O'SHEA:
strName = replace(strName,"'","''")
sql = "insert into table(nameField) "
sql = sql & "values('" & strName & "')"
The replace line, for clarity, reads: "replace", open parenthesis, "strName", comma, double quote, single quote, double quote, comma, double quote, single quote, single quote, double quote, close parenthesis.