MACROMEDIA ColdFusion MX, Develop Manual, Page: 811 / 860

Creating a query object from a text file 811
Creating a query object from a text file
You can create a query object from a delimited text file by using the
cfhttp
tag and specifying
method="Get"
and the
name
attribute. This is a powerful method for processing and handling
text files. After you create the query object, you can easily reference columns in the query and
perform other ColdFusion operations on the data.
ColdFusion processes text files in the following manner:
•
You can specify a field delimiter with the
delimiter
attribute. The default is a comma.
•
If data in a field might include the delimiter character, you must surround the entire field with
the text qualifier character, which you can specify with the
textqualifier
attribute. The
default text qualifier is the double quotation mark (").
•
The
textqualifier
="" specifies that there is no text qualifier
.
If you use
textqualifier
="""" (four " marks in a row), it explicitly specifies the double quotation mark
as the text qualifier
.
•
If there is a text qualifier, you must surround all field values with the text qualifier character.
•
To include the text qualifier character in a field, use a double character. For example, if the text
qualifier is ", use "" to include a quotation mark in the field.
•
The first row of text is always interpreted as column headings, so that row is skipped. You can
override the file’s column heading names by specifying a different set of names in the
columns
attribute. You must specify a name for each column. You then use these new names in your
CFML code. However, ColdFusion never treats the first row of the file as data.
•
When duplicate column heading names are encountered, ColdFusion adds an underscore
character to the duplicate column name to make it unique. For example, if two CustomerID
columns are found, the second is renamed "CustomerID_".
To create a query from a text file:
1
Create a text file with the following content:
OrderID,OrderNum,OrderDate,ShipDate,ShipName,ShipAddress
001,001,01/01/01,01/11/01,Mr. Shipper,123 Main Street
002,002,01/01/01,01/28/01,Shipper Skipper,128 Maine Street
2
Save the file as text.txt in the myapps directory under your web_root .
3
Create a ColdFusion page with the following content:
<cfhttp method="Get"
url="http://127.0.0.1/myapps/text.txt"
name="juneorders"
textqualifier="">
<cfoutput query="juneorders">
OrderID: #OrderID#<br>
Order Number: #OrderNum#<br>
Order Date: #OrderDate#<br>
</cfoutput>
<!--- Now substitute different column names --->
<!--- by using the columns attribute --->
<hr>
Now using replacement column names<br>
<cfhttp method="Get"
url="http://127.0.0.1/myapps/text.txt"
name="juneorders"