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If you are implementing a file storage application such as a document archive or image repository, storing the files in the database is a sensible alternative to keeping them in a folder.
The advantages of the database approach are: To demonstrate Asp Upload's database features, a sample MS Access database, aspupload.mdb, has been included in the installation.
) as a placeholder for the file being saved in the database, for example: This statement inserts the current file into the field img of the table IMAGES, and the string 'name.ext' into the field name.
The DSN parameter in the first argument points to a system DSN creatable via the ODBC control panel.
Here is what odbc_looks like: Note the use of the built-in Replace function which replaces all occurrences of the ' character (single quote) by two single quotes to avoid a run-time error if the description contains single quotes. The second argument is a SELECT statement that must return one record containing a BLOB.
The first argument for this method is a file path, the other two are the same as for the method File. Downloading a file from the database directly to a client browser is possible without using Asp Upload or any other third-party component, it can be achieved with ADO alone. Instead of ODBC, you can use the ADO Recordset object in conjunction with the File. Using the Binary property, a file can be assigned to the recordset much the same way as a regular numeric or string value, for example: This code is more intuitive as it does not require building complex SQL statements. This approach works equally well for inserts and updates.
If the ultimate destination of a file is the database, you may consider using uploads to memory (described in the previous chapter) for better security and performance.
The sample files and ado_demonstrate the combined use of memory uploads and File. This code sample also utilizes one-way hashing to determine whether a newly uploaded file already exists in the database.
To download a file from the database, you need to provide a link on your web page pointing to an ASP script that calls Response. For example, your HTML page contains the following link: , just pure ASP script.
The sample files and filelist_demonstrate this technique.