vely:get-app

get-app

Purpose: Obtain data that describes the application.

get-app \
    name | directory | trace-directory | file-directory \
        | db-vendor <database configuration> | upload-size \
        | path | process-data \
    to [ define ] <variable>

Application-related variables can be obtained with get-app statement. The following application variables can be obtained (they are all strings except upload-size):

"name" returns the name of your application, as specified when created (see vf).
"directory" is the directory where your application resides, i.e. the application home directory (see how_vely_works).
"trace-directory" is the directory where your application trace files are written (if enabled, see how_vely_works).
"file-directory" is the directory where Vely file storage system is, i.e. file_storage.
"db-vendor" is the database vendor name of database given by <database configuration> (as used for example in run-query). You can use it to create database specific conditions. The database vendor name can be compared against predefined string constants VV_MARIADB (for MariaDB database), VV_POSTGRES (for Postgres database) and VV_SQLITE (for SQLite database).
"path" is the leading path of the URL request that can be used to build web forms and links leading back to your application. It returns the same value as p-path.
"process-data" obtains the pointer to global_process_data.
"upload-size" is the maximum allowed size of an uploaded file - this is a number.

Note that all the string values above (except "process-data") should be treated as constants - do not change them as that may cause program to malfunction. If you want to alter any of these values, make a copy first (see copy-string).

Examples

Get the name of Vely application:

get-app name to define appname

Get the vendor of database db:

get-app db-vendor db to define dbv
if (!strcmp (dbv, VV_POSTGRES)) {
    // do something Postgres specific
}