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Database
If you want to change the value of a key by reading from a database, then set this option.
Then choose from the list of database connections (you set these in Tools menu →
Database setup) . Every database connection returns a resultset according to its SQL
query. However, you can filter this resultset further by entering the appropriate criteria in
the filter~sort field. The filter parameter sets the condition the elements in the resultset
must meet (like the way WHERE works in an SQL query), the sort parameter sets the
way these elements are sorted (like ORDER BY in an SQL query. The filter and sort
parameters must be separated by a '~'. If there are more than one row in the resultset
that meets your filter and sort criteria, you can set the index number of the first row and
also the number of maximum rows to read. If you display a long list in separate pages,
this is the way to do it.
You can even set up the way the data read from the database is returned. E.g. If you
need filenames as flags like c:\flags\bitmaps\HUN.tga but the value you get from the
database is HUN, you can add the 'fixed' part of the filename in the format box like this:
c:\flags\bitmaps\<4>.tga (in this example, the 4
th
column of the data table contains the
value we need, in this case HUN). Another good example would be temperature values
for a weather forecast. The data read from the database are only numbers, but you can
add °C as a fixed element like this:
<1>°C
You can also change any of the criteria to filter and sort the result set in the playout application. In
case of complicated filter or sort parameters, this can be quite complicated. To make it as simple
as possible, you can tag the part of the filter/sort string you want to change by putting these
inside { }.
This way, the only thing you need to input in the playout application is the number you want to
replace this number (13). You do not need to enter the whole filter/sort string which maybe more
than an operator could handle.
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