msql_db_query() selects a database and executes a query
The name of the mSQL database.
The SQL query.
The mSQL connection.
If not specified, the last link opened by msql_connect()
is assumed. If no such link is found, the function will try to establish a
link as if msql_connect() was called, and use it.
Returns a positive mSQL query identifier to the query result, or FALSE