pg_query() executes the query
on the specified database connection.
If an error occurs, and FALSE is returned, details of the error can
be retrieved using the pg_last_error()
function if the connection is valid.
Although connection can be omitted, it
is not recommended, since it can be the cause of hard to find
bugs in scripts.
This function used to be called pg_exec().
pg_exec() is still available for compatibility
reasons, but users are encouraged to use the newer name.
PostgreSQL database connection resource. When
connection is not present, the default connection
is used. The default connection is the last connection made by
pg_connect() or pg_pconnect().
The SQL statement or statements to be executed. When multiple statements are passed to the function,
they are automatically executed as one transaction, unless there are explicit BEGIN/COMMIT commands
included in the query string. However, using multiple transactions in one function call is not recommended.
A query result resource on success, or FALSE on failure.