Data Source Connection

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# Connecting to a data source

The `ddcon` command connects to a data source returning a connection handle, using the form:

       [ch=. ddcon 'dsn=jdata'
    1

We have now connected to a data source, but not yet to a data file. The file we will use is tdata, and the next statement uses `ddcol` to retrieve the column names and attributes for this file:

       $cols=. 'tdata' ddcol ch
    7 13

       3 4 7 {"1 cols
    +------+----+---------+
    |Column|Type|Type_Name|
    +------+----+---------+
    |NAME  |1   |CHAR     |
    +------+----+---------+
    |SEX   |1   |CHAR     |
    +------+----+---------+
    |DEPT  |1   |CHAR     |
    +------+----+---------+
    ...

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