PlanExporter example

This example shows the steps that you must follow in order to use the PlanExporter tool.

Move to the directory where your database was created.
Run the ij tool:
```
java org.apache.derby.tools.ij
```
Create a connection to the database:
```
CONNECT 'jdbc:derby:myDb;create=false';
```
Note: You can use a Derby client/server database as well.

Use XPLAIN styles:

CALL SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(1);
CALL SYSCS_UTIL.SYSCS_SET_XPLAIN_SCHEMA('MY_SCHEMA');
select * from my_table;
CALL SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(0);
CALL SYSCS_UTIL.SYSCS_SET_XPLAIN_SCHEMA('');

Obtain the stmt_id of the query:
```
select stmt_text, stmt_id from MY_SCHEMA.SYSXPLAIN_STATEMENTS;
exit;
```
Now find the stmt_id of the executed query in the displayed results and note it down. It looks something like this:
```
9ac8804c-0129-cc31-ca9a-00000047f1e8
```
Run the PlanExporter tool in the same location:
```
java org.apache.derby.tools.PlanExporter jdbc:derby:myDb MY_SCHEMA 
    9ac8804c-0129-cc31-ca9a-00000047f1e8 -html plain_html;
```
This command uses the default style sheet provided with Derby, and the HTML file will be generated at the same location, since the command does not specify a different path. The name of the HTML file generated is plain_html.html.