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Note that you can call Close() on a closed connection, and no exception will be thrown. So, your message would have been displayed if the connection had been closed earlier, or even if it had never been opened. See Figure 5-2, where the connection failed but the close message was still displayed. In one typical case, multiple calls to both Open() and Close() make sense. ADO.NET supports disconnected processing of data, even when the connection to the data provider has been closed. The pattern looks like this:

Another useful task that can be accomplished with sed is to remove text from a file In that case, you just add empty replacement text, as seen in the following example: sed "s/something//g" listtxt Of course you d then have to make sure that the result is then written to some temporary file Also very useful is the option to remove from a file any lines that match a certain pattern For example, the following command would remove user sander from the /etc/passwd file: sed "/sander/d" /etc/passwd Notice that no substitution is used in this example; instead, the d (delete) command removes the line You can even make it somewhat more complicated by removing an empty line In this case, you would need to use a regular expression.

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The SQL standard also provides for FULL OUTER JOIN, UNION JOIN, and CROSS JOIN (and even NATURAL JOIN, basically an inner join using equality predicates), but these are much less used and beyond the scope of this book We won t provide examples, but this section contains a brief summary of them A FULL OUTER JOIN is like a combination of both the LEFT and RIGHT OUTER joins All rows from both tables will be retrieved, even if they have no related rows in the other table A UNION JOIN is unlike outer joins in that it doesn t match rows Instead, it creates a table that has all the rows from both tables.

Try conn.Open() ' Open connection ' ' Online processing (e.g., queries) here ' conn.Close() ' Close connection

The next example shows how: sed "/^$/d" /myfile The special construction used here is a regular expression that searches for the beginning of the line, indicated by a ^ which is followed immediately by the end of the line, which is indicated by a $ Because there s nothing between the two of them, this construction helps you to find empty lines..

For two tables, it s equivalent to the following query: select * from table1 union all select * from table2 The tables must have the same number of columns, and the data types of corresponding columns must be compatible (able to hold the same types of data) A CROSS JOIN combines all rows from both tables It doesn t provide for a join specification, since this would be irrelevant It produces a table with all columns from both tables and as many rows as the product of the number of rows in each table The result is also known as a Cartesian product, since that s the mathematical term for associating each element (row) of one set (table) with all elements of another set.

' ' Offline processing here ' conn.Open() ' Reopen connection ' ' Online processing (e.g., INSERT/UPDATE/DELETE) here ' conn.Close() ' Reclose connection Finally ' Close connection conn.Close() End Try

This is because, if an illegal packet should leave your server, that would indicate that some rogue service is active on your server and you would absolutely need to know about it. To make it a little easier to create your own Netfilter rules, Table 5-5 lists some of the port numbers that are commonly configured in a Netfilter firewall. For a complete list of all port numbers and the names of related services, check the contents of the /etc/services file, which lists all known services with their default ports. Table 5-5. Frequently Used Port Numbers

The Finally block still calls Close(), calling it unnecessarily if no exceptions are encountered. However, this isn t a problem or expensive, and it ensures the connection will be closed. Although many programmers hold connections open until program termination, this is usually wasteful in terms of server resources. With connection pooling, opening and closing a connection as needed is actually more efficient than opening it once and for all. That s it! You re finished with the first connection example. However, because you saw a possible error, let s look at typical causes of connection errors.

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