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doc: add go1.9 release notes for database/sql changes

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Change-Id: I9b0f17e123805ad9f526f5ea44b23cf4dbadcdcc
Reviewed-on: https://go-review.googlesource.com/45611
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Daniel Theophanes 2017-06-13 12:35:20 -07:00 committed by Brad Fitzpatrick
parent 4c028e5650
commit d4ab73d1df
1 changed files with 21 additions and 3 deletions
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@ -297,15 +297,33 @@ type T1 = T2
<dl id="database/sql"><dt><a href="/pkg/database/sql/">database/sql</a></dt>
<dd>
<p><!-- CL 35476 -->
TODO: <a href="https://golang.org/cl/35476">https://golang.org/cl/35476</a>: proper prepared statement support in transactions
The package will now use a cached <a href="/pkg/database/sql/#Stmt"><code>Stmt</code></a> if
available in <a href="/pkg/database/sql/#Tx.Stmt"><code>Tx.Stmt</code></a>.
This prevents statements from being re-prepared each time
<a href="/pkg/database/sql/#Tx.Stmt"><code>Tx.Stmt</code></a> is called.
</p>
<p><!-- CL 38533 -->
The package now allows drivers to implement their own argument checkers by implementing
<a href="/pkg/database/sql/driver/#NamedValueChecker"><code>driver.NamedValueChecker</code></a>.
This also allows drivers to support <code>OUTPUT</code> and <code>INOUT</code> parameter types.
<a href="/pkg/database/sql/#Out"><code>Out</code></a> should be used to return output parameters
when supported by the driver.
</p>
<p><!-- CL 39031 -->
TODO: <a href="https://golang.org/cl/39031">https://golang.org/cl/39031</a>: support scanning into user defined string types
<a href="/pkg/database/sql/#Rows.Scan"><code>Rows.Scan</code></a> can now scan user-defined string types.
Previously the package supported scanning into numeric types like <code>type Int int64</code>. It now also supports
scanning into string types like <code>type String string</code>.
</p>
<p><!-- CL 40694 -->
TODO: <a href="https://golang.org/cl/40694">https://golang.org/cl/40694</a>: allow using a single connection from the database
The new <a href="/pkg/database/sql/#DB.Conn"><code>DB.Conn</code></a> method returns the new
<a href="/pkg/database/sql/#Conn"><code>Conn</code></a> type representing an
exclusive connection to the database from the connection pool. All queries run on
a <a href="/pkg/database/sql/#Conn"><code>Conn</code></a> will use the same underlying
connection until <a href="/pkg/database/sql/#Conn.Close"><code>Conn.Close</code></a> is called
to return the connection to the connection pool.
</p>
</dl><!-- database/sql -->