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88 строки
4.4 KiB
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88 строки
4.4 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>DbException</TITLE>
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</HEAD>
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<BODY BGCOLOR=white>
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<H1>DbException</H1>
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<HR SIZE=1 NOSHADE>
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<PRE>
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<!-- Manpage converted by man2html 3.0.1 -->
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<B>#include</B> <B><db</B>_<B>cxx.h></B>
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<B>DbException::DbException(int</B> <B>err);</B>
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<B>DbException::DbException(const</B> <B>char</B> <B>*description);</B>
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<B>DbException::DbException(const</B> <B>char</B> <B>*prefix,</B> <B>int</B> <B>err);</B>
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<B>DbException::DbException(const</B> <B>char</B> <B>*prefix1,</B>
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<B>const</B> <B>char</B> <B>*prefix2,</B> <B>int</B> <B>err);</B>
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<B>const</B> <B>int</B>
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<B>DbException::get</B>_<B>errno();</B>
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<B>virtual</B> <B>const</B> <B>char</B> <B>*</B>
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<B>DbException::what()</B> <B>const;</B>
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The DB library is a family of classes that provides a
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modular programming interface to transactions and record-
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oriented file access. The library includes support for
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transactions, locking, logging and file page caching, as
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well as various indexed access methods. Many of the
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classes (e.g., the file page caching class) are useful
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independent of the other DB classes, although some classes
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are explicitly based on other classes (e.g., transactions
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and logging). For a general description of the DB
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package, see <B><A HREF="db_intro.html">db_intro(3)</A></B>.
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This manual page describes the DbException class and how
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it is used by the various Db* classes.
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Most methods in the Db classes return an int but also
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throw an exception. This allows for two different error
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behaviors, that are known as error models. By default,
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the error model is configured to throw an exception
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whenever a serious error occurs. This generally allows
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for cleaner logic for transaction processing, as a try
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block can surround a single transaction. Alternatively,
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the error model can be set to not throw exceptions, and
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instead request the individual function to return an error
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code. The error model can be changed using the
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DbEnv::set_error_model method, see <B><A HREF="DbEnv.html">DbEnv(3)</A></B>.
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A DbException object contains an informational string and
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an errno. The errno can be obtained using
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DbException::get_errno(). The informational string can be
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obtained using DbException::what().
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We expect in the future that this class will inherit from
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the standard class exception, but certain language
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implementation bugs currently prevent this on some
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platforms.
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Some methods may return non-zero values without issuing an
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exception. This occurs in situations that are not
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normally considered an error, but when some informational
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status is returned. For example, Db::get returns
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DB_KEYNOTFOUND when a requested key does not appear in the
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database.
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<B><A HREF="db_archive.html">db_archive(1)</A></B>, <B><A HREF="db_checkpoint.html">db_checkpoint(1)</A></B>, <B><A HREF="db_deadlock.html">db_deadlock(1)</A></B>, <B><A HREF="db_dump.html">db_dump(1)</A></B>,
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<B><A HREF="db_load.html">db_load(1)</A></B>, <B><A HREF="db_recover.html">db_recover(1)</A></B>, <B><A HREF="db_stat.html">db_stat(1)</A></B>, <B><A HREF="db_intro.html">db_intro(3)</A></B>,
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<B><A HREF="db_internal.html">db_internal(3)</A></B>, <B><A HREF="db_thread.html">db_thread(3)</A></B>, <B><A HREF="Db.html">Db(3)</A></B>, <B><A HREF="Dbc.html">Dbc(3)</A></B>, <B><A HREF="DbEnv.html">DbEnv(3)</A></B>,
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<B><A HREF="DbException.html">DbException(3)</A></B>, <B><A HREF="DbInfo.html">DbInfo(3)</A></B>, <B><A HREF="DbLock.html">DbLock(3)</A></B>, <B><A HREF="DbLockTab.html">DbLockTab(3)</A></B>, <B><A HREF="DbLog.html">DbLog(3)</A></B>,
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<B><A HREF="DbLsn.html">DbLsn(3)</A></B>, <B><A HREF="DbMpool.html">DbMpool(3)</A></B>, <B><A HREF="DbMpoolFile.html">DbMpoolFile(3)</A></B>, <B><A HREF="Dbt.html">Dbt(3)</A></B>, <B><A HREF="DbTxn.html">DbTxn(3)</A></B>,
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<B><A HREF="DbTxnMgr.html">DbTxnMgr(3)</A></B>
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</PRE>
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