125 lines
4.6 KiB
HTML
125 lines
4.6 KiB
HTML
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Recover snapshots from a wal file</h2>
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</div>
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<blockquote><pre>
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int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb);
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</pre></blockquote>
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<p>
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If a <a href="../wal.html#walfile">WAL file</a> remains on disk after all database connections close
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(either through the use of the <a href="../c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlpersistwal">SQLITE_FCNTL_PERSIST_WAL</a> <a href="../c3ref/file_control.html">file control</a>
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or because the last process to have the database opened exited without
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calling <a href="../c3ref/close.html">sqlite3_close()</a>) and a new connection is subsequently opened
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on that database and <a href="../wal.html#walfile">WAL file</a>, the <a href="../c3ref/snapshot_open.html">sqlite3_snapshot_open()</a> interface
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will only be able to open the last transaction added to the WAL file
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even though the WAL file contains other valid transactions.</p>
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<p>This function attempts to scan the WAL file associated with database zDb
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of database handle db and make all valid snapshots available to
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sqlite3_snapshot_open(). It is an error if there is already a read
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transaction open on the database, or if the database is not a WAL mode
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database.</p>
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<p>SQLITE_OK is returned if successful, or an SQLite error code otherwise.</p>
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<p>This interface is only available if SQLite is compiled with the
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<a href="../compile.html#enable_snapshot">SQLITE_ENABLE_SNAPSHOT</a> option.
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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