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<title>Data Migration</title>
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<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">Data Migration</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="sync.html">Prev</a> </td>
<th width="60%" align="center">Chapter 4. Administrating Berkeley DB SQL Databases</th>
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<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="datamigration"></a>Data Migration</h2>
</div>
</div>
</div>
<div class="toc">
<dl>
<dt>
<span class="sect2">
<a href="datamigration.html#shellmigrate">Migration Using the Shells</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="datamigration.html#migratedataschema">Supported Data and Schema</a>
</span>
</dt>
</dl>
</div>
<p>
If you have a database created by SQLite, you can migrate
it to a Berkeley DB database for use with the BDB SQL interface. For
production applications, you should do this only when your
application is shutdown.
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="shellmigrate"></a>Migration Using the Shells</h3>
</div>
</div>
</div>
<p>
To migrate your data from SQLite to a Berkeley DB database:
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
Make sure your application is shutdown.
</p>
</li>
<li>
<p>
Open the SQLite database within the
<span class="command"><strong>sqlite3</strong></span> shell.
</p>
</li>
<li>
<p>
Execute the <code class="literal">.output</code> command to
specify the location where you want to dump data.
</p>
</li>
<li>
<p>
Dump the database using the SQLite
<code class="literal">.dump</code> command.
</p>
</li>
<li>
<p>
Close the <span class="command"><strong>sqlite3</strong></span> shell and open
the Berkeley DB <a href="../api_reference/C/dbsql.html" class="olink">dbsql</a> shell. Note that if you build the
BDB SQL interface with the compatibility option, you can
alternatively use Berkeley DB's <a href="../api_reference/C/sqlite3.html" class="olink">sqlite3</a> utility.
</p>
</li>
<li>
<p>
Load the dumped data using the
<code class="literal">.read</code> command.
</p>
</li>
</ol>
</div>
<p>
Note that you can migrate in the reverse direction as well.
Dump the Berkeley DB database by calling <code class="literal">.dump</code>
from within the <a href="../api_reference/C/dbsql.html" class="olink">dbsql</a> shell, and load it into SQLite by calling
<code class="literal">.read</code> from within SQLite's
<span class="command"><strong>sqlite3</strong></span> shell.
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="migratedataschema"></a>Supported Data and Schema</h3>
</div>
</div>
</div>
<p>
You can migrate data between SQLite and Berkeley DB that uses the UTF-8
character encoding.
</p>
<p>
The following data types can be migrated between
SQLite and Berkeley DB:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
CHAR, TEXT , VARCHAR, NVARCHAR, STRING
</p>
</li>
<li>
<p>
REAL, DOUBLE, FLOAT
</p>
</li>
<li>
<p>
INTEGER, BOOLEAN, BIG INTEGER, NUMBER
</p>
</li>
<li>
<p>
NUMERIC
</p>
</li>
<li>
<p>
BLOB, CLOB
</p>
</li>
<li>
<p>
NULL, NOT NULL
</p>
</li>
<li>
<p>
COLLATE BINARY, COLLATE RTRIM, COLLATE NOCASE
</p>
</li>
<li>
<p>
DATETIME, CURRENT_TIME, CURRENT_DATE,
CURRENT_TIMESTAMP
</p>
</li>
</ul>
</div>
<p>
The following schema can be migrated between SQLite
and Berkeley DB:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
PRAGMA writable_schema=ON/OFF
</p>
</li>
<li>
<p>
PRAGMA foreign_keys=ON/OFF
</p>
</li>
<li>
<p>
PRAGMA cache_size
</p>
</li>
<li>
<p>
CREATE TABLE
</p>
<div class="itemizedlist">
<ul type="circle">
<li>
<p>
PRIMARY KEY
</p>
</li>
<li>
<p>
UNIQUE
</p>
</li>
<li>
<p>
CONFLICT IGNORE, FAIL, REPLACE, ABORT,
ROOLBACK
</p>
</li>
<li>
<p>
REFERENCE ON ... CASECADE, ON ... NO
ACTION, DEFERRABLE INITIALLY DEFERRED,
and so forth.
</p>
</li>
<li>
<p>
AUTOINCREMENT
</p>
</li>
<li>
<p>
Static DEFAULT value, dynamic DEFAULT
value
</p>
</li>
<li>
<p>
Functions such as datetime, typeof, and
so forth.
</p>
</li>
<li>
<p>
ASC, DESC
</p>
</li>
<li>
<p>
HIDDEN
</p>
</li>
<li>
<p>
CHECK
</p>
</li>
</ul>
</div>
</li>
<li>
<p>
CREATE INDEX, UNIQUE INDEX
</p>
</li>
<li>
<p>
CREATE VIEW
</p>
<div class="itemizedlist">
<ul type="circle">
<li>
<p>
SELECT statement, ANALYZE
</p>
</li>
<li>
<p>
JOIN
</p>
</li>
<li>
<p>
UNION
</p>
</li>
</ul>
</div>
</li>
<li>
<p>
CREATE TRIGGER AFTER/BEFORE BEGIN
</p>
</li>
<li>
<p>
CREATE VIRTUAL TABLE USING
</p>
</li>
<li>
<p>
INSERT
</p>
</li>
</ul>
</div>
</div>
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<a accesskey="u" href="admin.html">Up</a>
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<td width="40%" align="left" valign="top">Syncing with Oracle Databases </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
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