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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Building the Android JDBC Driver</title>
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<p>Library Version 12.1.6.1</p>
</div>
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<tr>
<th colspan="3" align="center">Building the Android JDBC
Driver</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="build_android_intro.html">Prev</a> </td>
<th width="60%" align="center">Chapter 4. Building Berkeley DB for
Android</th>
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</tr>
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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="build_android_jdbc"></a>Building the Android JDBC
Driver</h2>
</div>
</div>
</div>
<p>
The JDBC API is an alternative to the drop-in replacement.
It is possible to build Berkeley DB SQL for Android in such a
way that a JDBC API is exposed to Android application
developers. This is done using the Android NDK.
</p>
<p>
This section describes how to build and use the BDB JDBC
driver for Android. Note that the BDB JDBC driver cannot
currently be built on a Windows platform.
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
Download and install the Android SDK. The
installation instructions can be found here:
</p>
<p>
<a class="ulink" href="http://developer.android.com/sdk/installing/index.html" target="_top">http://developer.android.com/sdk/installing/index.html</a>
</p>
</li>
<li>
<p>
Download and install the Android NDK. It can be
found here:
</p>
<p>
<a class="ulink" href="http://developer.android.com/tools/sdk/ndk/index.html" target="_top">http://developer.android.com/tools/sdk/ndk/index.html</a>
</p>
</li>
<li>
<p>
Build the BDB JDBC libraries.
</p>
<div class="orderedlist">
<ol type="a">
<li>
<p>
If you do not already have it, download the
Berkeley DB package from here:
</p>
<p>
<a class="ulink" href="http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html" target="_top">http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html</a>
</p>
<p>
Note that you must be using a 5.3.x or
higher version of the product in order for
these instructions to work. Once you have the
package, unpack it:
</p>
<pre class="programlisting">$ tar zxvf db-x.y.z.tar.gz
$ cd db-x.y.z</pre>
<p>
Where <code class="literal">x.y.z</code> the major,
minor, and point release version of the
Berkeley DB distribution which you are using.
</p>
<p>
Also, note that in the following
instructions, the directory denoted by
<code class="literal">db-x.y.z</code>, above, is
referred to as <code class="literal"><db></code>.
</p>
</li>
<li>
<p>
Build an x86/x64 JDBC package. This is
required because the building process will
generate target files which are required to
build Android NDK. Also, the built JAR file
can be imported by eclipse, which will then
convert it to the Android Dalvik JAR format.
</p>
<p>
To do this, edit
<code class="literal"><db>/lang/sql/jdbc/SQLit/Database.java</code>
and replace all instances of
<code class="literal">System.loadLibrary("sqlite_jni")</code>
with
<code class="literal">System.loadLibrary("oracle-jdbc")</code>.
</p>
<p>
Once you have done this, configure and make
the library. The following example shows the
minimum configuration options that you need to
use in order to configure the Berkeley DB JDBC
driver. For your particular installation,
other configuration options might be
interesting to you. See <a class="xref" href="build_unix_conf.html" title="Configuring Berkeley DB">Configuring Berkeley DB</a> and
<a class="xref" href="build_android_config.html" title="Android Configuration Options">Android Configuration
Options</a> for
more information.
</p>
<pre class="programlisting">cd <db>/build_unix
../dist/configure --enable-jdbc && make</pre>
</li>
</ol>
</div>
</li>
<li>
<p>
Enable encryption if required.
</p>
<p>
By default, encryption is disabled. To enable it,
edit
<code class="literal"><db>/build_android/jdbc/jni/Android.mk</code>
and change <code class="literal">BDB_ENABLE_ENCRYPTION</code>
from <code class="literal">false</code> to
<code class="literal">true</code>.
</p>
<p>
After enabling encryption, use <code class="literal">pragma
key</code> to set the password. You must do
this before performing any database operations. For
example:
</p>
<pre class="programlisting"> # ./dbsql test.db
dbsql> pragma key="xyzzy";
dbsql> create table t1(x);
dbsql> .quit
# ./dbsql test.db
dbsql> pragma key="xyzzy";
dbsql> .tables
t1 </pre>
</li>
<li>
<p>
Build the Android NDK:
</p>
<pre class="programlisting">$ cd <db>/build_android/jdbc/jni
$ <ndk-install-directory>/ndk-build </pre>
<p>
This results in the following required files:
</p>
<table class="simplelist" border="0" summary="Simple list">
<tr>
<td><db>/build_android/jdbc/libs/armeabi/liboracle-jdbc.so</td>
</tr>
<tr>
<td><db>/build_android/jdbc/libs/armeabi/dbsql</td>
</tr>
<tr>
<td><db>/build_unix/jdbc/sqlite.jar</td>
</tr>
</table>
</li>
</ol>
</div>
<p>
Having built the JDBC driver, you can now use it with your
project. You can do this using Eclipse and the ADT plugin,
which you can get from here:
</p>
<p>
<a class="ulink" href="http://developer.android.com/tools/sdk/eclipse-adt.html" target="_top">http://developer.android.com/tools/sdk/eclipse-adt.html</a>
</p>
<p>
To make sure everything is working:
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
Start Eclipse and create an Android project. Use:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<code class="literal">test_jdbc</code> as the Android
project name.
</p>
</li>
<li>
<p>
Create it as an Android 3.2 project.
</p>
</li>
<li>
<p>
For the package name, use
<code class="literal">example.jdbc</code>.
</p>
</li>
</ul>
</div>
</li>
<li>
<p>
This results in an empty code file. Copy and paste
the following example code into that file:
</p>
<pre class="programlisting">package example.testjdbc;
import SQLite.*;
import java.io.*;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import java.sql.*;
public class Test_jdbcActivity extends Activity {
/*
* This is the main entrance/body of our sample program. This
* example illustrates all of the major API usages.
*/
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView tv = new TextView(this);
tv.setText("App Started");
setContentView(tv);
System.out.println("Appstart: ");
String url =
"jdbc:sqlite://data/data/example.testjdbc/example.db";
Connection con;
String dropString = "drop table if exists COFFEES";
String createString;
createString = "create table COFFEES "
+ "(COF_NAME varchar(32), "
+ "SUP_ID int, " + "PRICE float, " + "SALES int, "
+ "TOTAL int)";
String insertString = "drop table COFFEES if exisits";
String query = "select COF_NAME, PRICE from COFFEES";
Statement stmt;
try {
Class.forName("SQLite.JDBCDriver");
} catch (java.lang.ClassNotFoundException e) {
System.err.print("ClassNotFoundException: ");
System.err.println(e.getMessage());
}
try {
con =
DriverManager.getConnection(url, "myLogin", "myPW");
stmt = con.createStatement();
stmt.executeUpdate(dropString);
stmt.executeUpdate(createString);
stmt.close();
stmt = con.createStatement();
stmt.executeUpdate("insert into COFFEES "
+ "values('Colombian', 00101, 7.99, 0, 0)");
stmt.executeUpdate("insert into COFFEES "
+ "values('French_Roast', 00049, 8.99, 0, 0)");
stmt.executeUpdate("insert into COFFEES "
+ "values('Espresso', 00150, 9.99, 0, 0)");
stmt.executeUpdate("insert into COFFEES "
+ "values('Colombian_Decaf', 00101, 8.99, 0, 0)");
stmt.executeUpdate("insert into COFFEES "
+ "values('French_Roast_Decaf', 00049, 9.99, 0, 0)");
ResultSet rs = stmt.executeQuery(query);
System.out.println("Coffee Break Coffees and Prices:");
while (rs.next()) {
String s = rs.getString("COF_NAME");
float f = rs.getFloat("PRICE");
System.out.println(s + " " + f);
}
stmt.close();
con.close();
} catch (SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
}
}
} </pre>
</li>
<li>
<p>
Copy the following files into place:
</p>
<pre class="programlisting">$ cd <workspace>/test_jdbc
$ mkdir -p libs/armeabi
$ cp -r <db>/build_android/jdbc/libs/armeabi/liboracle-jdbc.so \
libs/armeabi
$ cp -r <db>/build_unix/jdbc/sqlite.jar libs</pre>
</li>
<li>
<p>
Back in Eclipse, right click the project name, and
select the <code class="literal">refresh</code> option to reload
the project from the directory. The two new files that
were copied into place in the previous step are now
included in the project view.
</p>
</li>
<li>
<p> Convert the JAR file to the Android Dalvik format: </p>
<div class="orderedlist">
<ol type="a">
<li>
<p>
Right-click on your project.
</p>
</li>
<li>
<p>
Choose <code class="literal">Build Path -> Configure
Build Path</code>
</p>
</li>
<li>
<p>
Click the <code class="literal">Libraries</code> tab.
</p>
</li>
<li>
<p>
Click <code class="literal">Add JARS</code>.
</p>
</li>
</ol>
</div>
</li>
<li>
<p>
Run the project:
</p>
<div class="orderedlist">
<ol type="a">
<li>
<p>
Choose <code class="literal">Property ->
Android</code> and select any one of
the usable build targets.
</p>
</li>
<li>
<p>
Right click the project. Choose
<code class="literal">Run As -> Android</code>
</p>
</li>
</ol>
</div>
</li>
<li>
<p>
Verify your installation. After a short pause
(depending on the speed of your system), the
application logo is displayed. Use the Android adb
command line application to make sure the application
is running as expected:
</p>
<pre class="programlisting">$ cd <android-sdk>/platform-tools
$ ./adb logcat
I/System.out( 539): Appstart:
I/System.out( 539): Coffee Break Coffees and Prices:
I/System.out( 539): Colombian 7.99
I/System.out( 539): French_Roast 8.99
I/System.out( 539): Espresso 9.99
I/System.out( 539): Colombian_Decaf 8.99
I/System.out( 539): French_Roast_Decaf 9.99</pre>
<p>
You can also check if the database
(<code class="literal">example.db</code>) exists in the
emulator:
</p>
<pre class="programlisting">$ ./adb shell ls /data/data/example.testjdbc
example.db
example.db-journal
lib </pre>
<p>
Finally, check the database using the BDB SQL
shell:
</p>
<pre class="programlisting">
$ ./adb push <db>/build_android/jdbc/libs/armeabi/dbsql \
/data/data/example.testjdbc
326 KB/s (1293760 bytes in 3.865s)
$ ./adb shell
root@android:/ # cd /data/data/example.testjdbc
root@android:/data/data/example.testjdbc # ./dbsql example.db
Berkeley DB 11g Release 2, library version 11.2.5.2.36
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
dbsql> .tables
COFFEES
dbsql> select * from COFFEES;
Colombian|101|7.99|0|0
French_Roast|49|8.99|0|0
Espresso|150|9.99|0|0
Colombian_Decaf|101|8.99|0|0
French_Roast_Decaf|49|9.99|0|0
dbsql> .quit </pre>
</li>
</ol>
</div>
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Android </td>
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