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	<title>Der Informatikblog &#187; Array</title>
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	<description>Informatik &#38; Co.</description>
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			<item>
		<title>MySQL Verbindung aufbauen, Query senden, abfragen</title>
		<link>http://www.informatik-blog.net/2009/01/28/mysql-verbindung-aufbauen-query-senden-abfragen/</link>
		<comments>http://www.informatik-blog.net/2009/01/28/mysql-verbindung-aufbauen-query-senden-abfragen/#comments</comments>
		<pubDate>Wed, 28 Jan 2009 21:58:51 +0000</pubDate>
		<dc:creator>Emanuel</dc:creator>
				<category><![CDATA[Java]]></category>
		<category><![CDATA[Array]]></category>
		<category><![CDATA[MySQL]]></category>
		<category><![CDATA[Query]]></category>
		<category><![CDATA[ResultSet]]></category>
		<category><![CDATA[ReturnQuery]]></category>

		<guid isPermaLink="false">http://www.informatik-blog.net/?p=462</guid>
		<description><![CDATA[

Mithilfe des JDBC ist es möglich MySQL Verbindungen aufzubauen und Informationen zu übermitteln und abzufragen. Wie das Beispiel zeigt, senden wir ein einfaches Query an die Datenbank und fragen dieses dann ab. Selbstverständlich ist MySQL weitaus komplexer, worauf sich die Sektion &#8220;SQL&#8221; spezialisiert.
Um ein einfaches Query abzusenden kann folgende Klasse verwendet werden:

hier nun die Klasse [...]]]></description>
			<content:encoded><![CDATA[
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<p>Mithilfe des JDBC ist es möglich MySQL Verbindungen aufzubauen und Informationen zu übermitteln und abzufragen. Wie das Beispiel zeigt, senden wir ein einfaches Query an die Datenbank und fragen dieses dann ab. Selbstverständlich ist MySQL weitaus komplexer, worauf sich die Sektion &#8220;SQL&#8221; spezialisiert.</p>
<p>Um ein einfaches Query abzusenden kann folgende Klasse verwendet werden:</p>
<p><span id="more-462"></span></p>
<p>hier nun die Klasse MySQL .java</p>

<div class="wp_syntax"><div class="code"><pre class="java" style="font-family:monospace;"><span style="color: #000000; font-weight: bold;">package</span> <span style="color: #006699;">mysqltest</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">java.sql.Connection</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">java.sql.DriverManager</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">java.sql.ResultSet</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">java.sql.SQLException</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">java.sql.Statement</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">class</span> MySQL <span style="color: #009900;">&#123;</span>
&nbsp;
    <span style="color: #000000; font-weight: bold;">private</span> <span style="color: #003399;">String</span> Username <span style="color: #339933;">=</span> <span style="color: #0000ff;">&quot;root&quot;</span><span style="color: #339933;">;</span>
    <span style="color: #000000; font-weight: bold;">private</span> <span style="color: #003399;">String</span> Password <span style="color: #339933;">=</span> <span style="color: #0000ff;">&quot;Passwort&quot;</span><span style="color: #339933;">;</span>
    <span style="color: #000000; font-weight: bold;">private</span> <span style="color: #003399;">String</span> <span style="color: #003399;">Driver</span> <span style="color: #339933;">=</span> <span style="color: #0000ff;">&quot;com.mysql.jdbc.Driver&quot;</span><span style="color: #339933;">;</span>
    <span style="color: #000000; font-weight: bold;">private</span> <span style="color: #003399;">String</span> <span style="color: #003399;">URL</span> <span style="color: #339933;">=</span> <span style="color: #0000ff;">&quot;jdbc:mysql://mysql.host.net:3306/datenbank&quot;</span><span style="color: #339933;">;</span>
    <span style="color: #000000; font-weight: bold;">private</span> <span style="color: #003399;">Connection</span> connection<span style="color: #339933;">;</span>
&nbsp;
    <span style="color: #000000; font-weight: bold;">public</span> MySQL<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
        <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">Connect</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #009900;">&#125;</span>
   <span style="color: #666666; font-style: italic;">/* Sollte der Konstruktur ohne argumente aufgerufen werden, werden die in der klasse genutzten Werte genommen. */</span>
&nbsp;
&nbsp;
    <span style="color: #000000; font-weight: bold;">public</span> MySQL<span style="color: #009900;">&#40;</span><span style="color: #003399;">String</span> user, <span style="color: #003399;">String</span> pass<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
        <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">Username</span> <span style="color: #339933;">=</span> user<span style="color: #339933;">;</span>
        <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">Password</span> <span style="color: #339933;">=</span> pass<span style="color: #339933;">;</span>
        <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">Connect</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #009900;">&#125;</span>
&nbsp;
 <span style="color: #666666; font-style: italic;">/* Sollte der Konstruktur mit den Argumenten user und pass aufgerufen werden, werden diese definiert und dann Verbunden. */</span>
&nbsp;
    <span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000066; font-weight: bold;">void</span> Close<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
        <span style="color: #000000; font-weight: bold;">if</span> <span style="color: #009900;">&#40;</span><span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">connection</span> <span style="color: #339933;">!=</span> <span style="color: #000066; font-weight: bold;">null</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
            <span style="color: #000000; font-weight: bold;">try</span> <span style="color: #009900;">&#123;</span>
                <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">connection</span>.<span style="color: #006633;">close</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
            <span style="color: #009900;">&#125;</span> <span style="color: #000000; font-weight: bold;">catch</span> <span style="color: #009900;">&#40;</span><span style="color: #003399;">Exception</span> e<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
            <span style="color: #009900;">&#125;</span>
        <span style="color: #009900;">&#125;</span>
    <span style="color: #009900;">&#125;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">/* Die Funktion Close() schließt das Query um den Speicher wieder frei zu geben */</span>
&nbsp;
    <span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000066; font-weight: bold;">void</span> Connect<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
        <span style="color: #000000; font-weight: bold;">try</span> <span style="color: #009900;">&#123;</span>
            <span style="color: #000000; font-weight: bold;">Class</span>.<span style="color: #006633;">forName</span><span style="color: #009900;">&#40;</span><span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #003399;">Driver</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
            <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">connection</span> <span style="color: #339933;">=</span> <span style="color: #003399;">DriverManager</span>.<span style="color: #006633;">getConnection</span><span style="color: #009900;">&#40;</span><span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #003399;">URL</span>,
                    <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">Username</span>, <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">Password</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span> <span style="color: #000000; font-weight: bold;">catch</span> <span style="color: #009900;">&#40;</span><span style="color: #003399;">Exception</span> e<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
            e.<span style="color: #006633;">printStackTrace</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
            <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Error Connecting with User:&quot;</span> <span style="color: #339933;">+</span> Username <span style="color: #339933;">+</span> <span style="color: #0000ff;">&quot; and Password:&quot;</span> <span style="color: #339933;">+</span> Password<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span>
    <span style="color: #009900;">&#125;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">/* Connect registriert den JDBC Treiber und versucht eine Verbindung herzustellen. Sollte dies nicht möglich sein, wird eine Exception ausgelöst */</span>
&nbsp;
    <span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000066; font-weight: bold;">boolean</span> isConnected<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
        <span style="color: #000000; font-weight: bold;">try</span> <span style="color: #009900;">&#123;</span>
            <span style="color: #003399;">ResultSet</span> rs <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">ReturnQuery</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;SELECT 1;&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
            <span style="color: #000000; font-weight: bold;">if</span> <span style="color: #009900;">&#40;</span>rs <span style="color: #339933;">==</span> <span style="color: #000066; font-weight: bold;">null</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
                <span style="color: #000000; font-weight: bold;">return</span> <span style="color: #000066; font-weight: bold;">false</span><span style="color: #339933;">;</span>
            <span style="color: #009900;">&#125;</span>
            <span style="color: #000000; font-weight: bold;">if</span> <span style="color: #009900;">&#40;</span>rs.<span style="color: #006633;">next</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
                <span style="color: #000000; font-weight: bold;">return</span> <span style="color: #000066; font-weight: bold;">true</span><span style="color: #339933;">;</span>
            <span style="color: #009900;">&#125;</span>
            <span style="color: #000000; font-weight: bold;">return</span> <span style="color: #000066; font-weight: bold;">false</span><span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span> <span style="color: #000000; font-weight: bold;">catch</span> <span style="color: #009900;">&#40;</span><span style="color: #003399;">Exception</span> e<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
            <span style="color: #000000; font-weight: bold;">return</span> <span style="color: #000066; font-weight: bold;">false</span><span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span>
    <span style="color: #009900;">&#125;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">/* frägt ein einfaches Query ab, welches &quot;1&quot; zurück liefert, falls man verbunden ist */</span>
&nbsp;
    <span style="color: #000000; font-weight: bold;">public</span> <span style="color: #003399;">ResultSet</span> ReturnQuery<span style="color: #009900;">&#40;</span><span style="color: #003399;">String</span> query<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
        <span style="color: #000000; font-weight: bold;">try</span> <span style="color: #009900;">&#123;</span>
            <span style="color: #003399;">Statement</span> stmt <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">connection</span>.<span style="color: #006633;">createStatement</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
            <span style="color: #003399;">ResultSet</span> rs <span style="color: #339933;">=</span> stmt.<span style="color: #006633;">executeQuery</span><span style="color: #009900;">&#40;</span>query<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
            <span style="color: #000000; font-weight: bold;">return</span> rs<span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span> <span style="color: #000000; font-weight: bold;">catch</span> <span style="color: #009900;">&#40;</span><span style="color: #003399;">SQLException</span> e<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
            <span style="color: #003399;">System</span>.<span style="color: #006633;">err</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>e.<span style="color: #006633;">toString</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
            <span style="color: #000000; font-weight: bold;">return</span> <span style="color: #000066; font-weight: bold;">null</span><span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span>
    <span style="color: #009900;">&#125;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">/* Sendet ein Query und erwartet eine Rückgabe in Form eines ResultSet */</span>
&nbsp;
    <span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000066; font-weight: bold;">boolean</span> RunQuery<span style="color: #009900;">&#40;</span><span style="color: #003399;">String</span> query<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
        <span style="color: #000000; font-weight: bold;">try</span> <span style="color: #009900;">&#123;</span>
            <span style="color: #003399;">Statement</span> stmt <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">this</span>.<span style="color: #006633;">connection</span>.<span style="color: #006633;">createStatement</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
            <span style="color: #000000; font-weight: bold;">return</span> stmt.<span style="color: #006633;">execute</span><span style="color: #009900;">&#40;</span>query<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span> <span style="color: #000000; font-weight: bold;">catch</span> <span style="color: #009900;">&#40;</span><span style="color: #003399;">Exception</span> e<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
            <span style="color: #666666; font-style: italic;">//  e.printStackTrace();</span>
            <span style="color: #000000; font-weight: bold;">return</span> <span style="color: #000066; font-weight: bold;">false</span><span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span>
    <span style="color: #009900;">&#125;</span>
<span style="color: #666666; font-style: italic;">/* Führt das query aus, erwartet aber keine Rückantwort des Servers. */</span>
&nbsp;
<span style="color: #009900;">&#125;</span></pre></div></div>

<p>um in MySQL zu verbinden wird diese klasse folgendermaßen aufgerufen:</p>

<div class="wp_syntax"><div class="code"><pre class="java" style="font-family:monospace;"><span style="color: #000000; font-weight: bold;">package</span> <span style="color: #006699;">mysqltest</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #000000; font-weight: bold;">import</span> <span style="color: #006699;">MySQL</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #008000; font-style: italic; font-weight: bold;">/**
 *
 * @author li
 */</span>
<span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">class</span> Main <span style="color: #009900;">&#123;</span>
    <span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">static</span> <span style="color: #000066; font-weight: bold;">void</span> main<span style="color: #009900;">&#40;</span><span style="color: #003399;">String</span><span style="color: #009900;">&#91;</span><span style="color: #009900;">&#93;</span> args<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
        db <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> MySQL<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #003399;">ResultSet</span> rs <span style="color: #339933;">=</span> db.<span style="color: #006633;">ReturnQuery</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;select count(*) as num from test where a='1'&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #000000; font-weight: bold;">while</span> <span style="color: #009900;">&#40;</span>rs.<span style="color: #006633;">next</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
            countRows <span style="color: #339933;">=</span> rs.<span style="color: #006633;">getInt</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;num&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span>
        <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>countRows<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #009900;">&#125;</span>
<span style="color: #009900;">&#125;</span></pre></div></div>

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]]></content:encoded>
			<wfw:commentRss>http://www.informatik-blog.net/2009/01/28/mysql-verbindung-aufbauen-query-senden-abfragen/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Strings zerlegen</title>
		<link>http://www.informatik-blog.net/2009/01/22/strings-zerlegen/</link>
		<comments>http://www.informatik-blog.net/2009/01/22/strings-zerlegen/#comments</comments>
		<pubDate>Thu, 22 Jan 2009 18:03:48 +0000</pubDate>
		<dc:creator>Emanuel</dc:creator>
				<category><![CDATA[Java]]></category>
		<category><![CDATA[Array]]></category>
		<category><![CDATA[split]]></category>

		<guid isPermaLink="false">http://www.informatik-blog.net/?p=83</guid>
		<description><![CDATA[

Sehr oft wird auch das String zerlegen genutzt. Um diese Simple aufgabe zu meistern gebe ich euch einen kleinen Codesnippet mit, mit dem ihr einfach einen String in ein Array zerlegen könnt. Die ausgabe lautet:

Das ist zeile 1
und das ist zeile 2


String data = &#34;Hallo Welt! Wie läufts?&#34;;
String&#91;&#93; buf = data.split&#40;&#34; &#34;&#41;;
String text = &#34;Das [...]]]></description>
			<content:encoded><![CDATA[
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<p>Sehr oft wird auch das String zerlegen genutzt. Um diese Simple aufgabe zu meistern gebe ich euch einen kleinen Codesnippet mit, mit dem ihr einfach einen String in ein Array zerlegen könnt. Die ausgabe lautet:<br />
<span id="more-83"></span><br />
<strong>Das ist zeile 1<br />
und das ist zeile 2<br />
</strong></p>

<div class="wp_syntax"><div class="code"><pre class="java" style="font-family:monospace;"><span style="color: #003399;">String</span> data <span style="color: #339933;">=</span> <span style="color: #0000ff;">&quot;Hallo Welt! Wie läufts?&quot;</span><span style="color: #339933;">;</span>
<span style="color: #003399;">String</span><span style="color: #009900;">&#91;</span><span style="color: #009900;">&#93;</span> buf <span style="color: #339933;">=</span> data.<span style="color: #006633;">split</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot; &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #003399;">String</span> text <span style="color: #339933;">=</span> <span style="color: #0000ff;">&quot;Das ist zeile 1n und das ist zeile 2&quot;</span><span style="color: #339933;">;</span>
<span style="color: #003399;">String</span><span style="color: #009900;">&#91;</span><span style="color: #009900;">&#93;</span> words <span style="color: #339933;">=</span> text.<span style="color: #006633;">split</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;<span style="color: #000099; font-weight: bold;">\s</span>+&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>words<span style="color: #009900;">&#91;</span><span style="color: #cc66cc;">0</span><span style="color: #009900;">&#93;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
<span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>words<span style="color: #009900;">&#91;</span><span style="color: #cc66cc;">1</span><span style="color: #009900;">&#93;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span></pre></div></div>

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