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	<title>拈花微笑 &#187; sql</title>
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		<title>如何在Hibernate中让SQLServer使用nvarchar代替varchar</title>
		<link>http://www.jayxu.com/2010/11/23/10275/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=%25e5%25a6%2582%25e4%25bd%2595%25e5%259c%25a8hibernate%25e4%25b8%25ad%25e8%25ae%25a9sqlserver%25e4%25bd%25bf%25e7%2594%25a8nvarchar%25e4%25bb%25a3%25e6%259b%25bfvarchar</link>
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		<pubDate>Tue, 23 Nov 2010 08:19:38 +0000</pubDate>
		<dc:creator>Jay</dc:creator>
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		<description><![CDATA[有关SQLServer中varchar和nvarchar的区别可以直接去google。一般在中文系统中应该使用nvarchar作为字符串的对应类型，但是Hibernate中的默认实现SQLServerDialect使用了varchar。以下方法可以简单地转为使用nvarchar： 自己写一个dialect，继承SQLServerDialect，在构造器中将原先varchar类型的注册声明覆盖： registerColumnType&#40;Types.VARCHAR, &#34;nvarchar($l)&#34;&#41;; registerColumnType(Types.VARCHAR, "nvarchar($l)"); 千万注意，“$”后面的是字段长度的占位符，是“l(ength)”，而不是数字“1”（因为看hibernate的doc时没分清“l”和“1”，浪费了我一上午去找原因） 然后在hibernate的配置文件中将hibernate.dialect的值设为你的dialect实现类就OK了 原创内容，转载请注明： 转载自拈花微笑 本文链接地址: 如何在Hibernate中让SQLServer使用nvarchar代替varchar<table class="wumii-related-items" cellspacing="0" cellpadding="2" border="0" width="100%" style="clear: both;">
    
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			<content:encoded><![CDATA[<p>有关SQLServer中varchar和nvarchar的区别可以直接去google。一般在中文系统中应该使用nvarchar作为字符串的对应类型，但是Hibernate中的默认实现SQLServerDialect使用了varchar。以下方法可以简单地转为使用nvarchar：</p>
<p>自己写一个dialect，继承SQLServerDialect，在构造器中将原先varchar类型的注册声明覆盖：</p>

<div class="bwp-syntax-block clearfix">
<div class="bwp-syntax-toolbar"><div class="bwp-syntax-control"><a href="javascript:;" class="bwp-syntax-source-switch" title="View Source Code"></a></div></div>
<div class="bwp-syntax-wrapper clearfix bwp-syntax-advanced"><div class="java"><ol><li class="li1"><div class="de1">registerColumnType<span class="br0">&#40;</span><span class="kw3">Types</span>.<span class="me1">VARCHAR</span>, <span class="st0">&quot;nvarchar($l)&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li>
</ol></div></div>
<div class="bwp-syntax-source"><pre class="no-parse">registerColumnType(Types.VARCHAR, "nvarchar($l)");</pre></div></div>

<p>千万注意，“$”后面的是字段长度的占位符，是“l(ength)”，而不是数字“1”（因为看hibernate的doc时没分清“l”和“1”，浪费了我一上午去找原因）</p>
<p>然后在hibernate的配置文件中将hibernate.dialect的值设为你的dialect实现类就OK了
<div style="margin-top: 15px; font-style: italic">
<p><strong>原创内容，转载请注明：</strong> 转载自<a href="http://www.jayxu.com/">拈花微笑</a></p>
<p><strong>本文链接地址:</strong> <a href="http://www.jayxu.com/2010/11/23/10275/">如何在Hibernate中让SQLServer使用nvarchar代替varchar</a></p>
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		</item>
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		<title>小心Derby的ResultSet陷阱</title>
		<link>http://www.jayxu.com/2008/11/09/59/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=%25e5%25b0%258f%25e5%25bf%2583derby%25e7%259a%2584resultset%25e9%2599%25b7%25e9%2598%25b1</link>
		<comments>http://www.jayxu.com/2008/11/09/59/#comments</comments>
		<pubDate>Sun, 09 Nov 2008 09:19:21 +0000</pubDate>
		<dc:creator>Jay</dc:creator>
				<category><![CDATA[技术生活]]></category>
		<category><![CDATA[derby]]></category>
		<category><![CDATA[java]]></category>
		<category><![CDATA[jdbc]]></category>
		<category><![CDATA[sql]]></category>
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			<content:encoded><![CDATA[<p>Derby作为一个纯Java实现的嵌入式DB一直很受Java社区的欢迎，在我们的项目中也用到了。但昨天晚上遇到的一个问题让我对Derby相当失望——Derby实现的ResultSet会将列名中的表名抹掉<br />
具体代码：<br />
SQL：</p>
<pre>SELECT staff.staffid FROM staff WHERE ...</pre>
<p>JDBC：</p>

<div class="bwp-syntax-block clearfix">
<div class="bwp-syntax-toolbar"><div class="bwp-syntax-control"><a href="javascript:;" class="bwp-syntax-source-switch" title="View Source Code"></a></div></div>
<div class="bwp-syntax-wrapper clearfix bwp-syntax-advanced"><div class="java"><ol><li class="li1"><div class="de1"><span class="kw3">ResultSet</span> rs <span class="sy0">=</span> stmt.<span class="me1">executeQuery</span><span class="br0">&#40;</span>...<span class="br0">&#41;</span><span class="sy0">;</span></div></li>
<li class="li2"><div class="de2"><span class="kw1">if</span><span class="br0">&#40;</span>rs.<span class="me1">next</span><span class="br0">&#40;</span><span class="br0">&#41;</span><span class="br0">&#41;</span><span class="br0">&#123;</span></div></li>
<li class="li1"><div class="de1">&nbsp; &nbsp; <span class="kw3">String</span> id <span class="sy0">=</span> rs.<span class="me1">getString</span><span class="br0">&#40;</span><span class="st0">&quot;staff.id&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li>
<li class="li2"><div class="de2"><span class="br0">&#125;</span></div></li>
</ol></div></div>
<div class="bwp-syntax-source"><pre class="no-parse">ResultSet rs = stmt.executeQuery(...);
if(rs.next()){
    String id = rs.getString("staff.id");
}</pre></div></div>

<p>运行时抛出异常：</p>

<div class="bwp-syntax-block clearfix">
<div class="bwp-syntax-toolbar"><div class="bwp-syntax-control"><a href="javascript:;" class="bwp-syntax-source-switch" title="View Source Code"></a></div></div>
<div class="bwp-syntax-wrapper clearfix bwp-syntax-advanced"><div class="java"><ol><li class="li1"><div class="de1">Caused by<span class="sy0">:</span> java.<span class="me1">sql</span>.<span class="kw3">SQLException</span><span class="sy0">:</span> 列“staff.<span class="me1">staffid</span>”未找到。</div></li>
<li class="li2"><div class="de2">&nbsp; &nbsp; at org.<span class="me1">apache</span>.<span class="me1">derby</span>.<span class="me1">impl</span>.<span class="me1">jdbc</span>.<span class="me1">SQLExceptionFactory</span>.<span class="me1">getSQLException</span><span class="br0">&#40;</span>Unknown Source<span class="br0">&#41;</span></div></li>
<li class="li1"><div class="de1">&nbsp; &nbsp; at org.<span class="me1">apache</span>.<span class="me1">derby</span>.<span class="me1">impl</span>.<span class="me1">jdbc</span>.<span class="kw3">Util</span>.<span class="me1">newEmbedSQLException</span><span class="br0">&#40;</span>Unknown Source<span class="br0">&#41;</span></div></li>
<li class="li2"><div class="de2">&nbsp; &nbsp; at org.<span class="me1">apache</span>.<span class="me1">derby</span>.<span class="me1">impl</span>.<span class="me1">jdbc</span>.<span class="kw3">Util</span>.<span class="me1">newEmbedSQLException</span><span class="br0">&#40;</span>Unknown Source<span class="br0">&#41;</span></div></li>
<li class="li1"><div class="de1">&nbsp; &nbsp; at org.<span class="me1">apache</span>.<span class="me1">derby</span>.<span class="me1">impl</span>.<span class="me1">jdbc</span>.<span class="kw3">Util</span>.<span class="me1">generateCsSQLException</span><span class="br0">&#40;</span>Unknown Source<span class="br0">&#41;</span></div></li>
<li class="li2"><div class="de2">&nbsp; &nbsp; at org.<span class="me1">apache</span>.<span class="me1">derby</span>.<span class="me1">impl</span>.<span class="me1">jdbc</span>.<span class="me1">EmbedConnection</span>.<span class="me1">newSQLException</span><span class="br0">&#40;</span>Unknown Source<span class="br0">&#41;</span></div></li>
<li class="li1"><div class="de1">&nbsp; &nbsp; at org.<span class="me1">apache</span>.<span class="me1">derby</span>.<span class="me1">impl</span>.<span class="me1">jdbc</span>.<span class="me1">ConnectionChild</span>.<span class="me1">newSQLException</span><span class="br0">&#40;</span>Unknown Source<span class="br0">&#41;</span></div></li>
<li class="li2"><div class="de2">&nbsp; &nbsp; at org.<span class="me1">apache</span>.<span class="me1">derby</span>.<span class="me1">impl</span>.<span class="me1">jdbc</span>.<span class="me1">EmbedResultSet</span>.<span class="me1">findColumnName</span><span class="br0">&#40;</span>Unknown Source<span class="br0">&#41;</span></div></li>
<li class="li1"><div class="de1">&nbsp; &nbsp; at org.<span class="me1">apache</span>.<span class="me1">derby</span>.<span class="me1">impl</span>.<span class="me1">jdbc</span>.<span class="me1">EmbedResultSet</span>.<span class="me1">getString</span><span class="br0">&#40;</span>Unknown Source<span class="br0">&#41;</span></div></li>
</ol></div></div>
<div class="bwp-syntax-source"><pre class="no-parse">Caused by: java.sql.SQLException: 列“staff.staffid”未找到。
	at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.EmbedConnection.newSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.ConnectionChild.newSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.EmbedResultSet.findColumnName(Unknown Source)
	at org.apache.derby.impl.jdbc.EmbedResultSet.getString(Unknown Source)</pre></div></div>

<p>如果将select语句中的“staff.staffid”改成“staffid”则不会抛出上述异常。在项目中为了保持数量庞大的SQL语句的正确性和可维护性，一般会将表名、列名定义为常量。这样对于Derby数据库就需要一套特殊的、不带表名的列名常量，给代码维护带来很大的麻烦。不知道Sun将Derby这样实现的原因是什么，这个功能点的实现也不是很麻烦，打算去提交bug
<div style="margin-top: 15px; font-style: italic">
<p><strong>原创内容，转载请注明：</strong> 转载自<a href="http://www.jayxu.com/">拈花微笑</a></p>
<p><strong>本文链接地址:</strong> <a href="http://www.jayxu.com/2008/11/09/59/">小心Derby的ResultSet陷阱</a></p>
</div>
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		<item>
		<title>Hacker</title>
		<link>http://www.jayxu.com/2005/07/19/206/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=hacker</link>
		<comments>http://www.jayxu.com/2005/07/19/206/#comments</comments>
		<pubDate>Tue, 19 Jul 2005 10:23:00 +0000</pubDate>
		<dc:creator>Jay</dc:creator>
				<category><![CDATA[技术生活]]></category>
		<category><![CDATA[sql]]></category>
		<category><![CDATA[破解]]></category>

		<guid isPermaLink="false">http://ijay.net.cn/log/?p=206</guid>
		<description><![CDATA[原创内容，转载请注明： 转载自拈花微笑 本文链接地址: Hacker<table class="wumii-related-items" cellspacing="0" cellpadding="2" border="0" width="100%" style="clear: both;">
    
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