ansicasefragment.java

来自「人力资源管理系统主要包括：人员管理、招聘管理、培训管理、奖惩管理和薪金管理五大管」· Java 代码 · 共 38 行

//$Id: ANSICaseFragment.java,v 1.4.2.4 2003/12/15 03:34:39 oneovthafew Exp $
package net.sf.hibernate.sql;

import java.util.Iterator;
import java.util.Map;

/**
 An ANSI SQL CASE expression.
 <br>
 <code>case when ... then ... end as ...</code>
 <br>
 @author Gavin King, Simon Harris
 */
public class ANSICaseFragment extends CaseFragment {

	public String toFragmentString() {
		StringBuffer buf = new StringBuffer( cases.size() * 15 + 10 );

		buf.append("case");

		Iterator iter = cases.entrySet().iterator();
		while ( iter.hasNext() ) {
			Map.Entry me = (Map.Entry) iter.next();
			buf.append(" when ")
				.append( me.getKey() )
				.append(" is not null then ")
				.append( me.getValue() );
		}
		buf.append(" end");
		
		if (returnColumnName!=null) {
			buf.append(" as ")
				.append(returnColumnName);
		}
		
		return buf.toString();
	}
}