datafetcher.java

EOmodeler 读取数据库的方法

package edu.thu.airlinerecovery.eof;



import java.util.List;

import com.webobjects.eoaccess.EODatabaseContext;
import com.webobjects.eoaccess.EOModel;
import com.webobjects.eoaccess.EOModelGroup;
import com.webobjects.eoaccess.EOUtilities;
import com.webobjects.eocontrol.EOEditingContext;
import com.webobjects.eocontrol.EOFetchSpecification;
import com.webobjects.eocontrol.EOObjectStoreCoordinator;
import com.webobjects.eocontrol.EOQualifier;
import com.webobjects.foundation.NSArray;
import com.webobjects.foundation.NSDictionary;
import com.webobjects.foundation.NSMutableDictionary;

/**
 * @author Huang Ke
 * @version $Id: DataFetcher.java,v 1.1 2007/12/14 11:36:59 lzh Exp $
 */

public class DataFetcher {

	EOEditingContext ec;
	String entityName;
	NSArray fetchResult = null;

	
	public DataFetcher(){
			
		ec = new ContextGetter().getEOEditingContext();    		
		
	}
	
	private NSArray getEntityByName(String entityName) {
		try {
			fetchResult=EOUtilities.objectsForEntityNamed(ec, entityName);
		} catch (Exception e) {
			System.out.println(e);
			fetchResult = new NSArray();
		}
		return fetchResult;
	}
	
	private int getObjectsNum(String entityName){
		int i;
		try {
			i=this.getEntityByName(entityName).count();
		} catch (Exception e) {
			System.out.println(e);
			i=0;
		}
		return i;
	}
	
	

	public NSArray getObjectsWithSpecification(String entityName, EOQualifier qualifier, NSArray sortOrderings){
		
		try {
			fetchResult=ec.objectsWithFetchSpecification(new EOFetchSpecification (entityName, qualifier, sortOrderings));
			
		} catch (Exception e) {
			System.out.println(e);
			fetchResult = new NSArray();
		}
		return fetchResult;
	}
	

}