AllMediaContentProvider.java

package com.android.database;

import android.R.integer;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.util.Log;

/**
* 
*    
* 项目名称：allTest   
* 类名称：MyFirstContentProvider   
* 类描述：   
* 创建人：fht   
* 创建时间：Apr 13, 2015 9:15:31 PM   
* 修改人：fht   
* 修改时间：Apr 13, 2015 9:15:31 PM   
* 修改备注：   
* @version    
*
*/

public class AllMediaContentProvider extends ContentProvider {
	//定义一个URI的匹配器，用于匹配uri，如果路径不满足条件返回-1
	private static UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
	private static final int INSERT = 1;
	private static final int DELETE = 2;
	private static final int UPDATE = 3;
	private static final int QUERY = 4;
	private static final int QUERYONE = 5;
	
	private MyHelper myHelper = null;
	
	//content://com.feng.database.firstprovider/insert 添加
	//content://com.feng.database.firstprovider/delete 删除
	//content://com.feng.database.firstprovider/update 更新
	//content://com.feng.database.firstprovider/query  查询
	static {
		matcher.addURI("com.feng.database.firstprovider", "insert", INSERT);
		matcher.addURI("com.feng.database.firstprovider", "delete", DELETE);
		matcher.addURI("com.feng.database.firstprovider", "update", UPDATE);
		matcher.addURI("com.feng.database.firstprovider", "query", QUERY);
		matcher.addURI("com.feng.database.firstprovider", "query/#", QUERYONE);//任意
	}

	@Override
	public boolean onCreate() {
		Log.i("fenghaitao", "first contentprovider ...");
		myHelper = new MyHelper(getContext(),DBInfo.DB.DB_NAME,null,DBInfo.DB.DB_VERSION);
		return (myHelper == null)?false:true;
	}
	
	/*
	 * 添加数据
	 * @see android.content.ContentProvider#insert(android.net.Uri, android.content.ContentValues)
	 */
	@Override
	public Uri insert(Uri uri, ContentValues values) {
		// TODO Auto-generated method stub
		try {
			if(matcher.match(uri)==INSERT){
				Log.i("fenghaitao", "insert");
				SQLiteDatabase db = myHelper.getWritableDatabase();
				db.insert(DBInfo.Table.TABLE_NAME, null, values);
				db.close();
			}else{
				throw new IllegalArgumentException("path error,do not insert data");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
		
	}
	
	/*
	 * 删除数据
	 * @see android.content.ContentProvider#delete(android.net.Uri, java.lang.String, java.lang.String[])
	 */
	@Override
	public int delete(Uri uri, String selection, String[] selectionStrings) {
		// TODO Auto-generated method stub
		int result = 0;
		try {
			if(matcher.match(uri)==DELETE){
				SQLiteDatabase db = myHelper.getWritableDatabase();
				result = db.delete(DBInfo.Table.TABLE_NAME, selection, selectionStrings);
				
			}else{
				throw new IllegalArgumentException("path error , do not delete data");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	
	/*
	 * 更新数据
	 * @see android.content.ContentProvider#update(android.net.Uri, android.content.ContentValues, java.lang.String, java.lang.String[])
	 */
	@Override
	public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
		// TODO Auto-generated method stub
		int result = 0;
		try {
			if(matcher.match(uri)==UPDATE){
				SQLiteDatabase db = myHelper.getWritableDatabase();
				result = db.update(DBInfo.Table.TABLE_NAME, values, selection, selectionArgs);
				
			}else{
				throw new  IllegalArgumentException("path error , do not update data");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	
	
	/*
	 * 查询数据
	 * 
	 */
	@Override
	public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
			String sortOrder) {
		// TODO Auto-generated method stub
		Cursor cursor = null;
		try {
			if(matcher.match(uri)==QUERY){
				Log.i("fenghaitao", "query");
				SQLiteDatabase db = myHelper.getReadableDatabase();
				cursor = db.query(DBInfo.Table.TABLE_NAME, projection, selection, selectionArgs, null, null, null);
				
				Log.i("fenghaitao", "cursor"+cursor.getCount());
			}else if (matcher.match(uri)==QUERYONE){
				Log.i("fenghaitao", "queryone");
				SQLiteDatabase db = myHelper.getReadableDatabase();
				long id = ContentUris.parseId(uri);
				cursor = db.query(DBInfo.Table.TABLE_NAME, projection, "_id=?", new String[]{id+""}, null, null, null);
			
			}else {
				throw new IllegalAccessException("path error , do not query data");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return cursor;
	}

	@Override
	public String getType(Uri uri) {
		// TODO Auto-generated method stub
		if(matcher.match(uri) == QUERY){
			return "com.feng.database.firstprovider";
		}
		return null;
	}

	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
}