android Sqlite数据库事务处理*.sql 语句集文件

建库主DbHelpers2.java：

/*

 * Copyright 2009 eFANsoftware

 * 

 * Licensed under the Apache License, Version 2.0 (the "License"); you may not

 * use this file except in compliance with the License. You may obtain a copy of

 * the License at

 * 

 * http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

 * License for the specific language governing permissions and limitations under

 * the License.

 */

package net.shoxi.database;



import java.io.BufferedReader;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;



import net.shoxi.www.view.R;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteOpenHelper;

import android.util.Log;



public class DbHelper2 extends SQLiteOpenHelper {

	private static final String VERSION = "1.00";

	private static final int DB_VERSION = (int) (Float.parseFloat(VERSION) * 100);

	private static final String DB_PATH = "medicine.db";



	private static DbHelper2 dbHelper;



	private Context ctx;



	public DbHelper2(Context ctx) {

		

		super(ctx, DB_PATH, null, DB_VERSION);

		this.ctx = ctx;

		

	}



	public static DbHelper2 getInstance(Context ctx) {

		if (dbHelper == null) {

			dbHelper = new DbHelper2(ctx);

		}



		return dbHelper;

	}



	@Override

	public void onCreate(SQLiteDatabase db) {

		try {

			// 开始事务

			db.beginTransaction();



			// create db ZZ

			applySQLs(db, R.raw.db_create);



			// 设置事务成功的标志

			db.setTransactionSuccessful();

		} catch (Exception e) {

			Log.e(this.getClass().getName(), "", e);

			throw new RuntimeException(

					"Database create error! Please contact the support or developer.",

					e);

		} finally {

			// 关闭事务

			db.endTransaction();

		}



	}



	



	/**

	 * 批量执行sql语句

	 * 

	 * @param db

	 * @param sqlResourceId

	 * @throws IOException

	 */

	private void applySQLs(SQLiteDatabase db, int sqlResourceId)

			throws IOException {

		InputStream tmpIS = ctx.getResources().openRawResource(sqlResourceId);

		InputStreamReader tmpReader = new InputStreamReader(tmpIS);

		BufferedReader tmpBuf = new BufferedReader(tmpReader);



		StringBuffer sql = new StringBuffer();

		String tmpStr = null;

		while ((tmpStr = tmpBuf.readLine()) != null) {

			sql.append(tmpStr);

			sql.append('\n');

			if (tmpStr.trim().endsWith(";")) {

				db.execSQL(sql.toString());

				sql = new StringBuffer();

			}

		}



		tmpBuf.close();

		tmpReader.close();

		tmpIS.close();

	}



	@Override

	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

		try {

			db.beginTransaction();

			applySQLs(db, R.raw.db_clean);

			onCreate(db);

			db.setTransactionSuccessful();

		} catch (Exception e) {

			Log.e(this.getClass().getName(), "", e);

			throw new RuntimeException(

					"Database upgrade error! Please contact the support or developer.",

					e);

		} finally {

			db.endTransaction();

		}

	}

}

 导出的.sql SQL语句集文件

db_create.sql文件：

create table th_cate_x

(

PK_ID integer primary key autoincrement,

VALUE text not null,

_ORDER integer not null

);

create table th_category

(

PK_ID integer primary key autoincrement,

VALUE text not null,

PARENT_ID integer not null

);

create table th_com_users

(

PK_ID integer primary key autoincrement,

USERNAME text not null,

PASSWORD text not null,

EMAIL text not null

);

create table th_content

(

PK_ID integer primary key autoincrement,

VALUE1 text not null,

VALUE2 text not null,

VALUE3 text not null,

VALUE4 text not null,

VALUE5 text not null

);

create table th_user

(

PK_ID integer primary key autoincrement,

USERNAME text not null,

PASSWORD text not null,

REALNAME text not null,

EMAIL text not null,

PARENT_ID integer not null

);

 db_clean.sql 文件:

DROP TABLE IF EXISTS `th_admin_users`;

DROP TABLE IF EXISTS `th_cate_x`;

DROP TABLE IF EXISTS `th_category`;

DROP TABLE IF EXISTS `th_com_users`;

DROP TABLE IF EXISTS `th_content`;

DROP TABLE IF EXISTS `th_user`;