优雅的处理Android数据库升级的问题

原始完成于：2015-04-27 19:28:22

提供一种思路，优雅的处理Android数据库升级的问题，直接上代码：

 1 package com.example.databaseissuetest;

 2 

 3 import android.content.Context; 4 import android.database.sqlite.SQLiteDatabase; 5 import android.database.sqlite.SQLiteOpenHelper; 6 import android.text.TextUtils; 7 import android.util.Log; 8 9 public class DatabaseHelper extends SQLiteOpenHelper { 10 public static final String DB_NAME = "test_db"; 11 12 private static final String[] COL_SQLS = { 13 "create table test_tb (id integer primary key autoincrement, name text, age int)", 14 "alter table test_tb add class text", 15 "alter table test_tb add friends integer default 3", 16  }; 17 18 public DatabaseHelper(Context context) { 19 super(context, DB_NAME, null, COL_SQLS.length); 20 Log.e("David", "DatabaseHelper"); 21  } 22 23  @Override 24 public void onCreate(SQLiteDatabase db) { 25 Log.e("David", "onCreate"); 26 onUpgrade(db, 0, COL_SQLS.length); 27  } 28 29  @Override 30 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 31 Log.e("David", "onUpgrade oldVersion = " + oldVersion); 32 Log.e("David", "onUpgrade newVersion = " + newVersion); 33 for (int i = oldVersion; i < COL_SQLS.length; i++) { 34 String sql = COL_SQLS[i]; 35 if (!TextUtils.isEmpty(sql)) { 36  db.execSQL(sql); 37  } 38  } 39  } 40 }