纸牌游戏之三

11数据库连接类MyDatabaseHelper类
 

  

   

    

     

    
    

     

      </pre><pre code_snippet_id="1727164" snippet_file_name="blog_20160623_3_3108055" name="code" class="java">package com.example.azhipai;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      import android.content.Context;
     
    
   

    

     

    
    

     

      import android.database.sqlite.SQLiteDatabase;
     
    
   

    

     

    
    

     

      import android.database.sqlite.SQLiteDatabase.CursorFactory;
     
    
   

    

     

    
    

     

      import android.database.sqlite.SQLiteOpenHelper;
     
    
   

    

     

    
    

     

      import android.widget.Toast;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      public class MyDatabaseHelper extends SQLiteOpenHelper{
     
    
   

    

     

    
    

     
	public static final String CREATE_EXAM="create table exam(id integer primary key autoincrement,name text,examcm integer)";
     
    
   

    

     

    
    

     
	private Context mcontext;
     
    
   

    

     

    
    

     
	public MyDatabaseHelper(Context context, String name,
     
    
   

    

     

    
    

     

       CursorFactory factory, int version) {
     
    
   

    

     

    
    

     
		super(context, name, factory, version);
     
    
   

    

     

    
    

     

      		mcontext=context;
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	@Override
     
    
   

    

     

    
    

     
	public void onCreate(SQLiteDatabase db) {
     
    
   

    

     

    
    

     

      		db.execSQL(CREATE_EXAM);
     
    
   

    

     

    
    

     

      		Toast.makeText(mcontext, "创建数据库成功", Toast.LENGTH_LONG).show();
     
    
   

    

     

    
    

     
		
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	@Override
     
    
   

    

     

    
    

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

    

     

    
    

     

      		db.execSQL("drop table if exists exam");//删除表若果表存在
     
    
   

    

     

    
    

     

      		onCreate(db);
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
  
 

文章来源: aaaedu.blog.csdn.net，作者：tea_year，版权归原作者所有，如需转载，请联系作者。

原文链接：aaaedu.blog.csdn.net/article/details/51746021