android中SQLite数据库中用insert同时插入多条记录的方法和效率比较

    

     在Android开发中我们常会遇到这样一种情况：在建立一个SQLite数据库时，想同时插入大量数据。那么应该怎么做呢？

下面笔者以插入20条记录为例：

1.   将同时插入大量的数据写成一条SQL语句
2.  最笨的方法用insert语句一条一条的输入
3. 使用事务

代码如下：

 

public class DateBaseOpenHelper extends SQLiteOpenHelper {

	    public static final String DBNAME="radiomap";
	    public static final int VERSION=1;
	    public DateBaseOpenHelper(Context context){
	    	super(context,DBNAME,null,VERSION);
	    }
	@Override
	public void onCreate(SQLiteDatabase db) {
		// TODO Auto-generated method stub
       db.execSQL("create table radiomap(location varchar(20),ap1 int,ap2 int)");
       long a=System.currentTimeMillis();
       db.execSQL("insert into radiomap(location,ap1,ap2) select 'x=1,y=1',-80,-73 " +
       		"union all select 'x=2,y=3',80,40 union all select 'x=3,y=5',30,20 "+
    		   "union all select 'x=4,y=5',3,2 union all select 'x=30,y=50',30,20 union all select 'x=3,y=5',40,20"
       		+" union all select 'x=3,y=5',6,20 union all select 'x=3,y=5',6,7 union all select 'x=3,y=5',7,8 union all select 'x=3,y=5',8,9 union all select 'x=3,y=5',9,9" +
       				" union all select 'x=3,y=5',3,5 union all select 'x=3,y=5',7,20 union all select 'x=3,y=5',4,20 union all select 'x=3,y=5',5,20 union all select 'x=3,y=5',6,20" +
       				" union all select 'x=3,y=5',3,6 union all select 'x=3,y=5',7,7 union all select 'x=3,y=5',3,8 union all select 'x=3,y=5',8,2");
       long b=System.currentTimeMillis();
       long c=b-a;
       Log.i("LocationActivity", String.valueOf(c));
       
       a=System.currentTimeMillis();
       db.beginTransaction();
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',2,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',4,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',6,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',2,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',4,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',6,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',1,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',1,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',1,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',2,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',2,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',2,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',3,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',3,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',3,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',4,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=7',5,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',4,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',5,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',5,5)");
       db.setTransactionSuccessful();
       db.endTransaction();
       b=System.currentTimeMillis();
       Log.i("LocationActivity", String.valueOf(b-a));
        
       a=System.currentTimeMillis();
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=7,y=8',7,8)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=8,y=9',8,9)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=9,y=10',9,10)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',2,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',4,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',6,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',2,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',2,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',2,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',3,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',3,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',3,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',4,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',4,4)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',4,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',5,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=7',6,5)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=6,y=7',5,7)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=4,y=5',6,3)");
       db.execSQL("insert into radiomap(location,ap1,ap2) values('x=5,y=6',6,5)");
       b=System.currentTimeMillis();
       Log.i("LocationActivity", String.valueOf(b-a));
	}

第一种方式及：

insert into 表名(列名1,列名2)    
 select  值1,值2
 union all 
 select 值1,值2  
 union all 
 select 值1,值2 

以上三种方式测试结果，及运行效率：

第一种方式为9ms

用事务的为：86ms

第三种直接用insert插入的为：29ms

这是因为本次测试用了20条数据，所以用事务的反而比不用的开销大时间长。若1000条以上则明显快于直接用insert插入的。