Question

我正在使用Eclipse ADT。我想做一些事情，当我按下此按钮时，用户名，经度，纬度等信息存储在使用SQLite数据库浏览器创建的表中。我从老师那里了解到我必须使用insert sql之类的东西。但我对android很新，不知道完整的代码是什么。有人可以帮我这个吗？

我已经看过像upsert这样的问题但没有插入或更新，但我不知道其中的区别。

Answer 1

我认为你不必将数据从数据库中的数据复制到新数据库，只需使用以下代码将资产中的数据库复制到android中的数据库位置。

扩展SQLiteOpenHelper

的类的完整代码

public class MYDB {


Context c;
public DbHelpr dbhlpr;

String DB_NAME="DB.db";
int DB_VERSION=1;
int count,j;
public String DB_PATH;
public MYDB(Context c) 
{
    // TODO Auto-generated constructor stub
    this.c=c;

    dbhlpr=new DbHelpr(c);


//  dbReadable=dbhlpr.getReadableDatabase();

}
public void close()
{
    dbhlpr.close();


}
public class DbHelpr extends SQLiteOpenHelper
{

    public DbHelpr(Context c) 
    {
        super(c, DB_NAME,null, DB_VERSION);

        DB_PATH = c.getApplicationInfo().dataDir + "/databases/";

        createDataBase()    ;
    }

    public void createDataBase() 
    {
         boolean mDataBaseExist = checkDataBase();
            if(!mDataBaseExist)
            {

                copyDatabase();
            }

    }

     //Check that the database exists here: /data/data/your package/databases/Da Name
    private boolean checkDataBase()
    {
        File dbFile = new File(DB_PATH + DB_NAME);
        //system.out.println("DB file: "+DB_PATH + DB_NAME);
        //Log.v("dbFile", dbFile + "   "+ dbFile.exists());
        return dbFile.exists();
    }

    //Copy the database from assets
    private void copyDataBase() throws IOException
    {
        InputStream mInput =   c.getAssets().open("DB_NAME.EXTENSION");

        String outFileName = DB_PATH + DB_NAME;
        OutputStream mOutput = new FileOutputStream(outFileName);
        byte[] mBuffer = new byte[1024];
        int mLength;
        while ((mLength = mInput.read(mBuffer))>0)
        {
            mOutput.write(mBuffer, 0, mLength);
        }
        mOutput.flush();
        mOutput.close();
        mInput.close();        

    }  

    @Override
    public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) 
    {
        // TODO Auto-generated method stub          
    }

    @Override
    public void onCreate(SQLiteDatabase db) 
    {
        // TODO Auto-generated method stub
    }
}




public int readDBTableFieldCount(String table) {
    // TODO Auto-generated method stub
    SQLiteDatabase db=dbhlpr.getReadableDatabase();
    Cursor cr=db.query(table, null, null, null, null, null, null);      
    int count=cr.getCount();
    cr.close();
    db.close();
    return count;
}

private void insertDataTo_rssFeed(int _id, int title_id, int sub_id,String title, int url) 
{
    ContentValues cv=new ContentValues();

    cv.put("_id",_id);
    cv.put("title_id", title_id);
    cv.put("sub_id", sub_id);
    cv.put("title",title);
    cv.put("url",url);
    long res=this.writeDBTable(cv, "t_rssfeed");

}

public Cursor readDBTable(String table) {
    // TODO Auto-generated method stub
    SQLiteDatabase db=dbhlpr.getReadableDatabase();
    Cursor cr=db.query(table, null, null, null, null, null, null);      
    return cr;
}

public Cursor readMatchingRows(String table,String column1,String column2,String value1,int value2) {
    // TODO Auto-generated method stub
    SQLiteDatabase db=dbhlpr.getReadableDatabase();
    Cursor cr=db.rawQuery("select * from " + table + " where " + column1 + "='" + value1+"' and "+column2+ "="+value2 , null);
    return cr;
}



public long writeDBTable(ContentValues cv,String table)
{
    SQLiteDatabase sdb=dbhlpr.getWritableDatabase();
    long res=sdb.insert(table, null, cv);
    sdb.close();
    return res;
}

public float delete(String table,String colmName,String data) {
    // TODO Auto-generated method stub
    SQLiteDatabase db=dbhlpr.getWritableDatabase();
    String[] arr={data};
    colmName=colmName+"=?";
    float res=db.delete(table, colmName,arr );
    db.close();
    return res;
}


 public void myDBUpdate(String tableName,String keyField,ContentValues cv, String KeyValue) 
{
        String[] col={KeyValue};            
        SQLiteDatabase db=dbhlpr.getWritableDatabase();
        keyField=keyField+"=?";
        long res=db.update(tableName, cv, keyField, col);
        db.close();
}



 }

将数据插入SQLite数据库浏览器

1 个答案:

扩展SQLiteOpenHelper