Question

有没有办法读取sqlite表中的所有行并在textview中一次显示它们？这就是我读它们的方式，它逐行阅读....

//---retrieves all the titles---
    public Cursor getAllTitles() 
    {
        return db.query(DATABASE_TABLE, new String[] {
                KEY_ROWID, 
                KEY_ISBN,
                KEY_TITLE,
                KEY_PUBLISHER}, 
                null, 
                null, 
                null, 
                null, 
                null);

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.widget.Toast;

public class DatabaseActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        DBAdapter db = new DBAdapter(this);

        //---get all titles---
        db.open();
        Cursor c = db.getAllTitles();
        if (c.moveToFirst())
        {
            do {          
                DisplayTitle(c);
            } while (c.moveToNext());
        }
        db.close();
    }    
}

 public void DisplayTitle(Cursor c)
    {
        Toast.makeText(this, 
                "id: " + c.getString(0) + "\n" +
                "ISBN: " + c.getString(1) + "\n" +
                "TITLE: " + c.getString(2) + "\n" +
                "PUBLISHER:  " + c.getString(3),
                Toast.LENGTH_LONG).show();        
    }

Answer 1

首先，您可能需要查看列表视图以轻松显示此类数据列表。

如果您的目标确实是在一个文本视图中显示所有信息（或者正在制作吐司），您可以尝试制作一个大字符串，用它来创建吐司：

    //---get all titles---
    db.open();
    Cursor c = db.getAllTitles();
    String text = "";
    if (c.moveToFirst())
    {
        do {          
            DisplayTitle(c, text);
        } while (c.moveToNext());
    }
    db.close();
    Toast.makeText(this, text, Toast.LENGTH_LONG).show(); 
}

public void DisplayTitle(Cursor c, String text)
{
    text +=
            "id: " + c.getString(0) + "\n" +
            "ISBN: " + c.getString(1) + "\n" +
            "TITLE: " + c.getString(2) + "\n" +
            "PUBLISHER:  " + c.getString(3);        
}

Answer 2

db.getReadableDatabase();
StringBuffer sb=new StringBuffer();
Cursor c=db.rawQuery(SELECT * FROM TABLE_NAME);
while(c.moveToNext){
sb.append(c.getString(0);//c.getString(Column Index)
sb.append(c.getString(1);
//getString( till n number of Columns you have )
}
textView.setText(sb);

android sqlite一次读取所有行

2 个答案: