如何删除表中的所有内容sql

我试图弄清楚如何删除整个表上的一个按钮的单击，所以可以说我有一个名为Delete的按钮我想按下它并删除表中的所有内容。
我试过，但它没有工作，我没有KNO wwhat把在按钮如何删除表中的所有内容sql

void deleteAll() 
{ 
    SQLiteDatabase db= ourHelper.getWritableDatabase(); 
    db.delete(DATABASE_TABLE, null, null); 
}

代码：

package f.s.l; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.SQLException; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteDatabase.CursorFactory; 
import android.database.sqlite.SQLiteOpenHelper; 

public class HotOrNot { 
public static final String KEY_ROWID ="_id"; 
public static final String KEY_NAME ="persons_name"; 
public static final String KEY_HOTNESS ="persons_hotness"; 

private static final String DATABASE_NAME ="HotOrNotdb"; 
private static final String DATABASE_TABLE ="peopleTable"; 
private static final int DATABASE_VERSION =1; 

private DbHelper ourHelper; 
private final Context ourContext; 
private SQLiteDatabase ourDatabase; 

private static class DbHelper extends SQLiteOpenHelper{ 

public DbHelper(Context context) { 
    super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    // TODO Auto-generated constructor stub 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    // TODO Auto-generated method stub 
    db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + 
     KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
     KEY_NAME + " TEXT NOT NULL, " + 
     KEY_HOTNESS + " TEXT NOT NULL);" 
    ); 
} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    // TODO Auto-generated method stub 
    db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE); 
    onCreate(db); 
} 
} 

public HotOrNot(Context c){ 
    ourContext =c; 
} 

public HotOrNot open() throws SQLException { 
    ourHelper = new DbHelper(ourContext); 
    ourDatabase = ourHelper.getWritableDatabase(); 
    return this; 
} 

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

public long createEntry(String name, String hotness) { 
    // TODO Auto-generated method stub 
    ContentValues cv = new ContentValues(); 
    cv.put(KEY_NAME, name); 
    cv.put(KEY_HOTNESS, hotness); 
    return ourDatabase.insert(DATABASE_TABLE, null, cv); 
} 

public String getData() { 
    // TODO Auto-generated method stub 
    String [] columns = new String[]{ KEY_ROWID, KEY_NAME, KEY_HOTNESS}; 
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null); 
    String result = ""; 

    int iRow = c.getColumnIndex(KEY_ROWID); 
    int iName = c.getColumnIndex(KEY_NAME); 
    int iHotness = c.getColumnIndex(KEY_HOTNESS); 

    for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { 
     result = result + c.getString(iRow) + " "+ c.getString(iName) + " " + c.getString(iHotness) + "\n"; 
} 

return result; 
} 

}

来源

2012-04-28 Hashey100

请发布您的logcat错误。 – Sam 2012-04-29 00:07:32

你可以只是做

db.execSQL("DELETE * FROM " + DATABASE_TABLE);

这将不会删除表，但会删除表中的所有行。

来源

2012-04-29 00:30:47 mmoon

'删除表名;'应该是正确的。在[DELETE]（http://www.sqlite.org/lang_delete.html）中没有'*' – zapl 2012-04-29 02:06:03

尝试使用drop table命令，我认为它必须是drop table

来源

2012-04-29 03:53:39 girimajiananth

如何删除表中的所有内容sql

回答

相关问题