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我在Android中創建了一個簡單的數據庫。它有3列RowID,UPCCode和Title。我已經成功使用YouTube上的NewBoston教程將數據輸入數據庫。現在,我要的是限制我的數據庫10個記錄(例如最近10個搜索),我想顯示他們到一個新的活動一個ListView。限制條目(無,行),並檢索記錄創建一個ListView
我有關於如何實現的問題,不能找到很好的幫助..下面貼的代碼...
TenSearches.java
package com.rhuf.brandscan;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
public class TenSearches {
public static final String KEY_ROWID="ID";
public static final String KEY_UPC="upccode";
public static final String KEY_TITLE="title";
public static final String DATABASE_NAME="BrandscanDB";
public static final String DATABASE_TABLE="ScanTable";
public static final int DATABASE_VERSION=1;
private DBHelper helper;
private final Context context;
private SQLiteDatabase BrandScanDB;
public TenSearches(Context c)
{
context = c;
}
public TenSearches open() throws SQLException
{
helper = new DBHelper(context);
BrandScanDB = helper.getWritableDatabase();
return this;
}
public void close()
{
helper.close();
}
public long createEntry(String upc, String title)
{
ContentValues cv = new ContentValues();
cv.put(KEY_UPC, upc);
cv.put(KEY_TITLE, title);
return BrandScanDB.insert(DATABASE_TABLE, null, cv);
}
public String getDataUPC()
{
String columns[]=new String[]{KEY_ROWID,KEY_UPC,KEY_TITLE};
Cursor c = BrandScanDB.query(DATABASE_TABLE, columns, null, null, null, null, KEY_ROWID);
String result;
int iRow = c.getColumnIndex(KEY_ROWID);
int iUPC = c.getColumnIndex(KEY_UPC);
int iTitle = c.getColumnIndex(KEY_TITLE);
//Make a listArray or Object Array from the Database entries
return null;
}
}
DBHelper.java
package com.rhuf.brandscan;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import com.rhuf.brandscan.TenSearches;
public class DBHelper extends SQLiteOpenHelper{
public DBHelper(Context context) {
super(context,TenSearches.DATABASE_NAME,null,TenSearches.DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE " +TenSearches.DATABASE_TABLE +" ("+
TenSearches.KEY_ROWID +" INTEGER PRIMARY KEY AUTOINCREMENT, " +
TenSearches.KEY_UPC +" TEXT NOT NULL, " +
TenSearches.KEY_TITLE + " TEXT NOT NULL);");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + TenSearches.DATABASE_TABLE);
onCreate(db);
}
}
確定我沒有完全讀它,讓我來試試您的解決方案,希望我能夠做得出來 – 2012-04-13 09:43:37
我能大部分工作了,仍然無法創建序列化文件:■但由於:d – 2012-04-13 18:47:33