Question

我使用Firefox SQLite Manager创建并填充了一个SQLite数据库。我将.sqlite文件复制到Android项目的assets文件夹中。

我的目标是使用此记录来填充微调器。当我查询数据库时，光标显示列但没有记录。

我的DatabaseHandler课程扩展了SQLiteOpenHelper，其中包含onCreate，onUpgrade和getAllOffices的方法。

public List<String> getAllOffices(){ 
    List<String> offices = new ArrayList<String>(); 

    // Select All Query 
    String selectQuery = "SELECT OfficeId as _id, OfficeName FROM " + TABLE_OFFICE; 

    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor cursor = db.rawQuery(selectQuery, null); 

    // looping through all rows and adding to list 
    if (cursor.moveToFirst()) { 
        do { 
            offices.add(cursor.getString(1)); 
        } while (cursor.moveToNext()); 
    } 

    // closing connection 
    cursor.close(); 
    db.close(); 

    // returning offices 
    return offices; 
}

有关记录未归还的任何想法将不胜感激。

Answer 1

试试这个：

public List<String> getAllOffices(){ 
    List<String> offices = new ArrayList<String>(); 

    // Select All Query 
    String selectQuery = "SELECT OfficeId as _id, OfficeName FROM " + TABLE_OFFICE; 

    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor cursor = db.rawQuery(selectQuery, null); 

    // looping through all rows and adding to list 
    if (cursor.moveToFirst()) { 
        do { 
            offices.add(cursor.getString(cursor.getColumnIndex("_id"))); 
        } while (cursor.moveToNext()); 
    } 

    // closing connection 
    cursor.close(); 
    db.close(); 

    // returning offices 
    return offices; 
}

基本上它只会确保您使用正确的列索引。否则，如果您正在使用eclipse，请尝试使用cellobject插件浏览数据库，并确保按预期填充表： http://marketplace.eclipse.org/content/cellobject-sqlite-xml-browser#.UWOU5RaBD3g

Answer 2

请尝试这一点，可能对您有用。

public List<String> getAllOffices(){ 
    List<String> offices = new ArrayList<String>(); 

    // Select All Query 
    String selectQuery = "SELECT * FROM " + TABLE_OFFICE; 

    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor cursor = db.rawQuery(selectQuery, null); 
    System.out.println("CURSOR SIZE:"+cursor.getCount())
    // looping through all rows and adding to list 
    if(cursor.getCount()!=0){
        if (cursor.moveToFirst()) { 
            do { 
                System.out.println(cursor.getString(c.getColumnIndex("as per your db column name"));
            } while (cursor.moveToNext()); 
        }
    }   

    // closing connection 
    cursor.close(); 
    db.close(); 

    // returning offices 
    return offices; 
}

首先，如果你做得对，你必须看到控制台输出然后添加到你的office bean

Android：SQLite数据库查询不返回任何记录

2 个答案: