至于this tutorial我试图设置这个光标并完美地设置它。 但据我所知，它从表中的字符串数组中获取值。
我的表第一列是id，第二列是name。 问题是我希望游标获取每个名称（每个名称都有自己的原始名称），上面的代码是查找列而不是原始列。 目前的结果只是名字。
数据库是：
public class DatBas {
public static final String KEY_ROWID = "_id";
public static final String KEY_SHOURS = "start_hour";
public static final String KEY_SMINUTE = "start_minute";
public static final String KEY_SDATE = "start_date";
public static final String KEY_AMOUNT = "amount";
public static final String KEY_SIDE = "side";
public static final String KEY_KIND = "kind";
public static final String KEY_ROW_b_ID = "_id";
public static final String KEY_b_IMAGE_PATH = "uri_b";
public static final String KEY_b_NAME = "b_name";
public static final String KEY_b_GENDER = "b_gender";
public static final String KEY_b_BORN_DATE_YEAR = "b_age_year";
public static final String KEY_b_BORN_DATE_MONTH = "b_age_month";
public static final String KEY_b_BORN_DATE_DAY = "b_age_day";
private static final String DATABASE_NAME = "TamatDB";
private static final String DATABASE_TABLE = "stop_watch_records";
private static final String DATABASE_TABLE_SETTINGS = "settings";
private static final int DATABASE_VERSION = 3 ;
private TamarDatabase thdb;
private static Context tcontext;
private SQLiteDatabase tdb;
private static class TamarDatabase extends SQLiteOpenHelper {
public TamarDatabase(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String ctData = "CREATE TABLE " + DATABASE_TABLE + " ( "
+ KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ KEY_SHOURS + " TEXT, " + KEY_SMINUTE
+ " TEXT, " + KEY_SDATE + " TEXT, "
+ KEY_AMOUNT + " TEXT, " + KEY_SIDE
+ " TEXT, " + KEY_KIND + " TEXT );";
db.execSQL(ctData);
String ctSettings = "CREATE TABLE " + DATABASE_TABLE_SETTINGS
+ " ( " + KEY_ROW_b_ID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ KEY_b_IMAGE_PATH + " TEXT, " + KEY_b_NAME
+ " TEXT, " + KEY_b_GENDER + " TEXT, "
+ KEY_b_BORN_DATE_YEAR + " TEXT, "
+ KEY_b_BORN_DATE_MONTH + " TEXT, "
+ KEY_b_BORN_DATE_DAY + " TEXT);";
db.execSQL(ctSettings);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE_SETTINGS);
onCreate(db);
}
}
public DatBas(Context c) {
tcontext = c;
}
public DatBas open() throws SQLiteException {
thdb = new TamarDatabase(tcontext);
tdb = thdb.getWritableDatabase();
return this;
}
public SQLiteDatabase getReadableDatabase() throws SQLiteException {
thdb = new TamarDatabase(tcontext);
tdb = thdb.getReadableDatabase();
return tdb;
}
public void close() {
tdb.close();
}
public long createEntry(String sh, String sm, String sd, String at,
String tside, String tkind) {
ContentValues cv = new ContentValues();
cv.put(KEY_SHOURS, sh);
cv.put(KEY_SMINUTE, sm);
cv.put(KEY_SDATE, sd);
cv.put(KEY_AMOUNT, at);
cv.put(KEY_SIDE, tside);
cv.put(KEY_SIDE, tkind);
return tdb.insert(DATABASE_TABLE, null, cv);
}
public long createEntrySettings(String pt, String bn, String bg,
String bbdy, String bbdm, String bbdd) {
ContentValues cv2 = new ContentValues();
cv2.put(KEY_b_IMAGE_PATH, pt);
cv2.put(KEY_b_NAME, bn);
cv2.put(KEY_b_GENDER, bg);
cv2.put(KEY_b_BORN_DATE_YEAR, bbdy);
cv2.put(KEY_b_BORN_DATE_MONTH, bbdm);
cv2.put(KEY_b_BORN_DATE_DAY, bbdd);
return tdb.insert(DATABASE_TABLE_SETTINGS, null, cv2);
}
public String getData() {
String[] columns = new String[] { KEY_ROWID, KEY_SHOURS, KEY_SMINUTE,
KEY_SDATE, KEY_AMOUNT, KEY_SIDE, KEY_KIND };
Cursor c = tdb.query(DATABASE_TABLE, columns, null, null, null, null,
null);
String results = "";
int iRaw = c.getColumnIndex(KEY_ROWID);
int iShours = c.getColumnIndex(KEY_SHOURS);
int iSminute = c.getColumnIndex(KEY_SMINUTE);
int iDate = c.getColumnIndex(KEY_SDATE);
int iAmount = c.getColumnIndex(KEY_AMOUNT);
int iSide = c.getColumnIndex(KEY_SIDE);
int iKind = c.getColumnIndex(KEY_KIND);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
results = results + "the id is " + c.getString(iRaw)
+ " the sart hour is " + " " + c.getString(iShours)
+ " the start minute is " + " " + c.getString(iSminute)
+ " the start date is " + " " + c.getString(iDate)
+ " the amount is " + " " + c.getString(iAmount)
+ " the side is " + " " + c.getString(iSide)
+ " the kind is " + " " + c.getString(iKind) + "\n";
}
return results;
}
public String getDataSettings() {
String[] columns = new String[] { KEY_ROW_b_ID, KEY_b_IMAGE_PATH,
KEY_b_NAME, KEY_b_GENDER, KEY_b_BORN_DATE_YEAR,
KEY_b_BORN_DATE_MONTH, KEY_b_BORN_DATE_DAY };
Cursor c = tdb.query(DATABASE_TABLE_SETTINGS, columns, null, null,
null, null, null);
String results = "";
int iRawbId = c.getColumnIndex(KEY_ROW_b_ID);
int iBIPath = c.getColumnIndex(KEY_b_IMAGE_PATH);
int iBName = c.getColumnIndex(KEY_b_NAME);
int iGender = c.getColumnIndex(KEY_b_GENDER);
int iBBDateYear = c.getColumnIndex(KEY_b_BORN_DATE_YEAR);
int iBBDateMonth = c.getColumnIndex(KEY_b_BORN_DATE_MONTH);
int iBBDateDay = c.getColumnIndex(KEY_b_BORN_DATE_DAY);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
results = results + " id " + " " + c.getString(iRawbId)
+ " path " + " " + c.getString(iBIPath)
+ " name " + " " + c.getString(iBName)
+ " gender " + " " + c.getString(iGender)
+ " year " + " " + c.getString(iBBDateYear)
+ " month " + " " + c.getString(iBBDateMonth)
+ " day " + " " + c.getString(iBBDateDay) + "\n";
}
return results;
}
public String getDataSettingsbName() {
String[] columns = new String[] { KEY_ROW_b_ID, KEY_b_NAME };
Cursor c = tdb.query(DATABASE_TABLE_SETTINGS, columns, null, null,
null, null, null);
String results = "";
int iRawbId = c.getColumnIndex(KEY_ROW_b_ID);
int iBName = c.getColumnIndex(KEY_b_NAME);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
results = c.getString(iRawbId)+ c.getString(iBName)+ "\n";
}
return results;
}
public DatBas delete() {
tdb.delete(DATABASE_TABLE, null, null);
tdb.delete(DATABASE_TABLE_SETTINGS, null, null);
return null;
}
public static class TamarDatabaseCursor extends SQLiteCursor {
/** The query for this cursor */
private static final String QUERY = "SELECT _id, b_name FROM settings";
/** Cursor constructor */
private TamarDatabaseCursor(SQLiteDatabase db,
SQLiteCursorDriver driver, String editTable, SQLiteQuery query) {
super(db, driver, editTable, query);
}
/** Private factory class necessary for rawQueryWithFactory() call */
private static class Factory implements SQLiteDatabase.CursorFactory {
public Cursor newCursor(SQLiteDatabase db,
SQLiteCursorDriver driver, String editTable,
SQLiteQuery query) {
return new TamarDatabaseCursor(db, driver, editTable, query);
}
}
/* Accessor functions get one per database column */
public int getActressId() {
return getInt(getColumnIndexOrThrow("settings._id"));
}
}
public TamarDatabaseCursor getActress() {
SQLiteDatabase d = getReadableDatabase();
TamarDatabaseCursor c = (TamarDatabaseCursor) d.rawQueryWithFactory(
new TamarDatabaseCursor.Factory(), TamarDatabaseCursor.QUERY,
null, null);
c.moveToFirst();
return c;
}
}
活动是：
DatBas db = new DatBas(Tamar_appActivity.this);
TamarDatabaseCursor c = db.getActress();
if (c.moveToFirst())
DisplayRadioButton(c);
else
Toast.makeText(this, "No title found", Toast.LENGTH_LONG).show();
db.close();
}
public void DisplayRadioButton(Cursor c) {
for (int i = 1; i < (c.getColumnCount()); i++) {
RadioGroup radiogroup = (RadioGroup) findViewById(R.id.bNameSelectGroup);
RadioButton rdbtn = new RadioButton(this);
rdbtn.setId(i);
rdbtn.setText(c.getString(i));
radiogroup.addView(rdbtn);
}
}
答案 0 :(得分：0)
你不明白游标和查询是如何工作的。
您查询数据库并告诉它从数据库中符合特定条件的某些列返回信息。数据库以游标的形式向您发送数据，该游标包含您按照指定的顺序从与请求匹配的所有行中指定的所有列中的信息。
SELECT _id, firstname, lastname FROM actresses
以上内容将返回数据库中每行的_id，firstname lastname列中的数据。
所以，如果你有三位女演员，它会返回三条记录，信息来自你指定的三列。
SELECT _id, firstname FROM actresses
这个只返回每条记录的_id和firstname列中的信息。
修改
您只能获得该名称，因为这是您进行查询时所要求的全部内容：
private static final String QUERY = "SELECT _id, b_name FROM settings
更改它以返回更多列，您将获得更多单选按钮。