我正在尝试将从数据库（extends sqliteOpenHelper）内部获取的一些值传递给另一个类。但是我使用游标从该数据库获取数据，该数据为其他活动提供空值。
这是我的数据库： 它里面有默认值，插入
public class DatabaseMaster extends SQLiteOpenHelper {
SQLiteDatabase db;
private static final String LOG = "DatabaseHelper";
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "Rates";
// Table Names
public static final String KEY_ER_ID = "er_id";
public static final String KEY_ER_USEDORNEW = "Used_or_New";
public static final String KEY_ER_TENOR = "ER_tenor";
public static final String KEY_ER_RATE = "ER_rate";
// Asuransi rate
public static final String KEY_AS_ID = "as_id";
public static final String KEY_AS_REGIONAL = "regional";
public static final String KEY_AS_TENOR = "AS_tenor";
public static final String KEY_AS_TLO = "TLO";
public static final String KEY_AS_COMPREHENSIVE = "Comprehensive";
public static final String KEY_AS_COMBINE = "Combine";
public static final String TABLE_EFFECTIVE_RATE = "effective_rate";
public static final String TABLE_ASURANSI_RATE = "asuransi_rate";
public DatabaseMaster(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
try {
db.beginTransaction();
db.execSQL("CREATE TABLE " + TABLE_EFFECTIVE_RATE + " ("
+ KEY_ER_ID + " INTEGER PRIMARY KEY, " + KEY_ER_USEDORNEW
+ " TEXT NOT NULL, " + KEY_ER_TENOR + " INTEGER,"
+ KEY_ER_RATE + " REAL)");
db.execSQL("CREATE TABLE " + TABLE_ASURANSI_RATE + " (" + KEY_AS_ID
+ " INTEGER PRIMARY KEY, " + KEY_AS_REGIONAL + " INTEGER, "
+ KEY_AS_TENOR + " INTEGER," + KEY_AS_TLO + " REAL,"
+ KEY_AS_COMPREHENSIVE + " REAL," + KEY_AS_COMBINE
+ " REAL)");
// Inserts pre-defined departments
InsertERs(db);
insertASs(db);
db.setTransactionSuccessful();
} finally {
db.endTransaction();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + TABLE_EFFECTIVE_RATE);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_ASURANSI_RATE);
// db.execSQL("DROP TRIGGER IF EXISTS er_id_trigger");
// db.execSQL("DROP TRIGGER IF EXISTS er_id_trigger22");
// db.execSQL("DROP TRIGGER IF EXISTS as_id_trigger");
// db.execSQL("DROP TRIGGER IF EXISTS as_id_trigger22");
onCreate(db);
}
void AddERrate(EntryEffectiveRate EER) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues valuesER = new ContentValues();
valuesER.put(KEY_ER_ID, EER.getERId());
valuesER.put(KEY_ER_USEDORNEW, EER.getERKondisi());
valuesER.put(KEY_ER_TENOR, EER.getERTenor());
valuesER.put(KEY_ER_RATE, EER.getERrate());
// values.put(KEY_CREATED_AT, getDateTime());
// insert row
// long er_id =
db.insert(TABLE_EFFECTIVE_RATE, null, valuesER);
// db.close();
// return er_id;
}
int getERCount() {
SQLiteDatabase db = this.getWritableDatabase();
Cursor cur = db.rawQuery("Select * from " + TABLE_EFFECTIVE_RATE, null);
int x = cur.getCount();
cur.close();
return x;
}
Cursor getAllERates() {
SQLiteDatabase db = this.getWritableDatabase();
// Cursor cur=
// db.rawQuery("Select "+colID+" as _id , "+colName+", "+colAge+" from "+employeeTable,
// new String [] {});
// Cursor cur= db.rawQuery("SELECT * FROM "+viewEmps,null);
Cursor cur = db.rawQuery("Select " + KEY_ER_ID + " as _id, "
+ KEY_ER_USEDORNEW + ", " + KEY_ER_TENOR + ", " + KEY_ER_RATE
+ ", " + " from " + TABLE_EFFECTIVE_RATE, new String[] {});
cur.close();
return cur;
}
public List<EntryEffectiveRate> getAllEffectiveRates() {
List<EntryEffectiveRate> EffectiveRates = new ArrayList<EntryEffectiveRate>();
String selectQuery = "SELECT * FROM " + TABLE_EFFECTIVE_RATE;
Log.e(LOG, selectQuery);
SQLiteDatabase db = this.getReadableDatabase();
Cursor c = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (c.moveToFirst()) {
do {
EntryEffectiveRate ergt = new EntryEffectiveRate();
ergt.setERId(c.getInt(c.getColumnIndex(KEY_ER_ID)));
ergt.setERKondisi(c.getString(c
.getColumnIndex(KEY_ER_USEDORNEW)));
ergt.setERTenor(c.getInt(c.getColumnIndex(KEY_ER_TENOR)));
ergt.setERRate(c.getDouble(c.getColumnIndex(KEY_ER_RATE)));
// add
EffectiveRates.add(ergt);
} while (c.moveToNext());
}
// db.close();
c.close();
return EffectiveRates;
}
public int updateEntryEffectiveRate(EntryEffectiveRate er) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_ER_ID, er.getERId());
values.put(KEY_ER_USEDORNEW, er.getERKondisi());
values.put(KEY_ER_TENOR, er.getERTenor());
values.put(KEY_ER_RATE, er.getERrate());
// values.put(KEY_CREATED_AT, getDateTime());
// updating row
return db.update(TABLE_EFFECTIVE_RATE, values, KEY_ER_ID + " = ?",
new String[] { String.valueOf(er.getERId()) });
}
//
public void deleteEntryEffectiveRate(long er_id) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_EFFECTIVE_RATE, KEY_ER_ID + " = ?",
new String[] { String.valueOf(er_id) });
}
void AddASrate(EntryAsuransiRate EAR) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues valuesAS = new ContentValues();
valuesAS.put(KEY_AS_ID, EAR.getASId());
valuesAS.put(KEY_AS_REGIONAL, EAR.getASzona());
valuesAS.put(KEY_AS_TENOR, EAR.getAStenor());
valuesAS.put(KEY_AS_TLO, EAR.getAStlo());
valuesAS.put(KEY_AS_COMPREHENSIVE, EAR.getAScomp());
valuesAS.put(KEY_AS_COMBINE, EAR.getAScomb());
// values.put(KEY_CREATED_AT, getDateTime());
// insert row
// long er_id =
db.insert(TABLE_ASURANSI_RATE, null, valuesAS);
// db.close();
// return er_id;
}
Cursor getAllASrates() {
SQLiteDatabase db = this.getWritableDatabase();
Cursor cur = db.rawQuery("Select " + KEY_AS_ID + " as _id, "
+ KEY_AS_REGIONAL + ", " + KEY_AS_TENOR + ", " + KEY_AS_TLO
+ ", " + KEY_AS_COMPREHENSIVE + ", " + KEY_AS_COMBINE + ", "
+ " from " + TABLE_ASURANSI_RATE, new String[] {});
cur.close();
return cur;
}
int getASCount() {
SQLiteDatabase db = this.getWritableDatabase();
Cursor cur = db.rawQuery("Select * from " + TABLE_ASURANSI_RATE, null);
int x = cur.getCount();
cur.close();
return x;
}
public List<EntryAsuransiRate> getAllAsuransiRates() {
List<EntryAsuransiRate> AsuransiRates = new ArrayList<EntryAsuransiRate>();
String selectQuery = "SELECT * FROM " + TABLE_ASURANSI_RATE;
Log.e(LOG, selectQuery);
SQLiteDatabase db = this.getReadableDatabase();
Cursor c = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (c.moveToFirst()) {
do {
EntryAsuransiRate asgt = new EntryAsuransiRate();
asgt.setASId(c.getInt(c.getColumnIndex(KEY_AS_ID)));
asgt.setASzona(c.getInt(c.getColumnIndex(KEY_AS_REGIONAL)));
asgt.setAStenor(c.getInt(c.getColumnIndex(KEY_AS_TENOR)));
asgt.setAStlo(c.getDouble(c.getColumnIndex(KEY_AS_TLO)));
asgt.setAScomp(c.getDouble(c
.getColumnIndex(KEY_AS_COMPREHENSIVE)));
asgt.setAScomb(c.getDouble(c.getColumnIndex(KEY_AS_COMBINE)));
// add
AsuransiRates.add(asgt);
} while (c.moveToNext());
}
// db.close();
c.close();
return AsuransiRates;
}
public int updateEntryAsuransiRate(EntryAsuransiRate EAR) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues valuesAS = new ContentValues();
valuesAS.put(KEY_AS_ID, EAR.getASId());
valuesAS.put(KEY_AS_REGIONAL, EAR.getASzona());
valuesAS.put(KEY_AS_TENOR, EAR.getAStenor());
valuesAS.put(KEY_AS_TLO, EAR.getAStlo());
valuesAS.put(KEY_AS_COMPREHENSIVE, EAR.getAScomp());
valuesAS.put(KEY_AS_COMBINE, EAR.getAScomb());
// values.put(KEY_CREATED_AT, getDateTime());
// updating row
return db.update(TABLE_ASURANSI_RATE, valuesAS, KEY_AS_ID + " = ?",
new String[] { String.valueOf(EAR.getASId()) });
}
//
public void deleteEntryAsuransiRate(long as_id) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_ASURANSI_RATE, KEY_AS_ID + " = ?",
new String[] { String.valueOf(as_id) });
}
void InsertERs(SQLiteDatabase db) {
try {
db.beginTransaction();
ContentValues cv = new ContentValues();
cv.put(KEY_ER_ID, 1);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 12);
cv.put(KEY_ER_RATE, 12.1);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
cv.put(KEY_ER_ID, 2);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 24);
cv.put(KEY_ER_RATE, 12.2);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
cv.put(KEY_ER_ID, 3);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 36);
cv.put(KEY_ER_RATE, 12.3);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
cv.put(KEY_ER_ID, 4);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 48);
cv.put(KEY_ER_RATE, 12.4);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
cv.put(KEY_ER_ID, 5);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 60);
cv.put(KEY_ER_RATE, 12.5);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
cv.put(KEY_ER_ID, 6);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 12);
cv.put(KEY_ER_RATE, 12.6);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
cv.put(KEY_ER_ID, 7);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 24);
cv.put(KEY_ER_RATE, 12.7);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
cv.put(KEY_ER_ID, 8);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 36);
cv.put(KEY_ER_RATE, 12.8);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
cv.put(KEY_ER_ID, 9);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 48);
cv.put(KEY_ER_RATE, 12.9);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
cv.put(KEY_ER_ID, 10);
cv.put(KEY_ER_USEDORNEW, "Baru");
cv.put(KEY_ER_TENOR, 60);
cv.put(KEY_ER_RATE, 13);
db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
// db.insert(TABLE_EFFECTIVE_RATE, KEY_ER_ID, cv);
db.setTransactionSuccessful();
} finally {
db.endTransaction();
}
// db.close();
}
void insertASs(SQLiteDatabase db) {
try {
db.beginTransaction();
ContentValues cv = new ContentValues();
cv.put(KEY_AS_ID, 1);
cv.put(KEY_AS_REGIONAL, 1);
cv.put(KEY_AS_TENOR, 12);
cv.put(KEY_AS_TLO, 1.00);
cv.put(KEY_AS_COMPREHENSIVE, 2.00);
cv.put(KEY_AS_COMBINE, 3.00);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 2);
cv.put(KEY_AS_REGIONAL, 1);
cv.put(KEY_AS_TENOR, 24);
cv.put(KEY_AS_TLO, 1.01);
cv.put(KEY_AS_COMPREHENSIVE, 2.01);
cv.put(KEY_AS_COMBINE, 3.01);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 3);
cv.put(KEY_AS_REGIONAL, 1);
cv.put(KEY_AS_TENOR, 36);
cv.put(KEY_AS_TLO, 1.02);
cv.put(KEY_AS_COMPREHENSIVE, 2.02);
cv.put(KEY_AS_COMBINE, 3.02);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 4);
cv.put(KEY_AS_REGIONAL, 1);
cv.put(KEY_AS_TENOR, 48);
cv.put(KEY_AS_TLO, 1.03);
cv.put(KEY_AS_COMPREHENSIVE, 2.03);
cv.put(KEY_AS_COMBINE, 3.03);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 5);
cv.put(KEY_AS_REGIONAL, 1);
cv.put(KEY_AS_TENOR, 60);
cv.put(KEY_AS_TLO, 1.04);
cv.put(KEY_AS_COMPREHENSIVE, 2.04);
cv.put(KEY_AS_COMBINE, 3.04);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 6);
cv.put(KEY_AS_REGIONAL, 2);
cv.put(KEY_AS_TENOR, 12);
cv.put(KEY_AS_TLO, 1.05);
cv.put(KEY_AS_COMPREHENSIVE, 2.05);
cv.put(KEY_AS_COMBINE, 3.05);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 7);
cv.put(KEY_AS_REGIONAL, 2);
cv.put(KEY_AS_TENOR, 24);
cv.put(KEY_AS_TLO, 1.06);
cv.put(KEY_AS_COMPREHENSIVE, 2.06);
cv.put(KEY_AS_COMBINE, 3.06);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 8);
cv.put(KEY_AS_REGIONAL, 2);
cv.put(KEY_AS_TENOR, 36);
cv.put(KEY_AS_TLO, 1.07);
cv.put(KEY_AS_COMPREHENSIVE, 2.07);
cv.put(KEY_AS_COMBINE, 3.07);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 9);
cv.put(KEY_AS_REGIONAL, 2);
cv.put(KEY_AS_TENOR, 48);
cv.put(KEY_AS_TLO, 1.08);
cv.put(KEY_AS_COMPREHENSIVE, 2.08);
cv.put(KEY_AS_COMBINE, 3.08);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 10);
cv.put(KEY_AS_REGIONAL, 2);
cv.put(KEY_AS_TENOR, 60);
cv.put(KEY_AS_TLO, 1.09);
cv.put(KEY_AS_COMPREHENSIVE, 2.09);
cv.put(KEY_AS_COMBINE, 3.09);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 11);
cv.put(KEY_AS_REGIONAL, 3);
cv.put(KEY_AS_TENOR, 12);
cv.put(KEY_AS_TLO, 1.10);
cv.put(KEY_AS_COMPREHENSIVE, 2.10);
cv.put(KEY_AS_COMBINE, 3.10);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 12);
cv.put(KEY_AS_REGIONAL, 3);
cv.put(KEY_AS_TENOR, 24);
cv.put(KEY_AS_TLO, 1.11);
cv.put(KEY_AS_COMPREHENSIVE, 2.11);
cv.put(KEY_AS_COMBINE, 3.11);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 13);
cv.put(KEY_AS_REGIONAL, 3);
cv.put(KEY_AS_TENOR, 36);
cv.put(KEY_AS_TLO, 1.12);
cv.put(KEY_AS_COMPREHENSIVE, 2.12);
cv.put(KEY_AS_COMBINE, 3.12);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 14);
cv.put(KEY_AS_REGIONAL, 3);
cv.put(KEY_AS_TENOR, 48);
cv.put(KEY_AS_TLO, 1.13);
cv.put(KEY_AS_COMPREHENSIVE, 2.13);
cv.put(KEY_AS_COMBINE, 3.13);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
cv.put(KEY_AS_ID, 15);
cv.put(KEY_AS_REGIONAL, 3);
cv.put(KEY_AS_TENOR, 60);
cv.put(KEY_AS_TLO, 1.14);
cv.put(KEY_AS_COMPREHENSIVE, 2.14);
cv.put(KEY_AS_COMBINE, 3.14);
db.insert(TABLE_ASURANSI_RATE, KEY_AS_ID, cv);
db.setTransactionSuccessful();
} finally {
db.endTransaction();
}
// db1.close();
}
public Cursor getERValues(int index) {
String from[] = { "KEY_ER_USEDORNEW", "KEY_ER_TENOR", "KEY_ER_RATE" };
String where = DatabaseMaster.KEY_ER_ID + "=?";
String[] whereArgs = new String[] { index + "" };
Cursor cursor = db.query(DatabaseMaster.TABLE_EFFECTIVE_RATE, from,
where, whereArgs, null, null, null, null);
return cursor;
}
class DataHandler extends Activity {
public void getData(int id) {
Cursor c = getERValues(id);
if (c != null) {
while (c.moveToNext()) {
String UorN = c.getString(c.getColumnIndex("Used_or_New"));
int er_t = c.getInt(c.getColumnIndex("ER_tenor"));
double er_r = c.getDouble(c.getColumnIndex("ER_rate"));
// use these strings as you want
Intent Person = new Intent(this, MediatorMaster.class);
Person.putExtra("Used_or_New", UorN);
Person.putExtra("ER_tenor", er_t);
Person.putExtra("ER_rate", er_r);
startActivity(Person);
}
}
}
}
// closing database
public void closeDB() {
SQLiteDatabase db = this.getReadableDatabase();
if (db != null && db.isOpen())
db.close();
}
@Override
public void onOpen(SQLiteDatabase db) {
super.onOpen(db);
if (!db.isReadOnly()) {
// Enable foreign key constraints
db.execSQL("PRAGMA foreign_keys=ON;");
}
}
}
另一个假设显示通过意图发送的数据：
public class MediatorMaster extends Activity {
@Override
protected void onCreate(Bundle unpack) {
// TODO Auto-generated method stub
super.onCreate(unpack);
setContentView(R.layout.test);
unpack = getIntent().getExtras();
//for(){
if (unpack != null) {
String UorN = unpack.getString("Used_or_New");
//int er_t = unpack.getInt("er_t");
//double er_r = unpack.getDouble("er_r");
Message.message(this, "Result :"+ UorN + " " /*+ er_t + " " + er_r*/);
}
else {
Message.message(this, "unread datas");
}
// }
}
}
编辑： 我有另一个类，将显示多少条目，并将显示所有数据。我创建了这个以确保数据是否真的存在。
将显示的课程：
public class MainActivity extends Activity {
// Database Helper
DatabaseMaster db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// SQLiteDatabase db = this.getReadaleDatabase();
//db = new DatabaseHelper(getApplicationContext());
db = new DatabaseMaster(getApplicationContext());
Log.d("Effectiverate Count", " EffectiverateCount: "
+ db.getASCount());
Log.d("Asuransirate Count", " AsuransirateCount: "
+ db.getERCount());
// getting all ER
Log.d("Get ER", "GEtting All ER");
List<EntryEffectiveRate> allEffectiveRate = db.getAllEffectiveRates();
for (EntryEffectiveRate ER : allEffectiveRate) {
Log.d("ER_ids", String.valueOf(ER.getERId()));
Log.d("ER_rates", ER.getERKondisi());
Log.d("ER_tenors", String.valueOf(ER.getERTenor()));
Log.d("ER_rates", String.valueOf(ER.getERrate()));
}
// getting all AS
Log.d("Get AS", "GEtting All AS");
List<EntryAsuransiRate> allAsuransiRate = db.getAllAsuransiRates();
for (EntryAsuransiRate AS : allAsuransiRate) {
Log.d("AS_ids", String.valueOf(AS.getASId()));
Log.d("AS_tenors", String.valueOf(AS.getAStenor()));
Log.d("AS_tlos", String.valueOf(AS.getAStlo()));
Log.d("AS_comps", String.valueOf(AS.getAScomp()));
Log.d("AS_combs", String.valueOf(AS.getAScomb()));
}
// Don't forget to close database connection
db.closeDB();
}}
其他将成为构造函数的类，定义输入的参数：
public class EntryAsuransiRate {
int as_id;
int ASzona;
int AStenor;
double AStlo;
double AScomp;
double AScomb;
// String created_at;
// constructors
public EntryAsuransiRate() {
}
public EntryAsuransiRate(int ASzona, int AStenor, double AStlo,
double AScomp, double AScomb) {
this.ASzona = ASzona;
this.AStenor = AStenor;
this.AStlo = AStlo;
this.AScomp = AScomp;
this.AScomb = AScomb;
}
public EntryAsuransiRate(int as_id, int ASzona, int AStenor, double AStlo,
double AScomp, double AScomb) {
this.as_id = as_id;
this.ASzona = ASzona;
this.AStenor = AStenor;
this.AStlo = AStlo;
this.AScomp = AScomp;
this.AScomb = AScomb;
}
// setters
public void setASId(int as_id) {
this.as_id = as_id;
}
public void setASzona(int ASzona) {
this.ASzona = ASzona;
}
public void setAStenor(int AStenor) {
this.AStenor = AStenor;
}
public void setAStlo(double AStlo) {
this.AStlo = AStlo;
}
public void setAScomp(double AScomp) {
this.AScomp = AScomp;
}
public void setAScomb(double AScomb) {
this.AScomb = AScomb;
}
// public void setCreatedAt(String created_at){
// this.created_at = created_at;
// }
// getters
public long getASId() {
return this.as_id;
}
public int getASzona() {
return this.ASzona;
}
public int getAStenor() {
return this.AStenor;
}
public double getAStlo() {
return this.AStlo;
}
public double getAScomp() {
return this.AScomp;
}
public double getAScomb() {
return this.AScomb;
}
}
and
public class EntryEffectiveRate {
int er_id;
String ERkondisi;
int ERtenor;
double ERrate;
//String created_at;
// constructors
public EntryEffectiveRate() {
}
public EntryEffectiveRate(String ERkondisi, int ERtenor, double ERrate) {
this.ERkondisi = ERkondisi;
this.ERtenor = ERtenor;
this.ERrate = ERrate;
}
public EntryEffectiveRate(int er_id, String ERkondisi, int ERtenor, double ERrate) {
this.er_id = er_id;
this.ERkondisi = ERkondisi;
this.ERtenor = ERtenor;
this.ERrate = ERrate;
}
// setters
public void setERId(int er_id) {
this.er_id = er_id;
}
public void setERKondisi(String ERkondisi) {
this.ERkondisi = ERkondisi;
}
public void setERTenor(int ERtenor) {
this.ERtenor = ERtenor;
}
public void setERRate(double ERrate){
this.ERrate = ERrate;
}
//public void setCreatedAt(String created_at){
// this.created_at = created_at;
//}
// getters
public long getERId() {
return this.er_id;
}
public String getERKondisi() {
return this.ERkondisi;
}
public int getERTenor() {
return this.ERtenor;
}
public double getERrate(){
return this.ERrate;
}
}
执行/运行mainactivity时的logcat结果
04-07 14:35:11.827: D/Effectiverate Count(395): EffectiverateCount: 15
04-07 14:35:11.837: D/Asuransirate Count(395): AsuransirateCount: 10
04-07 14:35:11.837: D/Get ER(395): GEtting All ER
04-07 14:35:11.837: E/DatabaseHelper(395): SELECT * FROM effective_rate
04-07 14:35:11.847: D/ER_ids(395): 1
04-07 14:35:11.867: D/ER_rates(395): Baru
04-07 14:35:11.867: D/ER_tenors(395): 12
04-07 14:35:11.890: D/ER_rates(395): 12.1
04-07 14:35:11.890: D/ER_ids(395): 2
04-07 14:35:11.890: D/ER_rates(395): Baru
04-07 14:35:11.890: D/ER_tenors(395): 24
04-07 14:35:11.890: D/ER_rates(395): 12.2
04-07 14:35:11.890: D/ER_ids(395): 3
04-07 14:35:11.890: D/ER_rates(395): Baru
04-07 14:35:11.890: D/ER_tenors(395): 36
04-07 14:35:11.890: D/ER_rates(395): 12.3
04-07 14:35:11.897: D/ER_ids(395): 4
04-07 14:35:11.897: D/ER_rates(395): Baru
04-07 14:35:11.897: D/ER_tenors(395): 48
04-07 14:35:11.897: D/ER_rates(395): 12.4
04-07 14:35:11.897: D/ER_ids(395): 5
04-07 14:35:11.897: D/ER_rates(395): Baru
04-07 14:35:11.897: D/ER_tenors(395): 60
04-07 14:35:11.897: D/ER_rates(395): 12.5
04-07 14:35:11.897: D/ER_ids(395): 6
04-07 14:35:11.897: D/ER_rates(395): Baru
04-07 14:35:11.897: D/ER_tenors(395): 12
04-07 14:35:11.897: D/ER_rates(395): 12.6
04-07 14:35:11.897: D/ER_ids(395): 7
04-07 14:35:11.934: D/ER_rates(395): Baru
04-07 14:35:11.934: D/ER_tenors(395): 24
04-07 14:35:11.937: D/ER_rates(395): 12.7
04-07 14:35:11.937: D/ER_ids(395): 8
04-07 14:35:11.937: D/ER_rates(395): Baru
04-07 14:35:11.937: D/ER_tenors(395): 36
04-07 14:35:11.937: D/ER_rates(395): 12.8
04-07 14:35:11.937: D/ER_ids(395): 9
04-07 14:35:11.937: D/ER_rates(395): Baru
04-07 14:35:11.937: D/ER_tenors(395): 48
04-07 14:35:11.937: D/ER_rates(395): 12.9
04-07 14:35:11.937: D/ER_ids(395): 10
04-07 14:35:11.937: D/ER_rates(395): Baru
04-07 14:35:11.937: D/ER_tenors(395): 60
04-07 14:35:11.937: D/ER_rates(395): 13.0
04-07 14:35:11.937: D/Get AS(395): GEtting All AS
04-07 14:35:11.937: E/DatabaseHelper(395): SELECT * FROM asuransi_rate
04-07 14:35:11.947: D/AS_ids(395): 1
04-07 14:35:11.957: D/AS_tenors(395): 12
04-07 14:35:11.957: D/AS_tlos(395): 1.0
04-07 14:35:11.957: D/AS_comps(395): 2.0
04-07 14:35:11.957: D/AS_combs(395): 3.0
.
.
.
04-07 14:35:12.007: D/AS_ids(395): 15
04-07 14:35:12.007: D/AS_tenors(395): 60
04-07 14:35:12.047: D/AS_tlos(395): 1.14
04-07 14:35:12.047: D/AS_comps(395): 2.14
04-07 14:35:12.047: D/AS_combs(395): 3.14
04-07 14:35:16.258: W/KeyCharacterMap(395): No keyboard for id 0
04-07 14:35:16.258: W/KeyCharacterMap(395): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
04-07 14:35:54.967: D/dalvikvm(395): GC_FOR_MALLOC freed 5071 objects / 280936 bytes in 70ms
04-07 14:35:57.150: W/KeyCharacterMap(395): No keyboard for id 0
04-07 14:35:57.150: W/KeyCharacterMap(395): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
04-07 14:42:28.127: W/IInputConnectionWrapper(395): showStatusIcon on inactive InputConnection
04-07 14:42:33.598: D/dalvikvm(395): GC_EXPLICIT freed 1992 objects / 76432 bytes in 55ms
当它运行时，它会给出消息＆＃34;未读数据＆＃34;。意味着在尝试getExtras时它获得了空值。我哪里错了？ 我想将所有插入的数据传递给新活动（MediatorMaster，现在用于检查附加组件是否到达那里），然后将计算。怎么做？有什么建议吗？
提前致谢
答案 0 :(得分：2)
在你返回游标之前，你正在关闭游标。
如果您要返回游标，请在调用函数中完成游标后关闭游标。
Cursor getAllASrates() {
SQLiteDatabase db = this.getWritableDatabase();
Cursor cur = db.rawQuery("Select " + KEY_AS_ID + " as _id, "
+ KEY_AS_REGIONAL + ", " + KEY_AS_TENOR + ", " + KEY_AS_TLO
+ ", " + KEY_AS_COMPREHENSIVE + ", " + KEY_AS_COMBINE + ", "
+ " from " + TABLE_ASURANSI_RATE, new String[] {});
//close the cursor in the calling function after finished with it
//cur.close();
return cur;
}
这也是：
Cursor getAllERates() {
SQLiteDatabase db = this.getWritableDatabase();
// Cursor cur=
// db.rawQuery("Select "+colID+" as _id , "+colName+", "+colAge+" from "+employeeTable,
// new String [] {});
// Cursor cur= db.rawQuery("SELECT * FROM "+viewEmps,null);
Cursor cur = db.rawQuery("Select " + KEY_ER_ID + " as _id, "
+ KEY_ER_USEDORNEW + ", " + KEY_ER_TENOR + ", " + KEY_ER_RATE
+ ", " + " from " + TABLE_EFFECTIVE_RATE, new String[] {});
//close the cursor in the calling function after finished with it
//cur.close();
return cur;
}
更新
所以，看起来另一段代码存在问题，所以我对其进行了修改并发布在下面。尝试直接访问列，不要使用while循环，因为看起来这个游标只会返回一个结果。
如果“Cursor count：”日志条目的大小为零，那么您的查询不会返回任何数据。
这也显示了你应该关闭光标的位置。
class DataHandler extends Activity {
public void getData(int id) {
Cursor c = getERValues(id);
Log.d(LOG, "Cursor count: " + c.getCount());
if (c != null) {
if (c.moveToFirst()) {
String UorN = c.getString(0);
int er_t = c.getInt(1);
double er_r = c.getDouble(2);
// use these strings as you want
Intent Person = new Intent(this, MediatorMaster.class);
Person.putExtra("Used_or_New", UorN);
Person.putExtra("ER_tenor", er_t);
Person.putExtra("ER_rate", er_r);
startActivity(Person);
}
else{
Log.e(LOG, "Cursor could not moveToFirst ");
}
}
c.close(); //close the cursor here
}
}
答案 1 :(得分：1)
几天后，我找到了解决方案。感谢Daniel Nugent，Dev和Prashant Bhoir帮助我解决这个问题。解决方案是使用Array作为临时列表，它将读取特定表中的所有数据（您也可以读取特定列）。例如：
从表中的列获取值/某个值*： *它取决于你插入了多少数据。数组列表将获取所有数据，如果你没有插入任何值，那么它将给出null值。
public List<TheModelClass> getTheValue(String SomeValue) {
List<TheModelClass> NameOfTheList = new ArrayList<TheModelClass>();
String selectQuery = "SELECT * FROM " + TABLE_ONE + " where " + KEY_COLUMN_ONE + " = ?";
Log.e(LOG, selectQuery);
SQLiteDatabase db = this.getReadableDatabase();
Cursor c = db.rawQuery(selectQuery, new String[] {SomeValue});
// looping through all rows and adding to list
if (c.moveToFirst()) {
do {
TheModelClass AnythingYouWantToNameThis = new TheModelClass();
AnythingYouWantToNameThis.setModelValueNumberOne(c.getString(c.getColumnIndex(KEY_COLUMN_ONE)));
// add
NameOfTheList.add(AnythingYouWantToNameThis);
} while (c.moveToNext());
}
//always close the cursor after using it cause it may cause memory leak
c.close();
return NameOfTheList;
}
从表中获取值/某些值：
public List<TheModelClass> getAllNameOfTheList() {
List<TheModelClass> NameOfTheList = new ArrayList<TheModelClass>();
String selectQuery = "SELECT * FROM " + TABLE_ONE;
Log.e(LOG, selectQuery);
SQLiteDatabase db = this.getReadableDatabase();
Cursor c = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (c.moveToFirst()) {
do {
TheModelClass SomeName = new TheModelClass();
SomeName.setValueNumberOne(c.getString(c.getColumnIndex(KEY_COLUMN_ONE)));
SomeName.setValueNumberTwo(c.getInt(c.getColumnIndex(KEY_COLUMN_TWO)));
SomeName.setValueNumberThree(c.getDouble(c.getColumnIndex(KEY_COLUMN_THREE)));
SomeName.setValueNumberFour(c.getLong(c.getColumnIndex(KEY_COLUMN_FOUR)))
.
.
.
SomeName.setValueNumberX(c.getSomeDataTypeBasedOnTheTypeYouHaveSetInTheModelClass(c.getColumnIndex(THE_COLUMN)))
// add
NameOfTheList.add(SomeName);
} while (c.moveToNext());
}
// db.close();
c.close();
return NameOfTheList;
}
然后在类上调用它（假设这个类是数据库值处理程序） 对于1列：
// Database
YourDatabaseClass db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.testgetdata);
db = new YourDatabaseClass(getApplicationContext());
List<TheModelClass> Anything = db.getValue();
TheModelClass Value0 = Anything.get(0);
TheModelClass Value1 = Anything.get(1);
.
.
.
TheModelClass ValueX = Anything.get(X*);
String Value0 = Value0.getValue();
//2nd column
String Value1 = Value1.getValue();
//column X
String ValueX = ValueX.getValue();
Intent person = new Intent(this, NameOfTheClassThatYouWantToHaveThisValues.class);
Bundle backpack = new Bundle();
backpack.putString("AKA_47", Value0);
backpack.putString("Missile", Value1);
.
.
.
backpack.putString("Anything", ValueX);
person.putExtras(backpack);
setResult(RESULT_OK, person);
startActivity(person);
// Don't forget to close database connection
db.closeDB();
对于多个列： //数据库 YourDatabaseClass db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.testgetdata);
db = new YourDatabaseClass(getApplicationContext());
List<TheModelClass> Anything = db.getAllDataOfTheList();
TheModelClass Value0 = Anything.get(0);
TheModelClass Value1 = Anything.get(1);
.
.
.
TheModelClass ValueX = Anything.get(X*);
/*Based on how many row you have, Start with row 0 (zero)
* whenever TheModelClass Value0 = Anything.get(0); called then you will have
* column0Value0 column01alue1 column2Value2.........columnXValueX
*/
long Value0FromColumn0 = Value0.getId();
String Value1FromColumn0 = Value0.getName();
int Value2FromColumn0 = Value0.getPhoneNumber();
double Value3FromColumn0 = Value0.getETC();
//2nd column
long Value0FromColumn1 = Value1.getId();
String Value1FromColumn1 = Value1.getName();
int Value2FromColumn1 = Value1.getPhoneNumber();
double Value3FromColumn1 = Value1.getETC();
//column X
long ValueXFromColumnX = ValueX.getId();
String ValueXFromColumnX = ValueX.getName();
int ValueXFromColumnX = ValueX.getPhoneNumber();
double ValueXFromColumnX = ValueX.getETC();
Intent person = new Intent(this, NameOfTheClassThatYouWantToHaveThisValues.class);
Bundle backpack = new Bundle();
backpack.putLong("Pencil", Value0FromColumn0);
backpack.putString("Book", Value1FromColumn0);
backpack.putInt("Laptop", Value2FromColumn);
backpack.putDouble("Nuclear_BOMB", Value3FromColumn0);
backpack.putLong("Spiderman", Value0FromColumn1);
backpack.putString("IronMan", Value1FromColumn1);
backpack.putInt("Hercules", Value2FromColumn1);
backpack.putDouble("MasterYoda", Value3FromColumn1);
.
.
.
backpack.putLong("Monkey", ValueXFromColumnX);
backpack.putString("Dolphin", ValueXFromColumnX);
backpack.putInt("Alien", ValueXFromColumnX);
backpack.putDouble("Predator", ValueXFromColumnX);
person.putExtras(backpack);
setResult(RESULT_OK, person);
startActivity(person);
// Don't forget to close database connection
db.closeDB();
然后收到另一个班级的价值 多列：
@Override
protected void onCreate(Bundle bundle) {
// TODO Auto-generated method stub
super.onCreate(bundle);
setContentView(R.layout.test);
Bundle exploded = this.getIntent().getExtras();
if (this.getIntent().getExtras() != null) {
long id0 = exploded.getLong("Pencil");
String name0 = exploded.getString("Book");
int phoneNumber0 = exploded.getInt("Laptop");
double etc0 = exploded.getDouble("Nuclear_BOMB");
.
.
.
long X = exploded.getLong("X");
String Y = exploded.getString("Y");
int Z = exploded.getInt("Z");
double W = exploded.getDouble("W");
}
else {
Message.message(this, "unread datas");
}}
对于一栏：
Bundle exploded = this.getIntent().getExtras();
if (this.getIntent().getExtras() != null) {
String something0 = exploded.getString("AKA_47");
String anything0 = exploded.getString("Missile");
String whatever0 = exploded.getString("Anything");
.
.
.
String X = exploded.getString("X");
}
else {
Message.message(this, "unread datas");
}
如果你想知道什么是Message.message，它是一个类。代码：
import android.content.Context;
import android.widget.Toast;
public class Message {
public static void message(Context context, String message)
{
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
}
然后你拥有它们。快乐的编码！