我想将所有数据库值都放入我的arraylist并在logcat中显示。但是我从arraylist获得价值时遇到了一些问题。我把我的洞代码，我能够获得价值，但从模型中获得最后的价值。
我的MainActivity
package com.example.databasework;
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
Button btnInsertCW, btnInsertCD, btnGetAllVAlue;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnInsertCW = (Button) findViewById(R.id.btnInsertCW);
btnInsertCD = (Button) findViewById(R.id.btnInsertCD);
btnGetAllVAlue = (Button) findViewById(R.id.btnGetAllVAlue);
btnInsertCW.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v1) {
// TODO Auto-generated method stub
Database transactionDb = new Database(getApplicationContext());
TransactionModel transactionModel = new TransactionModel();
transactionDb.open();
transactionModel.setDate("14/2/2015");
transactionModel.setTime("11:12:15");
transactionModel.setEnrollment("CW");
transactionDb.insert(transactionModel);
transactionDb.close();
}
});
btnInsertCD.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v2) {
// TODO Auto-generated method stub
Database transactionDb = new Database(getApplicationContext());
TransactionModel transactionModel = new TransactionModel();
transactionDb.open();
transactionModel.setDate("28/3/2014");
transactionModel.setTime("09:08:06");
transactionModel.setEnrollment("CD");
transactionDb.insert(transactionModel);
transactionDb.close();
}
});
btnGetAllVAlue.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v3) {
// TODO Auto-generated method stub
ArrayList<TransactionModel> arrayList = new ArrayList<TransactionModel>();
Database transactionDb = new Database(getApplicationContext());
transactionDb.open();
arrayList = transactionDb.getReportPrintTrns();
transactionDb.close();
System.err.println(arrayList);
for (int i = 0; i < arrayList.size(); i++)
{
TransactionModel transactionModel = arrayList.get(i);
System.err.println(transactionModel.getEnrollment());
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
in arrayList = transactionDb.getReportPrintTrns（）;想要所有的数据库价值。
我的数据库
package com.example.databasework;
import java.util.ArrayList;
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.SQLiteOpenHelper;
import android.util.Log;
public class Database {
private static final String DATABASE_NAME = "KisanMitra.db";
public static final String DATABASE_TABLE = "TransactionDb";
private static final int DATABASE_VERSION = 1;
public static final String TrnsNo = "TrnsNo";
public static final String Enrollment = "Enrollment";
public static final String CardNumber = "CardNumber";
public static final String EnrollmentAmount = "EnrollmentAmount";
public static final String Date = "Date";
public static final String Time = "Time";
public static final String ReturnStatus = "ReturnStatus";
public static final String TotalCashWithdrawalAmount = "TotalCashWithdrawalAmount";
public static final String TotalCashDepositAmount = "TotalCashDepositAmount";
public static final String TallyCash = "TallyCash";
public static final String KindPurchase = "KindPurchase";
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);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL("create table " +DATABASE_TABLE + "("
+ TrnsNo + " INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,"
+ Enrollment + " text,"
+ Date + " text,"
+ CardNumber + " text,"
+ Time + " text,"
+ ReturnStatus + " text,"
+ EnrollmentAmount + " text,"
+ TotalCashDepositAmount + " text,"
+ TotalCashWithdrawalAmount + " text,"
+ KindPurchase + " text,"
+ TallyCash + " text);");
Log.e("TransationDb", "Create Succssfully");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
if (oldVersion >= newVersion)
return;
String sql = null;
if (oldVersion == 1)
sql = "alter table " + DATABASE_TABLE + " add note text;";
if (oldVersion == 2)
sql = "";
Log.d("EventsData", "onUpgrade : " + sql);
if (sql != null)
db.execSQL(sql);
}
}
public Database open() throws SQLException {
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public Database(Context c) {
ourContext = c;
}
public void close() {
ourHelper.close();
}
public void insert(TransactionModel TransactionSetter)
{
String iEnrollment = TransactionSetter.getEnrollment();
String iEnrollmentAmount = TransactionSetter.getEnrollmentAmount();
String iDate = TransactionSetter.getDate();
String iTime = TransactionSetter.getTime();
String iReturnStatus = TransactionSetter.getReturnStatus();
String iCardNumber = TransactionSetter.getCardNumber();
String iTotalCashWithdrawalAmount = TransactionSetter.getTotalCashWithdrawalAmount();
String iTotalCashDepositAmount = TransactionSetter.getTotalCashDepositAmount();
String iTallyCash = TransactionSetter.getTallyCash();
String iKindPurchase = TransactionSetter.getKindPurchase();
ContentValues contentValues = new ContentValues();
contentValues.put(Enrollment, iEnrollment);
contentValues.put(EnrollmentAmount, iEnrollmentAmount);
contentValues.put(Date, iDate);
contentValues.put(Time, iTime);
contentValues.put(ReturnStatus, iReturnStatus);
contentValues.put(CardNumber, iCardNumber);
contentValues.put(TotalCashWithdrawalAmount,iTotalCashWithdrawalAmount);
contentValues.put(TotalCashDepositAmount, iTotalCashDepositAmount);
contentValues.put(TallyCash, iTallyCash);
contentValues.put(KindPurchase, iKindPurchase);
ourDatabase.insert(DATABASE_TABLE, null, contentValues);
}
public ArrayList<TransactionModel> getReportPrintTrns() {
ArrayList<TransactionModel> list = new ArrayList<TransactionModel>();
TransactionModel model = new TransactionModel();
String whereClause = Enrollment + " in ('CW', 'CD')";
String[] columns = new String[] { TrnsNo, Enrollment, EnrollmentAmount,
Date, Time, ReturnStatus, CardNumber,
TotalCashWithdrawalAmount, TotalCashDepositAmount, TallyCash, KindPurchase };
Cursor c=ourDatabase.query(DATABASE_TABLE, columns, whereClause,null,null,null,null);
int itransno = c.getColumnIndex(TrnsNo);
int iEnrollment = c.getColumnIndex(Enrollment);
int iEnrollmentAmount = c.getColumnIndex(EnrollmentAmount);
int iDate = c.getColumnIndex(Date);
int iTime = c.getColumnIndex(Time);
int iReturnStatus = c.getColumnIndex(ReturnStatus);
int iCardNumber = c.getColumnIndex(CardNumber);
int iTotalCashWithdrawalAmount = c.getColumnIndex(TotalCashWithdrawalAmount);
int iTotalCashDepositAmount = c.getColumnIndex(TotalCashDepositAmount);
int iTallyCash = c.getColumnIndex(TallyCash);
int iKindPurchase = c.getColumnIndex(KindPurchase);
if (c.moveToFirst()) {
do {
model.setTrnsNo(c.getString(itransno));
model.setEnrollment(c.getString(iEnrollment));
System.err.println("iEnrollmentType :- "+c.getString(iEnrollment));
model.setEnrollmentAmount(c.getString(iEnrollmentAmount));
model.setDate(c.getString(iDate));
model.setTime(c.getString(iTime));
model.setReturnStatus(c.getString(iReturnStatus));
model.setCardNumber(c.getString(iCardNumber));
model.setTotalCashWithdrawalAmount(c.getString(iTotalCashWithdrawalAmount));
model.setTotalCashDepositAmount(c.getString(iTotalCashDepositAmount));
model.setTallyCash(c.getString(iTallyCash));
model.setKindPurchase(c.getString(iKindPurchase));
list.add(model);
} while (c.moveToNext());
}
c.close();
c.deactivate();
return list;
}
}
我的SetGet模型
package com.example.databasework;
public class TransactionModel {
String TrnsNo, Enrollment, EnrollmentAmount, Date, Time, ReturnStatus,
CardNumber, TotalCashWithdrawalAmount,
TotalCashDepositAmount, TallyCash, KindPurchase;
public TransactionModel() {
// TODO Auto-generated constructor stub
TrnsNo = "";
Enrollment = "";
EnrollmentAmount = "";
Date = "";
ReturnStatus = "";
Time = "";
CardNumber = "";
TotalCashWithdrawalAmount = "";
TotalCashDepositAmount = "";
TallyCash = "";
KindPurchase = "";
}
public String getTrnsNo() {
return TrnsNo;
}
public void setTrnsNo(String trnsNo) {
TrnsNo = trnsNo;
}
public String getEnrollment() {
return Enrollment;
}
public void setEnrollment(String enrollment) {
Enrollment = enrollment;
}
public String getEnrollmentAmount() {
return EnrollmentAmount;
}
public void setEnrollmentAmount(String enrollmentAmount) {
EnrollmentAmount = enrollmentAmount;
}
public String getDate() {
return Date;
}
public void setDate(String date) {
Date = date;
}
public String getTime() {
return Time;
}
public void setTime(String time) {
Time = time;
}
public String getReturnStatus() {
return ReturnStatus;
}
public void setReturnStatus(String returnStatus) {
ReturnStatus = returnStatus;
}
public String getCardNumber() {
return CardNumber;
}
public void setCardNumber(String cardNumber) {
CardNumber = cardNumber;
}
public String getTotalCashWithdrawalAmount() {
return TotalCashWithdrawalAmount;
}
public void setTotalCashWithdrawalAmount(String totalCashWithdrawalAmount) {
TotalCashWithdrawalAmount = totalCashWithdrawalAmount;
}
public String getTotalCashDepositAmount() {
return TotalCashDepositAmount;
}
public void setTotalCashDepositAmount(String totalCashDepositAmount) {
TotalCashDepositAmount = totalCashDepositAmount;
}
public String getTallyCash() {
return TallyCash;
}
public void setTallyCash(String tallyCash) {
TallyCash = tallyCash;
}
public String getKindPurchase() {
return KindPurchase;
}
public void setKindPurchase(String kindPurchase) {
KindPurchase = kindPurchase;
}
}
获得价值
02-14 10:31:23.620: W/System.err(10564): iEnrollmentType :- CW
02-14 10:31:23.620: W/System.err(10564): iEnrollmentType :- CD
02-14 10:31:23.620: W/System.err(10564): iEnrollmentType :- CW
02-14 10:31:23.620: W/System.err(10564): iEnrollmentType :- CW
02-14 10:31:23.620: W/System.err(10564): iEnrollmentType :- CD
02-14 10:31:23.631: W/System.err(10564): CD
02-14 10:31:23.640: W/System.err(10564): CD
02-14 10:31:23.640: W/System.err(10564): CD
02-14 10:31:23.640: W/System.err(10564): CD
02-14 10:31:23.640: W/System.err(10564): CD
在Last Fine行中我获得相同的值，但数据库的值类似于
CW
CD
CW
CW
CD
答案 0 :(得分：1)
每次在 dowhile 中为TransactionModel创建新对象，如下所示
public ArrayList<TransactionModel> getReportPrintTrns() {
ArrayList<TransactionModel> list = new ArrayList<TransactionModel>();
TransactionModel model;
String whereClause = Enrollment + " in ('CW', 'CD')";
String[] columns = new String[] { TrnsNo, Enrollment, EnrollmentAmount,
Date, Time, ReturnStatus, CardNumber,
TotalCashWithdrawalAmount, TotalCashDepositAmount, TallyCash, KindPurchase };
Cursor c=ourDatabase.query(DATABASE_TABLE, columns, whereClause,null,null,null,null);
int itransno = c.getColumnIndex(TrnsNo);
int iEnrollment = c.getColumnIndex(Enrollment);
int iEnrollmentAmount = c.getColumnIndex(EnrollmentAmount);
int iDate = c.getColumnIndex(Date);
int iTime = c.getColumnIndex(Time);
int iReturnStatus = c.getColumnIndex(ReturnStatus);
int iCardNumber = c.getColumnIndex(CardNumber);
int iTotalCashWithdrawalAmount = c.getColumnIndex(TotalCashWithdrawalAmount);
int iTotalCashDepositAmount = c.getColumnIndex(TotalCashDepositAmount);
int iTallyCash = c.getColumnIndex(TallyCash);
int iKindPurchase = c.getColumnIndex(KindPurchase);
if (c.moveToFirst()) {
do {
model=new TransactionModel();
model.setTrnsNo(c.getString(itransno));
model.setEnrollment(c.getString(iEnrollment));
System.err.println("iEnrollmentType :- "+c.getString(iEnrollment));
model.setEnrollmentAmount(c.getString(iEnrollmentAmount));
model.setDate(c.getString(iDate));
model.setTime(c.getString(iTime));
model.setReturnStatus(c.getString(iReturnStatus));
model.setCardNumber(c.getString(iCardNumber));
model.setTotalCashWithdrawalAmount(c.getString(iTotalCashWithdrawalAmount));
model.setTotalCashDepositAmount(c.getString(iTotalCashDepositAmount));
model.setTallyCash(c.getString(iTallyCash));
model.setKindPurchase(c.getString(iKindPurchase));
list.add(model);
} while (c.moveToNext());
}
c.close();
c.deactivate();
return list;
}
答案 1 :(得分：0)
getReportPrintTrns（）方法中只有一个问题。你必须初始化你的交易模型。像TransactionModel model = new TransactionModel（）;