填充一个Android SQLite数据库 [英] Populating an Android SQLite Database
本文介绍了填充一个Android SQLite数据库的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我目前正在填充在android系统中创建一个数据库表。我创建了一个数据库适配器，让我的活动，以运行该适配器的方法。
Currently i'm trying to populate a database table created in android. I have created a database adapter which allows my activities to run the methods from this adapter.
DBAdapter.java 的
DBAdapter.java
package com.example.universitybudgetub;
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 DBAdapter {
public static final String KEY_ROWID = "id";
public static final String KEY_FOOD = "food";
public static final String KEY_CLOTHES = "clothes";
public static final String KEY_SUPERMARKET = "supermarket";
public static final String KEY_TAXI= "taxi";
public static final String KEY_SPORTS = "sports";
public static final String KEY_CLUBS_BARS = "clubs_bars";
public static final String KEY_OWED_MONEY = "owed_money";
public static final String KEY_OTHER = "other";
public static final String KEY_ELECTRIC_GAS = "electric_gas";
public static final String KEY_WATERBILL = "waterbill";
public static final String KEY_RENT = "rent";
public static final String KEY_HOUSE = "house";
public static final String KEY_INTERNETBILL = "internetbill";
private static final String TAG = "DBAdapter";
private static String DATABASE_NAME = "ExpensesDB";
private static final String DATABASE_TABLE = "expenses";
private static final int DATABASE_VERSION = 2;
private static final String DATABASE_CREATE =
"create table if not exists assignments (id integer primary key autoincrement, " +
"food VARCHAR, clothes VARCHAR, supermarket VARCHAR, taxi VARCHAR, sports VARCHAR, clubs_bars VARCHAR, owed_money VARCHAR, other VARCHAR, electric_gas VARCHAR, waterbill VARCHAR, rent VARCHAR, house VARCHAR, internetbill VARCHAR);";
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
public DBAdapter(Context ctx){
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
//Instantiate's all the database methods
public static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context){
super (context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db){
try{
db.execSQL(DATABASE_CREATE);
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
Log.w(TAG, "Upgrading data from version " + oldVersion + " to " + newVersion + " , which wll destroy all old data");
db.execSQL("DROP TABLE IF EXISTS contacts");
onCreate(db);
}
}
//Opens database
public DBAdapter open() throws SQLException{
db = DBHelper.getWritableDatabase();
return this;
}
//Close database
public void close(){
DBHelper.close();
}
//Insert record to database
public long insertRecord(String food, String clothes, String supermarket, String taxi, String sports, String clubs_bars,
String owed_money, String other, String electric_gas, String waterbill, String rent, String house, String internetbill){
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_FOOD, food);
initialValues.put(KEY_CLOTHES, clothes);
initialValues.put(KEY_SUPERMARKET, supermarket);
initialValues.put(KEY_TAXI, taxi);
initialValues.put(KEY_SPORTS, sports);
initialValues.put(KEY_CLUBS_BARS, clubs_bars);
initialValues.put(KEY_OWED_MONEY, owed_money);
initialValues.put(KEY_OTHER, other);
initialValues.put(KEY_ELECTRIC_GAS, electric_gas);
initialValues.put(KEY_WATERBILL, waterbill);
initialValues.put(KEY_RENT, rent);
initialValues.put(KEY_HOUSE, house);
initialValues.put(KEY_INTERNETBILL, internetbill);
return db.insert(DATABASE_TABLE, null, initialValues);
}
//Delete particular record
public boolean deleterRecord(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
//Retrieve particular record
public Cursor getRecord(long rowId) throws SQLException
{
Cursor mCursor = db.query(true, DATABASE_TABLE, new String[] {KEY_ROWID, KEY_FOOD, KEY_CLOTHES, KEY_TAXI, KEY_SPORTS,
KEY_CLUBS_BARS, KEY_OWED_MONEY, KEY_OTHER, KEY_ELECTRIC_GAS, KEY_WATERBILL, KEY_RENT, KEY_HOUSE, KEY_INTERNETBILL},
KEY_ROWID + "=" + rowId, null, null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
//Update particular record
public boolean updateRecord(long rowId, int food, int clothes, int taxi, int sports, int clubs_bars, int owed_money, int other,
int electric_gas, int waterbill, int rent, int house, int internetbill){
ContentValues args = new ContentValues();
args.put(KEY_FOOD, food);
args.put(KEY_CLOTHES, clothes);
args.put(KEY_TAXI, taxi);
args.put(KEY_SPORTS, sports);
args.put(KEY_CLUBS_BARS, clubs_bars);
args.put(KEY_OWED_MONEY, owed_money);
args.put(KEY_OTHER, other);
args.put(KEY_ELECTRIC_GAS, electric_gas);
args.put(KEY_WATERBILL, waterbill);
args.put(KEY_RENT, rent);
args.put(KEY_HOUSE, house);
args.put(KEY_INTERNETBILL, internetbill);
return db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
}
MainMenu.java 的
MainMenu.java
package com.example.universitybudgetub;
import java.io.File;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainMenu extends FragmentActivity {
DBAdapter db = new DBAdapter(this);
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
//OnCreate
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_menu);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
public void onClick(View v){
String destPath = "/data/data/" + getPackageName() + "/databases/ExpensesDB";
@SuppressWarnings("unused")
File f = new File(destPath);
}
//Add New Record
public void addRecord (View v){
Log.d("test", "adding");
//Get data from form
EditText foodTxt = (EditText)findViewById(R.id.editText_food);
EditText taxiTxt = (EditText)findViewById(R.id.editText_taxi);
EditText clothesTxt = (EditText)findViewById(R.id.editText_clothes);
EditText sportsTxt = (EditText)findViewById(R.id.editText_sports);
EditText supermarketTxt = (EditText)findViewById(R.id.editText_supermarket);
EditText clubs_barsTxt = (EditText)findViewById(R.id.editText_clubs);
EditText owed_moneyTxt = (EditText)findViewById(R.id.editText_owed_money);
EditText otherTxt = (EditText)findViewById(R.id.editText_other);
EditText electric_gasTxt = (EditText)findViewById(R.id.editText_electric_gas);
EditText waterbillTxt = (EditText)findViewById(R.id.editText_water);
EditText houseTxt = (EditText)findViewById(R.id.editText_house);
EditText rentTxt = (EditText)findViewById(R.id.editText_rent);
EditText internetTxt = (EditText)findViewById(R.id.editText_internet);
db.open();
@SuppressWarnings("unused")
long id = db.insertRecord(foodTxt.getText().toString(), clothesTxt.getText().toString(),
supermarketTxt.getText().toString(), taxiTxt.getText().toString(), sportsTxt.getText().toString(),
clubs_barsTxt.getText().toString(), owed_moneyTxt.getText().toString(), otherTxt.getText().toString(),
electric_gasTxt.getText().toString(), waterbillTxt.getText().toString(), rentTxt.getText().toString(),
houseTxt.getText().toString(), internetTxt.getText().toString());
db.close();
Log.d("test", "added");
//Set editText fields to empty
foodTxt.setText("");
taxiTxt.setText("");
clothesTxt.setText("");
sportsTxt.setText("");
supermarketTxt.setText("");
clubs_barsTxt.setText("");
owed_moneyTxt.setText("");
otherTxt.setText("");
electric_gasTxt.setText("");
waterbillTxt.setText("");
houseTxt.setText("");
rentTxt.setText("");
internetTxt.setText("");
Toast.makeText(MainMenu.this, "Expenses Added", Toast.LENGTH_LONG).show();
}
//OnCreateOptionsMenu
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return true;
}
//SectionsPagerAdapter Controls which Fragment is retrieved for each page
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Fragment fragment;
switch (position) {
case 0:
fragment = new Fragment1();
break;
case 1:
fragment = new Fragment2();
break;
case 2:
fragment = new Fragment3();
break;
case 3:
fragment = new Fragment4();
break;
case 4:
fragment = new Fragment5();
break;
default:
fragment = null;
break;
}
return fragment;
}
//Returns the amount of pages to display
@Override
public int getCount() {
// Show 3 total pages.
return 5;
}
//Page Title
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return getString(R.string.title_section1);
case 1:
return getString(R.string.title_section2);
case 2:
return getString(R.string.title_section3);
case 3:
return getString(R.string.title_section4);
case 4:
return getString(R.string.title_section5);
}
return null;
}
}
}
这是它不断抛出每当我试图挽救从EDITTEXT场动态输入信息的错误信息是：
The error message that it keeps throwing whenever I try to save the information dynamically inputted from a editText field is:
01-26 17:41:27.814: E/SQLiteLog(3973): (1) no such table: expenses
01-26 17:41:27.854: E/SQLiteDatabase(3973): Error inserting clubs_bars=1 supermarket=1 other=1 taxi=1 clothes=1 food=1 waterbill=1 electric_gas=1 sports=1 rent=1 internetbill=1 house=1 owed_money=1
01-26 17:41:27.854: E/SQLiteDatabase(3973): android.database.sqlite.SQLiteException: no such table: expenses (code 1): , while compiling: INSERT INTO expenses(clubs_bars,supermarket,other,taxi,clothes,food,waterbill,electric_gas,sports,rent,internetbill,house,owed_money) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1467)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at com.example.universitybudgetub.DBAdapter.insertRecord(DBAdapter.java:97)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at com.example.universitybudgetub.MainMenu.addRecord(MainMenu.java:60)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at java.lang.reflect.Method.invokeNative(Native Method)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at java.lang.reflect.Method.invoke(Method.java:525)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.view.View$1.onClick(View.java:3628)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.view.View.performClick(View.java:4240)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.view.View$PerformClick.run(View.java:17721)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.os.Handler.handleCallback(Handler.java:730)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.os.Handler.dispatchMessage(Handler.java:92)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.os.Looper.loop(Looper.java:137)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at android.app.ActivityThread.main(ActivityThread.java:5103)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at java.lang.reflect.Method.invokeNative(Native Method)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at java.lang.reflect.Method.invoke(Method.java:525)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-26 17:41:27.854: E/SQLiteDatabase(3973): at dalvik.system.NativeStart.main(Native Method)
01-26 17:41:27.854: D/test(3973): added
01-26 17:41:28.264: I/Choreographer(3973): Skipped 100 frames! The application may be doing too much work on its main thread.
我可以看到主要的原因，多数民众赞成它抛出这个例外是，显然没有这样的表：费'但很明显，这是错的？正如我在的onCreate方案创建一个费用表，当我检查DDMS和经历数据/数据/包名/数据库/ ExpensesDB - 我找到数据库文件在创建了..
I can see the main reason thats it's throwing this exception is that apparently 'no such table: expenses' but clearly this is wrong? As I've created an expenses table in an onCreate scenario, and when I check the 'DDMS' and going through data/data/packagename/databases/ExpensesDB - I find the database file having created..
奇怪的看着，不能找到我的源$ C $ C的任何问题。任何帮助将是巨大的！
Bizarre looking and cannot find any problem with my source code. Any help would be great!
推荐答案
您所创建的表称为分配，但不表'费用'。修改你的DATABASE_CREATE声明。
You are creating the table called assignments but not the table 'expenses'. Amend your DATABASE_CREATE statement.
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