私はAndroidプロジェクトにデータベースを実装するためにこのガイドに従ってきました。
これは私のDBAdapterクラスのコードです：
package com.sab.namespace;
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_PROPERTYID = "propertyid";
public static final String KEY_ADDRESS = "propertyaddress";
public static final String KEY_JOBNO = "jobnumber";
public static final String KEY_ASSIGNED = "assignedto";
public static final String KEY_COMPANY = "company";
public static final String KEY_DATE = "datecreated";
public static final String KEY_MASTERKEY = "usemasterkey";
public static final String KEY_PHONEBEFORE = "phonebefore";
public static final String KEY_PROBLEM = "descriptionofproblem";
private static final String TAG = "DBAdapter";
private static final String DATABASE_NAME = "SABDatabase";
private static final String DATABASE_TABLE = "jobs";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE =
"create table jobs (_id integer primary key autoincrement, "
+ "propertyid text not null, propertyaddress text not null, "
+ "jobnumber text not null, assignedto text not null, "
+ "company text not null, datecreated text not null, "
+ "usemasterkey text not null, phonebefore text not null, "
+ "descriptionofproblem text not null);";
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
public DBAdapter(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion
+ " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS jobs");
onCreate(db);
}
}
//---opens the database---
public DBAdapter open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
//---closes the database---
public void close()
{
DBHelper.close();
}
//---insert a job into the database---
public long insertJob(String propertyid, String propertyaddress, String jobnumber,
String assignedto, String company, String datecreated, String usemasterkey,
String phonebefore, String descriptionofproblem)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_PROPERTYID, propertyid);
initialValues.put(KEY_ADDRESS, propertyaddress);
initialValues.put(KEY_JOBNO, jobnumber);
initialValues.put(KEY_ASSIGNED, assignedto);
initialValues.put(KEY_COMPANY, company);
initialValues.put(KEY_DATE, datecreated);
initialValues.put(KEY_MASTERKEY, usemasterkey);
initialValues.put(KEY_PHONEBEFORE, phonebefore);
initialValues.put(KEY_PROBLEM, descriptionofproblem);
return db.insert(DATABASE_TABLE, null, initialValues);
}
//---deletes a particular job---
public boolean deleteJob(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
//---retrieves all the jobs---
public Cursor getAllJobs()
{
return db.query(DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_PROPERTYID,
KEY_ADDRESS,
KEY_JOBNO,
KEY_ASSIGNED,
KEY_COMPANY,
KEY_DATE,
KEY_MASTERKEY,
KEY_PHONEBEFORE,
KEY_PROBLEM},
null,
null,
null,
null,
null);
}
//---retrieves a particular job---
public Cursor getJob(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_PROPERTYID,
KEY_ADDRESS,
KEY_JOBNO,
KEY_ASSIGNED,
KEY_COMPANY,
KEY_DATE,
KEY_MASTERKEY,
KEY_PHONEBEFORE,
KEY_PROBLEM},
KEY_ROWID + "=" + rowId,
null,
null,
null,
null,
null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
//---updates a job---
public boolean updateJob(long rowId, String propertyid, String propertyaddress, String jobnumber,
String assignedto, String company, String datecreated, String usemasterkey,
String phonebefore, String descriptionofproblem)
{
ContentValues args = new ContentValues();
args.put(KEY_PROPERTYID, propertyid);
args.put(KEY_ADDRESS, propertyaddress);
args.put(KEY_JOBNO, jobnumber);
args.put(KEY_ASSIGNED, assignedto);
args.put(KEY_COMPANY, company);
args.put(KEY_DATE, datecreated);
args.put(KEY_MASTERKEY, usemasterkey);
args.put(KEY_PHONEBEFORE, phonebefore);
args.put(KEY_PROBLEM, descriptionofproblem);
return db.update(DATABASE_TABLE, args,
KEY_ROWID + "=" + rowId, null) > 0;
}
}
次に、ViewJobs.javaクラスでデータベースを使用しようとします
DBAdapter db = new DBAdapter(this);
db.open();
long id;
id = db.insertJob(
"PROP121",
"MARK ANDREWS DRIVE",
"JOB32",
"COLIN",
"SAB",
"12/4/13",
"yes",
"yes",
"SHIT IS EVERYWHERE");
id = db.insertJob(
"PROP122",
"FAULTY CLOSE",
"JOB33",
"DAVE",
"SAB",
"13/4/13",
"yes",
"yes",
"FIX PLEASE");
db.close();
Toast.makeText(this, Long.toString(id), Toast.LENGTH_LONG).show();
Toastは-1を出力します。これは、データの入力にエラーがあったことを示していますが、どこが間違っているのかわかりません。
エラーを無視して次のコードを続行すると、アプリケーションがクラッシュします。
db.open();
Cursor c = db.getAllJobs();
db.close();
誰かアドバイスをいただければ幸いです！
-ハリー
クラッシュしたときのlogcatコードは次のとおりです。
03-04 18:37:59.760: W/dalvikvm(2078): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
03-04 18:37:59.809: I/dalvikvm(2078): threadid=3: reacting to signal 3
03-04 18:37:59.958: E/AndroidRuntime(2078): FATAL EXCEPTION: main
03-04 18:37:59.958: E/AndroidRuntime(2078): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sab.namespace/com.sab.namespace.ViewJobs}: android.database.sqlite.SQLiteException: no such table: jobs: , while compiling: SELECT _id, propertyid, propertyaddress, jobnumber, assignedto, company, datecreated, usemasterkey, phonebefore, descriptionofproblem FROM jobs
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.app.ActivityThread.access$600(ActivityThread.java:123)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.os.Handler.dispatchMessage(Handler.java:99)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.os.Looper.loop(Looper.java:137)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.app.ActivityThread.main(ActivityThread.java:4424)
03-04 18:37:59.958: E/AndroidRuntime(2078): at java.lang.reflect.Method.invokeNative(Native Method)
03-04 18:37:59.958: E/AndroidRuntime(2078): at java.lang.reflect.Method.invoke(Method.java:511)
03-04 18:37:59.958: E/AndroidRuntime(2078): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-04 18:37:59.958: E/AndroidRuntime(2078): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-04 18:37:59.958: E/AndroidRuntime(2078): at dalvik.system.NativeStart.main(Native Method)
03-04 18:37:59.958: E/AndroidRuntime(2078): Caused by: android.database.sqlite.SQLiteException: no such table: jobs: , while compiling: SELECT _id, propertyid, propertyaddress, jobnumber, assignedto, company, datecreated, usemasterkey, phonebefore, descriptionofproblem FROM jobs
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:127)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:94)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:53)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1564)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1449)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1405)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1485)
03-04 18:37:59.958: E/AndroidRuntime(2078): at com.sab.namespace.DBAdapter.getAllJobs(DBAdapter.java:114)
03-04 18:37:59.958: E/AndroidRuntime(2078): at com.sab.namespace.ViewJobs.onCreate(ViewJobs.java:52)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.app.Activity.performCreate(Activity.java:4465)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
03-04 18:37:59.958: E/AndroidRuntime(2078): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
03-04 18:37:59.958: E/AndroidRuntime(2078): ... 11 more
03-04 18:37:59.969: I/dalvikvm(2078): Wrote stack traces to '/data/anr/traces.txt'
03-04 18:38:00.328: I/dalvikvm(2078): threadid=3: reacting to signal 3
03-04 18:38:00.358: I/dalvikvm(2078): Wrote stack traces to '/data/anr/traces.txt'
03-04 18:38:00.658: I/dalvikvm(2078): threadid=3: reacting to signal 3
03-04 18:38:00.799: I/dalvikvm(2078): Wrote stack traces to '/data/anr/traces.txt'
03-04 18:38:03.210: I/Process(2078): Sending signal. PID: 2078 SIG: 9
これがViewJobs.javaの完全なコードです
package com.sab.namespace;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class ViewJobs extends Activity {
String titles[] = {"hello","bannana","frogshehe","hello","bannana","frogshehe","hello","bannana","frogshehe","hello","bannana","frogshehe","hello","bannana","frogshehe"};
ListView vListView;
ArrayAdapter<String> lVAAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view);
//database stuff
DBAdapter db = new DBAdapter(this);
db.open();
long id;
id = db.insertJob(
"PROP121",
"MARK ANDREWS DRIVE",
"JOB32",
"COLIN",
"SAB",
"12/4/13",
"yes",
"yes",
"SHIT IS EVERYWHERE");
id = db.insertJob(
"PROP122",
"FAULTY CLOSE",
"JOB33",
"DAVE",
"SAB",
"13/4/13",
"yes",
"yes",
"FIX PLEASE");
db.close();
Toast.makeText(this, Long.toString(id), Toast.LENGTH_LONG).show();
db.open();
Cursor c = db.getAllJobs();
db.close();
/*
if (c.moveToFirst())
{
do {
DisplayJob(c);
} while (c.moveToNext());
}
db.close();
*/
//create list
vListView = (ListView) findViewById(R.id.vlistview);
lVAAdapter = new ArrayAdapter<String>(ViewJobs.this,
android.R.layout.simple_list_item_1, titles);
//create listener
vListView.setAdapter(lVAAdapter);
vListView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> lVAAdapter, View myView,
int myItemInt, long mylng) {
String selectedFromList = (String) (vListView.getItemAtPosition(myItemInt));
if (titles[myItemInt] == "hello") {
titles[2] = "test";
vListView.invalidateViews();
}
}
});
}
public void DisplayJob(Cursor c)
{
Toast.makeText(this,
"id: " + c.getString(0) + "\n" +
"propertyid: " + c.getString(1) + "\n" +
"propertyaddress: " + c.getString(2) + "\n" +
"jobnumber: " + c.getString(3) + "\n" +
"assignedto: " + c.getString(4) + "\n" +
"company: " + c.getString(5) + "\n" +
"datecreated: " + c.getString(6) + "\n" +
"usemasterkey: " + c.getString(7) + "\n" +
"phonebefore: " + c.getString(8) + "\n" +
"descriptionofproblem: " + c.getString(9),
Toast.LENGTH_LONG).show();
}
}