· 8 years ago · Aug 11, 2018, 05:06 AM
1Android: SQLite database
212-07 15:27:11.567: E/AndroidRuntime(15797): Caused by: android.database.sqlite.SQLiteException: no such column: recipient: , while compiling: SELECT _id, recipient, body FROM notes
3
4public class MessagesDBAdapter {
5
6 public static final String KEY_RECIPIENT = "recipient";
7 public static final String KEY_MESSAGE = "message";
8 public static final String KEY_ROWID = "_id";
9
10 private static final String TAG = "MessagesDBAdapter";
11 private DatabaseHelper mDbHelper;
12 private SQLiteDatabase mDb;
13
14
15 //Database creation sql statement
16
17 private static final String DATABASE_CREATE =
18 "create table notes (_id integer primary key autoincrement, "
19 + "title text not null, body text not null);";
20
21 private static final String DATABASE_NAME = "data";
22 private static final String DATABASE_TABLE = "notes";
23 private static final int DATABASE_VERSION = 2;
24
25 private final Context mCtx;
26
27 private static class DatabaseHelper extends SQLiteOpenHelper {
28
29 DatabaseHelper(Context context) {
30 super(context, DATABASE_NAME, null, DATABASE_VERSION);
31 }
32
33 @Override
34 public void onCreate(SQLiteDatabase db) {
35 db.execSQL(DATABASE_CREATE);
36 }
37
38 @Override
39 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
40 Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
41 + newVersion + ", which will destroy all old data");
42 db.execSQL("DROP TABLE IF EXISTS notes");
43 onCreate(db);
44 }
45 }
46
47 /**
48 * Constructor - takes the context to allow the database to be
49 * opened/created
50 *
51 * @param ctx the Context within which to work
52 */
53 public MessagesDBAdapter(Context ctx) {
54 this.mCtx = ctx;
55 }
56
57 public MessagesDBAdapter open() throws SQLException {
58 mDbHelper = new DatabaseHelper(mCtx);
59 mDb = mDbHelper.getWritableDatabase();
60 return this;
61 }
62
63 public void close() {
64 mDbHelper.close();
65 }
66
67 public long createNote(String phoneNo, String message) {
68 ContentValues initialValues = new ContentValues();
69 initialValues.put(KEY_RECIPIENT, phoneNo);
70 initialValues.put(KEY_MESSAGE, message);
71
72 open();
73
74 return mDb.insert(DATABASE_TABLE, null, initialValues);
75 }
76
77 public boolean deleteNote(long rowId) {
78
79 return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
80 }
81
82 public Cursor fetchAllNotes() {
83
84 return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_RECIPIENT,
85 KEY_MESSAGE}, null, null, null, null, null);
86 }
87
88 public Cursor fetchNote(long rowId) throws SQLException {
89
90 Cursor mCursor =
91
92 mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
93 KEY_RECIPIENT, KEY_MESSAGE}, KEY_ROWID + "=" + rowId, null,
94 null, null, null, null);
95 if (mCursor != null) {
96 mCursor.moveToFirst();
97 }
98 return mCursor;
99
100 }
101
102 public boolean updateNote(long rowId, String phoneNo, String message) {
103 ContentValues args = new ContentValues();
104 args.put(KEY_RECIPIENT, phoneNo);
105 args.put(KEY_MESSAGE, message);
106
107 return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
108 }
109}
110
11112-07 16:10:23.797: E/AndroidRuntime(16596): FATAL EXCEPTION: main
11212-07 16:10:23.797: E/AndroidRuntime(16596): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.KAHTextApp/com.example.KAHTextApp.KAHTextApp}: java.lang.NullPointerException
11312-07 16:10:23.797: E/AndroidRuntime(16596): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
11412-07 16:10:23.797: E/AndroidRuntime(16596): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
11512-07 16:10:23.797: E/AndroidRuntime(16596): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
11612-07 16:10:23.797: E/AndroidRuntime(16596): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
11712-07 16:10:23.797: E/AndroidRuntime(16596): at android.os.Handler.dispatchMessage(Handler.java:99)
11812-07 16:10:23.797: E/AndroidRuntime(16596): at android.os.Looper.loop(Looper.java:123)
11912-07 16:10:23.797: E/AndroidRuntime(16596): at android.app.ActivityThread.main(ActivityThread.java:4627)
12012-07 16:10:23.797: E/AndroidRuntime(16596): at java.lang.reflect.Method.invokeNative(Native Method)
12112-07 16:10:23.797: E/AndroidRuntime(16596): at java.lang.reflect.Method.invoke(Method.java:521)
12212-07 16:10:23.797: E/AndroidRuntime(16596): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
12312-07 16:10:23.797: E/AndroidRuntime(16596): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
12412-07 16:10:23.797: E/AndroidRuntime(16596): at dalvik.system.NativeStart.main(Native Method)
12512-07 16:10:23.797: E/AndroidRuntime(16596): Caused by: java.lang.NullPointerException
12612-07 16:10:23.797: E/AndroidRuntime(16596): at com.example.KAHTextApp.MessagesDBAdapter.fetchNote(MessagesDBAdapter.java:98)
12712-07 16:10:23.797: E/AndroidRuntime(16596): at com.example.KAHTextApp.KAHTextApp.populateFields(KAHTextApp.java:190)
12812-07 16:10:23.797: E/AndroidRuntime(16596): at com.example.KAHTextApp.KAHTextApp.onCreate(KAHTextApp.java:68)
12912-07 16:10:23.797: E/AndroidRuntime(16596): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
13012-07 16:10:23.797: E/AndroidRuntime(16596): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
131
132private static final String DATABASE_CREATE =
133 "create table notes (" + KEY_ROWID + " integer primary key autoincrement, "
134 + KEY_RECIPIENT + " text not null, " + KEY_MESSAGE + " text not null);";
135
136...
137public static final String KEY_MESSAGE = "message";
138
139...
140private static final String DATABASE_CREATE =
141 "create table notes (_id integer primary key autoincrement, "
142 + "title text not null, body text not null);";
143...
144public Cursor fetchAllNotes() {
145
146 return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_RECIPIENT,
147 KEY_MESSAGE}, null, null, null, null, null);
148}