我正在尝试使用 DatePicker 使用日期字段更新我的 SQLite 数据库。为了简单起见（就我而言），我决定只使用日期并将其传递给字符串以仅使用字符串更新数据库（我不想在这种情况下执行任何 DATETIME 函数。
数据库工作（至少，通过我设置的对话框）但是当数据被转换为 TextView 时，什么也没有出现，eclipse stacktrace 也会报告以下内容：
05-09 22:47:30.164: E/SQLiteDatabase(3112): Error inserting chest=100 arms=android.widget.TextView@4125c110 legs=100 waist=100 weight=100
05-09 22:47:30.164: E/SQLiteDatabase(3112): android.database.sqlite.SQLiteConstraintException: personalStats.date may not be NULL (code 19)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:775)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1469)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at com.uhi.fatfighter.Stats.createEntry(Stats.java:86)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at com.uhi.fatfighter.MainActivity.onClick(MainActivity.java:250)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.view.View.performClick(View.java:4084)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.view.View$PerformClick.run(View.java:16966)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.os.Handler.handleCallback(Handler.java:615)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.os.Handler.dispatchMessage(Handler.java:92)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.os.Looper.loop(Looper.java:137)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at android.app.ActivityThread.main(ActivityThread.java:4928)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at java.lang.reflect.Method.invokeNative(Native Method)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at java.lang.reflect.Method.invoke(Method.java:511)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
05-09 22:47:30.164: E/SQLiteDatabase(3112): at dalvik.system.NativeStart.main(Native Method)
下面是处理 SQL 的类：
public class Stats {
public static final String KEY_ROWID = "_id";
public static final String KEY_WEIGHT = "weight";
public static final String KEY_WAIST = "waist";
public static final String KEY_CHEST = "chest";
public static final String KEY_LEGS = "legs";
public static final String KEY_ARMS = "arms";
public static final String KEY_DATE = "date";
private static final String DATABASE_NAME = "statsDB";
private static final String DATABASE_TABLE = "personalStats";
private static final int DATABASE_VERSION = 4;
private DbHelper ffHelper;
private final Context ffContext;
private SQLiteDatabase ffDatabase;
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 + " (" + KEY_ROWID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_WEIGHT
+ " TEXT NOT NULL, " + KEY_WAIST + " TEXT NOT NULL, "
+ KEY_CHEST + " TEXT NOT NULL, " + KEY_LEGS
+ " TEXT NOT NULL, " + KEY_ARMS + " TEXT NOT NULL,"
+ KEY_DATE + " TEXT NOT NULL);");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(db);
}
}
public Stats(Context c) {
ffContext = c;
}
public Stats open() throws SQLException {
ffHelper = new DbHelper(ffContext);
ffDatabase = ffHelper.getWritableDatabase();
return this;
}
public void close() {
ffHelper.close();
}
public long createEntry(String weight, String waist, String chest, String legs, String arms, String date) {
ContentValues cv = new ContentValues();
cv.put(KEY_WEIGHT, weight);
cv.put(KEY_WAIST, waist);
cv.put(KEY_CHEST, chest);
cv.put(KEY_LEGS, legs);
cv.put(KEY_ARMS, arms);
cv.put(KEY_ARMS, date);
return ffDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getData() {
String[] columns = new String[] { KEY_ROWID, KEY_WEIGHT, KEY_WAIST, KEY_CHEST, KEY_LEGS, KEY_ARMS, KEY_DATE};
Cursor c = ffDatabase.query(DATABASE_TABLE, columns, null, null, null,
null, null);
String result = "";
int iRow = c.getColumnIndex(KEY_ROWID);
int iWeight = c.getColumnIndex(KEY_WEIGHT);
int iWaist = c.getColumnIndex(KEY_WAIST);
int iChest = c.getColumnIndex(KEY_CHEST);
int iLegs = c.getColumnIndex(KEY_LEGS);
int iArms = c.getColumnIndex(KEY_ARMS);
int iDate = c.getColumnIndex(KEY_DATE);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
result = result + c.getString(iRow) + " " + c.getString(iWeight)
+ " " + c.getString(iWaist)
+ " " + c.getString(iChest)
+ " " + c.getString(iLegs)
+ " " + c.getString(iArms)
+ " " + c.getString(iDate)+ "\n";
}
return result;
}
}
视图类：
public class DBView extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.view_stats);
TextView tv = (TextView) findViewById(R.id.tvDBInfo);
Stats dbInfo = new Stats(this);
dbInfo.open();
String data = dbInfo.getData();
dbInfo.close();
tv.setText(data);
}
EditTexts 和 DatePicker 在我的 main_activity 中，如果有帮助，我可以发布吗？