java - 未在 SQLite 中创建表

Question

我正在尝试创建一个 SQLite 数据库并最初用数据填充它。当我通过 Eclipse 中的调试器运行程序时，屏幕上没有显示任何内容，但我从 LogCat 中得到以下信息:

sqlite returned: error code = 1, msg = no such table: Issues

这是一些代码(我将尝试仅显示需要的内容，但如果您需要查看更多内容，请告诉我):

MainActivity.java

public class MainActivity extends Activity {

//TAG for LogCat.
public static final String TAG = "SQLiteDebug";
private ListView mListViewIssues;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    //Load listview control.
    mListViewIssues = (ListView)findViewById(R.id.listIssues);

    //Create Data Creator.
    IssueInfoCreator creator = new IssueInfoCreator(this);

    creator.open();
    try {
        creator.insertRandomData();
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    //add data to listview through adapter.
    mListViewIssues.setAdapter(new IssueInfoAdapter(this, creator.queryAll()));

    //Close connection.
    creator.close();
}
}

IssueInfoCreator 的代码:

public class IssueInfoCreator {

//DB Adapter.
private DBAdapter mDBAdapter;

//Constructor.
public IssueInfoCreator(Context c){
    mDBAdapter = new DBAdapter(c);
}

//Open DBAdapter.
public void open(){
    mDBAdapter.open();
}

//Insert Random Data to get started.
public void insertRandomData() throws ParseException{
    long i = 999;
    Date dtDate = new Date();
    dtDate.parse("1/12/2012");

    mDBAdapter.insertIssue(i++, dtDate, "This is my ticket.  I'm having trouble starting my sim.");
    mDBAdapter.insertIssue(i++, dtDate, "I can't my sim to turn on, please help.");
    mDBAdapter.insertIssue(i++, dtDate, "Aircraft is not responding to callsign.");
    mDBAdapter.insertIssue(i++, dtDate, "TTS is not recognising when we attempt to land an aircraft.");
}

//Get all Issues from DB.
public List<IssueInfo> queryAll(){
    return mDBAdapter.fetchAllIssues();
}

//close connection.
public void close(){
    mDBAdapter.close();
}
}

DBAdapter 代码:

public class DBAdapter {

//Database fields.
public static final String ISSUES_TABLE = "Issues";
public static final String COL_ISSUE_ID = "_id";
public static final String COL_DATE_RECEIVED = "DateReceived";
public static final String COL_ISSUE_SUMMARY = "IssueSummary";

//Declarations.
private Context mContext;
private SQLiteDatabase mDB;
private DBHelper mDBHelper;

//Constructor.
public DBAdapter(Context c){
    mContext = c;
}

//Open DB Connection.
public DBAdapter open() throws SQLException{
    mDBHelper = new DBHelper(mContext);
    mDB = mDBHelper.getWritableDatabase();
    return this;
}

//Close DB Connection.
public void close(){
    mDBHelper.close();
}
//remaining code omitted for brevity...
}

最后是 DBHelper 的代码:

public class DBHelper extends SQLiteOpenHelper {

//Constants
private static final String DB_NAME = "dbOpenIssues";
private static final int DB_VERSION = 1;
private static final String CREATE_DB_SQL = 
        "CREATE TABLE Issues ( " +
                "_id int PRIMARY KEY, " +
                "DateReceived datetime NOT NULL, " +
                "IssueSummary text NOT NULL " +
                ");";
private static final String DROP_TABLE = 
        "DROP TABLE IF EXISTS Issues";

public DBHelper(Context context) {
    super(context, DB_NAME, null, DB_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL(CREATE_DB_SQL);
}

@Override   
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL(DROP_TABLE);
    onCreate(db);
}
}

如果我在附加模拟器的情况下运行它，我可以看到数据库是在文件资源管理器中创建的，但如果我在本地将其拉下来并使用 SQLiteMan 打开它，它只会显示 android_metadata 表。

有什么想法吗？再次，抱歉发了这么长的帖子，只是不想遗漏任何内容，不得不重新发布 10 次。

更新:

我尝试的一件事是在 LogCat 中打印 SQL 语句，但我注意到 onCreate(在 DBHelper 中)永远不会被调用:

public void onCreate(SQLiteDatabase db){
    Log.e("DB ERROR -- ", CREATE_DB_SQL);
    db.execSQL(CREATE_DB_SQL);
}

Answer 1

SQLite 中没有日期时间类型。要存储数据，您可以使用 TEXT。因此，在您的情况下，查询可以如下:

private static final String CREATE_DB_SQL = 
        "CREATE TABLE Issues (" +
                "_id integer PRIMARY KEY, " +
                "DateReceived text NOT NULL, " +
                "IssueSummary text NOT NULL)";

Here是数据类型的链接。