Question

我正在尝试在sqlite上创建一个表。我创建了30多个表，但是这个命令似乎不起作用。

private final String CREATE_TABLE_EVENTS_COLLECTION = "create table " + TABLE_EVENTS_COLLECTION
        + "(" + COLUMN_ID + " integer primary key autoincrement," + COLUMN_EVENT_NAME + " text , "
        + COLUMN_TIMESTAMP + "  integer , " + COLUMN_DETECTION_TIMESTAMP + "  integer , "
        + COLUMN_RECEIVED_TIMESTAMP + "  integer , " + COLUMN_SERVER_STATUS + " integer)";

这是我正在运行的命令：

database.execSQL(CREATE_TABLE_EVENTS_COLLECTION);

但是，我收到一个异常，看起来TABLE_EVENTS_COLLECTION是一个空字符串 - 它不是。

android.database.sqlite.SQLiteException: near "(": syntax error (code 1): , while compiling: create table (id integer primary key autoincrement,event_name text , timestamp  integer , detection_timestamp  integer , received_timestamp  integer , server_status integer)

完全代码：

public class NSQLiteOpenHelper extends SQLiteOpenHelper {
    private static final String TAG = NSQLiteOpenHelper.class.getSimpleName();

    // Database
    private static final String DATABASE_NAME = "db";
    private static final int DATABASE_VERSION = 50;

    // Tables
    public static final String TABLE_NODES = "nodes";
    public static final String TABLE_EVENTS_COLLECTION = "events_collection_log"; //Logging all the events received and sending it to the server.

    // Columns - Common (TABLE NODES)
    public static final String COLUMN_ID = "id";
    public static final String COLUMN_PAGE_ID = "page_id";
    public static final String COLUMN_TYPE = "type";
    public static final String COLUMN_NEURA_ID = "neura_id";
    public static final String COLUMN_NODE_DATA = "node_data";
    public static final String COLUMN_SENT_TO_SERVER = "sent";
    public static final String COLUMN_IMAGE_PATH = "image_path";
    public static final String COLUMN_SERVER_STATUS = "server_status";
    public static final String COLUMN_SERVER_RESPONSE_CODE = "server_response_code";
    public static final String COLUMN_SERVER_RESPONSE_TIMESTAMP = "server_response_timestamp";
    public static final String COLUMN_SERVER_LAST_UPDATE = "server_last_update";
    public static final String COLUMN_PENDING = "pending";
    public static final String COLUMN_AUTHENTICATION_URL = "auth_url";
    public static final String COLUMN_VENDOR = "vendor";
    public static final String COLUMN_NODE_IMAGE_SYNC_TO_SERVER = "image_sync_to_serve";
    public static final String COLUMN_NODE_TYPE = "node_type";
    public static final String COLUMN_RELATED_NODE_ID = "related_node_id";
    public static final String COLUMN_IS_ME = "isMe";

    // Columns (TABLE_DEVICES)
    public static final String COLUMN_DEVICE_ID = "device_id";

    // Columns (TABLE LIFELINE ITEMS)
    public static final String COLUMN_TIMESTAMP = "timestamp";
    public static final String COLUMN_DETECTION_TIMESTAMP = "detection_timestamp";
    public static final String COLUMN_RECEIVED_TIMESTAMP = "received_timestamp";

    public static final String COLUMN_EVENT_NAME = "event_name";

    private final String CREATE_TABLE_NODES = "create table " + TABLE_NODES + "(" + COLUMN_ID
            + " integer primary key autoincrement, " + COLUMN_VENDOR + " text, " + COLUMN_NODE_TYPE
            + " text, " + COLUMN_PAGE_ID + " integer ," + COLUMN_TYPE + " integer ,"
            + COLUMN_NEURA_ID + " text UNIQUE ," + COLUMN_NODE_DATA + " text ," + COLUMN_PENDING
            + " integer, " + COLUMN_SENT_TO_SERVER + " integer, " + COLUMN_DEVICE_ID + " text, "
            + COLUMN_IMAGE_PATH + " text, " + COLUMN_NODE_IMAGE_SYNC_TO_SERVER + " integer, "
            + COLUMN_AUTHENTICATION_URL + " text, " + COLUMN_RELATED_NODE_ID + " text, "
            + COLUMN_SERVER_STATUS + " integer, " + COLUMN_SERVER_RESPONSE_CODE + " integer, "
            + COLUMN_SERVER_RESPONSE_TIMESTAMP + " integer, " + COLUMN_IS_ME + " integer, "
            + COLUMN_SERVER_LAST_UPDATE + " integer)";

    private final String CREATE_TABLE_EVENTS_COLLECTION = "create table " + TABLE_EVENTS_COLLECTION
            + "(" + COLUMN_ID + " integer primary key autoincrement," + COLUMN_EVENT_NAME + " text , "
            + COLUMN_TIMESTAMP + "  integer , " + COLUMN_DETECTION_TIMESTAMP + "  integer , "
            + COLUMN_RECEIVED_TIMESTAMP + "  integer , " + COLUMN_SERVER_STATUS + " integer)";

    public NSQLiteOpenHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase database) {
        database.execSQL(CREATE_TABLE_NODES);
        database.execSQL(CREATE_TABLE_EVENTS_COLLECTION);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }

}

Answer 1

在创建表之后，您的TABLE_EVENTS_COLLECTION为空，没有表名。

std::wstring GetLastExtension(const std::wstring &fileName)
{
    auto pos = fileName.rfind(L".");
    if (pos == std::wstring::npos)
        pos = -1;
    return std::wstring(fileName.begin() + pos, fileName.end());
}

在sqlite（android）上创建表时收到错误

1 个答案: