android - SQLite 异常 - 创建表

Question

我遇到了一个异常，但我不明白为什么会抛出它。当我添加表格消息时出现异常。请看一下，看看是否有我遗漏的错误。提前致谢。

异常(exception):

 Caused by: android.database.sqlite.SQLiteException: near "From": syntax error (code 1): , while compiling: CREATE TABLE Messages (UniqueId TEXT PRIMARY KEY,From TEXT,To TEXT,Subject TEXT,Body TEXT,HandledOn TEXT,IsRead INTEGER,CreatedOn TEXT,UpdatedOn TEXT,DeletedOn TEXT);

引发异常的语句，在SQLiteOpenHelper中:

@Override
public void onCreate(android.database.sqlite.SQLiteDatabase db) {
    String CREATE_MESSAGES_TABLE =
            "CREATE TABLE " + TABLE_MESSAGES + "("
                    + COLUMN_UNIQUEID + " TEXT PRIMARY KEY,"
                    + COLUMN_FROM + " TEXT,"
                    + COLUMN_TO + " TEXT,"
                    + COLUMN_SUBJECT + " TEXT,"
                    + COLUMN_BODY + " TEXT,"
                    + COLUMN_HANDLEDON + " TEXT,"
                    + COLUMN_ISREAD + " INTEGER,"
                    + COLUMN_CREATEDON + " TEXT,"
                    + COLUMN_UPDATEDON + " TEXT,"
                    + COLUMN_DELETEDON + " TEXT"
                    + ");";

    String CREATE_CONTACTS_TABLE =
            "CREATE TABLE " + TABLE_CONTACTS + "("
                    + COLUMN_UNIQUEID + " TEXT PRIMARY KEY,"
                    + COLUMN_NAME + " TEXT,"
                    + COLUMN_EMAIL + " TEXT,"
                    + COLUMN_CREATEDON + " TEXT,"
                    + COLUMN_UPDATEDON + " TEXT,"
                    + COLUMN_DELETEDON + " TEXT"
                    + ");";

    db.execSQL(CREATE_MESSAGES_TABLE);
    db.execSQL(CREATE_CONTACTS_TABLE);
}

Answer 1

您正在使用诸如“from”和“to”之类的 protected 关键字作为表名，这在 SQLite 中是不允许的:

https://www.sqlite.org/lang_keywords.html