sqlite

问题 I am fetching the SQLite's data in the textView and it is showing following error. I've also set permission of READ and WRITE_EXTERNAL_STORAGE in mainfest but still I'm getting this error: this is quotes.java file: public class quotes extends SQLiteOpenHelper { private static final String Database_name = "quotes.db"; private static final String Database_path = "/data/data/com.birnepal.entrancekoguide/databases/"; private static final String Table_name = "quotes"; private static final String

问题 I have two related tables namely users and roles and the relationship between them is many-to-many, so another association table userroles also exists. The userroles table keeps track of the associated users and roles rows using foreign keys. For the foreign keys the ondelete parameter is set to "CASCADE" to get rid of the association row if any of the associated elements are being deleted. This is my setup: import sqlalchemy as sa engine = sa.create_engine("sqlite:///:memory:", echo=True)

问题 I am developing a mobile application that uses Sqlite and I would like to pull the .db file from the phone and view it in DB Browser for Sqlite. The issue comes from the fact that when I run the adb commands the .db file I get is empty, even though I have creatd tables and added data to those tables in the database. In the application I query the database for the inserted records and they are returned. Any thoughts? adb command: adb exec-out run-as projectname cat databases/my.db > my.db db

问题 I am developing a mobile application that uses Sqlite and I would like to pull the .db file from the phone and view it in DB Browser for Sqlite. The issue comes from the fact that when I run the adb commands the .db file I get is empty, even though I have creatd tables and added data to those tables in the database. In the application I query the database for the inserted records and they are returned. Any thoughts? adb command: adb exec-out run-as projectname cat databases/my.db > my.db db

问题 I am developing a mobile application that uses Sqlite and I would like to pull the .db file from the phone and view it in DB Browser for Sqlite. The issue comes from the fact that when I run the adb commands the .db file I get is empty, even though I have creatd tables and added data to those tables in the database. In the application I query the database for the inserted records and they are returned. Any thoughts? adb command: adb exec-out run-as projectname cat databases/my.db > my.db db

问题 I'm trying to add the following text to my database: Zeeland '96 But the single quote is giving me errors. It should look like this: INSERT INTO Department (Code, Name, CountryID) VALUES ('ZE', 'Zeeland '96', 1) As you can see, at this moment is one quote missing, how can I get rid of this problem? Thanks in advance! 回答1: As you can see HERE you need to escape it by using two single quotes in a row. Try: INSERT INTO Department (Code, Name, CountryID) VALUES ('ZE', 'Zeeland ''96', 1) 回答2:

问题 I've written a Python script to add rows to my tables. I decided it would be nice if I could also view my tables with the same script instead of having to either quit the script and run sqlite3 or switch to another shell and run sqlite3. So I wrote up what I expected would give me what I want and it sort of does... This is the part of the script in question: import sqlite3 conn = sqlite3.connect('stu.db') c = conn.cursor() var = 1 while var == 1: enquiry = raw_input("What would you like to do

问题 I've written a Python script to add rows to my tables. I decided it would be nice if I could also view my tables with the same script instead of having to either quit the script and run sqlite3 or switch to another shell and run sqlite3. So I wrote up what I expected would give me what I want and it sort of does... This is the part of the script in question: import sqlite3 conn = sqlite3.connect('stu.db') c = conn.cursor() var = 1 while var == 1: enquiry = raw_input("What would you like to do

问题 I have a query in Sqlite that involves a complicated column calculation, let's say: SELECT 1+1 AS a; I want to have this calculation selected as a , but I also need to use it as a component of another calculation: SELECT 1+1 AS a, a+2 AS b; Unfortunately this produces the error: Error: no such column: a I know that I could simply repeat the calculation again for b : SELECT 1+1 AS a, 1+1+2 AS b; But assuming 1+1 is some complicated and expensive operation, is there any way that I can reference

问题 I'm really at a loss because this makes no sense at all. I call save/create an object, and it dosn't show up in the admin site. I even checked the SQLite database with a SQLite Viewer program, which again showed that the item had not been saved. This is the code that saves the Data object: data = Data(represents=field, for_entry=entry, value="This can be anything") # field is a DataField db object and entry is a Entry db object (see model below and paragraph) print("B4", data) #<---- Shows