sqlite

问题 I'm working with the new Node.js Tools for Visual Studio and included the sqlite3 npm module. When I call require('sqlite3') it throws the error: Error: Cannot find module './binding\Debug\node-v11-win32-ia32\node_sqlite3.node' Odd thing is, when I ignore the error and continue running the code, everything works fine...until the function I'm in returns; then the server crashes. Has anyone else had this issue? I have a suspicion that it has something to do with the ./binding part, but wouldn't

问题 I have inserted some values in the table DataTab . SomeId: Integer => Autogenerated primary key. DataId: Guid DataNumber: Integer DataType: varchar The above are the column's in my tables, I want to find, if the table contains Repeated DataId values. It has been long time I had worked with databases. Now I can figure out simple queries. But I found this some what difficult. I tried the following query, is this correct? SELECT * from (Select * from DataTab) AS X where DataId= X.DataId AND

问题 I'm really stumped on this. I can add an item to my database by using a form just fine but how do I delete from it? I like to delete it either by clicking on it or clicking on it and then clicking the "remove" button. Flask @app.route('/', methods=["GET", "POST"]) def home(): db = get_db() if request.method == "GET": return render_template("index.html") else: item = request.form['item'] session['item'] = item quantity = request.form['quantity'] session['quantity'] = quantity db.execute(

问题 I'm really stumped on this. I can add an item to my database by using a form just fine but how do I delete from it? I like to delete it either by clicking on it or clicking on it and then clicking the "remove" button. Flask @app.route('/', methods=["GET", "POST"]) def home(): db = get_db() if request.method == "GET": return render_template("index.html") else: item = request.form['item'] session['item'] = item quantity = request.form['quantity'] session['quantity'] = quantity db.execute(

问题 I'm really stumped on this. I can add an item to my database by using a form just fine but how do I delete from it? I like to delete it either by clicking on it or clicking on it and then clicking the "remove" button. Flask @app.route('/', methods=["GET", "POST"]) def home(): db = get_db() if request.method == "GET": return render_template("index.html") else: item = request.form['item'] session['item'] = item quantity = request.form['quantity'] session['quantity'] = quantity db.execute(

问题 I was doing a tutorial and came across a way to handle connections with sqlite3, Then I studied about the WITH keyword and found out that it is an alternative to try,except,finally way of doing things It was said that in case of file-handling, 'WITH' automatically handles closing of files and I thought similar with the connection as said in zetcode tutorial:- "With the with keyword, the Python interpreter automatically releases the resources. It also provides error handling." http://zetcode

问题 I have populated recyclerview from sqlite .when clicking each row ,row will delete from sqlite but recyclerview not showing updated list after delete. Recycler view show updated list only after launching activity once again. My question is how to update the recycler view soon after deleting an item from the recylcerview without refresh. following are my code SecondActivity.java import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget

问题 I have entered some text wrapped with html tags in SQLite database, and I want to display those text in phone. for example: I have entered 10^-7 in SQLite database, I want to render 10 -7 in phone. This is the image of SQLite from DB Browser for SQLite: This is part of the DBHelper: public List<Quizplay> getQuestionGuj(int cate_id, int sub_cate_id, int noOfQuestion, int level) { List<Quizplay> quizplay = new ArrayList<Quizplay>(); int total = noOfQuestion; String sql = "select *

问题 I have entered some text wrapped with html tags in SQLite database, and I want to display those text in phone. for example: I have entered 10^-7 in SQLite database, I want to render 10 -7 in phone. This is the image of SQLite from DB Browser for SQLite: This is part of the DBHelper: public List<Quizplay> getQuestionGuj(int cate_id, int sub_cate_id, int noOfQuestion, int level) { List<Quizplay> quizplay = new ArrayList<Quizplay>(); int total = noOfQuestion; String sql = "select *

问题 I am using Recyclerview on a fragment when i run the app and open the activity it crashes.I am new to android so i am not able to implement Recyclerview with SQlite as i followed some code on internet and implemented in my code but my app crashes log 02-25 11:53:20.362 19942-19942/com.navinkadlak.typroject E/AndroidRuntime: FATAL EXCEPTION: main Process: com.navinkadlak.typroject, PID: 19942 java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.support.v7