insert

问题 I have two tables, tab1 and tab2. tab2 has all of the columns of tab1 but with an extra column for a timestamp. What I want to do is copy all of the rows from tab1 into tab2 and input the same time thae timestamp column for all rows that I insert. I can get and input the time fine, but I'm confused how to copy and insert data and fill in the last column with the timestamp for all of the rows that I inserted. So I want to do: Insert into tab2 select * from tab1 but I also want to add data for

问题 I want an insert function that calls a private recursive insert function that adds the next number to the end of a linked list. I am having trouble on which parameters I should use and what should be in the recursive insert function. I am thinking that the recursive insert function needs a Node pointer to step through recursively. class LinkedList{ private: struct Node{ int data; //stores data in nodes Node* next; ~Node(){delete next;} }; public: LinkedList(){ first = NULL;} ~LinkedList()

问题 I have an insert statement for my sqlite table that contains apostrophes in the values. NSString *sqlInsert = [NSString stringWithFormat:@"insert into myTable (_id, name, area, title, description, url) VALUES (%i, '%@', '%@', '%@', '%@', '%@')", tempObject.ID, tempObject.name, tempObject.area, tempObject.title, tempObject.description, tempObject.url]; The results of that string is this insert into myTable (_id, name, area, title, description, url) VALUES (0, 'John Smith', 'USA', 'Programmer',

问题 I am trying to input 1000's of rows on SQLite3 with insert however the time it takes to insert is way too long. I've heard speed is greatly increased if the inserts are combined into one transactions. However, i cannot seem to get SQlite3 to skip checking that the file is written on the hard disk. this is a sample: if repeat != 'y': c.execute('INSERT INTO Hand (number, word) VALUES (null, ?)', [wordin[wordnum]]) print wordin[wordnum] data.commit() This is what i have at the begining. data =

问题 In MS Access, I want to insert a new column into the returned result of a select query. The new column has the same value for every row. For example, my select returns columns A, B and I want C to be the new column created by the select query: A B C ---------- a1 b1 c a2 b2 c a3 b3 c 回答1: select A, B, 'c' as C from MyTable 回答2: SELECT field1, field2, 'example' AS newfield FROM TABLE1 This will add a column called "newfield" to the output, and its value will always be "example". 回答3: It

问题 In MS Access, I want to insert a new column into the returned result of a select query. The new column has the same value for every row. For example, my select returns columns A, B and I want C to be the new column created by the select query: A B C ---------- a1 b1 c a2 b2 c a3 b3 c 回答1: select A, B, 'c' as C from MyTable 回答2: SELECT field1, field2, 'example' AS newfield FROM TABLE1 This will add a column called "newfield" to the output, and its value will always be "example". 回答3: It

问题 Consider a list inside a list list1 = ["element1","element2",["subelement1","subelement2"]] subelement1 can be accessed by index [2][0] print (list1[2][0]) But how can I insert elements at [2][x] position if only two parameters can be passed to insert function. list.insert(index, element) Lets say i want to insert "subelement0" at [2],[0] . That makes the list : list1 = ["element1","element2",["subelement0","subelement1","subelement2"]] 回答1: Try to insert element to sublist as below: list1[2]

问题 I need to insert some text as the first character of my textbox when a button is clicked. Here is what I have tried: private void btnInsert_Click(object sender, EventArgs e) { txtMainView.Text.Insert(0, "TEST"); } This fails to insert the text when I click the button. Anyone have an idea what I am doing wrong? 回答1: txtMainView.Text = txtMainView.Text.Insert(0, "TEST"); Strings are immutable in .NET Framework so each operation creates a new instance, obviously does not change original string

问题 I need to insert some text as the first character of my textbox when a button is clicked. Here is what I have tried: private void btnInsert_Click(object sender, EventArgs e) { txtMainView.Text.Insert(0, "TEST"); } This fails to insert the text when I click the button. Anyone have an idea what I am doing wrong? 回答1: txtMainView.Text = txtMainView.Text.Insert(0, "TEST"); Strings are immutable in .NET Framework so each operation creates a new instance, obviously does not change original string

问题 When I create new objects with insertUI in a reactive way, all the observers that I create work perfectly fine, as you can see in the following dummy code: library(shiny) # Define the UI ui <- fluidPage( actionButton("adder", "Add"), tags$div(id = 'placeholder') ) # Define the server code server <- function(input, output) { rv <- reactiveValues() rv$counter <- 0 observeEvent(input$adder,{ rv$counter <- rv$counter + 1 add <- sprintf("%03d",rv$counter) filterId <- paste0('adder_', add) divId <-