StringBuilder sb = new StringBuilder(); for(int i=0;i<100;i++){ sb.insert(0, Integer.toString(i)); } Warning: It defeats the purpose of StringBuilder, but it does what you asked. Better technique (although still not ideal): Reverse each string you want to insert. Append each string to a StringBuilder. Reverse the entire StringBuilder when you’re done. This will turn an O(n²) solution … Read more
You can use the following code to add column to Datatable at postion 0: DataColumn Col = datatable.Columns.Add(“Column Name”, System.Type.GetType(“System.Boolean”)); Col.SetOrdinal(0);// to put the column in position 0;
I would suggest you to use the function add_column() from the tibble package. library(tibble) dataset <- data.frame(a = 1:5, b = 2:6, c=3:7) add_column(dataset, d = 4:8, .after = 2) Note that you can use column names instead of column index : add_column(dataset, d = 4:8, .after = “b”) Or use argument .before instead of … Read more
You want: insert into prices (group, id, price) select 7, articleId, 1.50 from article where name like ‘ABC%’; where you just hardcode the constant fields.
Assembling one INSERT statement with multiple rows is much faster in MySQL than one INSERT statement per row. That said, it sounds like you might be running into string-handling problems in PHP, which is really an algorithm problem, not a language one. Basically, when working with large strings, you want to minimize unnecessary copying. Primarily, … Read more
Since set_value has been deprecated since version 0.21.0, you should now use at. It can insert a list into a cell without raising a ValueError as loc does. I think this is because at always refers to a single value, while loc can refer to values as well as rows and columns. df = pd.DataFrame(data={‘A’: … Read more
As of C++11, you have two major additional options. First, you can use insert() with list initialization syntax: function.insert({0, 42}); This is functionally equivalent to function.insert(std::map<int, int>::value_type(0, 42)); but much more concise and readable. As other answers have noted, this has several advantages over the other forms: The operator[] approach requires the mapped type to … Read more
You can supply literal values in the SELECT: INSERT INTO TABLE1 (id, col_1, col_2, col_3) SELECT id, ‘data1’, ‘data2’, ‘data3’ FROM TABLE2 WHERE col_a=”something”; A select list can contain any value expression: But the expressions in the select list do not have to reference any columns in the table expression of the FROM clause; they … Read more
You can always use String.format(….). i.e., String string = String.format(“A String %s %2d”, aStringVar, anIntVar); I’m not sure if that is attractive enough for you, but it can be quite handy. The syntax is the same as for printf and java.util.Formatter. I’ve used it much especially if I want to show tabular numeric data.
l.insert(index, obj) doesn’t actually return anything. It just updates the list. As ATO said, you can do b = a[:index] + [obj] + a[index:]. However, another way is: a = [1, 2, 4] b = a[:] b.insert(2, 3)