rename

问题 I am migrating a Room database in my Android app. This is the migration code: static final Migration MIGRATION_1_2 = new Migration(1, 2) { @Override public void migrate(SupportSQLiteDatabase database) { database.execSQL("ALTER TABLE item RENAME itemInfoId TO itemId"); } }; The error message android.database.sqlite.SQLiteException: near "itemInfoId": syntax error (code 1 SQLITE_ERROR): , while compiling: ALTER TABLE item RENAME itemInfoId TO itemId I have also tried the SQL of "ALTER TABLE

问题 An NTFS directory is open in a bash shell. what command will recursively truncate all filenames in a directory to the 255 character limit required for ext3? 回答1: If you have access to a Windows shell, you can use: @echo off setlocal EnableDelayedExpansion REM loop over all files in the cwd for /f %%a in ('dir /a-d /b') do ( REM store this filename in a variable so we can do substringing set ThisFileName=%%a REM now take a substring set ThisShortFileName=!ThisFileName:~0,255! REM finally, the

问题 An NTFS directory is open in a bash shell. what command will recursively truncate all filenames in a directory to the 255 character limit required for ext3? 回答1: If you have access to a Windows shell, you can use: @echo off setlocal EnableDelayedExpansion REM loop over all files in the cwd for /f %%a in ('dir /a-d /b') do ( REM store this filename in a variable so we can do substringing set ThisFileName=%%a REM now take a substring set ThisShortFileName=!ThisFileName:~0,255! REM finally, the

问题 Question Is it possible to exclude certain file patters from rename detection when doing merges with git? Background With our system, Salesforce.com, some metadata files are exactly identical, except for name. Because of this (I believe) merges can get a bunch of conflicts, e.g. if a meta file was deleted in one branch, and a different meta file with an identical body is deleted in another, it sees things as a rename and conflict with one added on deleted. I know I can tweak the sensitivity

问题 Searched Google and SO and couldn't find a good answer. I have the following table: Country Value 23 Bolivia 2575.684 71 Guyana 3584.693 125 Paraguay 3878.150 49 Ecuador 5647.638 126 Peru 6825.461 38 Colombia 7752.168 151 Suriname 9376.495 25 Brazil 11346.796 7 Argentina 11610.220 171 Venezuela 12766.725 168 Uruguay 14702.505 37 Chile 15363.098 All values are in US dollars - I'd like to add in the dollar signs and the commas. Bolivia's value should therefore read $2,575.684. Also, is there

问题 This seems like it should be easy, but I've never been able to figure out how to do it. Using data.table I want to sum a column, C , by another column A , and just keep those two columns. At the same time, I want to be able to name the new column. My attempts and desired output: library(data.table) dt <- data.table(A= c('a', 'b', 'b', 'c', 'c'), B=c('19', '20', '21', '22', '23'), C=c(150,250,20,220,130)) # Desired Output - is there a way to do this in one step using data.table? # new.data <-

问题 This seems like it should be easy, but I've never been able to figure out how to do it. Using data.table I want to sum a column, C , by another column A , and just keep those two columns. At the same time, I want to be able to name the new column. My attempts and desired output: library(data.table) dt <- data.table(A= c('a', 'b', 'b', 'c', 'c'), B=c('19', '20', '21', '22', '23'), C=c(150,250,20,220,130)) # Desired Output - is there a way to do this in one step using data.table? # new.data <-

问题 I need to implement a script (duplq.sh) that would rename all the text files existing in the current directory using the command line arguments. So if the command duplq.sh pic 0 3 was executed, it would do the following transformation: pic0.txt will have to be renamed pic3.txt pic1.txt to pic4.txt pic2.txt to pic5.txt pic3.txt to pic6.txt etc… So the first argument is always the name of a file the second and the third always a positive digit. I also need to make sure that when I execute my

问题 I need to implement a script (duplq.sh) that would rename all the text files existing in the current directory using the command line arguments. So if the command duplq.sh pic 0 3 was executed, it would do the following transformation: pic0.txt will have to be renamed pic3.txt pic1.txt to pic4.txt pic2.txt to pic5.txt pic3.txt to pic6.txt etc… So the first argument is always the name of a file the second and the third always a positive digit. I also need to make sure that when I execute my

问题 Hey i'm trying to rename some columsn by adding "Last_" with the new version of dplyr but I keep getting this error Error: `across()` must only be used inside dplyr verbs. this is my code data %>% rename(across(everything(), ~paste0("Last_", .))) dplyr version: v1.0.2 回答1: We can use rename_with instead of rename library(dplyr) library(stringr) data %>% rename_with(~str_c("Last_", .), everything()) Reproducible example data(iris) head(iris) %>% rename_with(~str_c("Last_", .), .cols =