You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
986 B
45 lines
986 B
---
|
|
title: "sqlFunctions-Doc"
|
|
output: html_document
|
|
---
|
|
|
|
```{r setup, include=FALSE}
|
|
knitr::opts_chunk$set(echo = TRUE)
|
|
```
|
|
|
|
|
|
## sqlDropLast
|
|
|
|
### Description
|
|
Removes from Database the last (or the amount specified) entry.
|
|
|
|
### Usage
|
|
sqlDropLast(conn, tablename, droplast=1)
|
|
|
|
### Arguments
|
|
Argument|Description
|
|
---|---
|
|
conn|connection handle returned by odbcConnect.
|
|
tablename|character: a database table name accessible from the connected DSN.
|
|
droplast|the amount of lines to be removed from the table strating from tail. By default, it removes only 1 line.
|
|
|
|
### Details
|
|
Removes from Database the last (or the amount specified) entry.
|
|
|
|
### Value
|
|
Invisibly for success (and failures cause errors).
|
|
|
|
### Examples
|
|
```r
|
|
dta<-odbcConnect("test")
|
|
sqlDropLast(dta, "TableTest")
|
|
```
|
|
|
|
### Function
|
|
```r
|
|
sqlDropLast<-function(conn, tablename, droplast=1){
|
|
table<-sqlFetch(conn, tablename)
|
|
table<-table[1:(nrow(table)-droplast),]
|
|
sqlSave(conn, table, tablename = tablename, safer = F)
|
|
}
|
|
```
|