BDAccess/Docs/sqlFunctions-doc.Rmd

---
title: "sqlFunctions-Doc"
output:
  html_document:
    toc: true
    toc_depth: 2
---

```{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)
}
```

---

## sqlInitizalize

### Description
Loads required libraries and gets the db location.

### Usage
sqlInitialize()

### Arguments
Argument|Description
---|---

### Details
Loads required libraries and gets the db location from "ruta_database.R" file.

### Value
Invisibly for success (and failures cause errors).

### Examples
```r
sqlInitialize()
```

### Function
```r
sqlInitialize<-function(){
  library(tidyverse)
  library(RODBC)
  library(openxlsx)
  
  ## Conexión a la base de datos
  source("ruta_database.R", encoding = "UTF-8")
}
```