StoredProcedure: SQL Server Stored Procedure: Class Generator

Článek
02/28/2023

StoredProcedure: generates a SQLServer Stored Procedure Object and optionally a .sql file containing a query to create a stored procedure. StoredProcedure$registrationVec contains strings representing the queries needed for creation of the stored procedure

Usage

  StoredProcedure (func, spName, ..., filePath = NULL ,dbName = NULL,
  connectionString = NULL, batchSeparator = "GO")

Arguments

`func`

A valid R function or a string name of a valid R function: 1) All of the variables that the function relies on should be defined either inside the function or come in as input parameters. Among the input parameters there can be at most 1 data frame 2) The function should return either a data frame, a named list, or NULL. There can be at most one data frame inside the list.

`spName`

A character string specifying name for the stored procedure.

`...`

Optional input and output parameters for the stored procedure; must be objects of classes InputData, InputParameter, or outputParameter.

`filePath`

A character string specifying a path to the directory in which to create the .sql. If NULL the .sql file is not generated.

`dbName`

A character string specifying name of the database to use.

`connectionString`

A character string specifying the connection string.

`batchSeparator`

Desired SQL batch separator (only relevant if filePath is defined)

Value

SQLServer Stored Procedure Object

Examples


 ## Not run:

 ############# Example 1 #############
 # etl1 - reads from and write directly to the database
 etl1 <- function() {
   # The query to get the data
   qq <- "select top 10000 ArrDelay,CRSDepTime,DayOfWeek from AirlineDemoSmall"
   # The connection string
   conStr <- paste("Driver={ODBC Driver 13 for SQL Server};Server=.;Database=RevoTestDB;",
                 "Trusted_Connection=Yes;", sep = "")
   # The data source - retrieves the data from the database
   dsSqls <- RxSqlServerData(sqlQuery=qq, connectionString=conStr)
   # The destination data source
   dsSqls2 <- RxSqlServerData(table ="cleanData",  connectionString = conStr)
   # A transformation function
   transformFunc <- function(data) {
     data$CRSDepHour <- as.integer(trunc(data$CRSDepTime))
     return(data)
   }
   # The transformation variables
   transformVars <- c("CRSDepTime")
   rxDataStep(inData = dsSqls,
              outFile = dsSqls2,
              transformFunc=transformFunc,
              transformVars=transformVars,
              overwrite = TRUE)
   return(NULL)
 }
 # Create a StoredProcedure object
 sp_ds_ds <- StoredProcedure(etl1, "spTest",
                        filePath = ".", dbName ="RevoTestDB")
 # Define a connection string
 conStr <- paste("Driver={ODBC Driver 13 for SQL Server};Server=.;Database=RevoTestDB;",
                 "Trusted_Connection=Yes;", sep = "")
 # register the stored procedure with a database
 registerStoredProcedure(sp_ds_ds, conStr)
 # execute the stored procedure
 executeStoredProcedure(sp_ds_ds, connectionString = conStr)


 ############# Example 2 #############
 # train 1 takes a data frame with clean data and outputs a model
 train1 <- function(in_df) {
   in_df[,"DayOfWeek"] <- factor(in_df[,"DayOfWeek"], levels=c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"))
   # The model formula
   formula <- ArrDelay ~ CRSDepTime + DayOfWeek + CRSDepHour:DayOfWeek
   # Train the model
   rxSetComputeContext("local")
   mm <- rxLinMod(formula, data=in_df)
   mm <- rxSerializeModel(mm)
   return(list("mm" = mm))
 }
 # create InputData Object for an input parameter that is a data frame
 # note: if the input parameter is not a data frame use InputParameter object
 id <- InputData(name = "in_df",
                defaultQuery = paste0("select top 10000 ArrDelay,CRSDepTime,",
                                      "DayOfWeek,CRSDepHour from cleanData"))
 # create an OutputParameter object for the variable inside the return list
 # note: if that variable is a data frame use OutputData object
 out <- OutputParameter("mm", "raw")

 # connections string
 conStr <- paste0("Driver={ODBC Driver 13 for SQL Server};Server=.;Database=RevoTestDB;",
                  "Trusted_Connection=Yes;")
 # create the stored procedure object
 sp_df_op <- StoredProcedure("train1", "spTest1", id, out,
                        filePath = ".")
 # register the stored procedure with the database
 registerStoredProcedure(sp_df_op, conStr)

 # get the linear model
 model <- executeStoredProcedure(sp_df_op, connectionString = conStr)
 mm <- rxUnserializeModel(model$params$op1)
## End(Not run)

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