InputParameter: Input Parameter for SQL Stored Procedure: Class Generator

Άρθρο
02/28/2023

InputParameter: generates an InputParameter Object, that captures the information about the input parameters of the R function that is to be embedded into a SQL Server Stored Procesure. Those will become the input parameters of the stored procedure. Supported R types of the input parameters are POSIXct, numeric, character, integer, logical, and raw.

Usage

  InputParameter(name, type, defaultValue = NULL, defaultQuery = NULL,
  value = NULL, enableOutput = FALSE)

Arguments

`name`

A character string, the name of the input parameter object.

`type`

A character string representing the R type of the input parameter object.

`defaultValue`

Default value of the parameter. Not supported for "raw".

`defaultQuery`

A character string specifying the default query that will retrieve the data if a different query is not provided at the time of the execution of the stored procedure.

`value`

A value that will be used for the parameter in the next run of the stored procedure.

`enableOutput`

Make this an Input/Output Parameter

Value

InputParameter Object

Examples


 ## Not run:

 # See ?StoredProcedure for creating the `cleandata` table.
 # and ?executeStoredProcedure for creating the `rdata` table. 

 # score1 makes a batch prediction given clean data(indata),
 # model object(model_param), and the new name of the variable
 # that is being predicted
 score1 <- function(indata, model_param, predVarName) {
 indata[,"DayOfWeek"] <- factor(indata[,"DayOfWeek"], levels=c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"))
 # The connection string
 conStr <- paste("Driver={ODBC Driver 13 for SQL Server};Server=.;Database=RevoTestDB;",
                 "Trusted_Connection=Yes;", sep = "")
 # The compute context
 computeContext <- RxInSqlServer(numTasks=4, connectionString=conStr)
 mm <- rxReadObject(as.raw(model_param))
 # Predict
 result <- rxPredict(modelObject = mm,
                     data = indata,
                     outData = NULL,
                     predVarNames = predVarName,
                     extraVarsToWrite = c("ArrDelay"),
                     writeModelVars = TRUE,
                     overwrite = TRUE)
}
# connections string
conStr <- paste0("Driver={ODBC Driver 13 for SQL Server};Server=.;Database=RevoTestDB;",
                "Trusted_Connection=Yes;")
# create InpuData Object for an input parameter that is a data frame
id <- InputData(name = "indata", defaultQuery = "SELECT * from cleanData")
# InputParameter for the model_param input variable
model <- InputParameter("model_param", "raw",
                       defaultQuery =
                         "select top 1 value from rdata where [key] = 'linmod.v1'")
# InputParameter for the predVarName variable
name <- InputParameter("predVarName", "character", value = "ArrDelayEstimate")
sp_df_df <- StoredProcedure(score1, "sTest", id, model, name,
                       filePath = ".")
## End(Not run)

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