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getInputParameters: obtención de una lista de parámetros de entrada de un procedimiento almacenado de SQL

  • Artículo

getInputParameters: devuelve una lista de objetos de parámetro de SQL Server que describe los parámetros de entrada asociados con un procedimiento almacenado

Uso

  getInputParameters(sqlSP)

Argumentos

sqlSP

Un objeto StoredProcedure válido

Value

Lista con nombre de objetos de parámetro de SQL Server (InputData, InputParameter) asociados con el objeto StoredProcedure proporcionado. Los nombres son los nombres de las variables de la función de R que se proporciona en StoredProcedure asociado con los objetos

Ejemplos


 ## 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")
 sp_df_df <- StoredProcedure(score1, "sTest", id, model, name,
                         filePath = ".")

 # inspect the input parameters
 getInputParameters(sp_df_df)  # "model_param" "predVarName" "indata"

 # register the stored procedure with a database
 registerStoredProcedure(sp_df_df, conStr)
 # assign a different query to the InputData so that it only uses the firt 10 rows
 id <- setInputDataQuery(id, "SELECT top 10 * from cleanData")
 # assign a value to the name parameter
 name <- setInputParameterValue(name, "ArrDelayEstimate")
 # execute the stored procedure
 model <- executeStoredProcedure(sp_df_df, id, name, connectionString = conStr)
 model$data
## End(Not run)