Created
December 29, 2021 15:16
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GetSqlQuery <- function(SQL_QUERY_FILEPATH, | |
DEBUG = TRUE){ | |
if(DEBUG) message("GetSqlQuery: Script Initialized \n") | |
FUNCTION_OUTPUT <- list() | |
con = file(SQL_QUERY_FILEPATH, "r") | |
sql_string <- "" | |
if(DEBUG) message("GetSqlQuery: Import SQL query \n") | |
while(TRUE){ | |
line <- readLines(con, n = 1) | |
if(length(line) == 0){ | |
break | |
} | |
line <- gsub("\\t", " ", line) | |
if(grepl("--",line) == TRUE){ | |
line <- paste(sub("--","/*",line),"*/") | |
} | |
sql_string <- paste(sql_string, line) | |
} | |
FUNCTION_OUTPUT[["SQL_FILEPATH"]] <- SQL_QUERY_FILEPATH | |
if(DEBUG) message("GetSqlQuery: Collecting final output \n") | |
FUNCTION_OUTPUT[["SQL_STRING"]] <- sql_string | |
if(nchar(sql.string) >= 10){ | |
if(DEBUG) message("GetSqlQuery: SQL string acquisition completed \n") | |
return(FUNCTION_OUTPUT) | |
} else { | |
stop("GetSqlQuery: Empty SQL string returned \n") | |
} | |
} | |
GetSqlData <- function(DRIVER = "SQL Server", | |
SERVER = "sdl02-vm161", | |
DB_NAME = "OpsDW", | |
QUERY_PATH = NULL, | |
DEBUG = TRUE){ | |
if(DEBUG) message("GetSqlData: Function Initialized \n") | |
if(!is.null(QUERY_PATH)){ | |
stop("GetSqlData: SQL Query path is missing \n") | |
} | |
start_time = Sys.time() | |
FUNCTION_OUTPUT <- list() | |
if(DEBUG) message("GetSqlData: Connect to database \n") | |
con = dbConnect(odbc(), | |
Driver = DRIVER, | |
Server = SERVER, | |
Database = DB_NAME, | |
Trusted_Connection = "True") | |
if(DEBUG) message("GetSqlData: Get SQL query \n") | |
which_query <- GET_SQL_QUERY(QUERY_PATH, | |
DEBUG = TRUE) | |
if(DEBUG) message("GetSqlData: Pull data from database \n") | |
temp <- dbSendQuery(con, which_query[["SQL_String"]]) | |
query_dat <- dbFetch(temp) | |
elapsed_time <- Sys.time() - start_time | |
FUNCTION_OUTPUT[["DRIVER"]] <- DRIVER | |
FUNCTION_OUTPUT[["SERVER"]] <- SERVER | |
FUNCTION_OUTPUT[["DB_NAME"]] <- DB_NAME | |
FUNCTION_OUTPUT[["QUERY_PATH"]] <- QUERY_PATH | |
FUNCTION_OUTPUT[["QUERY_TEXT"]] <- which_query[["SQL_STRING"]] | |
FUNCTION_OUTPUT[["ELAPSED_TIME"]] <- elapsed_time | |
if(DEBUG) message("GetSqlData: Collecting final output \n") | |
FUNCTION_OUTPUT[["FULL_DATA"]] <- query_dat | |
if(!is.null(query_dat) || !nrow(query_dat) == 0){ | |
if(DEBUG) message("GetSqlData: Data acquisition completed \n") | |
return(FUNCTION_OUTPUT) | |
} else { | |
stop("GetSqlData: Query returned an empty data set. \n") | |
} | |
close(con) | |
} | |
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