[R] R Function question, (repost to fix the messy work format)

[Kai Yang]

Hello List,

The previous post look massy. I repost my question. Sorry,


I need to generate summary report for many tables (>200 tables). For each table, I can use the script to generate report:
res <- dbGetQuery(con, "SELECT * FROM BIODBX.MECCUNIQUE2")
view(dfSummary(res), file = "W:/project/_Joe.B/MSSQL/try/summarytools.BIODBX.MECCUNIQUE2.html")
rm(res)
BIODBX.MECCUNIQUE2 is the name of table.

I have all of tables' name in a data frame. So, I'm trying to write a function to do this:
summ <- function(Tabname){
  res <- dbGetQuery(con, "SELECT * FROM Tabname")
  view(dfSummary(res), file = "W:/project/_Joe.B/MSSQL/try/summarytools.Tabname.html")
  rm(res)
}
for (i in dbtable$Tot_table)
{
  Tabname <- as.character(sqldf(sprintf("SELECT Tot_table FROM dbtable", i)))
  summ(Tabname)
}

1. I created  a function summ, the argument is Tabname. I put the Tabname in the function. I hope it can be replaced one by one
2. the table dbtable contents all tables' name (>200 rows), the field name is Tot_table
3. I want use "for" to establish a loop, which can automatic generate a summary report for each table

but I got error message below:
 Error: nanodbc/nanodbc.cpp:1655: 42000: [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Invalid object name 'Tabname'.  
[Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Statement(s) could not be prepared. 

<SQL> 'SELECT * FROM Tabname' 
10. stop(structure(list(message = "nanodbc/nanodbc.cpp:1655: 42000: [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Invalid 
object name 'Tabname'.  [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Statement(s) could not be prepared. \n<SQL> 
'SELECT * FROM Tabname'", 
    call = NULL, cppstack = NULL), class = c("odbc::odbc_error", 
"C++Error", "error", "condition"))) 
9.new_result(connection using ptr, statement, immediate) 
8.OdbcResult(connection = conn, statement = statement, params = params,     immediate = immediate) 
7..local(conn, statement, ...) 
6.dbSendQuery(conn, statement, params = params, ...) 
5.dbSendQuery(conn, statement, params = params, ...) 
4..local(conn, statement, ...) 
3.dbGetQuery(con, "SELECT * FROM Tabname") 
2.dbGetQuery(con, "SELECT * FROM Tabname") 
1.summ(Tabname) 

it seems the tables' name is not successfully pass into query. can someone give me an instruction for this?
many thanks,
Kai


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