R help - Jul 2021 - R Function question, (repost to fix the messy work format)

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 at 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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Modify the summ() function to start like this

summ <- function(Tabname){
   query <- sprintf(" SELECT * FROM %s",Tabname)
  res <- dbGetQuery(con, query)

etc

HTH,
Eric

On Fri, Jul 2, 2021 at 9:39 PM Kai Yang via R-help <r-help at
r-project.org>
wrote:
> 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 at 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
>
>
>         [[alternative HTML version deleted]]
>
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