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

Hello Eric,

Following your suggestion, I modified the code as:

summ <- function(Tabname){

  query <- sprintf(" SELECT * FROM %s",Tabname)

  res <- dbGetQuery(con, query)

  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)

}

after submitted the work, I got the error message below:


 Error: nanodbc/nanodbc.cpp:1655: 42000: [Microsoft][ODBC Driver 17 for
SQL Server][SQL Server]Invalid object name 'c'.  [Microsoft][ODBC Driver 17
for SQL Server][SQL Server]Statement(s) could not be prepared.
<SQL> ' SELECT * FROM c("BIODBX.MECCUNIQUE2", "BIODBX.QDATA_HTML_DUMMY",
"BIODBX.SET_ITEMS", "BIODBX.SET_NAMES", "dbo.sysdiagrams",
"GEMD.ASSAY_DEFINITIONS", "GEMD.ASSAY_DISCRETE_VALUES",
"GEMD.ASSAY_QUESTIONS", "GEMD.ASSAY_RUNS", "GEMD.BIODBX_DATABASE_SEED",
"GEMD.BIODBX_USER_SEEDS", "GEMD.BIODBX_USERS", "GEMD.DATA_ENTRY_PAGES",
"GEMD.DISC_SESSION_QID", "GEMD.DISC_SESSION_STATUS",
"GEMD.DISC_SESSION_TYPE", "GEMD.DISCREPANCIES",
"GEMD.DISCREPANCY_QUERY_TEMP", "GEMD.DISCRETE_VALUES",
"GEMD.ENTERED_DATA_ENTRY_PAGES", "GEMD.ENTRY_GROUPS",
"GEMD.ExportSampleListNames", "GEMD.FORM_STATUS_BY_SUBJECT",
"GEMD.GEMD_CODELIST_GROUPS", "GEMD.GEMD_CODELIST_VALUES",
"GEMD.GEMD_LOT_DEFINITIONS", "GEMD.GEMD_SAMPLES", "GEMD.GEMD_STUDIES",
"GEMD.MECCUNIQUE", "GEMD.MECCUNIQUE2", "GEMD.MISSING_DI


One more question,  in the code of "*view(dfSummary(res), file =
"W:/project/_Joe.B/MSSQL/try/summarytools.Tabname.html")*",

can Tabname part be replacted automatic also?

Thank you,

Kai
On Friday, July 2, 2021, 12:06:12 PM PDT, Eric Berger <
ericjberger at gmail.com> wrote:


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


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