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# file RODBC/R/sql.R
# copyright (C) 1999-2009 M. Lapsley and B. D. Ripley
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 or 3 of the License
# (at your option).
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# A copy of the GNU General Public License is available at
# http://www.r-project.org/Licenses/
#
# high level functions for sql database access
#
###########################################
sqlClear <- function(channel, sqtable, errors = TRUE)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(missing(sqtable)) stop("missing argument 'sqtable'")
dbname <- odbcTableExists(channel, sqtable, abort = errors)
if(!length(dbname)) {
if(errors) stop("table ", sQuote(sqtable), " not found");
return(invisible(-1L));
}
res <- sqlQuery(channel, paste ("TRUNCATE TABLE", dbname), errors = errors)
## res <- sqlQuery(channel, paste ("DELETE FROM", dbname), errors = errors)
if(errors &&
(!length(res) || identical(res, "No Data") )) invisible()
else invisible(res)
}
sqlDrop <- function(channel, sqtable, errors = TRUE)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(missing(sqtable)) stop("missing argument 'sqtable'")
dbname <- odbcTableExists(channel, sqtable, abort = errors)
if(!length(dbname)) {
if(errors) stop("table ", sQuote(sqtable), " not found");
return(invisible(-1L));
}
res <- sqlQuery(channel, paste ("DROP TABLE", dbname), errors = errors)
## Windows and SQLite were returning character(0)
if(errors &&
(!length(res) || identical(res, "No Data") )) invisible()
else invisible(res)
}
sqlFetch <-
function (channel, sqtable, ..., colnames = FALSE, rownames = TRUE)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(missing(sqtable)) stop("missing argument 'sqtable'")
dbname <- odbcTableExists(channel, sqtable)
DBMS <- odbcGetInfo(channel)[1L]
ans <- sqlQuery(channel, paste("SELECT * FROM", dbname), ...)
if(is.data.frame(ans)) {
if(is.logical(colnames) && colnames) {
colnames(ans) <- as.character(as.matrix(ans[1L, ]))
ans <- ans[-1L, ]
}
## FIXME case-mangling?
if(is.logical(rownames) && rownames) rownames <- "rownames"
if(is.character(rownames)) {
cn <- names(ans)
if (!is.na(rn <- match(rownames, cn))) {
row.names(ans) <- as.character(ans[, rn])
ans <- ans[, -rn, drop = FALSE]
}
}
}
ans
}
sqlFetchMore <-
function (channel, ..., colnames = FALSE, rownames = TRUE)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
ans <- sqlGetResults(channel, ...)
if(is.data.frame(ans)) {
if(is.logical(colnames) && colnames) {
colnames(ans) <- as.character(as.matrix(ans[1L, ]))
ans <- ans[-1L, ]
}
## FIXME case-mangling?
if(is.logical(rownames) && rownames) rownames <- "rownames"
if(is.character(rownames)) {
cn <- names(ans)
if (!is.na(rn <- match(rownames, cn))) {
row.names(ans) <- as.character(ans[, rn])
ans <- ans[, -rn, drop = FALSE]
}
}
}
ans
}
sqlCopy <-
function(channel, query, destination, destchannel = channel,
verbose = FALSE, errors = TRUE, ...)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(!odbcValidChannel(destchannel))
stop("destination argument is not an open RODBC channel")
if( missing(query) || missing(destination))
stop("missing parameter")
if(length(destination) != 1L)
stop("destination should be a name")
dataset <- sqlQuery(channel, query, errors = errors)
sqlSave(destchannel, dataset, destination, verbose=verbose, ...)
}
sqlCopyTable <-
function (channel, srctable, desttable, destchannel = channel,
verbose = FALSE, errors = TRUE)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(!odbcValidChannel(destchannel))
stop("destination argument is not an open RODBC channel")
if(missing(srctable) || missing(desttable))
stop("missing parameter")
dtablename <- as.character(desttable)
if(length(dtablename) != 1L)
stop(sQuote(dtablename), " should be a name")
stablename <- as.character(srctable)
if(!length(odbcTableExists(channel, stablename, abort = errors)))
return(invisible(-1L));
query <- sqltablecreate(channel, dtablename,
coldata = sqlColumns(channel, stablename),
keys = sqlPrimaryKeys(channel, stablename))
if(verbose) cat("Query: ", query, "\n", sep = "")
sqlQuery(destchannel, query, errors=errors)
}
######################################################
# sqlSave
# save into table if exists
# if table not compatible delete it
# create new table.
sqlSave <-
function(channel, dat, tablename = NULL, append = FALSE, rownames = TRUE,
colnames = FALSE, verbose = FALSE,
safer = TRUE, addPK = FALSE, typeInfo, varTypes,
fast = TRUE, test = FALSE, nastring = NULL)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(missing(dat))
stop("missing parameter")
if(!is.data.frame(dat))
stop("should be a data frame")
if(is.null(tablename))
tablename <- if(length(substitute(dat)) == 1)
as.character(substitute(dat))
else
as.character(substitute(dat)[[2L]])
if(length(tablename) != 1L)
stop(sQuote(tablename), " should be a name")
switch(attr(channel, "case"),
nochange = {},
toupper={tablename <- toupper(tablename)
colnames(dat) <- toupper(colnames(dat))},
tolower={tablename <- tolower(tablename)
colnames(dat) <- tolower(colnames(dat))}
)
keys <- -1
## move row labels into data frame
## FIXME case-mangling?
if(is.logical(rownames) && rownames) rownames <- "rownames"
if(is.character(rownames)) {
dat <- cbind(row.names(dat), dat)
names(dat)[1L] <- rownames
if(addPK) {
keys <- vector("list", 4L)
keys[[4L]] <- rownames
}
}
## ? move col names into dataframe (needed to preserve case)
if(is.logical(colnames) && colnames) {
## this is to deal with type conversions
as.data.frame(rbind(colnames(dat), as.matrix(dat)))->dat
}
## find out if table already exists
dbname <- odbcTableExists(channel, tablename, abort = FALSE)
if(length(dbname)) {
if(!append) {
if(safer) stop("table ", sQuote(tablename), " already exists")
## zero table, return if no perms
query <- paste ("DELETE FROM", dbname)
if(verbose) cat("Query: ", query, "\n", sep = "")
res <- sqlQuery(channel, query, errors = FALSE)
if(is.numeric(res) && res == -1L) # No Data is fine
stop(paste(odbcGetErrMsg(channel), collapse="\n"))
}
if(sqlwrite(channel, tablename, dat, verbose=verbose, fast=fast,
test=test, nastring=nastring) == -1) {
##cannot write: try dropping table
query <- paste("DROP TABLE", dbname)
if(verbose) {
cat("sqlwrite returned ", odbcGetErrMsg(channel),
"\n", sep = "\n")
cat("Query: ", query, "\n", sep = "")
}
if(safer) stop("unable to append to table ", sQuote(tablename))
res <- sqlQuery(channel, query, errors = FALSE)
if(is.numeric(res) && res == -1L) # No Data is fine
stop(paste(odbcGetErrMsg(channel), collapse="\n"))
} else { #success
return (invisible(1L))
}
}
# we get here if:
# - no table
# - table with invalid columns
# No permissions for existing table should have aborted above
types <- sapply(dat, typeof)
facs <- sapply(dat, is.factor)
isreal <- (types == "double")
isint <- (types == "integer") & !facs
islogi <- (types == "logical")
colspecs <- rep("varchar(255)", length(dat))
if(!missing(typeInfo) ||
!is.null(typeInfo <- typesR2DBMS[[odbcGetInfo(channel)[1L]]])) {
colspecs <- rep(typeInfo$character[1L], length(dat))
colspecs[isreal] <- typeInfo$double[1L]
colspecs[isint] <- typeInfo$integer[1L]
colspecs[islogi] <- typeInfo$logical[1L]
} else {
typeinfo <- sqlTypeInfo(channel, "all", errors = FALSE)
if(is.data.frame(typeinfo)) {
## Now change types as appropriate.
if(any(isreal)) {
realinfo <- sqlTypeInfo(channel, "double")[, 1L]
if(length(realinfo) > 0L) {
if(length(realinfo) > 1L) { # more than one match
nm <- match("double", tolower(realinfo))
if(!is.na(nm)) realinfo <- realinfo[nm]
}
colspecs[isreal] <- realinfo[1L]
} else {
realinfo <- sqlTypeInfo(channel, "float")[, 1L]
if(length(realinfo) > 0L) {
if(length(realinfo) > 1L) { # more than one match
nm <- match("float", tolower(realinfo))
if(!is.na(nm)) realinfo <- realinfo[nm]
}
colspecs[isreal] <- realinfo[1L]
}
}
}
if(any(isint)) {
intinfo <- sqlTypeInfo(channel, "integer")[, 1L]
if(length(intinfo) > 0L) {
if(length(intinfo) > 1) { # more than one match
nm <- match("integer", tolower(intinfo))
if(!is.na(nm)) intinfo <- intinfo[nm]
}
colspecs[isint] <- intinfo[1L]
}
}
}
}
names(colspecs) <- names(dat)
if(!missing(varTypes)) {
if(!length(nm <- names(varTypes)))
warning("argument 'varTypes' has no names and will be ignored")
OK <- names(colspecs) %in% nm
colspecs[OK] <- varTypes[names(colspecs)[OK]]
notOK <- !(nm %in% names(colspecs))
if(any(notOK))
warning("column(s) ", paste(nm[notOK], collapse=", "),
" 'dat' are not in the names of 'varTypes'")
}
## CREATE TABLE does not allow sheet names, so cannot make an
## exception for Excel here
query <- sqltablecreate(channel, tablename, colspecs = colspecs,
keys = keys)
if(verbose) cat("Query: ", query, "\n", sep = "")
##last chance: let it die if fails
res <- sqlQuery(channel, query, errors = FALSE)
if(is.numeric(res) && res == -1) # No Data is fine
stop(paste(odbcGetErrMsg(channel), collapse="\n"))
if(sqlwrite(channel, tablename, dat, verbose=verbose, fast=fast,
test=test, nastring=nastring) < 0) {
err <- odbcGetErrMsg(channel)
msg <- paste(err, collapse="\n")
if("missing column name" %in% err)
msg <- paste(msg,
"Check case conversion parameter in odbcConnect",
sep="\n")
stop(msg)
}
invisible(1L)
}
mangleColNames <- function(colnames) gsub("[^[:alnum:]_]+", "", colnames)
quoteColNames <- function(channel, colnames)
{
quotes <- attr(channel, "colQuote")
if(length(quotes) >= 2L)
paste(quotes[1L], colnames, quotes[2L], sep="")
else if(length(quotes) == 1L)
paste(quotes, colnames, quotes, sep="")
else colnames
}
quoteTabNames <- function(channel, tablename)
{
if(attr(channel, "interpretDot") &&
grepl(".", tablename, fixed = TRUE)) return(tablename)
quotes <- attr(channel, "tabQuote")
if(length(quotes) >= 2L)
paste(quotes[1L], tablename, quotes[2L], sep="")
else if(length(quotes) == 1L)
paste(quotes, tablename, quotes, sep="")
else tablename
}
################################################
# utility function
# write to table with name data
##############################################
sqlwrite <-
function (channel, tablename, mydata, test = FALSE, fast = TRUE,
nastring = NULL, verbose = FALSE)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
colnames <- as.character(sqlColumns(channel, tablename)[4L][, 1L])
## match the transform in tablecreate (get rid of invalid chars in col names)
colnames <- mangleColNames(colnames)
cnames <- paste(quoteColNames(channel, colnames), collapse = ", ")
dbname <- quoteTabNames(channel, tablename)
if(!fast) {
## this doesn't do a good enough job with logicals.
for(i in seq_along(mydata))
if(is.logical(mydata[[i]])) mydata[[i]] <- as.character(mydata[[i]])
data <- as.matrix(mydata)
if(nchar(enc<- attr(channel, "encoding")) && is.character(data))
data <- iconv(data, to = enc)
colnames(data) <- colnames
## quote character and date columns
cdata <- sub("\\([[:digit:]]*\\)", "",
sqlColumns(channel, tablename)[, "DATA_TYPE"])
tdata <- sqlTypeInfo(channel)
nr <- match(cdata, tdata[, 2L])
tdata <- as.matrix(tdata[nr, 4:5])
## quote all unkown types.
tdata[is.na(nr), ] <- "'"
for(cn in seq_along(cdata)) {
td <- as.vector(tdata[cn,])
if(is.na(td[1L])) next
if(identical(td, rep("'", 2L)))
data[, cn] <- gsub("'", "''", data[, cn])
data[, cn] <- paste(td[1L], data[, cn], td[2L], sep = "")
}
data[is.na(mydata)] <- if(is.null(nastring)) "NULL" else nastring[1L]
for (i in 1L:nrow(data)) {
query <- paste("INSERT INTO", dbname, "(", cnames,
") VALUES (",
paste(data[i, colnames], collapse = ", "),
")")
if(verbose) cat("Query: ", query, "\n", sep = "")
if(odbcQuery(channel, query) < 0) return(-1L)
}
} else {
query <- paste("INSERT INTO", dbname, "(", cnames, ") VALUES (",
paste(rep("?", ncol(mydata)), collapse=","), ")")
if(verbose) cat("Query: ", query, "\n", sep = "")
coldata <- sqlColumns(channel, tablename)[c(4L,5L,7L,9L)]
if(any(is.na(m <- match(colnames, coldata[, 1])))) return(-1L)
## sometimes drivers get this wrong e.g. sqliteodbc
if(any(notOK <- (coldata[,3L] == 0L))) {
types <- coldata[notOK, 2]
tdata <- sqlTypeInfo(channel)
coldata[notOK, 3L] <- tdata[match(types, tdata[, 2L]), 3L]
}
if(odbcUpdate(channel, query, mydata, coldata[m, ],
test = test, verbose = verbose,
nastring = nastring) < 0) return(-1L)
}
return(invisible(1L))
}
#
# Generate create statement
# parameter coldata is output from sqlColumns
# parameter keys is output from sqlPrimaryKeys (and might be -1)
# NB: some systems do not support sqlPKs
##############################################
sqltablecreate <-
function (channel, tablename, coldata = NULL, colspecs, keys = -1)
{
create <- paste("CREATE TABLE", quoteTabNames(channel, tablename), " (")
if(!is.null(coldata)) { # called from sqlCopyTable
j <- nrow(coldata)
colnames <- as.character(coldata[, 4L])
for (i in 1L:j) {
## 4 =rowname, 6 coltype, 7 col size, 11 ? nullable
if(coldata[i, 11] == 1) {
null <- " NULL"
null <- "" # Kludge for Oracle till bug fixed
} else {
null <- " NOT NULL"
}
colsize <- if(coldata[i, 7L] == 65535) " " else paste("(", coldata[i,7], ") ", sep="")
create <- paste(create,
quoteColNames(channel, mangleColNames(colnames[i])),
" ", coldata[i, 6L], colsize, null, sep="")
if(!is.numeric(keys)) {
if(as.character(keys[[4L]]) == colnames[i])
create <- paste(create, "PRIMARY KEY")
}
if(i < j) create <- paste(create, ", ")
}
} else { # called from sqlSave
colnames <- quoteColNames(channel, mangleColNames(names(colspecs)))
entries <- paste(colnames, colspecs)
if(is.list(keys)) {
keyname <- as.character(keys[[4L]])
key <- match(keyname, names(colspecs))
entries[key] <- paste(entries[key], "NOT NULL PRIMARY KEY")
}
create <- paste(create, paste(entries, collapse = ", "), sep="")
}
create <- paste(create, ")", sep="")
create
}
###############################################
#
##### Query Functions
# Return a data frame according to as.is
#
###############################################
sqlTables <- function(channel, errors = FALSE, as.is = TRUE,
catalog = NULL, schema = NULL,
tableName = NULL, tableType = NULL, literal = FALSE)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
stat <- odbcTables(channel, catalog = catalog, schema = schema,
tableName = tableName, tableType = tableType,
literal = literal)
if(stat < 0L) {
if(errors) {
if(stat == -2L) stop("invalid channel")
else return(odbcGetErrMsg(channel))
} else return(invisible(-1L))
} else return(sqlGetResults(channel, as.is = as.is))
}
sqlColumns <-
function (channel, sqtable, errors = FALSE, as.is = TRUE, special = FALSE,
catalog = NULL, schema = NULL, literal = FALSE)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(length(sqtable) != 1)
stop(sQuote(sqtable), " should be a name")
if(is.null(catalog) && is.null(schema)) {
dbname <- odbcTableExists(channel, sqtable, FALSE, FALSE)
if(!length(dbname)) {
caseprob <- ""
if(is.data.frame(nm <- sqlTables(channel)) &&
tolower(sqtable) %in% tolower(nm[,3]))
caseprob <- "\nCheck case parameter in odbcConnect"
stop(sQuote(sqtable), ": table not found on channel", caseprob)
}
if(grepl(".", dbname, fixed = TRUE)) {
parts <- strsplit(dbname, ".", fixed = TRUE)[[1]]
if(length(parts) > 2) stop("dot.dot.dot names are not supported")
if(attr(channel, "isMySQL")) {
## This does not work for current drivers
catalog <- parts[1]
dbname <- parts[2]
} else {
schema <- parts[1]
dbname <- parts[2]
}
}
} else
dbname <- switch(attr(channel, "case"),
nochange = sqtable, toupper = toupper(sqtable),
tolower = tolower(sqtable))
stat <- if(special)
odbcSpecialColumns(channel, dbname, catalog, schema)
else odbcColumns(channel, dbname, catalog, schema, literal)
if(stat < 0L) {
if(errors) {
if(stat == -2L) stop("invalid channel")
else return(odbcGetErrMsg(channel))
} else return(invisible(-1L))
} else return(sqlGetResults(channel, as.is = as.is))
}
sqlPrimaryKeys <-
function(channel, sqtable, errors = FALSE, as.is = TRUE,
catalog = NULL, schema = NULL)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(length(sqtable) != 1)
stop(sQuote(sqtable), " should be a name")
if(is.null(catalog) && is.null(schema)) {
dbname <- odbcTableExists(channel, sqtable, FALSE, FALSE)
if(!length(dbname)) {
caseprob <- ""
if(is.data.frame(nm <- sqlTables(channel)) &&
tolower(sqtable) %in% tolower(nm[, 3L]))
caseprob <- "\nCheck case parameter in odbcConnect"
stop(sQuote(sqtable), ": table not found on channel", caseprob)
}
if(grepl(".", dbname, fixed = TRUE)) {
parts <- strsplit(dbname, ".", fixed = TRUE)[[1]]
if(length(parts) > 2) stop("dot.dot.dot names are not supported")
if(attr(channel, "isMySQL")) {
## This does not work for current drivers
catalog <- parts[1]
dbname <- parts[2]
} else {
schema <- parts[1]
dbname <- parts[2]
}
}
} else
dbname <- switch(attr(channel, "case"),
nochange = sqtable, toupper = toupper(sqtable),
tolower = tolower(sqtable))
stat <- odbcPrimaryKeys(channel, dbname, catalog, schema)
if(stat < 0L) {
if(errors) {
if(stat == -2L) stop("invalid channel")
else return(odbcGetErrMsg(channel))
} else return(invisible(-1L))
} else return(sqlGetResults(channel, as.is = as.is))
}
sqlQuery <-
function(channel, query, errors = TRUE, ..., rows_at_time)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(missing(query))
stop("missing argument 'query'")
## could argue that 'max' should restrict rows_at_time
rows_at_time <- if(missing(rows_at_time)) attr(channel, "rows_at_time")
else max(1, min(1024, rows_at_time))
stat <- odbcQuery(channel, query, rows_at_time)
if(stat == -1L) {
if(errors) return(odbcGetErrMsg(channel))
else return(invisible(stat))
} else return(sqlGetResults(channel, errors = errors, ...))
}
sqlGetResults <-
function (channel, as.is = FALSE,
errors = FALSE, max = 0, buffsize = 1000,
nullstring = NA_character_, na.strings = "NA",
believeNRows = TRUE, dec = getOption("dec"),
stringsAsFactors = default.stringsAsFactors())
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
as.df <- function(value, colnames) {
for(i in seq_along(value))
if(is.list(value[[i]])) class(value[[i]]) <- "ODBC_binary"
## convert list to data frame
class(value) <- "data.frame"
names(value) <- make.unique(colnames)
row.names(value) <- seq(along=value[[1L]])
value
}
cols <- .Call(C_RODBCNumCols, attr(channel, "handle_ptr"))
## FIXME: should this be <= 0L?
if(cols < 0L) {
if(errors) return("No data")
else return(invisible(-1L))
}
cData <- .Call(C_RODBCColData, attr(channel, "handle_ptr"))
dbdata <- odbcFetchRows(channel,
max = max,
buffsize = buffsize,
nullstring = nullstring,
believeNRows = believeNRows)
if(dbdata$stat < 0L) {
if(errors) return(odbcGetErrMsg(channel))
else return(invisible(dbdata$stat))
}
data <- as.df(dbdata$data, cData$names)
if(nrow(data) > 0L) {
cols <- ncol(data)
enc <- attr(channel, "encoding")
if(length(na.strings))
for (i in 1L:cols)
if(is.character(data[,i]))
data[data[,i] %in% na.strings, i] <- NA
if(is.logical(as.is)) {
as.is <- rep(as.is, length = cols)
} else if(is.numeric(as.is)) {
if(any(as.is < 1 | as.is > cols))
stop("invalid numeric 'as.is' expression")
i <- rep(FALSE, cols)
i[as.is] <- TRUE
as.is <- i
} else if(length(as.is) != cols)
stop("'as.is' has the wrong length ", length(as.is),
" != cols = ", cols)
for (i in seq_len(cols)) {
if(is.character(data[[i]]) && nchar(enc))
data[[i]] <- iconv(data[[i]], from = enc)
if(as.is[i] || is.list(data[[i]])) next
if(is.numeric(data[[i]])) next
if(cData$type[i] == "date")
data[[i]] <- as.Date(data[[i]])
else if(cData$type[i] == "timestamp")
data[[i]] <- as.POSIXct(data[[i]])
else
data[[i]] <- type.convert(as.character(data[[i]]),
as.is = !stringsAsFactors,
dec = dec)
}
}
data
}
format.ODBC_binary <- print.ODBC_binary <- function(x, ...)
sapply(x, function(x) paste(as.character(x), collapse=""))
#################################################
sqlUpdate <-
function(channel, dat, tablename = NULL, index = NULL,
verbose = FALSE, test = FALSE,
nastring = NULL, fast = TRUE)
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(missing(dat)) stop("missing parameter")
if(!is.data.frame(dat)) stop("should be a data frame or matrix")
if(is.null(tablename))
tablename <- if(length(substitute(dat)) == 1L)
as.character(substitute(dat))
else
as.character(substitute(dat)[[2L]])
if(length(tablename) != 1L)
stop(sQuote(tablename), " should be a name")
dbname <- odbcTableExists(channel, tablename)
## test for missing values.
cnames <- colnames(dat)
## match the transform in tablecreate (get rid of inval chars in col names)
cnames <- mangleColNames(cnames)
cnames <- switch(attr(channel, "case"),
nochange = cnames,
toupper = toupper(cnames),
tolower = tolower(cnames))
## get the column descriptor data for the rest of the table.
## This may or may not include the unique column depending
## on whether or not it is a special column.
cdata <- sqlColumns(channel,tablename)
coldata <- cdata[c(4L,5L,7L,9L)]
if(is.character(index)) {
intable <- index %in% coldata[ ,1L]
if(any(!intable)) stop("index column(s) ",
paste(index[!intable], collapse=" "),
" not in database table")
intable <- index %in% cnames
if(any(!intable)) stop("index column(s) ",
paste(index[!intable], collapse=" "),
" not in data frame")
indexcols <- index
} else {
haveKey <- FALSE
## identify the column(s) that is a unique row specifier along with
## its descriptor data. First try a primary key
indexcols <- sqlPrimaryKeys(channel, tablename)
if(!(is.numeric(indexcols) || nrow(indexcols) == 0L)) {
## have primary key(s)
index <- as.character(indexcols[, 4L])
intable <- index %in% cnames
if(any(intable)) {
indexcols <- index[intable][1L]
haveKey <- TRUE
}
}
if(!haveKey){
## try special columns
indexcols <- sqlColumns(channel, tablename, special = TRUE)
if(!(is.numeric(indexcols) || nrow(indexcols) == 0L)) {
indexcols <- indexcols[c(2L,3L,5L,7L)]
## check that the unique column(s) are present in the dataframe
indexflags <- indexcols[, 1L] %in% cnames
if(all(indexflags)) {
## if a unique column is not in coldata bind it on
incoldata <- indexcols[, 1L] %in% coldata[, 1L]
if(any(!incoldata))
coldata <- rbind(coldata, indexcols[!incoldata])
indexcols <- as.character(indexcols[, 1L])
haveKey <- TRUE
}
}
}
if(!haveKey){
## can we use a column 'rownames' as index column?
m <- match("rownames", tolower(coldata[, 1L]))
if(is.na(m))
stop("cannot update ", sQuote(tablename),
" without unique column")
indexcols <- coldata[m, 1L]
dat <- cbind(row.names(dat), dat)
names(dat)[1L] <- indexcols
cnames <- c(indexcols, cnames)
}
}
## check that no columns are present in the df that are not in the table
intable <- cnames %in% coldata[, 1L]
if(any(!intable)) stop("data frame column(s) ",
paste(cnames[!intable], collapse=" "),
" not in database table")
cn1 <- cnames[!cnames %in% indexcols]
cn2 <- quoteColNames(channel, cn1)
if(fast) {
query <- paste("UPDATE", dbname, "SET")
query <- paste(query,
paste(paste(cn2, "=?", sep =""), collapse = ", "))
paramnames <- c(cn1, indexcols)
if (length(indexcols)) {
ind <- quoteColNames(channel, indexcols)
query <- paste(query, "WHERE",
paste(paste(ind, "=?", sep =""),
collapse = " AND "))
}
row.names(coldata) <- coldata[, 1L]
paramdata <- coldata[paramnames, ]
if(test | verbose) cat("Query: ", query, "\n", sep = "")
stat <- odbcUpdate(channel, query, dat, paramdata, test = test,
verbose = verbose, nastring = nastring)
} else {
data <- as.matrix(dat)
if(nchar(enc <- attr(channel, "encoding")) && is.character(data))
data[] <- iconv(data, to = enc)
## we might have mangled and case-folded names on the database.
colnames(data) <- cnames
## quote character etc columns
cdata <- sub("\\([[:digit:]]*\\)", "",
sqlColumns(channel, tablename)[, "TYPE_NAME"])
tdata <- sqlTypeInfo(channel)
tdata <- as.matrix(tdata[match(cdata, tdata[, 1]), c(4,5)])
for(cn in seq_along(cdata)) {
td <- as.vector(tdata[cn,])
if(is.na(td[1L])) next
if(identical(td, rep("'", 2L)))
data[, cn] <- gsub("'", "''", data[, cn])
data[, cn] <- paste(td[1L], data[, cn], td[2L], sep = "")
}
data[is.na(dat)] <- if(is.null(nastring)) "NULL" else nastring
for (i in 1L:nrow(data)) {
query <- paste("UPDATE", dbname, "SET")
query <- paste(query,
paste(paste(cn2, "=", data[i, cn1], sep =""),
collapse = ", "))
if (length(indexcols)) { # will always be true.
ind <- quoteColNames(channel, indexcols)
query <- paste(query, "WHERE",
paste(paste(ind, "=", data[i, indexcols], sep =""),
collapse = " AND "))
}
if(verbose) cat("Query: ", query, "\n", sep = "")
if((stat <- odbcQuery(channel, query)) < 0L) break
}
}
if(stat < 0L) stop(paste(odbcGetErrMsg(channel), sep="\n"))
invisible(stat)
}
odbcTableExists <- function(channel, tablename, abort = TRUE, forQuery = TRUE,
allowDot = attr(channel, "interpretDot"))
{
if(!odbcValidChannel(channel))
stop("first argument is not an open RODBC channel")
if(length(tablename) != 1)
stop(sQuote(tablename), " should be a name")
tablename <- as.character(tablename)
switch(attr(channel, "case"),
nochange = {},
toupper = tablename <- toupper(tablename),
tolower = tablename <- tolower(tablename)
)
isExcel <- odbcGetInfo(channel)[1L] == "EXCEL"
hasDot <- grepl(".", tablename, fixed = TRUE)
if(allowDot && hasDot) {
parts <- strsplit(tablename, ".", fixed = TRUE)[[1]]
## FIXME
if(length(parts) > 2) ans <- FALSE
else {
res <- if(attr(channel, "isMySQL"))
sqlTables(channel, catalog = parts[1], tableName = parts[2])
else
sqlTables(channel, schema = parts[1], tableName = parts[2])
ans <- is.data.frame(res) && nrow(res) > 0
}
} else if(!isExcel) {
## just ask about this name
res <- sqlTables(channel, tableName = tablename)
ans <- is.data.frame(res) && nrow(res) > 0
} else {
res <- sqlTables(channel)
tables <- stables <- if(is.data.frame(res)) res[, 3] else ""
## Excel appends a $ to worksheets, single-quotes non-standard names
if(isExcel) {
tables <- sub("^'(.*)'$", "\\1", tables)
tables <- unique(c(tables, sub("\\$$", "", tables)))
}
ans <- tablename %in% tables
}
if(abort && !ans)
stop(sQuote(tablename), ": table not found on channel")
enc <- attr(channel, "encoding")
if(nchar(enc)) tablename <- iconv(tablename, to = enc)
if(ans && isExcel) {
dbname <- if(tablename %in% stables) tablename else paste(tablename, "$", sep = "")
if(forQuery) paste("[", dbname, "]", sep="") else dbname
} else if(ans) {
## we don't in general want to quote dotted names
if(forQuery && !hasDot) quoteTabNames(channel, tablename) else tablename
} else character(0L)
}
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