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oci.R
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oci.R
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#
# Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.
#
# NAME
# oci.R - OCI based implementaion for DBI
#
# DESCRIPTION
# OCI based implementaion for DBI.
#
# NOTES
#
# MODIFIED (MM/DD/YY)
# ssjaiswa 08/25/16 - Handled upper and lower cases in ora.type,
# ora.parameter_mode and ora.encoding attributes
# accept both cases (upper and lower)
# ssjaiswa 05/12/16 - validate data of OUT parameter with NA
# ssjaiswa 03/10/16 - add .oci.oracleProc() for stored procedure/function
# ssjaiswa 03/08/16 - copying attributes back to object after strftime,
# as.data.frame, strptime and as.difftime strips them
# rpingte 06/14/15 - [21128853] performance improvements for date time
# types
# ssjaiswa 04/29/15 - [20964968] copying attributes back to object after
# as.character() strips them
# rpingte 03/31/15 - add ora.attributes
# rpingte 03/30/15 - remove attrib from ListFields
# ssjaiswa 03/23/15 - [16017358] add .oci.Connect(), .oci.GetQuery() and
# .oci.SendQuery() parameters validation
# ssjaiswa 03/22/15 - [15937661] [20603162] add attribute support
# rpingte 02/16/15 - add attribute support
# rpingte 01/29/15 - add unicode_as_utf8 parameter to dbDriver
# ssjaiswa 12/16/14 - [16907374] Add date argument in .oci.WriteTable
# ssjaiswa 09/10/14 - Add bulk_write
# rpingte 05/27/14 - use ORA_SDTZ to format binds
# rpingte 05/02/14 - Date and Time stamp(with zone and local) are
# internally defined as datetime class
# lzhang 03/20/14 - bug 18263136: for POSIXct with integer internal
# - type, convert to double internal first.
# rpingte 03/10/14 - add end of result
# rkanodia 10/03/13 - Add session mode
# rkanodia 08/30/13 - [17383542] Enhance .oci.WriteTable() to work on
# tables of global space
# qinwan 03/01/13 - avoid unnecessary data copy in type check
# rkanodia 12/10/12 - Changed default value of bulk_read to 1000
# rpingte 11/28/12 - 15930335: use timestamp data type for POSIXct value
# paboyoun 09/17/12 - add difftime support
# demukhin 09/04/12 - add Extproc driver
# rkanodia 08/02/12 - Removed redundant arguments passed to functions
# and removed LOB prefetch support bug [145082788888888]
# paboyoun 08/01/12 - optimize .oci.data.frame
# jfeldhau 06/18/12 - ROracle support for TimesTen.
# paboyoun 06/04/12 - add data.frame support for list of raw vectors
# rpingte 05/24/12 - Date time and raw support
# rkanodia 05/13/12 - LOB prefetch
# rkanodia 05/12/12 - Statement caching
# demukhin 05/10/12 - translation changes
# rpingte 04/23/12 - add interrupt enable
# rpingte 04/21/12 - add prefetch & array fetch options
# rkanodia 04/16/12 - Fixing review comments
# demukhin 04/09/12 - translation
# paboyoun 03/22/12 - fix typo
# rkanodia 03/05/12 - obs2 bugfix (13843807)
# rkanodia 03/05/12 - obs1_bugfix (13843805)
# demukhin 01/20/12 - cleanup
# paboyoun 01/04/12 - minor code cleanup
# demukhin 12/08/11 - more OraConnection and OraResult methods
# demukhin 12/01/11 - add support for more methods
# paboyoun 11/30/11 - don't check column names in oraWriteTable
# demukhin 10/12/11 - creation
#
###############################################################################
## (*) OraDriver ##
###############################################################################
.oci.Driver <- function(drv, interruptible = FALSE, extproc.ctx = NULL,
unicode_as_utf8 = TRUE, ora.attributes = FALSE)
{
.Call("rociDrvInit", drv@handle, interruptible, extproc.ctx, unicode_as_utf8,
ora.attributes, PACKAGE = "ROracle")
drv
}
.oci.UnloadDriver <- function(drv)
{
.Call("rociDrvTerm", drv@handle, PACKAGE = "ROracle")
TRUE
}
.oci.DriverInfo <- function(drv, what)
{
info <- .Call("rociDrvInfo", drv@handle, PACKAGE = "ROracle")
info$connections <- lapply(info$connections,
function(hdl) new("OraConnection", handle = hdl))
if (!missing(what))
info <- info[what]
info
}
.oci.DriverSummary <- function(drv)
{
info <- .oci.DriverInfo(drv)
cat("Driver name: ", info$driverName, "\n")
cat("Driver version: ", info$driverVersion, "\n")
cat("Client version: ", info$clientVersion, "\n")
cat("Connections processed: ", info$conTotal, "\n")
cat("Open connections: ", info$conOpen, "\n")
cat("Interruptible: ", info$interruptible, "\n")
cat("Unicode data as utf8: ", info$unicode_as_utf8, "\n")
cat("Oracle type attributes: ", info$ora_attributes, "\n")
invisible(info)
}
###############################################################################
## (*) OraConnection ##
###############################################################################
.oci.Connect <- function(drv, username = "", password = "", dbname = "",
prefetch = FALSE, bulk_read = 1000L,
bulk_write = 1000L, stmt_cache = 0L,
external_credentials = FALSE, sysdba = FALSE)
{
# validate if not ExtDriver
if (class(drv)[1] != "ExtDriver")
{
username <- as.character(username)
if (length(username) != 1L)
stop("'username' must be a single string")
password <- as.character(password)
if (length(password) != 1L)
stop("'password' must be a single string")
dbname <- as.character(dbname)
if (length(dbname) != 1L)
stop("'dbname' must be a single string")
}
else
{
if (!is.character(username) || nzchar(username))
stop("'username' must not given for ExtDriver")
if (!is.character(password) || nzchar(password))
stop("'password' must not be given for ExtDriver")
if (!is.character(dbname) || nzchar(dbname))
stop("'dbname' must not be given for ExtDriver")
}
if (!is.logical(prefetch))
stop(gettextf(
"argument '%s' must be a single logical value and cannot be '%s'",
"prefetch", prefetch))
prefetch <- as.logical(prefetch)
if (length(prefetch) != 1L)
stop(gettextf("argument '%s' must be a single logical value", "prefetch"))
if (!is.numeric(bulk_read))
stop(gettextf(
"argument '%s' must be a single integer value and cannot be '%s'",
"bulk_read", bulk_read))
bulk_read <- as.integer(bulk_read)
if (length(bulk_read) != 1L)
stop(gettextf("argument '%s' must be a single integer", "bulk_read"))
if (bulk_read < 1L)
stop(gettextf("argument '%s' must be greater than 0", "bulk_read"))
if (!is.numeric(bulk_write))
stop(
gettextf(
"argument '%s' must be a single integer value and cannot be '%s'",
"bulk_write", bulk_write))
bulk_write <- as.integer(bulk_write)
if (length(bulk_write) != 1L)
stop(gettextf("argument '%s' must be a single integer", "bulk_write"))
if (bulk_write < 1L)
stop(gettextf("argument '%s' must be greater than 0", "bulk_write"))
if (!is.integer(stmt_cache))
stop(gettextf(
"argument '%s' must be a single a single integer and cannot be '%s'",
"stmt_cache", stmt_cache))
stmt_cache <- as.integer(stmt_cache)
if (length(stmt_cache) != 1L)
stop(gettextf("argument '%s' must be a single integer", "stmt_cache"))
if (stmt_cache < 0L)
stop(gettextf("argument '%s' must be a positive integer", "stmt_cache"))
# Validate external_credentials parameter
if (!is.logical(external_credentials))
stop(gettextf(
"argument '%s' must be a single a single integer and cannot be '%s'",
"external_credentials", external_credentials))
external_credentials <- as.logical(external_credentials)
if (length(external_credentials) != 1L)
stop(gettextf("argument '%s' must be a single logical value",
"external_credentials"))
# Validate sysdba parameter
if (!is.logical(sysdba))
stop(gettextf(
"argument '%s' must be a single a single logical and cannot be '%s'",
"sysdba", sysdba))
sysdba <- as.logical(sysdba)
if (length(sysdba) != 1L)
stop(gettextf("argument '%s' must be a single logical value", "sysdba"))
# connect
params <- c(username, password, dbname)
hdl <- .Call("rociConInit", drv@handle, params, prefetch, bulk_read,
bulk_write, stmt_cache, external_credentials, sysdba,
PACKAGE = "ROracle")
timesten <- (.Call("rociConInfo", hdl,
PACKAGE = "ROracle")$serverType == "TimesTen IMDB")
new("OraConnection", handle = hdl, timesten = timesten)
}
.oci.Disconnect <- function(con)
{
.Call("rociConTerm", con@handle, PACKAGE = "ROracle")
TRUE
}
.oci.SendQuery <- function(con, stmt, data = NULL, prefetch = FALSE,
bulk_read = 1000L, bulk_write = 1000L)
{
#validate
if (!is.logical(prefetch))
stop(gettextf(
"argument '%s' must be a single logical value and cannot be '%s'",
"prefetch", prefetch))
prefetch <- as.logical(prefetch)
if (length(prefetch) != 1L)
stop(gettextf("argument '%s' must be a single logical value", "prefetch"))
if (!is.numeric(bulk_read))
stop(gettextf(
"argument '%s' must be a single integer value and cannot be '%s'",
"bulk_read", bulk_read))
bulk_read <- as.integer(bulk_read)
if (length(bulk_read) != 1L)
stop(gettextf("argument '%s' must be a single integer", "bulk_read"))
if (bulk_read < 1L)
stop(gettextf("argument '%s' must be greater than 0", "bulk_read"))
if (!is.numeric(bulk_write))
stop(
gettextf(
"argument '%s' must be a single integer value and cannot be '%s'",
"bulk_write", bulk_write))
bulk_write <- as.integer(bulk_write)
if (length(bulk_write) != 1L)
stop(gettextf("argument '%s' must be a single integer", "bulk_write"))
if (bulk_write < 1L)
stop(gettextf("argument '%s' must be greater than 0", "bulk_write"))
stmt <- as.character(stmt)
.oci.ValidateString("statement",stmt)
if (!is.null(data))
data <- .oci.data.frame(data, TRUE)
hdl <- .Call("rociResInit", con@handle, stmt, data, prefetch,
bulk_read, bulk_write, PACKAGE = "ROracle")
new("OraResult", handle = hdl)
}
.oci.oracleProc <- function(con, stmt, data = NULL, prefetch = FALSE,
bulk_read = 1000L, bulk_write = 1000L)
{
#validate
if (!is.logical(prefetch))
stop(gettextf(
"argument '%s' must be a single logical value and cannot be '%s'",
"prefetch", prefetch))
prefetch <- as.logical(prefetch)
if (length(prefetch) != 1L)
stop(gettextf("argument '%s' must be a single logical value", "prefetch"))
if (!is.numeric(bulk_read))
stop(gettextf(
"argument '%s' must be a single integer value and cannot be '%s'",
"bulk_read", bulk_read))
bulk_read <- as.integer(bulk_read)
if (length(bulk_read) != 1L)
stop(gettextf("argument '%s' must be a single integer", "bulk_read"))
if (bulk_read < 1L)
stop(gettextf("argument '%s' must be greater than 0", "bulk_read"))
if (!is.numeric(bulk_write))
stop(
gettextf(
"argument '%s' must be a single integer value and cannot be '%s'",
"bulk_write", bulk_write))
bulk_write <- as.integer(bulk_write)
if (length(bulk_write) != 1L)
stop(gettextf("argument '%s' must be a single integer", "bulk_write"))
if (bulk_write < 1L)
stop(gettextf("argument '%s' must be greater than 0", "bulk_write"))
stmt <- as.character(stmt)
.oci.ValidateString("statement",stmt)
if (!is.null(data))
{
data <- .oci.pls.data.frame(data, TRUE)
mode = attr(data, "ora.parameter_mode", exact=TRUE)
# verify ora.parameter_mode for data.frame
if (!is.null(mode))
{
mode <- toupper(mode)
attr(data, "ora.parameter_mode") <- mode
if ((mode != "IN") && (mode != "OUT") && (mode != "IN OUT"))
stop(gettextf("argument '%s' must be IN, OUT or IN OUT",
"ora.parameter_mode"))
else if ((mode == "OUT") && ((length(data) && !is.na(data)) || (is.raw(data) && length(data))))
stop(gettextf("argument '%s' must be NA for argument '%s' '%s'", "data",
"ora.parameter_mode", mode))
}
# verify maxlength for CLOB/BLOB/NCLOB
oratype = attr(data, "ora.type", exact=TRUE)
if (!is.null(oratype))
{
oratype <- tolower(oratype)
attr(data, "ora.type") <- oratype
maxlen = attr(data, "ora.maxlength", exact=TRUE)
if ((oratype == "clob") && !is.null(maxlen))
stop(gettextf("attribute '%s' must not be specified for CLOB", "ora.maxlength"))
else if ((oratype == "blob") && !is.null(maxlen))
stop(gettextf("attribute '%s' must not be specified for BLOB", "ora.maxlength"))
}
for (i in seq_len(ncol(data)))
{
col <- data[[i]]
mode <- attr(col, "ora.parameter_mode", exact=TRUE)
type <- attr(col, "ora.type", exact=TRUE)
if (!is.null(mode))
{
mode <- toupper(mode)
attr(data[[i]], "ora.parameter_mode") <- mode
if ((mode != "IN") && (mode != "OUT") && (mode != "IN OUT"))
stop(gettextf("argument '%s' must be IN, OUT or IN OUT",
"ora.parameter_mode"))
else if ((mode == "OUT") && ((length(col) && !is.na(col)) || (is.raw(data) && length(col))))
stop(gettextf("argument '%s' must be NA for argument '%s' '%s'", "data",
"ora.parameter_mode", mode))
}
if (!is.null(type))
{
type <- tolower(type)
attr(data[[i]], "ora.type") <- type
max = attr(col, "ora.maxlength", exact=TRUE)
if ((type == "clob") && !is.null(max))
stop(gettextf("attribute '%s' must not be specified for CLOB", "ora.maxlength"))
else if ((type == "blob") && !is.null(max))
stop(gettextf("attribute '%s' must not be specified for BLOB", "ora.maxlength"))
}
}
}
hdl <- .Call("rociResInit", con@handle, stmt, data,
prefetch, bulk_read, bulk_write, PACKAGE = "ROracle")
res <- try(
{
eof_res <- .Call("rociEOFRes", hdl, PACKAGE = "ROracle")
if (eof_res)
TRUE
else
.Call("rociResFetch", hdl, -1L, PACKAGE = "ROracle")
}, silent = TRUE)
.Call("rociResTerm", hdl, PACKAGE = "ROracle")
if (inherits(res, "try-error"))
stop(res)
res
}
.oci.GetQuery <- function(con, stmt, data = NULL, prefetch = FALSE,
bulk_read = 1000L, bulk_write = 1000L)
{
#validate
if (!is.logical(prefetch))
stop(gettextf(
"argument '%s' must be a single logical value and cannot be '%s'",
"prefetch", prefetch))
prefetch <- as.logical(prefetch)
if (length(prefetch) != 1L)
stop(gettextf("argument '%s' must be a single logical value", "prefetch"))
if (!is.numeric(bulk_read))
stop(gettextf(
"argument '%s' must be a single integer value and cannot be '%s'",
"bulk_read", bulk_read))
bulk_read <- as.integer(bulk_read)
if (length(bulk_read) != 1L)
stop(gettextf("argument '%s' must be a single integer", "bulk_read"))
if (bulk_read < 1L)
stop(gettextf("argument '%s' must be greater than 0", "bulk_read"))
if (!is.numeric(bulk_write))
stop(
gettextf(
"argument '%s' must be a single integer value and cannot be '%s'",
"bulk_write", bulk_write))
bulk_write <- as.integer(bulk_write)
if (length(bulk_write) != 1L)
stop(gettextf("argument '%s' must be a single integer", "bulk_write"))
if (bulk_write < 1L)
stop(gettextf("argument '%s' must be greater than 0", "bulk_write"))
stmt <- as.character(stmt)
.oci.ValidateString("statement",stmt)
if (!is.null(data))
data <- .oci.data.frame(data, TRUE)
hdl <- .Call("rociResInit", con@handle, stmt, data,
prefetch, bulk_read, bulk_write, PACKAGE = "ROracle")
res <- try(
{
eof_res <- .Call("rociEOFRes", hdl, PACKAGE = "ROracle")
if (eof_res)
TRUE
else
.Call("rociResFetch", hdl, -1L, PACKAGE = "ROracle")
}, silent = TRUE)
.Call("rociResTerm", hdl, PACKAGE = "ROracle")
if (inherits(res, "try-error"))
stop(res)
res
}
.oci.GetException <- function(con)
{
.Call("rociConError", con@handle, PACKAGE = "ROracle")
}
.oci.ConnectionInfo <- function(con, what)
{
info <- .Call("rociConInfo", con@handle, PACKAGE = "ROracle")
info$results <- lapply(info$results,
function(hdl) new("OraResult", handle = hdl))
if (!missing(what))
info <- info[what]
info
}
.oci.ConnectionSummary <- function(con)
{
info <- .oci.ConnectionInfo(con)
cat("User name: ", info$username, "\n")
cat("Connect string: ", info$dbname, "\n")
cat("Server version: ", info$serverVersion, "\n")
cat("Server type: ", info$serverType, "\n")
cat("Results processed: ", info$resTotal, "\n")
cat("OCI prefetch: ", info$prefetch, "\n")
cat("Bulk read: ", info$bulk_read, "\n")
cat("Bulk write: ", info$bulk_write, "\n")
cat("Statement cache size: ", info$stmt_cache, "\n")
cat("Open results: ", info$resOpen, "\n")
invisible(info)
}
###############################################################################
## (*) OraConnection: Convenience methods ##
###############################################################################
.oci.ListTables <- function(con, schema = NULL, all = FALSE, full = FALSE)
{
if (all)
{
# validate schema
if (!is.null(schema))
stop("cannot specify 'schema' when 'all' is TRUE")
#Bug 13843807 : Modify query to list views also
qry <- "select owner, object_name \
from all_objects where object_type = 'TABLE' \
or object_type = 'VIEW'"
res <- .oci.GetQuery(con, qry)
}
else if (!is.null(schema))
{
# validate schema
schema <- as.character(schema)
.oci.ValidateString("schema", schema, TRUE)
bnd <- paste(':', seq_along(schema), sep = '', collapse = ',')
#Bug 13843807 : Modify query to list views also
qry <- paste("select owner, object_name",
"from all_objects",
"where owner in (", bnd, ")",
" and (object_type = 'TABLE'",
" or object_type = 'VIEW')")
res <- .oci.GetQuery(con, qry,
data = data.frame(matrix(schema, nrow = 1L)))
}
else
{
#Bug 13843807 : Modify query to list views also
qry <- "select user, object_name from \
user_objects where (object_type = 'TABLE' \
or object_type = 'VIEW')"
res <- .oci.GetQuery(con, qry)
}
if (full)
c(res[, 1L], res[, 2L])
else
res[, 2L]
}
.oci.ReadTable <- function(con, name, schema = NULL, row.names = NULL)
{
# validate name
name <- as.character(name)
.oci.ValidateString("name", name)
# validate schema
if (!is.null(schema))
{
schema <- as.character(schema)
.oci.ValidateString("schema", schema)
}
# form name
if (is.null(schema))
tab <- sprintf('"%s"', name)
else
tab <- sprintf('"%s"."%s"', schema, name)
# read table
qry <- paste('select *',
'from', tab)
res <- .oci.GetQuery(con, qry)
# add row.names
if (!is.null(row.names))
{
cols <- names(res)
if (is(row.names, "logical") || is(row.names, "numeric"))
row.names <- cols[row.names]
else
row.names <- as.character(row.names)
row.names <- match(row.names, cols, nomatch = 0)
if (length(row.names) != 1L)
stop("'row.names' must be a single column")
if (row.names < 1L || row.names > length(cols))
stop("'row.names' not found")
names.col <- as.character(res[, row.names])
res <- res[, -row.names, drop = FALSE]
row.names(res) <- names.col
}
res
}
.oci.WriteTable <- function(con, name, value, row.names = FALSE,
overwrite = FALSE, append = FALSE,
ora.number = TRUE, schema = NULL, date = FALSE)
{
# commit
.oci.Commit(con)
# validate overwite and append
if (overwrite && append)
stop("'overwrite' and 'append' cannot both be TRUE")
# validate name
name <- as.character(name)
.oci.ValidateString("name", name)
# validate schema
if (!is.null(schema))
{
schema <- as.character(schema)
.oci.ValidateString("schema", schema)
}
# add row.names column
if (row.names && !is.null(row.names(value)))
{
value <- cbind(row.names(value), value)
names(value)[1L] <- "row.names"
}
# coerce data
value <- .oci.data.frame(value)
# get column names and types
if (con@timesten)
ctypes <- sapply(head(value,0), .oci.dbType, ora.number = ora.number, TRUE, date)
else
ctypes <- sapply(value, .oci.dbType, ora.number = ora.number, FALSE, date)
cnames <- sprintf('"%s"', names(value))
# create table
drop <- TRUE
if (.oci.ExistsTable(con, name, schema))
{
if (overwrite)
{
.oci.RemoveTable(con, name, FALSE, schema)
.oci.CreateTable(con, name, cnames, ctypes, schema)
}
else if (append)
drop <- FALSE
else
stop("table or view already exists")
}
else
.oci.CreateTable(con, name, cnames, ctypes, schema)
# insert data
res <- try(
{
# [17383542] create query to insert data in table of global space also
if (is.null(schema))
{
stmt <- sprintf('insert into "%s" values (%s)', name,
paste(":", seq_along(cnames), sep = "",
collapse = ","))
}
else
{
stmt <- sprintf('insert into "%s"."%s" values (%s)', schema, name,
paste(":", seq_along(cnames), sep = "",
collapse = ","))
}
.oci.GetQuery(con, stmt, data = value)
}, silent = TRUE)
if (inherits(res, "try-error"))
{
if (drop)
.oci.RemoveTable(con, name, FALSE, schema)
stop(res)
}
else
.oci.Commit(con)
TRUE
}
.oci.ExistsTable <- function(con, name, schema = NULL)
{
# validate name
name <- as.character(name)
.oci.ValidateString("name", name)
# validate schema
if (!is.null(schema))
{
schema <- as.character(schema)
.oci.ValidateString("schema", schema)
}
# check for existence
if (!is.null(schema))
{
# Bug 13843805 : Changed table name from all_tables to all_objects
qry <- "select 1 from all_objects \
where (object_name = :1 and owner = :2) \
and (object_type = 'TABLE' or object_type = 'VIEW')"
res <- .oci.GetQuery(con, qry,
data = data.frame(name = name, schema = schema))
}
else
{
# Bug 13843805 : Changed table name from user_tables to user_objects
qry <- "select 1 from user_objects where object_name = :1 \
and (object_type = 'TABLE' or object_type = 'VIEW')"
res <- .oci.GetQuery(con, qry,
data = data.frame(name = name))
}
nrow(res) == 1L
}
.oci.RemoveTable <- function(con, name, purge = FALSE, schema = NULL)
{
# validate name
name <- as.character(name)
.oci.ValidateString("name", name)
# validate schema
if (!is.null(schema))
{
schema <- as.character(schema)
.oci.ValidateString("schema", schema)
}
# remove
parm <- if (purge) "purge" else ""
#Bug 13843809 : Modify query to find out that given
# name is table or view
qry <- "select object_type from all_objects \
where object_name = :1 and object_type = 'VIEW'"
res <- .oci.GetQuery(con, qry, data = data.frame(name = name))
if (nrow(res) == 1L)
{
if (is.null(schema))
stmt <- sprintf('drop view "%s"', name)
else
stmt <- sprintf('drop view "%s"."%s"', schema, name)
}
else
{
if (is.null(schema))
stmt <- sprintf('drop table "%s" %s', name, parm)
else
stmt <- sprintf('drop table "%s"."%s" %s', schema, name, parm)
}
.oci.GetQuery(con, stmt)
TRUE
}
.oci.ListFields <- function(con, name, schema = NULL)
{
name <- as.character(name)
if (!is.null(schema))
schema <- as.character(schema)
#Bug 13843805 : Check table exist or not.
# If table does not exist then throw error
validTab = .oci.ExistsTable(con,name, schema)
if (!validTab)
stop(gettextf('table "%s" does not exist', name))
# get column names
if (!is.null(schema))
{
if (con@timesten)
{
qry <- paste('select rtrim (columns.colname) as column_name ',
'from sys.tables, sys.columns ',
'where tables.tblid = columns.id ',
'and tables.tblname = :1 ',
'and tables.owner = :2 ',
'order by columns.colnum')
}
else
{
qry <- "select column_name from all_tab_columns \
where table_name = :1 and owner = :2 \
order by column_id"
}
res <- .oci.GetQuery(con, qry,
data = data.frame(name = name, schema = schema))
}
else
{
if (con@timesten)
{
qry <- paste('select rtrim (columns.colname) as column_name ',
'from sys.tables, sys.columns ',
'where tables.tblid = columns.id ',
'and tables.tblname = :1 ',
'order by columns.colnum')
}
else
{
qry <- "select column_name from user_tab_columns \
where table_name = :1 order by column_id"
}
res <- .oci.GetQuery(con, qry,
data = data.frame(name = name))
}
res[, 1L]
}
###############################################################################
## (*) OraConnection: Transaction management ##
###############################################################################
.oci.Commit <- function(con)
{
info <- .oci.ConnectionInfo(con)
if (info$serverType == "Oracle Extproc")
.oci.GetQuery(con, "commit")
else
.Call("rociConCommit", con@handle, PACKAGE = "ROracle")
TRUE
}
.oci.Rollback <- function(con)
{
info <- .oci.ConnectionInfo(con)
if (info$serverType == "Oracle Extproc")
.oci.GetQuery(con, "rollback")
else
.Call("rociConRollback", con@handle, PACKAGE = "ROracle")
TRUE
}
###############################################################################
## (*) OraResult ##
###############################################################################
.oci.fetch <- function(res, n = -1L)
{
eof_res <- .Call("rociEOFRes", res@handle, PACKAGE = "ROracle")
if (eof_res)
stop("no more data to fetch")
df <- try(
{
.Call("rociResFetch", res@handle, n, PACKAGE = "ROracle")
}, silent = TRUE)
if (inherits(res, "try-error"))
stop(res)
df
}
.oci.ClearResult <- function(res)
{
.Call("rociResTerm", res@handle, PACKAGE = "ROracle")
TRUE
}
.oci.ResultInfo <- function(res, what)
{
info <- .Call("rociResInfo", res@handle, PACKAGE = "ROracle")
if (!missing(what))
info <- info[what]
info
}
.oci.EOFResult <- function(res)
{
eof_res <- .Call("rociEOFRes", res@handle, PACKAGE = "ROracle")
eof_res
}
.oci.ResultSummary <- function(res)
{
info <- .oci.ResultInfo(res)
cat("Statement: ", info$statement, "\n")
cat("Rows affected: ", info$rowsAffected, "\n")
cat("Row count: ", info$rowCount, "\n")
cat("Select statement: ", info$isSelect, "\n")
cat("Statement completed: ", info$completed, "\n")
cat("OCI prefetch: ", info$prefetch, "\n")
cat("Bulk read: ", info$bulk_read, "\n")
cat("Bulk write: ", info$bulk_write, "\n")
invisible(info)
}
###############################################################################
## (*) OraResult: DBI extensions ##
###############################################################################
.oci.execute <- function(res, data = NULL)
{
if (!is.null(data))
data <- .oci.data.frame(data, TRUE)
.Call("rociResExec", res@handle, data, PACKAGE = "ROracle")
}
## ------------------------------------------------------------------------- ##
## INTERNAL FUNCTIONS ##
## ------------------------------------------------------------------------- ##
.oci.drv <- function() get("ora.driver", envir = .oci.GlobalEnv)
.ext.drv <- function() get("ext.driver", envir = .oci.GlobalEnv)
.oci.dbTypeCheck <- function(obj)
{
(inherits(obj, c("logical", "integer", "numeric", "character",
"difftime")) ||
(inherits(obj, "POSIXct") && typeof(obj) == "double") ||
(is.list(obj) && all(unlist(lapply(obj, is.raw), use.names = FALSE))))
}
.oci.data.frame <- function(obj, datetime = FALSE)
{
tzone <- FALSE
if (!is.data.frame(obj))
{
if (!is.null(attr(obj, "ora.parameter_mode")))
stop(gettextf("argument '%s' must be NULL for SQL query",
"ora.parameter_mode"))
name <- attr(obj, "ora.parameter_name")
obj <- as.data.frame(obj)
attr(obj, "ora.parameter_name") <- name
}
for (i in seq_len(ncol(obj)))
{
col <- obj[[i]]
if (!is.null(attr(col, "ora.parameter_mode")))
stop(gettextf("argument '%s' must be NULL for SQL query",
"ora.parameter_mode"))
if (!.oci.dbTypeCheck(col))
{
if (inherits(col, "Date"))
{
if (!tzone)
{
.oci.ValidateZoneInEnv(FALSE)
tzone <- TRUE
}
obj[[i]] <- as.POSIXct(strptime(col, "%Y-%m-%d"))
}
else if (inherits(col, "POSIXct")) # integer storage mode
{
if (!tzone)
{
.oci.ValidateZoneInEnv(FALSE)
tzone <- TRUE
}
if (!datetime)
storage.mode(obj[[i]]) <- "double"
}
else
{
name <- attr(obj, "ora.parameter_name")
typ <- attr(col, "ora.type")
enc <- attr(col, "ora.encoding")
mxl <- attr(col, "ora.maxlength")
obj[[i]] <- as.character(col)
attr(obj, "ora.parameter_name") <- name
attr(obj[[i]], "ora.type") <- typ
attr(obj[[i]], "ora.encoding") <- enc
attr(obj[[i]], "ora.maxlength") <- mxl
}
}
else if (inherits(col, "POSIXct") && datetime)
{
if (!tzone)
{
.oci.ValidateZoneInEnv(FALSE)
tzone <- TRUE
}
}
else if (inherits(col, "difftime"))
obj[[i]] <- as.difftime(as.numeric(col, units = "secs"), units = "secs")
}
obj
}
.oci.pls.data.frame <- function(obj, datetime = FALSE)
{
tzone <- FALSE
# for PL/SQL queries
if (!is.data.frame(obj))
{
mode <- attr(obj, "ora.parameter_mode")
name <- attr(obj, "ora.parameter_name")
typ <- attr(obj, "ora.type")
enc <- attr(obj, "ora.encoding")
mxl <- attr(obj, "ora.maxlength")
obj <- as.data.frame(obj)
attr(obj, "ora.parameter_mode") <- mode
attr(obj, "ora.parameter_name") <- name
attr(obj, "ora.type") <- typ
attr(obj, "ora.encoding") <- enc
attr(obj, "ora.maxlength") <- mxl
}
for (i in seq_len(ncol(obj)))
{
col <- obj[[i]]
if (!.oci.dbTypeCheck(col))
{
if (inherits(col, "Date"))
{
if (!tzone)
{
.oci.ValidateZoneInEnv(FALSE)
tzone <- TRUE