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library("RSQLite")
DATA <- new.env(parent=emptyenv(), hash=TRUE)
.setUp <- function() {
DATA$dbfile <- tempfile()
DATA$db <- dbConnect(dbDriver("SQLite"), DATA$dbfile)
}
.tearDown <- function() {
lapply(dbListResults(DATA$db), dbClearResult)
dbDisconnect(DATA$db)
file.remove(DATA$dbfile)
}
basicDf <- data.frame(name=c("Alice", "Bob", "Carl", "NA", NA),
fldInt=as.integer(c(as.integer(1:4), NA)),
fldDbl=as.double(c(1.1, 2.2, 3.3, 4.4, NA)),
stringsAsFactors=FALSE)
testBasicTypeConversion <- function() {
db <- DATA$db
schema = "create table t1 (name text, fldInt integer, fldDbl float)"
dbGetQuery(db, schema)
dbBeginTransaction(db)
dbGetPreparedQuery(db, "insert into t1 values (?, ?, ?)", bind.data=basicDf)
dbCommit(db)
expected_types <- c(name="character", fldInt="integer", fldDbl="double")
gotdf <- dbGetQuery(db, "select * from t1")
checkEquals(dim(basicDf), dim(gotdf))
checkEquals(expected_types, sapply(gotdf, typeof))
expect_na <- c(rep(FALSE, 4), TRUE)
for (j in ncol(gotdf)) {
checkEquals(expect_na, is.na(gotdf[, j]))
}
}
testNAInFirstRow <- function() {
db <- DATA$db
basicDf <- data.frame(name=c(NA, "Alice", "Bob", "Cody", NA),
id=as.integer(c(NA, 10:12, NA)),
rate=c(NA, 1:3 * pi, NA), stringsAsFactors=FALSE)
basicTableSql <- ('create table t1 (name text, id integer, rate real)')
values <- c("(:name, :id, :rate)")
dbGetQuery(db, basicTableSql)
sql <- paste("insert into t1 values", values)
tryCatch({
dbBeginTransaction(db)
rs <- dbSendPreparedQuery(db, sql, bind.data=basicDf)
dbClearResult(rs)
}, error=function(e) {
dbRollBack(db)
signalCondition(e)
})
dbCommit(db)
got <- dbGetQuery(db, "select * from t1")
checkEquals(basicDf, got)
}
testUnitFetch <- function() {
db <- DATA$db
## Create table by hand
schema = "create table t1 (name text, fldInt integer, fldDbl float)"
dbGetQuery(db, schema)
dbBeginTransaction(db)
dbGetPreparedQuery(db, "insert into t1 values (?, ?, ?)", bind.data=basicDf)
dbCommit(db)
expected_types <- c(name="character", fldInt="integer", fldDbl="double")
rs <- dbSendQuery(db, "select * from t1")
on.exit(dbClearResult(rs))
for (i in seq_len(nrow(basicDf))) {
gotdf <- fetch(rs, n=1)
checkEquals(1:1, nrow(gotdf))
checkEquals(ncol(basicDf), ncol(gotdf))
checkEquals(expected_types, sapply(gotdf, typeof))
checkEquals(basicDf[i, ], gotdf)
}
## In this case, you can't know there are no more records:
checkTrue(!dbHasCompleted(rs))
checkEquals(0, nrow(fetch(rs, n=1)))
checkTrue(dbHasCompleted(rs))
}
testFetchByTwo <- function() {
db <- DATA$db
## Create table by hand
schema = "create table t1 (name text, fldInt integer, fldDbl float)"
dbGetQuery(db, schema)
dbBeginTransaction(db)
dbGetPreparedQuery(db, "insert into t1 values (?, ?, ?)", bind.data=basicDf)
dbCommit(db)
expected_types <- c(name="character", fldInt="integer", fldDbl="double")
rs <- dbSendQuery(db, "select * from t1")
on.exit(dbClearResult(rs))
N <- nrow(basicDf)
if (N %% 2 != 0)
N <- N + 1
N <- N / 2
for (i in seq(1, N)) {
gotdf <- fetch(rs, n=2)
checkEquals(ncol(basicDf), ncol(gotdf))
checkEquals(expected_types, sapply(gotdf, typeof))
if (i < 3) {
checkEquals(2, nrow(gotdf))
}
}
checkTrue(dbHasCompleted(rs))
}
testWriteTableBasicTypeConversion <- function() {
db <- DATA$db
dbWriteTable(db, "t1", basicDf, row.names=FALSE)
expected_types <- c(name="character", fldInt="integer", fldDbl="double")
gotdf <- dbGetQuery(db, "select * from t1")
checkEquals(dim(basicDf), dim(gotdf))
checkEquals(expected_types, sapply(gotdf, typeof))
checkTrue(all(is.na(gotdf[5, ])))
}
testFirstResultRowIsNull <- function() {
db <- DATA$db
data(USArrests)
dbWriteTable(db, "t1", USArrests)
a1 <- dbGetQuery(db, "select Murder/(Murder - 8.1) from t1 limit 10")
checkEquals("double", typeof(a1[[1]]))
## This isn't ideal, but for now, if the first row of a result set
## contains a NULL, then that column is forced to be character.
a2 <- dbGetQuery(db,
"select Murder/(Murder - 8.1) from t1 limit 10 offset 2")
checkEquals("character", typeof(a2[[1]]))
}
test_no_rows_preserves_column_count <- function()
{
db <- DATA$db
want_dim <- c(1L, 2L)
ans <- dbGetQuery(db, "select 1 as a, 2 as b where 1")
checkEquals(want_dim, dim(ans))
want_dim <- c(0L, 2L)
ans <- dbGetQuery(db, "select 1 as a, 2 as b where 0")
checkEquals(want_dim, dim(ans))
}
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