Here is a line of code that used to work:
res <- DBI::dbSendQuery(con, "SELECT 1")
Now it says:
Error in .verify.JDBC.result(r, "Unable to retrieve JDBC result set for ", :
Unable to retrieve JDBC result set for SELECT 1 (Error executing query)
I'm connecting to a Presto instance. Likely there's a connection problem or some other non-SQL problem.
How do I get more logging or debug information from this interface? I'm using DBI 0.7, R 3.4.3 on OS X (darwin15.6.0).
I read some of the docs, and I don't see an interface to turn on logging, or debug info. Maybe a connection parameter?
Related
I'm trying to automate data download from db using RJDBC using a for loop. The database im using automatically closes the connection after every 10mins, so what i want to do is somehow catch the error, remake the connection, and continue the loop. In order to do this i need to capture the error somehow, the problem is, it is not an r error so none of the commands trycatch and similar works. I just get a text on the console telling me:
Error in .jcheck() : No running JVM detected. Maybe .jinit() would help.
How do i handle this in terms of:
if (output == ERROR) {remake connection and run dbQuery} else {run dbQuery}
thanks for any help
You could use the pool package to abstract away the logic of connection management.
This does exactly what you expect regarding connection management with DBI.
It should work with RJDBC which is an implentation of DBI, but I didn't test it with this driver.
libray(pool)
library(RJDBC)
conn <- dbPool(
drv = RJDBC::JDBC(...),
dbname = "mydb",
host = "hostadress",
username = "test",
password = "test"
)
on.exit(poolClose(conn))
dbGetQuery(conn, "select... ")
I'm having a constant error whenever I try to execute my data function forcing it to run on Spotfire Server.
The script works fine on R Studio and also on Spotfire if the Run Location configuration is set to "Force Local" or "Default".
When I use the Force Server, I get the following error message when executing a query:
Could not execute function call. TIBCO Spotfire Statistics Services returned an error:
'Error in sqlQuery(myconn, mappingQuery, errors = TRUE, rows_at_time = : first argument is not an open RODBC channel'.
at Spotfire.Dxp.Data.DataFunctions.Executors.RemoteFunctionClient.OnExecuting(FunctionClient funcClient)
at Spotfire.Dxp.Data.DataFunctions.Executors.AbstractFunctionClient.<RunFunction>d__0.MoveNext()
at Spotfire.Dxp.Data.DataFunctions.Executors.SPlusFunctionExecutor.<ExecuteFunction>d__0.MoveNext()
at Spotfire.Dxp.Data.DataFunctions.DataFunctionExecutorService.<ExecuteFunction>d__6.MoveNext()
Even if I have a straightforward script and query like the one below, the results are the same:
require(RODBC)
myconn <- odbcDriverConnect("Driver={SQL Server};Server=MY_SERVER;Database=MY_DATABASE;Trusted_Connection=True")
# myconn <- odbcDriverConnect("Driver={SQL Server};Server=MY_SERVER;Database=MY_DATABASE;UID=MY_USER;Pwd=MY_PASSWORD") ## Same result with trusted connection or user/password
query <- "SELECT * FROM MY_TABLE"
df <- sqlQuery(myconn, query)
print(df)
Have anyone ever seen this?
Thanks!
The error seems to suggest that the "RODBC" package's 'odbcDriverConnect()' function might not be finding the ODBC drivers it needs on the server that TIBCO Spotfire Statistics Services (TSSS) is installed on.
Try installing the required odbc drivers on the machine where the TIBCO Spotfire Statistics Services is installed.
I'm having trouble connecting to a DB2 database via ODBC. I'm on a Windows system, and have configured a Data Source Name within the ODBC Administrator. When I test the connection there I get Connection tested successfully.. I can also successfully test the connection within IBM's DB2 Configuration Assistant, using both CLI and ODBC.
I'm not able to connect within R. I've tried both the RODBC & odbc packages, the result is the same. My intent is to execute a simple query to verify the connection. When I run the following R script I get an error. Here's my pseudocode.
library('RODBC')
myQuery <- 'SELECT COLUMN1, COLUMN2 FROM DATABASE.TABLE FETCH FIRST 10 ROWS ONLY;'
cnxn <- odbcConnect('myDSN')
data <- sqlQuery(channel=cnxn, query=myQuery)
odbcCloseAll()
Here's the error that I get.
Error in sqlQuery(channel = cnxn, query = myQuery) :
first argument is not an open RODBC channel
In addition: Warning messages:
1: In RODBC::odbcDriverConnect("DSN=myDSN") :
[RODBC] ERROR: state 58031, code -1031, message [IBM][CLI Driver] SQL1031N The database directory cannot be found on the indicated file system. SQLSTATE=58031
2: In RODBC::odbcDriverConnect("DSN=myDSN") : ODBC connection failed
I've learned through experimentation that my script never gets to the point of sending the query. This error is generated at the odbcConnect command.
I don't have access to the server itself, only the database. Is there anything that I can do or try to resolve this on my own, without having to go through support?
EDIT:
I've now cataloged my database, and test connection is successful in 3 places, ODBC Data Source Administrator, Db2 Command Line & Db2 Configuration Assistant. I know that there's no issue with permissions, as I can execute queries via IBM Query Management Facility. I believe this is an issue with either my driver or my system's PATH statements, but I'm not sure how to trace that down.
Taking a non-RODBC approach, the below method works for connecting R and DB2. Assuming you know all the information below, you'll need to download an IBM DB2 jar file and locate it, in this case, in a folder on my machine called "IBM".
Note: there are two types of available jar files, db2jcc.jar and db2jcc4.jar. The below example is using db2jcc.jar.
library(rJava)
library(RJDBC)
library(DBI)
#Enter the values for you database connection
dsn_driver = "com.ibm.db2.jcc.DB2Driver"
dsn_database = "" # e.g. "BLUDB"
dsn_hostname = "" # e.g.: "awh-yp-small03.services.dal.bluemix.net"
dsn_port = "" # e.g. "50000"
dsn_protocol = "TCPIP" # i.e. "TCPIP"
dsn_uid = "" # e.g. "dash104434"
dsn_pwd = "" # e.g. "7dBZ39xN6$o0JiX!m"
jcc = JDBC("com.ibm.db2.jcc.DB2Driver", "C:/Program Files/IBM/SQLLIB/java/db2jcc.jar");
jdbc_path = paste("jdbc:db2://", dsn_hostname, ":", dsn_port, "/", dsn_database, sep="");
conn = dbConnect(jcc, jdbc_path, user=dsn_uid, password=dsn_pwd)
query = "SELECT *
FROM Table
FETCH FIRST 10 ROWS ONLY";
rs = dbSendQuery(conn, query);
df = fetch(rs, -1);
df
According to the DB2 Manual here
SQL1031N The database directory cannot be found on the indicated file system.
Explanation
The system database directory or local database directory could not be found. A database has not been created or it was not cataloged correctly.
The command cannot be processed.
User response
Verify that the database is created with the correct path specification. The Catalog Database command has a path parameter which specifies the directory where the database resides.
sqlcode: -1031
sqlstate: 58031
I am trying to execute a SQL Query through R to get the data from Access DB
Normal SQL statement works fine, but when it comes to like statement its throwing error
Below is code :
library(RODBC);
channel = odbcDriverConnect("Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=C:/Users/ADMIN/Documents/R.accdb")
test = sqlQuery(channel ,paste('SELECT R.ID, R.Template, R.WEDate FROM R WHERE R.Template Like "*slow*"'))
Error:
[1] "07002 -3010 [Microsoft][ODBC Microsoft Access Driver] Too few parameters. Expected 2."
[2] "[RODBC] ERROR: Could not SQLExecDirect 'SELECT R.ID, R.Template, R.WEDate FROM R WHERE (R.Template Like \"slow\")'
Is there a way to fix this.
Consider both of #joran's suggestions with single quote enclosing string literals AND using the ANSI-92 wildcard operator %. You would use asterisk, * (ANSI-89 mode) when running an internal query, namely inside the MSAccess.exe GUI program (which defaults to DAO) or if you connect externally to Access with DAO. Meanwhile, ADO connections uses the percent symbol which most external interfaces uses including RODBC.
I was able to reproduce your issue and both these remedies worked. Also, no need to use paste() as you are not concatenating any other object to query statement.
library(RODBC);
channel = odbcDriverConnect("Driver={Microsoft Access Driver (*.mdb, *.accdb)};
DBQ=C:/Users/ADMIN/Documents/R.accdb")
test = sqlQuery(channel,
"SELECT R.ID, R.Template, R.WEDate FROM R WHERE R.Template Like '%slow%'")
I'm able to successfully connect and run queries in R from Hive using library(DBI) and library(RJDBC)
However, I'm trying to set the following config
Set hive.execution.engine=mr;
When I try to use the following command (which is how I would query), I get an error:
dbGetQuery(conn_expp_team, "Set hive.execution.engine=mr")
Here is the error:
Error in .verify.JDBC.result(r, "Unable to retrieve JDBC result set for ", :
Unable to retrieve JDBC result set for Set hive.execution.engine=mr (The query did not generate a result set!)
Use RJDBC::dbSendUpdate(conn, statement). Source: https://github.com/s-u/RJDBC/issues/25