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Asked: 2026-05-23T02:24:42+00:00

I am fetching data from MySql Server into R using RODBC. So in one

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I am fetching data from MySql Server into R using RODBC.
So in one column of the database is a character vector 

SELECT MAX(CHAR_LENGTH(column)) FROM reqtable;

RETURNS 26566

Now I will show you an example how I am running into the problem 

`library(RODBC)
 con <- odbcConnect("mysqlcon")
 rslts <- as.numeric(sqlQuery(con,
                          "SELECT CHAR_LENGTH(column) FROM reqtable LIMIT 10",
                          as.is=TRUE)[,1])

`
returns 

> rslts
 [1]  62  31  17 103  30 741  28  73  25 357

where as
rslts <- nchar(as.character(sqlQuery(con,
"SELECT column FROM reqtable LIMIT 10",
as.is=TRUE)[,1]))

returns 

> rslts
 [1]  62  31  17 103  30 255  28  73  25 255

So strings with length > 255 is getting truncated at 255. Is there a way I can get the full string.

Thanks

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1 Answer

  1. Editorial Team

    The PostgreSQL ODBC driver has a variable called MaxLongVarcharSize that I have found set to 8190 by default (I’ve used it both on Windows and Ubuntu). It is possible that the MySQL ODBC driver has a similar variable set to 255.

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