I’m trying to run a query that has a few columns that are a CLOB datatype. If i run the query like normal, all of those fields just have (CLOB) as the value.
I tried using DBMS_LOB.substr(column) and i get the error
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
How can i query the CLOB column?
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If you are using SQL*Plus try the following…
set long 8000 select ...
When getting the substring of a CLOB column and using a query tool that has size/buffer restrictions sometimes you would need to set the BUFFER to a larger size. For example while using SQL Plus use the SET BUFFER 10000 to set it to 10000 as the default is 4000.
Running the DMBS_LOB.substr command you can also specify the amount of characters you want to return and the offset from which. So using DMBS_LOB.substr(column, 3000) might restrict it to a small enough amount for the buffer.
See oracle documentation for more info on the substr command
DBMS_LOB.SUBSTR ( lob_loc IN CLOB CHARACTER SET ANY_CS, amount IN INTEGER := 32767, offset IN INTEGER := 1) RETURN VARCHAR2 CHARACTER SET lob_loc%CHARSET;
select DBMS_LOB.substr(myColumn, 3000) from myTable
Another option is to create a function and call that function everytime you need to select clob column.
create or replace function clob_to_char_func (clob_column in CLOB, for_how_many_bytes in NUMBER, from_which_byte in NUMBER) return VARCHAR2 is begin Return substrb(dbms_lob.substr(clob_column ,for_how_many_bytes ,from_which_byte) ,1 ,for_how_many_bytes); end;
and call that function as;
SELECT tocharvalue, clob_to_char_func(tocharvalue, 1, 9999) FROM (SELECT clob_column AS tocharvalue FROM table_name);
For big CLOB selects also can be used:
SELECT dbms_lob.substr( column_name, dbms_lob.getlength(column_name), 1) FROM foo