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Oracle JDBC driver getDatabaseMetadata()["COLUMN_SIZE"] returns size in bytes (not in characters) for "BYTE" length semantics

smeshJun 14 2024

Description of getDatabaseMetadata()["COLUMN_SIZE"] in Javadoc:
"The COLUMN_SIZE column specifies the column size for the given column.
For character data, this is the ***length in characters***."

Scenario:
- Check that database encoding is multiple bytes per character.
- Create column with the definition VARCHAR2(4 BYTE).
- Try to insert 4 characters each of which is encoded as multiple bytes.
- DBMS correctly generates ORA-12899: value too large for column (actual: 8, maximum: 4)
- Issue: Oracle JDBC driver getDatabaseMetadata()["COLUMN_SIZE"] returns 4, should return 1.

Steps to reproduce:

select * from NLS_DATABASE_PARAMETERS where PARAMETER = 'NLS_CHARACTERSET'; 
-- NLS_LENGTH_SEMANTICS = BYTE 
-- NLS_CHARACTERSET = AL32UTF8 

create table T { 
C VARCHAR2(4 BYTE) 
); 

insert into T(C) values ('1234'); 
-- OK 

insert into T(C) values ('яяяя'); 
-- SQL Error: ORA-12899: value too large for column "T"."C" (actual: 8, maximum: 4) 

Write Java program where you get getDatabaseMetadata()["COLUMN_SIZE"]. 
-- It returns 4, should return 1.

Comments

Add EVENT_10842=15

You can also set this as an environment variable with the same name & value.

Sheeraz Majeed May 10 2024 — edited on May 10 2024

Hi, Thanks for reply.

But still no trace or log files to check used oci functions

Works for me.

cjones@cjones-mac:~$ rm -rf $HOME/instantclient/log/diag/clients && mkdir -p $HOME/instantclient/log/diag/clients
cjones@cjones-mac:~$ export EVENT_10842=15
cjones@cjones-mac:~$ sqlplus cj/cj@localhost/orclpdb1

...

SQL> select * from dual;

D
-
X

SQL> exit

And then a file like /Users/cjones/instantclient/log/diag/clients/user_cjones/host_nnnnnn_nn/trace/ora_nnn_nnnnn.trc will contain lines like:

# 2024-06-06 07:26:54.520 # Thread ID 8547126272 # Entry - OCIServerAttach(srvhp = 0x128030068, errhp = 0x13580a410, dblink_hash = H:0x9bf0f8e9ee161fdf, mode = OCI_DEFAULT(000000000), dblink = localhost/orclpdb1, dblink_len = 18 );
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Added on Jun 14 2024
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