By using this site, you agree to our updated Privacy Policy and our Terms of Use. Manage your Cookies Settings.
437,903 Members | 1,067 Online
Bytes IT Community
+ Ask a Question
Need help? Post your question and get tips & solutions from a community of 437,903 IT Pros & Developers. It's quick & easy.

JDBC DatabaseMetaData problem

P: n/a
Hello,

I have the following problem working with DatabaseMetaData. There is a
database with table and attribute names in Russian. Database cluster was
initialized with appropriate ru_RU.KOI8-R locale. All the databases were
created with KOI8-R encoding. No problems were encountered in accessing
database table data with JDBC.

Database has foreign key constraints that I try to get with
DatabaseMetaData methods. Both getTables and getPrimaryKeys work fine,
all the results have correct encoding and values.

The following fragment of code causes exception:

rs = meta.getImportedKeys(null,null,tableName);
while(rs.next()) {

String pkTable = rs1.getString("PKTABLE_NAME");
String pkColumn = rs1.getString("PKCOLUMN_NAME"); /* here */

String fkTable = rs1.getString("FKTABLE_NAME");
String fkColumn = rs1.getString("FKCOLUMN_NAME"); /* and here */

}

PKTABLE_NAME and FKTABLE_NAME fields are fetched correctly. Both the
marked lines produce exception with this stack trace:

at org.postgresql.core.Encoding.decodeUTF8(Encoding.j ava:270)
at org.postgresql.core.Encoding.decode(Encoding.java: 165)
at org.postgresql.core.Encoding.decode(Encoding.java: 181)
at
org.postgresql.jdbc1.AbstractJdbc1ResultSet.getStr ing(AbstractJdbc1ResultSet.java:97)
at
org.postgresql.jdbc1.AbstractJdbc1ResultSet.getStr ing(AbstractJdbc1ResultSet.java:337)

Error message is: "Invalid character data was found. This is most
likely caused by stored data containing characters that are invalid for
the character set the database was created in. The most common example
of this is storing 8bit data in a SQL_ASCII database.",

but database is not SQL_ASCII (actually KOI8-R) and all the characters
in column names are taken from this codepage. Other DatabaseMetaData
methods work with these characters fine.

I tested the same methods with the same database but with tables with
latin names - everything worked fine, but renaming all the columns will
cause a huge amount of extra work with database and applications.
I use PostgreSQL-7.3.4 compiled from source, JDBC driver from
http://jdbc.postgresql.org/download/pg73jdbc3.jar on Linux, J2SDK 1.4.1_02.
I will appreciate any help with this.

Thank you.
Sincerely yours,
Aleksey.
---------------------------(end of broadcast)---------------------------
TIP 6: Have you searched our list archives?

http://archives.postgresql.org

Nov 12 '05 #1
Share this Question
Share on Google+
1 Reply


P: n/a
Wrong list. Please post this to the pg********@postgresql.org list.

I am sure there are people there that can help you with this.

Regards,
Fernando

Aleksey wrote:
Hello,

I have the following problem working with DatabaseMetaData. There is a
database with table and attribute names in Russian. Database cluster was
initialized with appropriate ru_RU.KOI8-R locale. All the databases were
created with KOI8-R encoding. No problems were encountered in accessing
database table data with JDBC.

Database has foreign key constraints that I try to get with
DatabaseMetaData methods. Both getTables and getPrimaryKeys work fine,
all the results have correct encoding and values.

The following fragment of code causes exception:

rs = meta.getImportedKeys(null,null,tableName);
while(rs.next()) {

String pkTable = rs1.getString("PKTABLE_NAME");
String pkColumn = rs1.getString("PKCOLUMN_NAME"); /* here */

String fkTable = rs1.getString("FKTABLE_NAME");
String fkColumn = rs1.getString("FKCOLUMN_NAME"); /* and here */

}

PKTABLE_NAME and FKTABLE_NAME fields are fetched correctly. Both the
marked lines produce exception with this stack trace:

at org.postgresql.core.Encoding.decodeUTF8(Encoding.j ava:270)
at org.postgresql.core.Encoding.decode(Encoding.java: 165)
at org.postgresql.core.Encoding.decode(Encoding.java: 181)
at
org.postgresql.jdbc1.AbstractJdbc1ResultSet.getStr ing(AbstractJdbc1ResultSet.java:97)

at
org.postgresql.jdbc1.AbstractJdbc1ResultSet.getStr ing(AbstractJdbc1ResultSet.java:337)
Error message is: "Invalid character data was found. This is most
likely caused by stored data containing characters that are invalid for
the character set the database was created in. The most common example
of this is storing 8bit data in a SQL_ASCII database.",

but database is not SQL_ASCII (actually KOI8-R) and all the characters
in column names are taken from this codepage. Other DatabaseMetaData
methods work with these characters fine.

I tested the same methods with the same database but with tables with
latin names - everything worked fine, but renaming all the columns will
cause a huge amount of extra work with database and applications.
I use PostgreSQL-7.3.4 compiled from source, JDBC driver from
http://jdbc.postgresql.org/download/pg73jdbc3.jar on Linux, J2SDK 1.4.1_02.
I will appreciate any help with this.

Thank you.
Sincerely yours,
Aleksey.
---------------------------(end of broadcast)---------------------------
TIP 6: Have you searched our list archives?

http://archives.postgresql.org

--
Fernando Nasser
Red Hat Canada Ltd. E-Mail: fn*****@redhat.com
2323 Yonge Street, Suite #300
Toronto, Ontario M4P 2C9
---------------------------(end of broadcast)---------------------------
TIP 3: if posting/reading through Usenet, please send an appropriate
subscribe-nomail command to ma*******@postgresql.org so that your
message can get through to the mailing list cleanly

Nov 12 '05 #2

This discussion thread is closed

Replies have been disabled for this discussion.