lob

Can you state any difference between the CLOB and NCLOB? A CLOB stores character data encoded in the database character set. A NCLOB stores character data encoded in the national character set SELECT parameter, value FROM v$nls_parameters WHERE parameter LIKE '%CHARACTERSET' will show you the database and national character sets of your database. 来源： https://stackoverflow.com/questions/6854609/what-is-the-difference-between-clob-and-nclob

I am running queries against an Oracle 10g with JDBC (using the latest drivers and UCP as DataSource) in order to retrieve CLOBs (avg. 20k characters). However the performance seems to be pretty bad: the batch retrieval of 100 LOBs takes 4s in average. The operation is also neither I/O nor CPU nor network bound judging from my observations. My test setup looks like this: PoolDataSource dataSource = PoolDataSourceFactory.getPoolDataSource(); dataSource.setConnectionFactoryClassName("..."); dataSource.setConnectionPoolName("..."); dataSource.setURL("..."); dataSource.setUser("..."); dataSource

When I try to display the contents of a LOB (large object) column in SQL*Plus, it is truncated. How do I display the whole thing? SQL> set long 30000 SQL> show long long 30000 You may also need: SQL> set longchunksize 30000 Otherwise the LOB/CLOB will wrap. 来源： https://stackoverflow.com/questions/122772/how-do-i-display-the-full-content-of-lob-column-in-oracle-sqlplus

I would like to hear your opinion about the two control providers. To put it in a nutshell: I am building a classic LOB desktop application. The app will be created entirely in WPF. PRISM 4.0 will be used heavily. Whenever possible, I will try to follow MVVM pattern(it would be nice if the selected controls were designed to adopt it easily). Mainly I am interested in: Good data grid, which supports sorting, filtering, grouping, exporting, printing and works fine with a big amount of bound records(10k+) Combobox that supports filtering and auto-complete. Navigation bar Layout manager that is

I am having trouble writing and reading back special characters like the Euro-sign (€) into LOB String properties in PostgreSQL 8.4 with Hibernate 3.6.10. What I know is that PostgreSQL provides two distinct ways to store large character objects in a column of a table. They can be stored either directly into that table column or indirectly in a separate table (it's actually called pg_largeobject). In the latter case, the column holds a reference (OID) to the row in pg_largeobject. The default behaviour in Hibernate 3.6.10 is the indirect OID approach. However, it is possible to add an extra

I am using Spring , JPA, Hibernate, Postgresql. I can upload/insert a file to the database. But I got the error when tried to access the file. EVERE: Servlet.service() for servlet default threw exception org.postgresql.util.PSQLException: Large Objects may not be used in auto-commit mode. at org.postgresql.largeobject.LargeObjectManager.open(LargeObjectManager.java:200) at org.postgresql.largeobject.LargeObjectManager.open(LargeObjectManager.java:172) at org.postgresql.jdbc2.AbstractJdbc2BlobClob.<init>(AbstractJdbc2BlobClob.java:47) at org.postgresql.jdbc2.AbstractJdbc2Blob.<init>

The following query can be used to list the database objects of the user: select object_name, object_type from user_objects; There are couple of entries where the object_type is LOB. How can these LOB objects be dropped in Oracle? One scenario where you can see a LOB in user_objects but the join to user_lobs doesn't find anything is if the table has already been dropped, but is in the recycle bin . create table t42 (my_clob clob); table T42 created. As expected, Justin's query shows you the column: select l.table_name, l.column_name, l.segment_name lob_name from user_lobs l join user_objects o