how to check clob empty in oracle

In Oracle, table columns are changed from VARCHAR2 to CLOB and varchar2clob.Scenario The columns in the original table are defined as the VARCHAR2 type. As we all know, the maximum length of the VARCHAR2 type is 4000. If you want to convert this

Clob is saved as a local xml file. After modification, it is uploaded. clobxml I wrote a small program with my friends over the past two days. The functions are as follows: First, save the database clob as a local xml file, modify the xml file, and

The Blob field in Oracle is special. It has much better performance than the long field and can be used to save binary data such as sample slices.Writing Blob fields is very different from writing other types of fields. Because Blob itself has a

I have used Oracle databases because of my working relationships. I found that there are not many users here, but I often find that some people have not answered questions about how to operate ORACLE databases using PHP. I have also asked a few

Oracle's BLOB field is special, and he performs much better than a long field, and can be used to save binary data such as a sample.Writing BLOB fields and writing to other types of fields is very different because the BLOB itself has a cursor, you

Oracle classic Q & A list [common] Oracle classic Q & A list [common] Directories01. What is the initial password after oracle is installed?02. What is the initial Default

I use the Oracle database because of the working relationship, I found that there are not many people here, but often found that some of the questions about PHP operations Oracle database is not answered, I have asked several, but also no response,

The difference between Oracle and MySQL 1. is a large database and MySQL is a small and medium-sized database, Oracle market share of 40%,mysql only about 20%, while MySQL is open source and Oracle price is very high Oracle. 2. Oracle supports large

oracle| Data | database | Original I use the Oracle database for working relationship, found that there are not many people here, but often found that someone mentioned in the PHP operation of the Oracle database problem is not answered, I have

1. Oracle startup and Shutdown1. In a single-host environmentTo start or shut down the Oracle system, you must first switch to the Oracle user, as shown below:Su-Oracle A. Start the Oracle SystemOracle> svrmgrlSvrmgr> connect internalSvrmgr>