javaq092999
asked on
CLOB size, Trigger, <PRE>
Q1. CLOB allows 4GB of char data. I created a table like "CREATE TABLE aclob (id number, text clob)". When I do the "desc" on this table it shows me text as CLOB(4000). I tried to enter the data more than 4000 chars and the Oracle gives me the error "ORA-01704: string literal too long". Does that means by default the CLOB allows 4000 max chars. Do I need to create the table something like "CREATE table aclob (id number, text clob(20000)" so that it accept 20000 max chars. I am using Oracle 8.1.5 (with JDBC2.0 API) and Java/JDBC.
Q2. When I do not have any text to enter in my CLOB field I am entering NULL in it. It works fine. But then I came across this method named "empty_clob()". One can use this to insert instead of null. What this method is for. Do we need to use this method *preferably* instead of null in case there are no chars to be inserted in the CLOB field. Any advantages!
Q3. What is the basic difference between Before and After trigger. I think the difference lies only in that in after trigger you cannot set the values of the fields going in the table on which this trigger is fired!
Q4. <PRE>...</PRE> causes a new empty line to be added at its end. How to stop this new emty line to be added.
Regards
Q2. When I do not have any text to enter in my CLOB field I am entering NULL in it. It works fine. But then I came across this method named "empty_clob()". One can use this to insert instead of null. What this method is for. Do we need to use this method *preferably* instead of null in case there are no chars to be inserted in the CLOB field. Any advantages!
Q3. What is the basic difference between Before and After trigger. I think the difference lies only in that in after trigger you cannot set the values of the fields going in the table on which this trigger is fired!
Q4. <PRE>...</PRE> causes a new empty line to be added at its end. How to stop this new emty line to be added.
Regards
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Guy Hengel [angelIII / a3]
just a friendly reminder...
ASKER
I am using CLOB successfully but with an Upgrade issue with my old database. Initially I used VARCHAR2(2000) to store string data. Later I moved to CLOB instead of VARCHAR2. I moved all the old data into new tables (with CLOB columns) using "INSERT INTO NEW_TABLE AS (SELECT * FROM OLD_TABLE);" All the data comes fine and the data from VARCHAR2 also comes fine into CLOB but on comparision it gives that both are different. Is the above INSERT statement is OK to use for such conversion...
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