PL/SQL :: Delete Or Empty Single Field Containing BLOB In Oracle Table?
Jul 8, 2012
I have a table in schema with a BLOB field. I store employee's picture in this field. Fields in this table are emp_id (number) emp_name (varchar2) and emp_photo (BLOB). I want to ask if there is a way in pl / sql that i could empty this BLOB field to null or reset this field so that user can change the saved photo graph and save another one.
what i am looking for is something like
alter table employee set emp_photo = empty_blob() or alter table employee set emp_photo = null
I try to find out how export data from table to Excel file format and save the result to BLOB field in some other table.I know how to download report from Page by submit, but I need to process data and instead of returning result to user as Excel file - save it in BLOB.
Also I found implementation on JAVA for the issue but actually I wanna study out - Is it possible to resolve this issue by PL/SQL and APEX API methods?
I know how to select the last N sets of rows, using DENSE_RANK - where multiple rows have the same timestamp but I want to only select those rows which do NOT have the top 2 unique timestamps.
i.e.:
SELECT * FROM ( SELECT DENSE_RANK() OVER (ORDER BY myTimestamp DESC) DENSE_RANK, HISTORYID, USER_ID, myTimestamp, STATUS, FROM TXN_HIST) WHERE DENSE_RANK > 2 order by myTimestamp DESC, HISTORYID, USER_ID;
CREATE TABLE "COMPDB"."PRODUCTS" ( "PRO_ID" NUMBER NOT NULL ENABLE, "PRO_NAME" VARCHAR2(40 BYTE) NOT NULL ENABLE, "COMPETITOR" NUMBER NOT NULL ENABLE, "CATEGORY" NUMBER NOT NULL ENABLE,
[Code]..
Now my problem:
In want to delete the blob column(The Content) in Products and the columns, which belong to this column(Filename,Mimetype,Last_update_date). EMPTY_BLOB() doesn't work
Using Oracle 10g2 I'm trying to create a ctx index, using CTX_DLL atributtes.
begin CTX_DDL.CREATE_PREFERENCE ('LEXER_SINTILDES', 'BASIC_LEXER'); CTX_DDL.SET_ATTRIBUTE ('LEXER_SINTILDES', 'BASE_LETTER', 'YES'); end;
drop index se.INDEX_PRONUMJNE_CTX;
CREATE INDEX INDEX_PRONUMJNE_CTX on TBL_PRONUM (MyBlobColumn) INDEXTYPE IS CTXSYS.CONTEXT parameters('sync (on commit) LEXER LEXER_SINTILDES');However, I got errors: ORA-29855: error occurred in the execution of ODCIINDEXCREATE routine ORA-20000: Oracle Text error: DRG-10700: preference does not exist: LEXER_SINTILDES ORA-06512: at "CTXSYS.DRUE", line 160 ORA-06512: at "CTXSYS.TEXTINDEXMETHODS", line 364
Is it possible to create this kind of indexes for blob fields? Or just for varchar field
I have a db field "image" of type BLOB and I save the contents to a file on a local folder c: example.bmp.
I found numerous examples
BEGIN - Get LOB locator SELECT image INTO l_blob pc_immagini_blob FROM WHERE code = WCI; - Open the destination file. l_file: UTL_FILE.fopen = ('C: Temp', 'EXAMPLE.BMP', 'w', 32767); -----> error
The db is not local but on an application server, the image must be saved to c: the client.
The SQL below successfully inserts a row into my PDF_TEMPLT table and reads the referenced pdf file into the TEMPLT field. However, the pdf stored in the blob is incomplete or somehow corrupted. It's 438655 bytes long and causes the application that uses it from the database to crash. If I load the same file into the blob field using Quest Software's Toad GUI, it's 438667 bytes (12 bytes longer), and the consuming application works fine. I have the same problem with other pdfs, too, though the difference in length varies from 2 to 17 bytes, with the SQL-loaded blob always being shorter.
why a blob loaded by this SQL would differ from one loaded via Toad, and what changes I'd need to make to this SQL to get it work properly?
I needed to create a page on my existing APEX application that would allow the user to upload a file, I followed an online tutorial where the user had created a dummy table and inserted CSV File inserted through APEX into the table. Following that simple example I am able to load the simple CSV file (from tutorial) into a dummy table (from tutorial) but when I attempt to insert actual/dummy data into my actual database (which has a lot more fields of different types), using the exact same process, I am unable to do so.
Ironically, I am unable to insert even dummy values despite the fact that I have been able to insert the same dummy values using SQL Developer. Icing on the cake is that APEX does not produce any error, this lack of debugging feature (especially line by line debugging) is such a pain. Just to add, I can load the values into an Array and can successfully print the delimited values off the array but am still unable to insert the same values into my table. Here is the table that I am attempting to insert into (actual names replaced by Dummyxx):
Note that all the the CSV does not contain all the fields, the CSV files that are expected to be entered into the system contain 65 Fields whereas the Table has 73 Fields. Also note that the process runs fine through SQL loader that is invoked through a different server which I need to release and hence the attempt to load the table this way. Also, the procedure on the SQL Loader server is quite complex and involved JAVA+Unix Shell Scripts etc. which I would prefer to avoid.
Can I achieve the merge (update-only) and delete in a single SQL statement?
merge into table_4 using (select table_3.col1 col1,table_3.col2 col2, from table_1, table_2, table_3 where [code].....
delete from table_3 where <records identified in the 'using' clause of above merge>;
i.e.
delete from table_3 where (table_3.col1,table_3.col2) in ( select table_3.col1,table_3.col2, from table_1, table_2, table_3 where join conditions..... other conditions .... group by table_3.col1, col1,table_3.col2 having count(*) >1 );
What I want is roughly as following :
WITH mywith as ( select table_3.col1,table_3.col2, from table_1, table_2, table_3 where join conditions..... other conditions .... group by table_3.col1, col1,table_3.col2 having count(*) >1 ) update table_4 set col3='N' where table_4.col1=mywith.col1 and table_4.col2=mywith.col2 delete from table_3 where table_3.col1=mywith.col1 and table_3.col2=mywith.col2;
I need to create a stored procedure in Oracle 9i which will automatically delete data one by one from a particular table and then by means of same procedure insert record one by one in same table.
My form consist two datablock cust_mstr,cust_dtls, each customer code consists two or three contact details records, when i delete the single detail record instead of deleting single record it deletes all the details records from cust_detail table.
Here by i attaching my form for your reference pls find the code in delete button
CREATE TABLE prim_tbl (id NUMBER,--- id is not primary key here description VARCHAR2(30));
INSERT ALL INTO prim_tbl VALUES (1,'aad') INTO prim_tbl VALUES (1,'aads') INTO prim_tbl VALUES (2,'bb') INTO prim_tbl VALUES (2,'cc') INTO prim_tbl VALUES (2,'dd') SELECT * FROM dual;
I want to select the ids only one time, i.e my output will have only two rows: one row with id as 1 and other row with id 2 whatever be the description.
desired output sample:
Quote:1, aad 2, bb
I used: select distinct(id),description from prim_tbl;
but it did not give the required result.How can I get it??
I have to write a procedure that accepts schema name, table name and column value as parameters....I knew that i need to use metadata to do that deleting manually.
In literal terms, I'm interested in two fields, I'll call them Field A and Field B. I want to find all situations where a single unique value of Field A has both values Z AND X in Field B (not either or, but both together).
To go into some detail -
I need to make a query that finds ONLY occurrences where one employee id has a certain set of values together (without going into specifics, I'll say PermissionA, PermissionB, PermissionC). I can easily make a query that returns all user id's and all permissions belonging to them, and I can use criteria to filter the results to Permission A B and C only so as to exclude other permissions from getting returned (since there are hundreds),
however my objective is to get ONLY results where the same employee ID has all of those permissions (not just any one or two of the three). However, I don't want to have any criteria that limits the employee ID (I want to search all employee id's, and get a list of those with permissions a and b and c, not just any combination thereof, but all of them). I'm currently able to organize the output using a pivot table by employee id > role,
so that I can easily look at each employee and the roles they have, but I want to undertake a project that will involve searching a much larger number of employees (a # that makes it impractical for me to look through the list, I need to have a query that limits the results to the combinations that I'm looking for, as in this example - permission a b and c together).
There is one table with data in ORCL1 database.I have created the table using create table statement in ORCL2 database.Now i want to insert only the data into table.
I know one method ... drop the table i created using drop table statement and then create the table with data using export/import.
Is there any other way we can load data into empty table?
My db version: Oracle 11g I have an empty csv file.I created a external table for the empty csv file.When I run:select count(*) from externaltblname;It returns 1. It should return 0 right. In the definition, I specified "SKIP 1"But still it returns 1. When I use this external table to load into a target table. It loads a single row with null values.How to fix this.
I have uploaded some tables from MS Access to Oracle and in the process, some Number fields have been converted to Text. This means that any Queries where there are calculations with those fields (which have been converted to text) don't work properly anymore.
I would like to change the field type from text to number (with cmd and sqlplus) as that's the only way I can access the oracle backend.
I am not sure what commands to use to change this.
Also, if I change the data type from text to number, is it likely I will lose some data?
Consider below is a multi record block rows, i want to hide "23". Is it possible using Set_Item_Instance_Property or any other built-in is there in oracle forms to hide a single row field in a multi record block.
I have developed one report but need one formatting suggestion. There is one field called "DESCRIPTION", I want the value of this field to be displayed in a single line. Now the big values are wrapped into multiple line.
Now,
DISPLAY ---------------- This is a Oracle Report.
I want, DISPLAY ------------------------ This is a Oracle Report.
I know I can add a check constraint for m,t,w,r,f,s,u How can I add a constraint that will allow any combination of the above. For example it would allow m or mf, or mwf Someone said it could be done with trim but I can not figure it out.
what empty blocks are, and how to remove them.What I'd like to do is not have empty blocks in the first place on loading a table. I load a lot of "static" tables and would like to not have any wasted space at the end, with minimal shinanigans.
I've set pctfree 0 I"ve set initial to close to the end table size I've set next to 1M I've set pctincrease 0 blocksize is 8k
Yet I still need to at least do an alter table deallocate unused
