I open the database
sqlite3 /nix/var/nix/db/db.sqlite
in the database, I try to list every table and then select the content of a table
.tables
Error: attempt to write a readonly database
select * from t_I_dont_know_if_this_table_exists;
Parse error: attempt to write a readonly database
This database is very very probably read only but these 2 operations shouldn't change the data. I don't understand why I get this message.
Sounds like the CLI does not have write permission to wherever it is trying to write command line history file .sqlite_history. Try setting the environment variable SQLITE_HISTORY (incuding file name) to a writeable location.
Related
The code in my project now:
local lsqlite3 = require "lsqlite3complete"
self.db_conn = lsqlite3.open("cost.db")
function showrow(udata,cols,values,names)
assert(udata=='test_udata')
for i=1,cols do
print('',names[i],values[i])
end
return 0
end
self.db_conn:exec('select * from cost',showrow,'test_udata')
It is no problem to select the cost records from the code above, but if I change like below and try to open it in memory:
self.db_conn = lsqlite3.open_memory("cost.db")
The code has no error but there is no records or tables inside when I do the query. How can I change my code so that I can open and put my database inside memory? Since I would like to access my data quickly in memory instead of keep connecting to a database.
A memory database is one that exists only in memory. That is, it doesn't get its data from a file. Because of that, open_memory doesn't take any parameters.
If you want to use a database that lives in a file, then that means accessing that file.
You should not need to "keep connecting to a database". You connect to it once at the beginning of the application and keep it open until your application terminates.
I need to do a mass insert into my database. I have French characters(e.g é) into my table
When i connect to SQLPlus and run the query manually
INSERT INTO TEST VALUES ('é');
Data is inserted properly.
When i save the same query in an Sql file and execute same through SQLplus
I get below error:
SQLPLUS>#test.sql;
ERROR:
ORA-01756: quoted string not properly terminated
Can anyone guide me.
thanks
I am trying to insert code of XML file into a column which is of XMLtype
I have below query which is working fine
select extract(xmlcol,'/*')
from (SELECT xmltype(BFILENAME('MEDIA_DIR', 'xmldata1.xml'),nls_charset_id('UTF-8')) xmlcol FROM dual)
On running this query I am getting the Xmlcode inside the xml file(xmldata1) in one row.
Now, As per my requirement I have created a type which reads data from the XMLfile.
Below is the code of member function of the type:
create or replace type body t_emp
as
member function get_xml return xmltype is
v_xml xmltype;
begin
select extract(xmlcol,'/*') into v_xml
from (SELECT xmltype(BFILENAME('MEDIA_DIR', 'xmldata1.xml'),nls_charset_id('UTF-8')) xmlcol FROM dual);
return v_xml;
end get_xml;
end;
I am calling this type member function in my code. Below is the code
declare
t_emp1 t_emp;
r1 xmltype;
begin
t_emp1 := t_emp(2);
r1 := t_emp1.get_xml;
insert into EMPLOYEE_XML values (t_emp1.id,r1);
end;
Here variable r1 is of importance as I am fetching XML data in this variable.
On running this code I am getting below error:
ORA-22285: non-existent directory or file for FILEOPEN operation
I am not able to understand why this error is coming as the directory exist. I am able to run previously mentioned SQL query.
Thanks!!
The user you are creating the type as only has permissions on the directory object granted through a role. Privileges from roles are not inherited by stored PL/SQL blocks by default. When you run the SQL directly the role is enabled; when you run in through the PL/SQL member function the role is disabled and the directory is not visible to your user. You need the directory privileges to be granted directly to your user.
In your case you are working in the SYSTEM schema (so the directory privilege is coming via the EXP_FULL_DATABASE role, which comes from DBA), which is a bad idea; it is not good practice to create objects in that schema (or any built-in schema), so granting privileges directly to `SYSTEM would also be a mistake here.
You should create a new user/schema, with the minimum privileges it needs. You've already created the directory object, so the new user set-up would include:
grant read,write on media_dir to your_new_user;
You can then create the type and its member function in that new schema, and you'll be able to execute it from your anonymous block.
If you can only have privileges granted through a role then you could instead change the type declaration to use invoker's rights
create or replace type t_emp authid current_user as object ...
That would even work in your current scenario, sticking with SYSTEM; but again you really shouldn't be working in that schema.
While importing an oracle schema from dump file, i am getting below error while creating tables.
ORA-14102: only one LOGGING or NOLOGGING clause may be specified.
I see the above error while creating tables from the dumpfile for several tables.
How to enable or disable LOGGING/NOLOGGING at schema level before i start import?
When performing an Oracle database export with the expdp of Oracle 11gR2 (11.2.0.1) and then importing it into the database with impdp, the following error messages appear in the import log file:
ORA-39083: Object type INDEX failed to create with error:
ORA-14102: only one LOGGING or NOLOGGING clause may be specified
This is a known Oracle 11gR2 issue. The problem is that the DBMS_METADATA.GET_DDL returns invalid syntax for an index created. So, during the index creation, both the NOLOGGING and LOGGING keywords are visible in the DDL. Download and apply Patch 8795792 from Oracle to resolve this issue.
I have a python script which creates a sqlite database out of some external data. This works fine. But everytime I execute a GROUP BY query on this database, I get an "Error: unable to open database file". Normal SELECT queries work.
This is an issue for both, the sqlite3 library of python and the sqlite3 cli binary:
sqlite> SELECT count(*) FROM REC;
count(*)
----------
528489
sqlite> SELECT count(*) FROM REC GROUP BY VERSION;
Error: unable to open database file
sqlite>
I know that these errors are typically permission errors (I have read all questions which I could find on this topic on StackOverflow), but I'm quite sure it is not in my case:
I'm talking about a readily created database and read requests
I checked the permissions: Both the file and its containing folders have write permissions set
I can even write to the database: Creating a new table is no problem.
The device is not full, it got plenty of space.
Ensure that your process has access to the TEMP directory.
From the SQLite's Use Of Temporary Disk Files documentation:
SQLite may make use of transient indices to implement SQL language
features such as:
An ORDER BY or GROUP BY clause
The DISTINCT keyword in an aggregate query
Compound SELECT statements joined by UNION, EXCEPT, or INTERSECT
Each transient index is stored in its own temporary file. The
temporary file for a transient index is automatically deleted at the
end of the statement that uses it.
You probably can verify if temporary storage is the problem by setting the temp_store pragma to MEMORY:
PRAGMA temp_store = MEMORY;
to tell SQLite to keep the transient index for the GROUP BY clause in memory.
Alternatively, create an explicit index on the column you are grouping by to prevent the transient index from being created.