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# Working with Virtuoso for Local Development
* author: bonfacem
* reviewed-by: jnduli
Using guix, install the Virtuoso server:
```
guix install virtuoso-ose # or any other means to install virtuoso
cd /path/to/virtuoso/database/folder
cp $HOME/.guix-profile/var/lib/virtuoso/db/virtuoso.ini ./virtuoso.ini
# modify the virtuoso.ini file to save files to the folder you'd prefer
virtuoso-t +foreground +wait +debug
```
## Common Virtuoso Operations
Use isql to load up data:
```
isql
# subsquent commands run in isql prompt
# this folder is relative to the folder virtuoso was started from
ld_dir ('path/to/folder/with/ttls', '*.ttl', 'http://genenetwork.org');
rdf_loader_run();
checkpoint;
```
Add data using HTTP:
```
# Replace dba:dba with <user>:<password>
curl --digest --user 'dba:dba' --verbose --url\
"http://localhost:8890/sparql-graph-crud-auth?graph=http://genenetwork.org"\
-T test-data.ttl
```
Delete data using HTTP:
```
# Replace dba:dba with <user>:<password>
curl --digest --user 'dba:dba' --verbose --url\
"http://localhost:8890/sparql-graph-crud-auth?graph=http://genenetwork.org" -X DELETE
```
Query the graph data:
```
curl --verbose --url\
"http://localhost:8890/sparql-graph-crud?graph=http://genenetwork.org"
```
Check out more cURL examples here:
=> https://vos.openlinksw.com/owiki/wiki/VOS/VirtGraphProtocolCURLExamples SPARQL 1.1 Graph Store HTTP Protocol cURL Exampple Collection
## Setting Passwords
Virtuoso's default user is "dba" and its default password is "dba". To change a password, use isql to run:
```
set password "dba" "dba";
CHECKPOINT;
```
## More
Read a fuller more complete tutorial on Virtuoso here:
=> https://issues.genenetwork.org/topics/systems/virtuoso Virtuoso
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