write-to-database

write-to-database

Sequence writes data to MySQL database.

Preparations

Before proceeding setup MySQL database. The database can be setup locally when using the local version of transform-hub. Free MySQL hostings are good too e.g. freemysqlhosting.net.

Remember to setup transform-hub locally or use the platform's environment for sequence deployment.

Running

Create config.json using example.config.json as an example. Put valid mysql config in the config.json and save it.

To start the sequence run commands below:

# go to sample directory
cd samples/write-to-database

# install dependencies
yarn

# transpile TS->JS and copy node_modules and package.json to dist/
npm run build

# deploy the Sequence from the dist/ directory, which contains transpiled code, package.json and node_modules
si sequence deploy ./dist -f config.json

# see the Instance log
si inst log -

Check for database connection and table creation. It should be present in the logs if everything is all right.

{"level":"DEBUG","msg":"Connecting to database","ts":1658405585664,"from":"Sequence","Runner":{"id":"91c3ccb1-3a9d-46b7-bde2-7bfd693620f8"}}
{"level":"DEBUG","msg":"Connecting to database","ts":1658405585664,"from":"Sequence","CSIController":{"id":"91c3ccb1-3a9d-46b7-bde2-7bfd693620f8"}}
{"level":"DEBUG","msg":"Checking for todos table","ts":1658405585746,"from":"Sequence","Runner":{"id":"91c3ccb1-3a9d-46b7-bde2-7bfd693620f8"}}
{"level":"DEBUG","msg":"Checking for todos table","ts":1658405585746,"from":"Sequence","CSIController":{"id":"91c3ccb1-3a9d-46b7-bde2-7bfd693620f8"}}
{"level":"DEBUG","msg":"Awaiting inserts","ts":1658405585751,"from":"Sequence","Runner":{"id":"91c3ccb1-3a9d-46b7-bde2-7bfd693620f8"}}
{"level":"DEBUG","msg":"Awaiting inserts","ts":1658405585751,"from":"Sequence","CSIController":{"id":"91c3ccb1-3a9d-46b7-bde2-7bfd693620f8"}}

At this point there should be new table in the database. To add a new record to the table send some string to the input

# connect to the input stream of the instance
si inst input <id>
# provide title for the todo element
asdf

After that the logs should show that new element should be added to the table.

{"level":"DEBUG","msg":"Insering asdf\n","ts":1658405665408,"from":"Sequence","Runner":{"id":"91c3ccb1-3a9d-46b7-bde2-7bfd693620f8"}}
{"level":"DEBUG","msg":"Insering asdf\n","ts":1658405665408,"from":"Sequence","CSIController":{"id":"91c3ccb1-3a9d-46b7-bde2-7bfd693620f8"}}

Check the contents of the table to see if everything is in place.