mysql

# MySQL (connected) The connection is in the env (`$MYSQL_HOST`, `$MYSQL_PORT`, `$MYSQL_USER`, `$MYSQL_PASSWORD`, `$MYSQL_DATABASE`). Pass the password via `MYSQL_PWD` and the rest as flags. The client is preinstalled once the sandbox has been rebuilt for this capability (Environment card). - List tables: `MYSQL_PWD="$MYSQL_PASSWORD" mysql -h"$MYSQL_HOST" -P"$MYSQL_PORT" -u"$MYSQL_USER" "$MYSQL_DATABASE" -e "SHOW TABLES;"` - Describe a table: `MYSQL_PWD="$MYSQL_PASSWORD" mysql -h"$MYSQL_HOST" -P"$MYSQL_PORT" -u"$MYSQL_USER" "$MYSQL_DATABASE" -e "DESCRIBE <table>;"` - Run a query: `MYSQL_PWD="$MYSQL_PASSWORD" mysql -h"$MYSQL_HOST" -P"$MYSQL_PORT" -u"$MYSQL_USER" "$MYSQL_DATABASE" -e "SELECT * FROM <table> LIMIT 20;"` - Scriptable output (tab-separated, no header): add `-N -B`, e.g. `MYSQL_PWD="$MYSQL_PASSWORD" mysql -N -B -h"$MYSQL_HOST" -P"$MYSQL_PORT" -u"$MYSQL_USER" "$MYSQL_DATABASE" -e "SELECT count(*) FROM <table>;"` - List databases: `MYSQL_PWD="$MYSQL_PASSWORD" mysql -h"$MYSQL_HOST" -P"$MYSQL_PORT" -u"$MYSQL_USER" -e "SHOW DATABASES;"` Notes: this is a read-write connection — the connected user's grants bound what you can do. Prefer a `WHERE` on every `UPDATE`/`DELETE`.