Download Example Driver Shell Script

Example Driver Shell Script
This page shows the interaction with a driver.sh that invokes commands for MyDBQL (my database query
language).
% driver.sh
welcome to MyDBQL
Commands are:
1. new schema - creates a new schema
usage: ns <schema_name> <field1_name> ... <fieldm_name>
2. new database - creates a new database
usage: nd <schema_name> <database_name>
3. insert record - appends a record to a database file
usage: ir <database_name>
4. delete record - removes records from a database where <field_name>
has <field_value>
usage: dr <database_name> <field_name> <field_value>
5. print database - prints a database file as a table sorted by the
specified <field_name>
usage: pd <database_name> [[-n] <field_name>]
6. plot field - plots the values of a field in the specified database
usage: pf <database_name> <field_name>
7. help - prints out this summary of commands
usage: h
8. exit - exits MyDBQL
usage: ex
Please enter command:
ns person name age weight
Creating schema "person" with fields "name age weight".
Schema "person" has been created.
Please enter command:
nd medical
usage: nd <schema_name> <database_name>
Please enter command:
nd person medical
Creating "medical" database using schema "person".
Database "medical" using schema "person" has been created.
Please enter command:
ir medical
Inserting record into "medical" database.
Enter values for name age weight:
Johnson 42 220
Record added to "medical" database.
Please enter command:
e
invalid command: e
Please enter command:
h
Commands are:
1. new schema - creates a new schema
usage: ns <schema_name> <field1_name> ... <fieldm_name>
2. new database - creates a new database
usage: nd <schema_name> <database_name>
3. insert record - appends a record to a database file
usage: ir <database_name>
4. delete record - removes records from a database where <field_name>
has <field_value>
usage: dr <database_name> <field_name> <field_value>
5. print database - prints a database file as a table sorted by the
specified <field_name>
usage: pd <database_name> [[-n] <field_name>]
6. plot field - plots the values of a field in the specified database
usage: pf <database_name> <field_name>
7. help - prints out this summary of commands
usage: h
8. exit - exits MyDBQL
usage: ex
Please enter command:
ex
exiting MyDBQL
%