Validations

[Jrgil20]

This pull request includes several changes to the commands.sql file, primarily focusing on adding new checks and constraints to ensure data integrity in the database. The most important changes include adding a new function and trigger for checking specific conditions related to tipoProductor, modifying existing data insertion statements to match new constraints, and adding a new constraint to the CANTIDAD_OFRECIDA table.

New Functions and Triggers:

• Added check_ProductorCg function to ensure no active contract exists with the same subastadora and productora when tipoProductor is 'Cg'.
• Created a trigger check_ProductorCg to execute the check_ProductorCg function before insert or update operations on the CONTRATO table.

Modifications to Existing Functions:

• Updated check_ContratoActivo function to include a condition that checks tipoProductor is not 'Cg' before raising an exception. [1] [2]

Constraints and Data Integrity:

• Added a new constraint chk_idCatalogoProductora_equals_idContratoProductora to the CANTIDAD_OFRECIDA table to ensure idCatalogoProductora matches idContratoProductora.

Data Modifications:

• Modified data insertion statements in CANTIDAD_OFRECIDA and LOTE tables to align with the new constraints and ensure data consistency. [1] [2]