FkConstraintOfField constructs a foreign key constraint from a struct field.

FkConstraintOn constructs a foreign key constraint in a fluent style.

not MySQL.

unspecified option is available but its semantics vary by DB vendor, so it's not included here.

CheckConstraint holds an expression that refers to table columns and is applied as a precondition whenever a table insert, update or delete is attempted.

FkConstraint holds a pair of references and their update/delete consequences.

Reference holds a table + column reference used by constraints.

Relationship represents a parent-child relationship.

Constraint represents data that augments the data-definition SQL statements such as CREATE TABLE.

Consequence is the action to be performed after updating or deleting a record constrained by foreign key.

Constraints holds constraints.

FkConstraints holds foreign key constraints.