ISqlValidator class abstract

CHECK constraint validation check (SQL generation).

IMPORTANT for implementors: The sql property MUST be declared as a final String sql field (not a computed getter) so that the code generator can read it via Dart's constant evaluation at build time.

✅ Correct — final field, readable at generation time:

class MyValidator implements ISqlValidator {
  @override
  final String sql;
  const MyValidator() : sql = '{column} IS NOT NULL';
}

✅ Also correct for parameterized validators (ternary is a const expression):

class RangeValidator implements ISqlValidator {
  @override
  final String sql;
  const RangeValidator(int min, int max)
    : sql = '{column} BETWEEN $min AND $max';
}

❌ Wrong — computed getter cannot be read by the generator:

@override
String get sql { // will NOT generate a CHECK constraint
  if (someCondition) return '...';
  return '...';
}

For validators whose SQL depends on a list of values and cannot be expressed as a const expression (e.g., IN (...) clauses), the generator will automatically fall back to reading the values field and constructing the IN clause.

Implemented types

• IValidator

Constructors

ISqlValidator()

Const base constructor.

const

Properties

constraint → String?

Optional constraint name (CONSTRAINT name for CHECK constraint or error name for JSON validation).

no setter, inherited

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

sql → String

The SQL template expression. Can contain {column} as a placeholder.

no setter

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited