Struct GeneratedValueColumns 

pub struct GeneratedValueColumns { /* private fields */ }

The identity and generated columns of one table, in column order, read once for a statement that writes it. PostgreSQL applies these rules when it rewrites the statement, column by column in table order, before it reads or writes a row, so a statement whose source yields no row is rejected as well.

Implementations

impl GeneratedValueColumns

pub fn of( catalog: &dyn AssignmentColumnCatalog, table: &str, ) -> Result<Self, SQLError>

The identity and generated columns of table; none for a relation the catalog does not describe as a table.

pub fn contains(&self, column: &str) -> bool

Whether column is an identity column, whose value OVERRIDING USER VALUE leaves to its sequence.

pub fn validate_insert<'a>( &self, targets: impl IntoIterator<Item = (&'a str, bool)>, overriding: Option<OverridingKind>, ) -> Result<(), SQLError>

Reject a value an INSERT supplies for a generated column, and for a GENERATED ALWAYS identity column without an OVERRIDING clause, which a generated column ignores. targets names each target column with whether some row supplies a value other than DEFAULT for it.

pub fn validate_update<'a>( &self, assignments: impl IntoIterator<Item = (&'a str, bool)>, ) -> Result<(), SQLError>

Reject an assignment other than DEFAULT to a generated column or a GENERATED ALWAYS identity column by an UPDATE, an ON CONFLICT DO UPDATE or a MERGE update. assignments names each assigned column with whether its value is DEFAULT.