Documentation
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Overview ¶
Package sqlintro holds SQLite schema introspection shared by packages that cannot depend on each other.
It exists because the generated-column probe is needed in three places — graph (readers), cmd (the virtual-node writer) and internal/fixturedb (test fixtures) — and no two of them can host it for all three. graph's own tests import fixturedb, so fixturedb importing graph is a cycle; cmd is a leaf nobody imports. Three copies is what the duplicate_code gate objected to, and it was right: three implementations of "is this column writable" is three chances to answer differently.
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func ColumnIsGenerated ¶
func ColumnIsGenerated(q RowQuerier, table, col string) bool
ColumnIsGenerated reports whether table.col is a GENERATED column, which is readable but rejected at PREPARE time by any INSERT or UPDATE that names it. Writers targeting a table they did not create must ask before building a column list.
pragma_table_xinfo.hidden encodes the kind: 0 ordinary, 1 hidden (virtual-table), 2 GENERATED ... VIRTUAL, 3 GENERATED ... STORED. Only 2 and 3 are unwritable — a virtual table's hidden column still accepts writes. pragma_table_info cannot be substituted: it omits generated columns entirely, so it cannot distinguish "derived" from "absent".
A missing table or column reads as not-generated, matching the convention of collapsing absence into the negative answer.
Source Files