property

sqlite.Statement.declaredTypes

readonly declaredTypes: null | string[]

The declared column types from the table schema, as reported by sqlite3_column_decltype().

Returns an array of:

  • The exact type string declared in the CREATE TABLE statement
  • null for columns without declared types, such as expressions and computed columns

Available for both read-only and read-write statements, before and after they run.

// For table columns:
const stmt = db.prepare("SELECT id, name, weight FROM products");
console.log(stmt.declaredTypes);
// => ["INTEGER", "TEXT", "REAL"]

// For expressions (no declared types):
const exprStmt = db.prepare("SELECT length('bun') AS str_length");
console.log(exprStmt.declaredTypes);
// => [null]