Method planScan

pgtype/pgtype.go:1069–1156

(oid uint32, formatCode int16, target any, depth int)

}

func (m *Map) planScan(oid uint32, formatCode int16, target any, depth int) ScanPlan {
	if depth > 8 {
		return &scanPlanFail{m: m, oid: oid, formatCode: formatCode}
	}

	if target == nil {
		return &scanPlanFail{m: m, oid: oid, formatCode: formatCode}
	}

	if _, ok := target.(*UndecodedBytes); ok {
		return scanPlanAnyToUndecodedBytes{}
	}

	switch formatCode {
	case BinaryFormatCode:
		if _, ok := target.(*string); ok {
			switch oid {
			case TextOID, VarcharOID:
				return scanPlanString{}
			}
		}
	case TextFormatCode:
		switch target.(type) {
		case *string:
			return scanPlanString{}
		case *[]byte:
			if oid != ByteaOID {
				return scanPlanAnyTextToBytes{}
			}
		case TextScanner:
			return scanPlanTextAnyToTextScanner{}
		}
	}

	var dt *Type

	if dataType, ok := m.TypeForOID(oid); ok {
		dt = dataType
	} else if dataType, ok := m.TypeForValue(target); ok {
		dt = dataType
		oid = dt.OID // Preserve assumed OID in case we are recursively called below.
	}

	if dt != nil {
		if plan := dt.Codec.PlanScan(m, oid, formatCode, target); plan != nil {
			return plan
		}
	}

	// This needs to happen before trying m.TryWrapScanPlanFuncs. Otherwise, a sql.Scanner would not get called if it was
	// defined on a type that could be unwrapped such as `type myString string`.
	//
	//  https://github.com/jackc/pgtype/issues/197
	if _, ok := target.(sql.Scanner); ok {
		if dt == nil {
			return &scanPlanSQLScanner{formatCode: formatCode}
		} else {
			return &scanPlanCodecSQLScanner{c: dt.Codec, m: m, oid: oid, formatCode: formatCode}