Пример #1
0
// getDMLRouting updates the route with the necessary routing
// info. If it cannot find a unique route, then it returns an error.
func getDMLRouting(where *sqlparser.Where, route *engine.Route) error {
	if where == nil {
		return errors.New("unsupported: multi-shard where clause in DML")
	}
	for _, index := range route.Table.Ordered {
		if !vindexes.IsUnique(index.Vindex) {
			continue
		}
		if values := getMatch(where.Expr, index.Column); values != nil {
			route.Vindex = index.Vindex
			route.Values = values
			return nil
		}
	}
	return errors.New("unsupported: multi-shard where clause in DML")
}
Пример #2
0
// buildIndexPlan adds the insert value to the Values field for the specified ColVindex.
// This value will be used at the time of insert to validate the vindex value.
func buildIndexPlan(ins *sqlparser.Insert, colVindex *vindexes.ColVindex, route *engine.Route) error {
	row, pos := findOrInsertPos(ins, colVindex.Col)
	val, err := valConvert(row[pos])
	if err != nil {
		return fmt.Errorf("could not convert val: %s, pos: %d: %v", sqlparser.String(row[pos]), pos, err)
	}
	route.Values = append(route.Values.([]interface{}), val)
	row[pos] = sqlparser.ValArg([]byte(":_" + colVindex.Col))
	return nil
}
Пример #3
0
func buildAutoincPlan(ins *sqlparser.Insert, autoinc *vindexes.Autoinc, route *engine.Route) error {
	route.Generate = &engine.Generate{
		Opcode:   engine.SelectUnsharded,
		Keyspace: autoinc.Sequence.Keyspace,
		Query:    fmt.Sprintf("select next value from `%s`", autoinc.Sequence.Name),
	}
	// If it's also a colvindex, we have to add a redirect from route.Values.
	// Otherwise, we have to redirect from row[pos].
	if autoinc.ColVindexNum >= 0 {
		route.Generate.Value = route.Values.([]interface{})[autoinc.ColVindexNum]
		route.Values.([]interface{})[autoinc.ColVindexNum] = ":" + engine.SeqVarName
		return nil
	}
	row, pos := findOrInsertPos(ins, autoinc.Col)
	val, err := valConvert(row[pos])
	if err != nil {
		return fmt.Errorf("could not convert val: %s, pos: %d: %v", sqlparser.String(row[pos]), pos, err)
	}
	route.Generate.Value = val
	row[pos] = sqlparser.ValArg([]byte(":" + engine.SeqVarName))
	return nil
}