Beispiel #1
0
func (ti *TableInfo) fetchIndexes(conn dbconnpool.PoolConnection) error {
	indexes, err := conn.ExecuteFetch(fmt.Sprintf("show index from `%s`", ti.Name), 10000, false)
	if err != nil {
		return err
	}
	var currentIndex *schema.Index
	currentName := ""
	for _, row := range indexes.Rows {
		indexName := row[2].String()
		if currentName != indexName {
			currentIndex = ti.AddIndex(indexName)
			currentName = indexName
		}
		var cardinality uint64
		if !row[6].IsNull() {
			cardinality, err = strconv.ParseUint(row[6].String(), 0, 64)
			if err != nil {
				log.Warningf("%s", err)
			}
		}
		currentIndex.AddColumn(row[4].String(), cardinality)
	}
	if len(ti.Indexes) == 0 {
		return nil
	}
	pkIndex := ti.Indexes[0]
	if pkIndex.Name != "PRIMARY" {
		return nil
	}
	ti.PKColumns = make([]int, len(pkIndex.Columns))
	for i, pkCol := range pkIndex.Columns {
		ti.PKColumns[i] = ti.FindColumn(pkCol)
	}
	// Primary key contains all table columns
	for _, col := range ti.Columns {
		pkIndex.DataColumns = append(pkIndex.DataColumns, col.Name)
	}
	// Secondary indices contain all primary key columns
	for i := 1; i < len(ti.Indexes); i++ {
		for _, c := range ti.Indexes[i].Columns {
			ti.Indexes[i].DataColumns = append(ti.Indexes[i].DataColumns, c)
		}
		for _, c := range pkIndex.Columns {
			// pk columns may already be part of the index. So,
			// check before adding.
			if ti.Indexes[i].FindDataColumn(c) != -1 {
				continue
			}
			ti.Indexes[i].DataColumns = append(ti.Indexes[i].DataColumns, c)
		}
	}
	return nil
}
Beispiel #2
0
func analyzeUpdateExpressions(exprs sqlparser.UpdateExprs, pkIndex *schema.Index) (pkValues []interface{}, err error) {
	for _, expr := range exprs {
		index := pkIndex.FindColumn(sqlparser.GetColName(expr.Name))
		if index == -1 {
			continue
		}
		if !sqlparser.IsValue(expr.Expr) {
			log.Warningf("expression is too complex %v", expr)
			return nil, TooComplex
		}
		if pkValues == nil {
			pkValues = make([]interface{}, len(pkIndex.Columns))
		}
		var err error
		pkValues[index], err = sqlparser.AsInterface(expr.Expr)
		if err != nil {
			return nil, err
		}
	}
	return pkValues, nil
}