Пример #1
0
func (c *ClientConn) newEmptyResultset(stmt *sqlparser.Select) *mysql.Resultset {
	r := new(mysql.Resultset)
	r.Fields = make([]*mysql.Field, len(stmt.SelectExprs))

	for i, expr := range stmt.SelectExprs {
		r.Fields[i] = &mysql.Field{}
		switch e := expr.(type) {
		case *sqlparser.StarExpr:
			r.Fields[i].Name = []byte("*")
		case *sqlparser.NonStarExpr:
			if e.As != nil {
				r.Fields[i].Name = e.As
				r.Fields[i].OrgName = hack.Slice(nstring(e.Expr))
			} else {
				r.Fields[i].Name = hack.Slice(nstring(e.Expr))
			}
		default:
			r.Fields[i].Name = hack.Slice(nstring(e))
		}
	}

	r.Values = make([][]interface{}, 0)
	r.RowDatas = make([]mysql.RowData, 0)

	return r
}
Пример #2
0
func (c *ClientConn) buildResultset(fields []*mysql.Field, names []string, values [][]interface{}) (*mysql.Resultset, error) {
	var ExistFields bool
	r := new(mysql.Resultset)

	r.Fields = make([]*mysql.Field, len(names))
	//use the field def that get from true database
	if len(fields) != 0 {
		if len(r.Fields) == len(fields) {
			ExistFields = true
		} else {
			return nil, errors.ErrInvalidArgument
		}
	}

	var b []byte
	var err error

	for i, vs := range values {
		if len(vs) != len(r.Fields) {
			return nil, fmt.Errorf("row %d has %d column not equal %d", i, len(vs), len(r.Fields))
		}

		var row []byte
		for j, value := range vs {
			//列的定义
			if i == 0 {
				if ExistFields {
					r.Fields[j] = fields[j]
				} else {
					field := &mysql.Field{}
					r.Fields[j] = field
					field.Name = hack.Slice(names[j])
					if err = formatField(field, value); err != nil {
						return nil, err
					}
				}

			}
			b, err = formatValue(value)
			if err != nil {
				return nil, err
			}

			row = append(row, mysql.PutLengthEncodedString(b)...)
		}

		r.RowDatas = append(r.RowDatas, row)
	}

	return r, nil
}