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
}
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
}