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Refactor textRows.readRow to improve readability #1123

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Refactor textRows.readRow to improve readability #1123

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d4d83cc
Simplify textRows.readRow
dolmen Jun 2, 2020
317d804
textRows.readRow: refactor for more early return style
dolmen Jun 2, 2020
a4c7847
textRows.readRow: simplify switch block
dolmen Jun 2, 2020
5ea471c
packets.go: add empty line for readability
dolmen Jun 8, 2020
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49 changes: 23 additions & 26 deletions packets.go
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Original file line number Diff line number Diff line change
Expand Up @@ -761,40 +761,37 @@ func (rows *textRows) readRow(dest []driver.Value) error {
}

// RowSet Packet
var n int
var isNull bool
pos := 0

for i := range dest {
// Read bytes and convert to string
dest[i], isNull, n, err = readLengthEncodedString(data[pos:])
b, isNull, n, err := readLengthEncodedString(data[pos:])
if err != nil {
return err
}
pos += n
if err == nil {
if !isNull {
if !mc.parseTime {
continue
} else {
switch rows.rs.columns[i].fieldType {
case fieldTypeTimestamp, fieldTypeDateTime,
fieldTypeDate, fieldTypeNewDate:
dest[i], err = parseDateTime(
dest[i].([]byte),
mc.cfg.Loc,
)
if err == nil {
continue
}
default:
continue
}
}

} else {
dest[i] = nil
if isNull {
dest[i] = nil
continue
}
if !mc.parseTime {
dest[i] = b // type: []byte
continue
}

switch rows.rs.columns[i].fieldType {
case fieldTypeTimestamp, fieldTypeDateTime,
fieldTypeDate, fieldTypeNewDate:

t, err := parseDateTime(b, mc.cfg.Loc)
if err == nil {
dest[i] = t // type: time.Time
continue
}
// If parseDateTime failed, leave as []byte
}
return err // err != nil
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isn't err ignored now?
Seems like this should also have a test case.

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Okay, I just saw the comment above.
This is a semantic change, which I disagree with. We should not introduce any silent fallback behavior. The user requested a parsed time and should receive an error, not something unexpected.

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Well, it looks like I misunderstood the original code. And this shows that it must be refactored to make it easier to follow 😉 .

I will fix my code once the test suite is extended to cover that case.

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This still must be changed before I can approve this change.


dest[i] = b // type: []byte
}

return nil
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