func (c *Conn) newEmptyResultset(stmt *sqlparser.Select) *mysql.Resultset {
r := &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, c.alloc))
} else {
r.Fields[i].Name = hack.Slice(nstring(e.Expr, c.alloc))
}
default:
r.Fields[i].Name = hack.Slice(nstring(e, c.alloc))
}
}
r.Values = make([]mysql.RowValue, 0)
r.RowDatas = make([]mysql.RowData, 0)
return r
}
func (c *Conn) handleExec(stmt sqlparser.Statement, sql string, args []interface{}, skipCache bool) error {
if !skipCache {
// handle cache
plan, ti, err := c.getPlanAndTableInfo(stmt)
if err != nil {
return errors.Trace(err)
}
if ti == nil {
return errors.Errorf("sql: %s not support", sql)
}
c.server.IncCounter(plan.PlanId.String())
if ti.CacheType != schema.CACHE_NONE {
if len(ti.PKColumns) != len(plan.PKValues) {
return errors.Errorf("updated/delete/replace without primary key not allowed %+v", plan.PKValues)
}
if len(plan.PKValues) == 0 {
return errors.Errorf("pk not exist, sql: %s", sql)
}
log.Debugf("%s %+v, %+v", sql, plan, plan.PKValues)
pks := pkValuesToStrings(ti.PKColumns, plan.PKValues)
ti.Lock.Lock(hack.Slice(pks[0]))
defer ti.Lock.Unlock(hack.Slice(pks[0]))
invalidCache(ti, pks)
}
}
bindVars := makeBindVars(args)
conns, err := c.getShardConns(false, stmt, bindVars)
if err != nil {
return errors.Trace(err)
} else if len(conns) == 0 { //todo:handle error
return errors.Errorf("not server found %s", sql)
}
var rs []*mysql.Result
rs, err = c.executeInShard(conns, sql, args)
c.closeShardConns(conns)
if err == nil {
err = c.mergeExecResult(rs)
}
return errors.Trace(err)
}
func (c *Conn) fillCacheAndReturnResults(plan *planbuilder.ExecPlan, ti *tabletserver.TableInfo, keys []string) error {
rowsql, err := generateSelectSql(ti, plan)
log.Info(rowsql)
ti.Lock.Lock(hack.Slice(keys[0]))
defer ti.Lock.Unlock(hack.Slice(keys[0]))
conns, err := c.getShardConns(true, nil, nil)
if err != nil {
return errors.Trace(err)
} else if len(conns) == 0 {
return errors.Errorf("not enough connection for %s", rowsql)
}
rs, err := c.executeInShard(conns, rowsql, nil)
defer c.closeShardConns(conns)
if err != nil {
return errors.Trace(err)
}
//todo:fix hard code
result := rs[0]
if len(result.Values) == 0 {
log.Debug("empty set")
return c.writeResultset(result.Status, result.Resultset)
}
//log.Debugf("%+v", result.Values[0])
retValues := applyFilter(plan.ColumnNumbers, result.Values[0])
//log.Debug(len(retValues), len(keys))
r, err := c.buildResultset(getFieldNames(plan, ti), []mysql.RowValue{retValues})
if err != nil {
log.Error(err)
return errors.Trace(err)
}
//just do simple cache now
if len(result.Values) == 1 && len(keys) == 1 && ti.CacheType != schema.CACHE_NONE {
pks := pkValuesToStrings(ti.PKColumns, plan.PKValues)
log.Debug("fill cache", pks)
c.server.IncCounter("fill")
ti.Cache.Set(pks[0], result.RowDatas[0], 0)
}
return c.writeResultset(c.status, r)
}
//compare value using asc
func cmpValue(v1 interface{}, v2 interface{}) int {
if v1 == nil && v2 == nil {
return 0
} else if v1 == nil {
return -1
} else if v2 == nil {
return 1
}
switch v := v1.(type) {
case string:
s := v2.(string)
return bytes.Compare(hack.Slice(v), hack.Slice(s))
case []byte:
s := v2.([]byte)
return bytes.Compare(v, s)
case int64:
s := v2.(int64)
if v < s {
return -1
} else if v > s {
return 1
} else {
return 0
}
case uint64:
s := v2.(uint64)
if v < s {
return -1
} else if v > s {
return 1
} else {
return 0
}
case float64:
s := v2.(float64)
if v < s {
return -1
} else if v > s {
return 1
} else {
return 0
}
default:
//can not go here
panic(fmt.Sprintf("invalid type %T", v))
}
}
func Raw(t byte, val Value, isUnsigned bool) []byte {
if val == nil {
return nil
}
var ret []byte
switch t {
case MYSQL_TYPE_TINY, MYSQL_TYPE_SHORT, MYSQL_TYPE_INT24, MYSQL_TYPE_LONG,
MYSQL_TYPE_LONGLONG, MYSQL_TYPE_YEAR:
if isUnsigned {
ret = []byte(strconv.FormatUint(val.(uint64), 10))
} else {
ret = []byte(strconv.FormatInt(val.(int64), 10))
}
case MYSQL_TYPE_FLOAT, MYSQL_TYPE_DOUBLE:
ret = []byte(strconv.FormatFloat(val.(float64), 'f', 16, 64))
case MYSQL_TYPE_VARCHAR:
str, ok := val.(string)
if ok {
ret = hack.Slice(str)
break
}
fallthrough
default:
var ok bool
ret, ok = val.([]byte)
if !ok {
log.Errorf("%v, %+v, %T", t, val, val)
}
}
return ret
}
func HashValue(value interface{}) uint64 {
switch val := value.(type) {
case int:
return uint64(val)
case uint64:
return uint64(val)
case int64:
return uint64(val)
case string:
return uint64(crc32.ChecksumIEEE(hack.Slice(val)))
case []byte:
return uint64(crc32.ChecksumIEEE(val))
}
panic(NewKeyError("Unexpected key variable type %T", value))
}
func (c *Conn) buildResultset(nameTypes []schema.TableColumn, values []mysql.RowValue) (*mysql.Resultset, error) {
r := &mysql.Resultset{Fields: make([]*mysql.Field, len(nameTypes))}
var b []byte
var err error
for i, vs := range values {
if len(vs) != len(r.Fields) {
return nil, errors.Errorf("row %d has %d column not equal %d", i, len(vs), len(r.Fields))
}
var row []byte
for j, value := range vs {
field := &mysql.Field{}
if i == 0 {
r.Fields[j] = field
//log.Warningf("%+v", nameTypes[i])
field.Name = hack.Slice(nameTypes[j].Name)
if err = formatField(field, value); err != nil {
return nil, errors.Trace(err)
}
field.Type = nameTypes[j].SqlType
field.Charset = uint16(mysql.CollationNames[nameTypes[j].Collation])
field.IsUnsigned = nameTypes[j].IsUnsigned
}
if value == nil {
row = append(row, "\xfb"...)
} else {
b = mysql.Raw(byte(field.Type), value, field.IsUnsigned)
row = append(row, mysql.PutLengthEncodedString(b, c.alloc)...)
}
}
r.RowDatas = append(r.RowDatas, row)
}
return r, nil
}
