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reader.go
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reader.go
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package database
import (
"database/sql"
"encoding/json"
"io"
"reflect"
"strings"
"time"
"github.com/evocert/kwe/iorw"
"github.com/evocert/kwe/iorw/active"
)
type ReaderHandle interface {
ColumnTypes() []ColumnTypeHandle
Columns() []string
Field(string) interface{}
Data(...string) []interface{}
Next() (bool, error)
ToJSON(w io.Writer) error
ToJSONData(w io.Writer) error
JSON() (string, error)
JSONData(...string) (string, error)
Close() error
}
type JSONEntry interface {
JSON() string
}
type JSONDataEntry interface {
JSON() string
}
//RWSAPI - interface
type RWSAPI interface {
Err() error
Close() error
Next() bool
Scan(dest ...interface{}) error
ColumnTypes() ([]*ColumnType, error)
Columns() ([]string, error)
}
//Reader - struct
type Reader struct {
*Executor
rws RWSAPI //*sql.Rows
rownr int64
strtrdng bool
isfocused bool
islast bool
isfirst bool
cls []string
cltpes []*ColumnType
data []interface{}
datamap map[string]interface{}
dispdata []interface{}
dataref []interface{}
OnColumns interface{}
OnRow interface{}
OnValidData interface{}
OnClose func(*Reader)
}
//ColumnTypes return Column types in form of a slice, 'array', of []*ColumnType values
func (rdr *Reader) ColumnTypes() []*ColumnType {
return rdr.cltpes
}
//Columns return Column names in form of a slice, 'array', of string values
func (rdr *Reader) Columns() []string {
return rdr.cls
}
//Data return Displayable data in the form of a slice, 'array', of interface{} values
func (rdr *Reader) Data(cols ...string) (dspdata []interface{}) {
var colsl = len(cols)
for n := range rdr.data {
rdr.dispdata[n] = castSQLTypeValue(rdr.data[n], rdr.cltpes[n])
if colsl == 0 {
dspdata = append(dspdata, rdr.dispdata[n])
}
}
if clnsl := len(rdr.cls); colsl > 0 && clnsl > 0 {
var dtaidx []int = []int{}
var cn = 0
var lstn = 0
var cni = 0
for cn < colsl {
if cni == clnsl {
cni = 0
}
for cni < clnsl {
if strings.EqualFold(cols[cn], rdr.cls[cni]) {
if lstn <= cn {
dspdata = append(dspdata, rdr.dispdata[cni])
} else {
dtaidx = append(dtaidx, cni)
}
lstn = cn
}
cni++
}
cn++
}
for _, cni := range dtaidx {
dspdata = append(dspdata, rdr.dispdata[cni])
}
}
return dspdata[:]
}
func (rdr *Reader) Field(name string) (val interface{}) {
if rdr != nil && rdr.rws != nil && name != "" {
if clsl := len(rdr.cls); clsl > 0 && len(rdr.data) == clsl {
for coln, col := range rdr.cls {
if strings.EqualFold(name, col) {
val = castSQLTypeValue(rdr.data[coln], rdr.cltpes[coln])
break
}
}
}
}
return
}
var emptymap = map[string]interface{}{}
//DataMap return Displayable data in the form of a map[string]interface{} column and values
func (rdr *Reader) DataMap() (datamap map[string]interface{}) {
if rdr != nil && len(rdr.data) > 0 && len(rdr.cls) == len(rdr.data) {
if rdr.datamap == nil {
rdr.datamap = map[string]interface{}{}
}
if displdata := rdr.Data(); len(displdata) > 0 && len(rdr.cls) == len(displdata) {
for cn := range rdr.cls {
rdr.datamap[rdr.cls[cn]] = displdata[cn]
}
}
return rdr.datamap
}
return emptymap
}
func (rdr *Reader) DATAJSONFPrintln(w io.Writer) (err error) {
if w != nil {
if err = rdr.DATAJSONFPrint(w); err == nil {
iorw.Fprintln(w)
}
}
return
}
func (rdr *Reader) DATAJSONFPrint(w io.Writer) (err error) {
if w != nil {
jsnenc := json.NewEncoder(w)
if rdr != nil && len(rdr.data) > 0 && len(rdr.cls) == len(rdr.data) {
displdata := rdr.Data()
if rdr.datamap == nil {
rdr.datamap = map[string]interface{}{}
}
for cn := range rdr.cls {
rdr.datamap[rdr.cls[cn]] = displdata[cn]
}
err = jsnenc.Encode(rdr.datamap)
} else {
err = jsnenc.Encode(emptymap)
}
}
return
}
//IsFocused - indicate if Reader focus is on a record
func (rdr *Reader) IsFocused() bool {
if rdr != nil {
return rdr.isfocused
}
return false
}
//IsMore - indicate if Reader is able to more records
func (rdr *Reader) IsMore() bool {
if rdr != nil {
return rdr.strtrdng && !rdr.islast
}
return false
}
//IsLast - indicate if Reader focus is on last record
func (rdr *Reader) IsLast() bool {
if rdr != nil {
return rdr.islast
}
return false
}
//IsFirst - indicate if Reader focus is on first record
func (rdr *Reader) IsFirst() bool {
if rdr != nil {
return rdr.isfirst
}
return false
}
func (rdr *Reader) internNext() (next bool, err error) {
if rdr != nil && rdr.rws != nil {
rdr.isfocused = false
if rdr.strtrdng && !rdr.islast {
rdr.isfirst = false
if err = rdr.rws.Err(); err == nil {
if err = populateRecordData(rdr); err != nil {
next = false
} else if err == nil {
next = true
rdr.islast = !rdr.rws.Next()
err = rdr.rws.Err()
next = err == nil
}
} else if next && err != nil {
next = false
}
} else {
rdr.strtrdng = true
if next = rdr.rws.Next(); next {
if err = rdr.rws.Err(); err == nil {
if err = populateRecordData(rdr); err != nil {
next = false
}
} else if next && err != nil {
next = false
}
}
if err == nil && next {
rdr.islast = !rdr.rws.Next()
err = rdr.rws.Err()
next = err == nil
}
rdr.isfirst = next
}
rdr.isfocused = err == nil && next
}
return
}
//Next return true if able to move focus of Reader to the next underlying record
// or false if the end is reached
func (rdr *Reader) Next() (next bool, err error) {
validdata := true
if rdr.isRemote() && rdr.jsndcdr != nil {
for {
if rdr.tknlvl == 3 {
if rdr.data == nil {
rdr.data = make([]interface{}, len(rdr.cls))
rdr.dispdata = make([]interface{}, len(rdr.cls))
}
if dcerr := rdr.jsndcdr.Decode(&rdr.data); dcerr == nil {
next = true
if err == nil {
if validdata = invokeDataValid(rdr.script, rdr.OnValidData, rdr.rownr, rdr); validdata {
rdr.rownr++
next = invokeRow(rdr.script, rdr.OnRow, rdr.rownr, rdr)
}
}
} else {
next = false
}
break
}
tkn, tknerr := rdr.jsndcdr.Token()
if tknerr != nil {
rdr.lasterr = tknerr
next = false
break
} else {
if dlm, dlmok := tkn.(json.Delim); dlmok {
if rdr.lastdlm = dlm.String(); rdr.lastdlm == "{" {
rdr.tknlvl++
} else if rdr.lastdlm == "}" {
rdr.tknlvl--
} else if rdr.lastdlm == "[" {
rdr.tknlvl++
} else if rdr.lastdlm == "]" {
rdr.tknlvl--
}
} else {
if s, sok := tkn.(string); sok {
if rdr.tknlvl == 1 && s != "" {
} else {
if rdr.tknlvl == 2 && s != "" {
if s == "data" {
}
} else {
}
}
}
}
}
}
if !next {
rdr.Close()
}
} else {
if next, err = rdr.internNext(); next && err == nil {
if err == nil {
if validdata = invokeDataValid(rdr.script, rdr.OnValidData, rdr.rownr, rdr); validdata {
rdr.rownr++
next = invokeRow(rdr.script, rdr.OnRow, rdr.rownr, rdr)
}
}
if !next {
rdr.Close()
}
} else if err != nil {
invokeError(rdr.script, err, rdr.OnError)
rdr.Close()
}
}
return next, err
}
func populateRecordData(rdr *Reader) (err error) {
if len(rdr.cls) > 0 {
if len(rdr.data) != len(rdr.cls) {
rdr.data = make([]interface{}, len(rdr.cls))
rdr.dataref = make([]interface{}, len(rdr.cls))
rdr.dispdata = make([]interface{}, len(rdr.cls))
}
for n := range rdr.data {
rdr.dataref[n] = &rdr.data[n]
}
if scerr := rdr.rws.Scan(rdr.dataref...); scerr != nil {
rdr.Close()
err = scerr
}
}
return
}
//ToJSON write *Reader out to json
func (rdr *Reader) ToJSON(w io.Writer) (err error) {
if w != nil {
if jsnrdr := rdr.JSONReader(); jsnrdr != nil {
func() {
defer func() { jsnrdr = nil }()
if _, err = io.Copy(w, jsnrdr); err != nil && err == io.EOF {
err = nil
}
}()
}
}
return
}
//ToJSONData write *Reader out to json of current record data
func (rdr *Reader) ToJSONData(w io.Writer, cols ...string) (err error) {
if w != nil {
dspdata := rdr.Data(cols...)
if colsl := len(cols); colsl == 0 {
cols = rdr.cls[:]
}
err = iorw.Fprint(w, "{")
if err == nil && len(dspdata) == len(cols) && len(cols) > 0 {
func() {
var bufr = iorw.NewBuffer()
defer bufr.Close()
enc := json.NewEncoder(bufr)
for cn, col := range cols {
enc.Encode(col)
if err = iorw.Fprint(w, strings.TrimSpace(bufr.String()), ":"); err != nil {
break
}
bufr.Clear()
enc.Encode(dspdata[cn])
if err = iorw.Fprint(w, strings.TrimSpace(bufr.String())); err != nil {
break
}
bufr.Clear()
if cn < len(cols)-1 {
if err = iorw.Fprint(w, ","); err != nil {
break
}
}
}
}()
}
if err == nil {
err = iorw.Fprint(w, "}")
}
}
return
}
//JSONReader return *JSONReader
func (rdr *Reader) JSONReader() (jsnrdr *JSONReader) {
jsnrdr = NewJSONReader(rdr, nil, nil)
return
}
//JSON readall *Reader and return json as string
func (rdr *Reader) JSON() (s string, err error) {
bufr := iorw.NewBuffer()
func() {
defer bufr.Close()
if err = rdr.ToJSON(bufr); err == nil {
s = bufr.String()
}
}()
return
}
//JSONData readall *Reader of current record data and return json as string
func (rdr *Reader) JSONData(cols ...string) (s string, err error) {
bufr := iorw.NewBuffer()
func() {
defer bufr.Close()
if err = rdr.ToJSONData(bufr, cols...); err == nil {
s = bufr.String()
}
}()
return
}
//CSVReader return *CSVReader
func (rdr *Reader) CSVReader(a ...interface{}) (csvrdr *CSVReader) {
csvrdr = NewCSVReader(rdr, nil, nil)
return
}
//ToCSV write *Reader out to json
func (rdr *Reader) ToCSV(w io.Writer, a ...interface{}) (err error) {
if w != nil {
if csvrdr := rdr.CSVReader(a...); csvrdr != nil {
func() {
defer func() { csvrdr = nil }()
if _, err = io.Copy(w, csvrdr); err != nil && err == io.EOF {
err = nil
}
}()
}
}
return
}
//CSV readall *Reader and return csv as string
func (rdr *Reader) CSV() (s string, err error) {
bufr := iorw.NewBuffer()
func() {
defer bufr.Close()
if err = rdr.ToCSV(bufr); err == nil {
s = bufr.String()
}
}()
return
}
//Close the Reader as well as the underlying Executor related to this Reader
//After this action the Reader is 'empty' or cleaned up in a golang world
func (rdr *Reader) Close() (err error) {
if rdr.data != nil {
rdr.data = nil
}
if rdr.dataref != nil {
rdr.dataref = nil
}
if rdr.dispdata != nil {
rdr.dispdata = nil
}
if rdr.cltpes != nil {
rdr.cltpes = nil
rdr.cls = nil
}
//if rdr.wg != nil {
// rdr.wg = nil
//}
if rdr.OnColumns != nil {
rdr.OnColumns = nil
}
if rdr.OnRow != nil {
rdr.OnRow = nil
}
if rdr.rws != nil {
rdr.rws.Close()
rdr.rws = nil
}
if rdr.Executor != nil {
if rdr.lasterr != nil {
err = rdr.lasterr
rdr.Executor.Close()
} else {
err = rdr.Executor.Close()
}
rdr.Executor = nil
}
if rdr.OnClose != nil {
rdr.OnClose(rdr)
rdr.OnClose = nil
}
return
}
var strrnstoreplace []rune = []rune{2, 3}
var strnstoignore []rune = []rune{0, 8}
func cleanupStringData(str string) (strcleaned string) {
strcleaned = str
if strcleaned != "" {
strns := []rune(str)
n := 0
nl := len(strns)
for n < nl {
rn := strns[n]
n++
for rnrpls := range strrnstoreplace {
if rn == strrnstoreplace[rnrpls] {
strns[n-1] = ' '
break
}
}
for rnrignr := range strnstoignore {
if rn == strnstoignore[rnrignr] {
strns = append(strns[:(n-1)], strns[n:]...)
if nl = len(strns); n == nl {
break
}
n--
break
}
}
}
strcleaned = strings.TrimSpace(string(strns))
}
return
}
func castSQLTypeValue(valToCast interface{}, colType *ColumnType) (castedVal interface{}) {
if valToCast != nil {
if d, dok := valToCast.([]uint8); dok {
castedVal = cleanupStringData(string(d))
} else if sd, dok := valToCast.(string); dok {
castedVal = cleanupStringData(sd)
} else if dtime, dok := valToCast.(time.Time); dok {
castedVal = dtime.Format("2006-01-02T15:04:05")
} else if djsn, djsnok := valToCast.([]byte); djsnok {
if dv, dverr := json.Marshal(djsn); dverr == nil {
castedVal = dv
} else {
castedVal = djsn
}
} else {
castedVal = valToCast
}
} else {
castedVal = valToCast
}
return castedVal
}
//ColumnTypeHandle interface defining column type api
type ColumnTypeHandle interface {
Name() string
Numeric() bool
HasNullable() bool
HasLength() bool
HasPrecisionScale() bool
Nullable() bool
Length() int64
DatabaseType() string
Precision() int64
Scale() int64
Type() reflect.Type
}
//ColumnType structure defining column definition
type ColumnType struct {
name string
hasNullable bool
hasLength bool
hasPrecisionScale bool
nullable bool
length int64
databaseType string
precision int64
scale int64
scanType reflect.Type
}
//Name ColumnType.Name()
func (colType *ColumnType) Name() string {
return colType.name
}
//Numeric ColumnType is Numeric() bool
func (colType *ColumnType) Numeric() bool {
if colType.hasPrecisionScale {
return true
}
return !strings.Contains(colType.databaseType, "CHAR") && !strings.Contains(colType.databaseType, "DATE") && !strings.Contains(colType.databaseType, "TIME")
}
//HasNullable ColumnType content has NULL able content
func (colType *ColumnType) HasNullable() bool {
return colType.hasNullable
}
//HasLength ColumnType content has Length definition
func (colType *ColumnType) HasLength() bool {
return colType.hasLength
}
//HasPrecisionScale ColumnType content has PrecisionScale
func (colType *ColumnType) HasPrecisionScale() bool {
return colType.hasPrecisionScale
}
//Nullable ColumnType content is Nullable
func (colType *ColumnType) Nullable() bool {
return colType.nullable
}
//Length ColumnType content lenth must be used in conjunction with HasLength
func (colType *ColumnType) Length() int64 {
return colType.length
}
//DatabaseType ColumnType underlying db type as defined by driver of Connection
func (colType *ColumnType) DatabaseType() string {
return colType.databaseType
}
//Precision ColumnType numeric Precision. Used in conjunction with HasPrecisionScale
func (colType *ColumnType) Precision() int64 {
return colType.precision
}
//Scale ColumnType Scale. Used in conjunction with HasPrecisionScale
func (colType *ColumnType) Scale() int64 {
return colType.scale
}
//Type ColumnType reflect.Type as specified by golang sql/database
func (colType *ColumnType) Type() reflect.Type {
return colType.scanType
}
//Field - struct
type Field struct {
rdr *Reader
index int
}
//Value - of Field
func (fld *Field) Value() (val interface{}) {
if fld != nil && fld.rdr != nil && (fld.index > -1 && fld.index < len(fld.rdr.data)) {
val = fld.rdr.dispdata[fld.index]
}
return
}
//Name - of Field
func (fld *Field) Name() (nme string) {
if fld != nil && fld.rdr != nil && (fld.index > -1 && fld.index < len(fld.rdr.cls)) {
nme = fld.rdr.cls[fld.index]
}
return
}
//Type - ColumnType of Field
func (fld *Field) Type() (tpe *ColumnType) {
if fld != nil && fld.rdr != nil && (fld.index > -1 && fld.index < len(fld.rdr.cltpes)) {
tpe = fld.rdr.cltpes[fld.index]
}
return
}
func newReader(exctr *Executor) (rdr *Reader) {
rdr = &Reader{Executor: exctr, rownr: 0}
return
}
//Repeat - repeat last query by repopulating parameters but dont regenerate last statement
func (rdr *Reader) Repeat(a ...interface{}) (err error) {
rdr.execute()
err = rdr.lasterr
return
}
func (rdr *Reader) execute() (err error) {
if rws, cltpes, cls := rdr.Executor.execute(true); rws != nil {
if err = rdr.lasterr; err == nil {
rdr.rownr = 0
rdr.rws = rws
if len(cls) > 0 {
rdr.cls = cls[:]
rdr.cltpes = cltpes[:]
invokeSuccess(rdr.script, rdr.OnSuccess, rdr)
invokeColumns(rdr.script, rdr.OnColumns, rdr)
}
} else if err != nil {
invokeError(rdr.script, err, rdr.OnError)
}
} else if rdr.isRemote() && rdr.jsndcdr != nil {
if err = rdr.lasterr; err == nil {
if len(cls) > 0 {
rdr.cls = cls[:]
rdr.cltpes = cltpes
invokeSuccess(rdr.script, rdr.OnSuccess, rdr)
invokeColumns(rdr.script, rdr.OnColumns, rdr)
}
}
}
return
}
func invokeDataValid(script active.Runtime, ondatavalid interface{}, rownr int64, rdr *Reader) (validdata bool) {
if ondatavalid != nil {
if fncdatavalid, fncdatavalidok := ondatavalid.(func(*Reader, int64) bool); fncdatavalidok {
validdata = fncdatavalid(rdr, rownr)
} else if script != nil {
invval := script.InvokeFunction(ondatavalid, rdr, rownr)
if isvalid, isdoneok := invval.(bool); isdoneok {
validdata = isvalid
} else {
validdata = true
}
}
} else {
validdata = true
}
return
}
func invokeRow(script active.Runtime, onrow interface{}, rownr int64, rdr *Reader) (nextrow bool) {
if onrow != nil {
if fncrow, fncrowsok := onrow.(func(*Reader, int64)); fncrowsok {
fncrow(rdr, rownr)
nextrow = true
} else if fncrownext, fncrowsnextok := onrow.(func(*Reader, int64) bool); fncrowsnextok {
nextrow = !fncrownext(rdr, rownr)
} else if script != nil {
invval := script.InvokeFunction(onrow, rdr, rownr)
if isdone, isdoneok := invval.(bool); isdoneok {
if isdone {
nextrow = false
} else {
nextrow = true
}
} else {
nextrow = true
}
}
} else {
nextrow = true
}
return
}
func invokeColumns(script active.Runtime, oncolumns interface{}, rdr *Reader) {
if oncolumns != nil {
if fnccolumns, fnccolumnssok := oncolumns.(func(*Reader)); fnccolumnssok {
fnccolumns(rdr)
} else if script != nil {
script.InvokeFunction(oncolumns, rdr)
}
}
}
func columnTypes(sqlcoltypes []*sql.ColumnType, cls []string) (coltypes []*ColumnType) {
coltypes = make([]*ColumnType, len(sqlcoltypes))
for n := range sqlcoltypes {
ctype := sqlcoltypes[n]
coltype := &ColumnType{}
coltype.databaseType = ctype.DatabaseTypeName()
coltype.length, coltype.hasLength = ctype.Length()
coltype.name = ctype.Name()
coltype.databaseType = ctype.DatabaseTypeName()
coltype.nullable, coltype.hasNullable = ctype.Nullable()
coltype.precision, coltype.scale, coltype.hasPrecisionScale = ctype.DecimalSize()
coltype.scanType = ctype.ScanType()
coltypes[n] = coltype
}
return coltypes
}