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to.go
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package sql
import (
"database/sql"
"fmt"
"strings"
"github.com/influxdata/flux"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/execute"
"github.com/influxdata/flux/internal/errors"
"github.com/influxdata/flux/plan"
"github.com/influxdata/flux/runtime"
"github.com/influxdata/flux/values"
)
const (
ToSQLKind = "toSQL"
DefaultBatchSize = 10000 //TODO: decide if this should be kept low enough for the lowest (SQLite), or not.
)
type ToSQLOpSpec struct {
DriverName string `json:"driverName,omitempty"`
DataSourceName string `json:"dataSourcename,omitempty"`
Table string `json:"table,omitempty"`
BatchSize int `json:"batchSize,omitempty"`
}
func init() {
toSQLSignature := runtime.MustLookupBuiltinType("sql", "to")
runtime.RegisterPackageValue("sql", "to", flux.MustValue(flux.FunctionValueWithSideEffect(ToSQLKind, createToSQLOpSpec, toSQLSignature)))
flux.RegisterOpSpec(ToSQLKind, func() flux.OperationSpec { return &ToSQLOpSpec{} })
plan.RegisterProcedureSpecWithSideEffect(ToSQLKind, newToSQLProcedure, ToSQLKind)
execute.RegisterTransformation(ToSQLKind, createToSQLTransformation)
}
func (o *ToSQLOpSpec) ReadArgs(args flux.Arguments) error {
var err error
o.DriverName, err = args.GetRequiredString("driverName")
if err != nil {
return err
}
if len(o.DriverName) == 0 {
return errors.New(codes.Invalid, "invalid driver name")
}
o.DataSourceName, err = args.GetRequiredString("dataSourceName")
if err != nil {
return err
}
if len(o.DataSourceName) == 0 {
return errors.New(codes.Invalid, "invalid data source name")
}
o.Table, err = args.GetRequiredString("table")
if err != nil {
return err
}
if len(o.Table) == 0 {
return errors.New(codes.Invalid, "invalid table name")
}
b, _, err := args.GetInt("batchSize")
if err != nil {
return err
}
if b <= 0 {
// set default as argument we not supplied
o.BatchSize = DefaultBatchSize
} else {
o.BatchSize = int(b)
}
return err
}
func createToSQLOpSpec(args flux.Arguments, a *flux.Administration) (flux.OperationSpec, error) {
if err := a.AddParentFromArgs(args); err != nil {
return nil, err
}
s := new(ToSQLOpSpec)
if err := s.ReadArgs(args); err != nil {
return nil, err
}
return s, nil
}
func (ToSQLOpSpec) Kind() flux.OperationKind {
return ToSQLKind
}
type ToSQLProcedureSpec struct {
plan.DefaultCost
Spec *ToSQLOpSpec
}
func (o *ToSQLProcedureSpec) Kind() plan.ProcedureKind {
return ToSQLKind
}
func (o *ToSQLProcedureSpec) Copy() plan.ProcedureSpec {
s := o.Spec
res := &ToSQLProcedureSpec{
Spec: &ToSQLOpSpec{
DriverName: s.DriverName,
DataSourceName: s.DataSourceName,
Table: s.Table,
BatchSize: s.BatchSize,
},
}
return res
}
func newToSQLProcedure(qs flux.OperationSpec, a plan.Administration) (plan.ProcedureSpec, error) {
spec, ok := qs.(*ToSQLOpSpec)
if !ok && spec != nil {
return nil, errors.Newf(codes.Internal, "invalid spec type %T", qs)
}
return &ToSQLProcedureSpec{Spec: spec}, nil
}
func createToSQLTransformation(id execute.DatasetID, mode execute.AccumulationMode, spec plan.ProcedureSpec, a execute.Administration) (execute.Transformation, execute.Dataset, error) {
s, ok := spec.(*ToSQLProcedureSpec)
if !ok {
return nil, nil, errors.Newf(codes.Internal, "invalid spec type %T", spec)
}
cache := execute.NewTableBuilderCache(a.Allocator())
d := execute.NewDataset(id, mode, cache)
deps := flux.GetDependencies(a.Context())
t, err := NewToSQLTransformation(d, deps, cache, s)
if err != nil {
return nil, nil, err
}
return t, d, nil
}
type ToSQLTransformation struct {
execute.ExecutionNode
d execute.Dataset
cache execute.TableBuilderCache
spec *ToSQLProcedureSpec
db *sql.DB
tx *sql.Tx
}
func (t *ToSQLTransformation) RetractTable(id execute.DatasetID, key flux.GroupKey) error {
return t.d.RetractTable(key)
}
func NewToSQLTransformation(d execute.Dataset, deps flux.Dependencies, cache execute.TableBuilderCache, spec *ToSQLProcedureSpec) (*ToSQLTransformation, error) {
validator, err := deps.URLValidator()
if err != nil {
return nil, err
}
if err := validateDataSource(validator, spec.Spec.DriverName, spec.Spec.DataSourceName); err != nil {
return nil, err
}
// validate the data driver name and source name.
db, err := getOpenFunc(spec.Spec.DriverName, spec.Spec.DataSourceName)()
if err != nil {
return nil, err
}
var tx *sql.Tx
if supportsTx(spec.Spec.DriverName) {
tx, err = db.Begin()
if err != nil {
return nil, err
}
}
return &ToSQLTransformation{
d: d,
cache: cache,
spec: spec,
db: db,
tx: tx,
}, nil
}
type idxType struct {
Idx int
Type flux.ColType
}
func (t *ToSQLTransformation) Process(id execute.DatasetID, tbl flux.Table) (err error) {
colNames, valStrings, valArgs, err := CreateInsertComponents(t, tbl)
if err != nil {
return err
}
for i := range valStrings {
if err := ExecuteQueries(t.tx, t.spec.Spec, colNames, &valStrings[i], &valArgs[i]); err != nil {
return err
}
}
return err
}
func (t *ToSQLTransformation) UpdateWatermark(id execute.DatasetID, pt execute.Time) error {
return t.d.UpdateWatermark(pt)
}
func (t *ToSQLTransformation) UpdateProcessingTime(id execute.DatasetID, pt execute.Time) error {
return t.d.UpdateProcessingTime(pt)
}
func (t *ToSQLTransformation) Finish(id execute.DatasetID, err error) {
if supportsTx(t.spec.Spec.DriverName) {
var txErr error
if err == nil {
txErr = t.tx.Commit()
} else {
txErr = t.tx.Rollback()
}
if txErr != nil {
err = errors.Wrap(err, codes.Inherit, txErr)
}
if dbErr := t.db.Close(); dbErr != nil {
err = errors.Wrap(err, codes.Inherit, dbErr)
}
}
t.d.Finish(err)
}
type translationFunc func(f flux.ColType, colname string) (string, error)
func correctBatchSize(batchSize, numberCols int) int {
/*
BatchSize for the DB is the number of parameters that can be queued within each call to Exec.
As each row you send has a parameter count equal to the number of columns (i.e. the number of "?" used in the insert statement), and some DBs
have a default limit on the number of parameters which can be queued before calling Exec; SQLite, for example, has a default of 999 (can only be changed
at compile time).
So if the row width is 10 columns, the maximum Batchsize would be:
(999 - row_width) / row_width = 98 rows. (with 0.9 of a row unused)
and,
(1000 - row_width) / row_width = 99 rows. (no remainder)
NOTE: Given a statement like:
INSERT INTO data_table (now,values,difference) VALUES(?,?,?)
each iteration of EXEC() would add 3 new values (one for each of the '?' placeholders) - but the final "parameter count" includes the initial 3 column names.
this is why the calculation subracts an initial "column width" from the supplied Batchsize.
Sending more would result in the call to Exec returning a "too many SQL variables" error, and the transaction would be rolled-back / aborted
*/
if batchSize < numberCols {
// if this is because the width of a single row is very large, pass to DB driver, and if this exceeds the number of allowed parameters
// this will be fed back to the user to handle - possibly by reducing the row width
return numberCols
}
return (batchSize - numberCols) / numberCols
}
func getTranslationFunc(driverName string) (func() translationFunc, error) {
// simply return the translationFunc that corresponds to the driver type
switch driverName {
case "sqlite3":
return SqliteColumnTranslateFunc, nil
case "postgres", "sqlmock":
return PostgresColumnTranslateFunc, nil
case "mysql":
return MysqlColumnTranslateFunc, nil
case "snowflake":
return SnowflakeColumnTranslateFunc, nil
case "mssql", "sqlserver":
return MssqlColumnTranslateFunc, nil
case "awsathena": // read-only support for AWS Athena (see awsathena.go)
return nil, errors.Newf(codes.Invalid, "writing is not supported for %s", driverName)
case "bigquery":
return BigQueryColumnTranslateFunc, nil
case "hdb":
return HdbColumnTranslateFunc, nil
default:
return nil, errors.Newf(codes.Internal, "invalid driverName: %s", driverName)
}
}
func supportsTx(driverName string) bool {
return driverName != "sqlmock" && driverName != "awsathena"
}
func CreateInsertComponents(t *ToSQLTransformation, tbl flux.Table) (colNames []string, valStringArray [][]string, valArgsArray [][]interface{}, err error) {
cols := tbl.Cols()
batchSize := correctBatchSize(t.spec.Spec.BatchSize, len(cols))
labels := make(map[string]idxType, len(cols))
var questionMarks, newSQLTableCols []string
for i, col := range cols {
labels[col.Label] = idxType{Idx: i, Type: col.Type}
questionMarks = append(questionMarks, "?")
colNames = append(colNames, col.Label)
driverName := t.spec.Spec.DriverName
// the following allows driver-specific type errors (of which there can be MANY) to be returned, rather than the default of invalid type
translateColumn, err := getTranslationFunc(driverName)
if err != nil {
return nil, nil, nil, err
}
switch col.Type {
case flux.TFloat, flux.TInt, flux.TUInt, flux.TString, flux.TBool, flux.TTime:
// each type is handled within the function - precise mapping is handled within each driver's implementation
v, err := translateColumn()(col.Type, col.Label)
if err != nil {
return nil, nil, nil, err
}
newSQLTableCols = append(newSQLTableCols, v)
default:
return nil, nil, nil, errors.Newf(codes.Internal, "invalid type for column %s", col.Label)
}
}
// Creates the placeholders for values in the query
// eg: (?,?)
valuePlaceHolders := fmt.Sprintf("(%s)", strings.Join(questionMarks, ","))
builder, new := t.cache.TableBuilder(tbl.Key())
if new {
if err := execute.AddTableCols(tbl, builder); err != nil {
return nil, nil, nil, err
}
}
if err := tbl.Do(func(er flux.ColReader) error {
l := er.Len()
// valueStrings is an array of valuePlaceHolders, which will be joined later
valueStrings := make([]string, 0, l)
// valueArgs holds all the values to pass into the query
valueArgs := make([]interface{}, 0, l*len(cols))
if t.spec.Spec.DriverName != "sqlmock" {
var q string
if isMssqlDriver(t.spec.Spec.DriverName) { // SQL Server does not support IF NOT EXIST
q = fmt.Sprintf("IF OBJECT_ID('%s', 'U') IS NULL BEGIN CREATE TABLE %s (%s) END", t.spec.Spec.Table, t.spec.Spec.Table, strings.Join(newSQLTableCols, ","))
} else if t.spec.Spec.DriverName == "hdb" { // SAP HANA does not support IF NOT EXIST
// wrap CREATE TABLE statement with HDB-specific "if not exists" SQLScript check
q = fmt.Sprintf("CREATE TABLE %s (%s)", hdbEscapeName(t.spec.Spec.Table, true), strings.Join(newSQLTableCols, ","))
q = hdbAddIfNotExist(t.spec.Spec.Table, q)
// SAP HANA does not support INSERT/UPDATE batching via a single SQL command
batchSize = 1
} else {
q = fmt.Sprintf("CREATE TABLE IF NOT EXISTS %s (%s)", t.spec.Spec.Table, strings.Join(newSQLTableCols, ","))
}
_, err = t.tx.Exec(q)
if err != nil {
return err
}
}
for i := 0; i < l; i++ {
valueStrings = append(valueStrings, valuePlaceHolders)
for j, col := range er.Cols() {
switch col.Type {
case flux.TFloat:
if er.Floats(j).IsNull(i) {
valueArgs = append(valueArgs, nil)
break
}
valueArgs = append(valueArgs, er.Floats(j).Value(i))
case flux.TInt:
if er.Ints(j).IsNull(i) {
valueArgs = append(valueArgs, nil)
break
}
valueArgs = append(valueArgs, er.Ints(j).Value(i))
case flux.TUInt:
if er.UInts(j).IsNull(i) {
valueArgs = append(valueArgs, nil)
break
}
valueArgs = append(valueArgs, er.UInts(j).Value(i))
case flux.TString:
if er.Strings(j).IsNull(i) {
valueArgs = append(valueArgs, nil)
break
}
valueArgs = append(valueArgs, er.Strings(j).ValueString(i))
case flux.TTime:
if er.Times(j).IsNull(i) {
valueArgs = append(valueArgs, nil)
break
}
valueArgs = append(valueArgs, values.Time(er.Times(j).Value(i)).Time())
case flux.TBool:
if er.Bools(j).IsNull(i) {
valueArgs = append(valueArgs, nil)
break
}
valueArgs = append(valueArgs, er.Bools(j).Value(i))
default:
return errors.Newf(codes.FailedPrecondition, "invalid type for column %s", col.Label)
}
}
if err := execute.AppendRecord(i, er, builder); err != nil {
return err
}
if (i != 0 && i%batchSize == 0) || (batchSize == 1) {
// create "mini batches" of values - each one represents a single db.Exec to SQL
valArgsArray = append(valArgsArray, valueArgs)
valStringArray = append(valStringArray, valueStrings)
valueArgs = make([]interface{}, 0)
valueStrings = make([]string, 0)
}
}
if len(valueArgs) > 0 && len(valueStrings) > 0 {
valArgsArray = append(valArgsArray, valueArgs)
valStringArray = append(valStringArray, valueStrings)
}
return nil
}); err != nil {
return nil, nil, nil, err
}
return colNames, valStringArray, valArgsArray, err
}
func ExecuteQueries(tx *sql.Tx, s *ToSQLOpSpec, colNames []string, valueStrings *[]string, valueArgs *[]interface{}) (err error) {
concatValueStrings := strings.Join(*valueStrings, ",")
// PostgreSQL uses $n instead of ? for placeholders
if s.DriverName == "postgres" {
for pqCounter := 1; strings.Contains(concatValueStrings, "?"); pqCounter++ {
concatValueStrings = strings.Replace(concatValueStrings, "?", fmt.Sprintf("$%v", pqCounter), 1)
}
}
// SQLServer uses @p instead of ? for placeholders
if isMssqlDriver(s.DriverName) {
for pqCounter := 1; strings.Contains(concatValueStrings, "?"); pqCounter++ {
concatValueStrings = strings.Replace(concatValueStrings, "?", fmt.Sprintf("@p%v", pqCounter), 1)
}
}
query := fmt.Sprintf("INSERT INTO %s (%s) VALUES %s", s.Table, strings.Join(colNames, ","), concatValueStrings)
if isMssqlDriver(s.DriverName) && mssqlCheckParameter(s.DataSourceName, mssqlIdentityInsertEnabled) {
prologue := fmt.Sprintf("DECLARE @tableHasIdentity INT = OBJECTPROPERTY(OBJECT_ID('%s'), 'TableHasIdentity'); IF @tableHasIdentity = 1 BEGIN SET IDENTITY_INSERT %s ON END", s.Table, s.Table)
epilogue := fmt.Sprintf("IF @tableHasIdentity = 1 BEGIN SET IDENTITY_INSERT %s OFF END", s.Table)
query = strings.Join([]string{prologue, query, epilogue}, "; ")
}
if s.DriverName != "sqlmock" {
_, err := tx.Exec(query, *valueArgs...)
if err != nil {
// this err which is extremely helpful as it comes from the SQL driver should be
// bubbled up further up the stack so user can see the issue
if rbErr := tx.Rollback(); rbErr != nil {
return errors.Newf(codes.Aborted, "transaction failed (%s) while recovering from %s", err, rbErr)
}
return err
}
}
return err
}