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convert.go
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convert.go
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package driver
import (
"database/sql"
"database/sql/driver"
"fmt"
"reflect"
p "github.com/SAP/go-hdb/driver/internal/protocol"
"github.com/SAP/go-hdb/driver/internal/protocol/levenshtein"
"golang.org/x/text/transform"
)
// TODO: test.
func reorderNVArgs(pos int, name string, nvargs []driver.NamedValue) {
for i := pos; i < len(nvargs); i++ {
if nvargs[i].Name != "" && nvargs[i].Name == name {
tmp := nvargs[i]
for j := i; j > pos; j-- {
nvargs[j] = nvargs[j-1]
}
nvargs[pos] = tmp
}
}
}
// This function is take from the database/sql package.
// The Elem() test is not needed bacause the function is only
// called for values implementing the driver.Valuer interface.
func callValuerValue(vr driver.Valuer) (v driver.Value, err error) {
if rv := reflect.ValueOf(vr); rv.Kind() == reflect.Pointer && rv.IsNil() {
// && rv.Type().Elem().Implements(valuerReflectType) {
return nil, nil
}
return vr.Value()
}
func convertArg(field *p.ParameterField, arg any, cesu8Encoder transform.Transformer) (any, error) {
// let fields with own value converter convert themselves first (e.g. NullInt64, ...)
// .check nested Value converters as well (e.g. sql.Null[T] has driver.Decimal as value)
for {
valuer, ok := arg.(driver.Valuer)
if !ok {
break
}
var err error
arg, err = callValuerValue(valuer)
if err != nil {
return nil, err
}
}
// convert field
return field.Convert(arg, cesu8Encoder)
}
/*
convertExecArgs
- all fields need to be input fields
- out parameters are not supported
- named parameters are not supported
*/
func convertExecArgs(fields []*p.ParameterField, nvargs []driver.NamedValue, cesu8Encoder transform.Transformer, lobChunkSize int) ([]int, error) {
numField := len(fields)
if (len(nvargs) % numField) != 0 {
return nil, fmt.Errorf("invalid number of arguments %d - multiple of %d expected", len(nvargs), numField)
}
numRow := len(nvargs) / numField
addLobDataRecs := []int{}
for i := 0; i < numRow; i++ {
hasAddLobData := false
for j, field := range fields {
nvarg := &nvargs[(i*numField)+j]
if field.Out() {
return nil, fmt.Errorf("invalid parameter %s - output not allowed", field)
}
if _, ok := nvarg.Value.(sql.Out); ok {
return nil, fmt.Errorf("invalid argument %v - output not allowed", nvarg)
}
if nvarg.Name != "" {
return nil, fmt.Errorf("invalid argument %s - named parameters not supported", nvarg.Name)
}
var err error
if nvarg.Value, err = convertArg(field, nvarg.Value, cesu8Encoder); err != nil {
return nil, fmt.Errorf("field %s conversion error - %w", field, err)
}
// fetch first lob chunk
if lobInDescr, ok := nvarg.Value.(*p.LobInDescr); ok {
if err := lobInDescr.FetchNext(lobChunkSize); err != nil {
return nil, err
}
if !lobInDescr.IsLastData() {
hasAddLobData = true
}
}
}
if hasAddLobData || i == numRow-1 {
addLobDataRecs = append(addLobDataRecs, i)
}
}
return addLobDataRecs, nil
}
/*
_convertQueryArgs
- all fields need to be input fields
- out parameters are not supported
- named parameters are not supported
*/
func convertQueryArgs(fields []*p.ParameterField, nvargs []driver.NamedValue, cesu8Encoder transform.Transformer, lobChunkSize int) error {
if len(nvargs) != len(fields) {
return fmt.Errorf("invalid number of arguments %d - %d expected", len(nvargs), len(fields))
}
for i, field := range fields {
nvarg := &nvargs[i]
if field.Out() {
return fmt.Errorf("invalid parameter %s - output not allowed", field)
}
if _, ok := nvarg.Value.(sql.Out); ok {
return fmt.Errorf("invalid argument %v - output not allowed", nvarg)
}
if nvarg.Name != "" {
return fmt.Errorf("invalid argument %s - named parameters not supported", nvarg.Name)
}
var err error
if nvarg.Value, err = convertArg(field, nvarg.Value, cesu8Encoder); err != nil {
return fmt.Errorf("field %s conversion error - %w", field, err)
}
// fetch first lob chunk
if lobInDescr, ok := nvarg.Value.(*p.LobInDescr); ok {
if err := lobInDescr.FetchNext(lobChunkSize); err != nil {
return err
}
}
}
return nil
}
// convertCallArgs
// - fields could be input or output fields
// - number of args needs to be equal to number of fields
// - named parameters are supported
type callArgs struct {
inFields, outFields []*p.ParameterField
inArgs, outArgs []driver.NamedValue
}
func newCallArgs() *callArgs {
return &callArgs{
inFields: []*p.ParameterField{},
outFields: []*p.ParameterField{},
inArgs: []driver.NamedValue{},
outArgs: []driver.NamedValue{},
}
}
func convertCallArgs(fields []*p.ParameterField, nvargs []driver.NamedValue, cesu8Encoder transform.Transformer, lobChunkSize int) (*callArgs, error) {
callArgs := newCallArgs()
if len(nvargs) < len(fields) { // number of fields needs to match number of args or be greater (add table output args)
return nil, fmt.Errorf("invalid number of arguments %d - %d expected", len(nvargs), len(fields))
}
prmnvargs := nvargs[:len(fields)]
for i, field := range fields {
reorderNVArgs(i, field.Name(), prmnvargs)
nvarg := &prmnvargs[i]
if nvarg.Name != "" && nvarg.Name != field.Name() {
return nil, fmt.Errorf("invalid argument name %s - did you mean %s?",
nvarg.Name,
levenshtein.MinString(fields, func(field *p.ParameterField) string { return field.Name() }, nvarg.Name, false),
)
}
out, isOut := nvarg.Value.(sql.Out)
var err error
if field.In() {
if isOut {
if !out.In {
return nil, fmt.Errorf("argument field %s mismatch - use in argument with out field", field)
}
if out.Dest, err = convertArg(field, out.Dest, cesu8Encoder); err != nil {
return nil, fmt.Errorf("field %s conversion error - %w", field, err)
}
} else {
if nvarg.Value, err = convertArg(field, nvarg.Value, cesu8Encoder); err != nil {
return nil, fmt.Errorf("field %s conversion error - %w", field, err)
}
}
// fetch first lob chunk
if lobInDescr, ok := nvarg.Value.(*p.LobInDescr); ok {
if err := lobInDescr.FetchNext(lobChunkSize); err != nil {
return nil, err
}
}
callArgs.inArgs = append(callArgs.inArgs, *nvarg)
callArgs.inFields = append(callArgs.inFields, field)
}
if field.Out() {
if !isOut {
return nil, fmt.Errorf("argument field %s mismatch - use out argument with non-out field", field)
}
if _, ok := out.Dest.(*sql.Rows); ok {
return nil, fmt.Errorf("invalid output parameter type %T", out.Dest)
}
callArgs.outArgs = append(callArgs.outArgs, *nvarg)
callArgs.outFields = append(callArgs.outFields, field)
}
}
// table output args
for i := len(fields); i < len(nvargs); i++ {
nvarg := &nvargs[i]
out, ok := nvarg.Value.(sql.Out)
if !ok {
return nil, fmt.Errorf("invalid parameter type %T at %d - output parameter expected", nvarg.Value, i)
}
if _, ok := out.Dest.(*sql.Rows); !ok {
return nil, fmt.Errorf("invalid output parameter %T at %d - sql.Rows expected", out.Dest, i)
}
callArgs.outArgs = append(callArgs.outArgs, *nvarg)
}
return callArgs, nil
}