turso

vendor/github.com/tursodatabase/libsql-client-go/libsql/internal/http/driver.go

@@ -0,0 +1,11 @@
+package http
+
+import (
+	"database/sql/driver"
+
+	"github.com/tursodatabase/libsql-client-go/libsql/internal/http/hranaV2"
+)
+
+func Connect(url, jwt, host string) driver.Conn {
+	return hranaV2.Connect(url, jwt, host)
+}

vendor/github.com/tursodatabase/libsql-client-go/libsql/internal/http/hranaV2/hranaV2.go

@@ -0,0 +1,476 @@
+package hranaV2
+
+import (
+	"bytes"
+	"context"
+	"database/sql"
+	"database/sql/driver"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	net_url "net/url"
+	"runtime/debug"
+	"strings"
+	"time"
+
+	"github.com/tursodatabase/libsql-client-go/libsql/internal/hrana"
+	"github.com/tursodatabase/libsql-client-go/libsql/internal/http/shared"
+)
+
+var commitHash string
+
+func init() {
+	if info, ok := debug.ReadBuildInfo(); ok {
+		for _, module := range info.Deps {
+			if module.Path == "github.com/tursodatabase/libsql-client-go" {
+				parts := strings.Split(module.Version, "-")
+				if len(parts) == 3 {
+					commitHash = parts[2][:6]
+					return
+				}
+			}
+		}
+	}
+	commitHash = "unknown"
+}
+
+func Connect(url, jwt, host string) driver.Conn {
+	return &hranaV2Conn{url, jwt, host, "", false, 0}
+}
+
+type hranaV2Stmt struct {
+	conn     *hranaV2Conn
+	numInput int
+	sql      string
+}
+
+func (s *hranaV2Stmt) Close() error {
+	return nil
+}
+
+func (s *hranaV2Stmt) NumInput() int {
+	return s.numInput
+}
+
+func convertToNamed(args []driver.Value) []driver.NamedValue {
+	if len(args) == 0 {
+		return nil
+	}
+	var result []driver.NamedValue
+	for idx := range args {
+		result = append(result, driver.NamedValue{Ordinal: idx, Value: args[idx]})
+	}
+	return result
+}
+
+func (s *hranaV2Stmt) Exec(args []driver.Value) (driver.Result, error) {
+	return s.ExecContext(context.Background(), convertToNamed(args))
+}
+
+func (s *hranaV2Stmt) Query(args []driver.Value) (driver.Rows, error) {
+	return s.QueryContext(context.Background(), convertToNamed(args))
+}
+
+func (s *hranaV2Stmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
+	return s.conn.ExecContext(ctx, s.sql, args)
+}
+
+func (s *hranaV2Stmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
+	return s.conn.QueryContext(ctx, s.sql, args)
+}
+
+type hranaV2Conn struct {
+	url              string
+	jwt              string
+	host             string
+	baton            string
+	streamClosed     bool
+	replicationIndex uint64
+}
+
+func (h *hranaV2Conn) Ping() error {
+	return h.PingContext(context.Background())
+}
+
+func (h *hranaV2Conn) PingContext(ctx context.Context) error {
+	_, err := h.executeStmt(ctx, "SELECT 1", nil, false)
+	return err
+}
+
+func (h *hranaV2Conn) Prepare(query string) (driver.Stmt, error) {
+	return h.PrepareContext(context.Background(), query)
+}
+
+func (h *hranaV2Conn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
+	stmts, paramInfos, err := shared.ParseStatement(query)
+	if err != nil {
+		return nil, err
+	}
+	if len(stmts) != 1 {
+		return nil, fmt.Errorf("only one statement is supported got %d", len(stmts))
+	}
+	numInput := -1
+	if len(paramInfos[0].NamedParameters) == 0 {
+		numInput = paramInfos[0].PositionalParametersCount
+	}
+	return &hranaV2Stmt{h, numInput, query}, nil
+}
+
+func (h *hranaV2Conn) Close() error {
+	if h.baton != "" {
+		go func(baton, url, jwt, host string) {
+			msg := hrana.PipelineRequest{Baton: baton}
+			msg.Add(hrana.CloseStream())
+			_, _, _ = sendPipelineRequest(context.Background(), &msg, url, jwt, host)
+		}(h.baton, h.url, h.jwt, h.host)
+	}
+	return nil
+}
+
+func (h *hranaV2Conn) Begin() (driver.Tx, error) {
+	return h.BeginTx(context.Background(), driver.TxOptions{})
+}
+
+type hranaV2Tx struct {
+	conn *hranaV2Conn
+}
+
+func (h hranaV2Tx) Commit() error {
+	_, err := h.conn.ExecContext(context.Background(), "COMMIT", nil)
+	return err
+}
+
+func (h hranaV2Tx) Rollback() error {
+	_, err := h.conn.ExecContext(context.Background(), "ROLLBACK", nil)
+	return err
+}
+
+func (h *hranaV2Conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
+	if opts.ReadOnly {
+		return nil, fmt.Errorf("read only transactions are not supported")
+	}
+	if opts.Isolation != driver.IsolationLevel(sql.LevelDefault) {
+		return nil, fmt.Errorf("isolation level %d is not supported", opts.Isolation)
+	}
+	_, err := h.ExecContext(ctx, "BEGIN", nil)
+	if err != nil {
+		return nil, err
+	}
+	return &hranaV2Tx{h}, nil
+}
+
+func (h *hranaV2Conn) sendPipelineRequest(ctx context.Context, msg *hrana.PipelineRequest, streamClose bool) (*hrana.PipelineResponse, error) {
+	if h.streamClosed {
+		// If the stream is closed, we can't send any more requests using this connection.
+		return nil, fmt.Errorf("stream is closed: %w", driver.ErrBadConn)
+	}
+	if h.baton != "" {
+		msg.Baton = h.baton
+	}
+	if h.replicationIndex > 0 {
+		addReplicationIndex(msg, h.replicationIndex)
+	}
+	result, streamClosed, err := sendPipelineRequest(ctx, msg, h.url, h.jwt, h.host)
+	if streamClosed {
+		h.streamClosed = true
+	}
+	if err != nil {
+		return nil, err
+	}
+	h.baton = result.Baton
+	if result.Baton == "" && !streamClose {
+		// We need to remember that the stream is closed so we don't try to send any more requests using this connection.
+		h.streamClosed = true
+	}
+	if result.BaseUrl != "" {
+		h.url = result.BaseUrl
+	}
+	if idx := getReplicationIndex(&result); idx > h.replicationIndex {
+		h.replicationIndex = idx
+	}
+	return &result, nil
+}
+
+func addReplicationIndex(msg *hrana.PipelineRequest, replicationIndex uint64) {
+	for i := range msg.Requests {
+		if msg.Requests[i].Stmt != nil && msg.Requests[i].Stmt.ReplicationIndex == nil {
+			msg.Requests[i].Stmt.ReplicationIndex = &replicationIndex
+		} else if msg.Requests[i].Batch != nil && msg.Requests[i].Batch.ReplicationIndex == nil {
+			msg.Requests[i].Batch.ReplicationIndex = &replicationIndex
+		}
+	}
+}
+
+func getReplicationIndex(response *hrana.PipelineResponse) uint64 {
+	if response == nil || len(response.Results) == 0 {
+		return 0
+	}
+	var replicationIndex uint64
+	for _, result := range response.Results {
+		if result.Response == nil {
+			continue
+		}
+		if result.Response.Type == "execute" {
+			if res, err := result.Response.ExecuteResult(); err == nil && res.ReplicationIndex != nil {
+				if *res.ReplicationIndex > replicationIndex {
+					replicationIndex = *res.ReplicationIndex
+				}
+			}
+		} else if result.Response.Type == "batch" {
+			if res, err := result.Response.BatchResult(); err == nil && res.ReplicationIndex != nil {
+				if *res.ReplicationIndex > replicationIndex {
+					replicationIndex = *res.ReplicationIndex
+				}
+			}
+		}
+	}
+	return replicationIndex
+}
+
+func sendPipelineRequest(ctx context.Context, msg *hrana.PipelineRequest, url string, jwt string, host string) (result hrana.PipelineResponse, streamClosed bool, err error) {
+	reqBody, err := json.Marshal(msg)
+	if err != nil {
+		return hrana.PipelineResponse{}, false, err
+	}
+	ctx, cancel := context.WithTimeout(ctx, 60*time.Second)
+	defer cancel()
+	pipelineURL, err := net_url.JoinPath(url, "/v2/pipeline")
+	if err != nil {
+		return hrana.PipelineResponse{}, false, err
+	}
+	req, err := http.NewRequestWithContext(ctx, "POST", pipelineURL, bytes.NewReader(reqBody))
+	if err != nil {
+		return hrana.PipelineResponse{}, false, err
+	}
+	if len(jwt) > 0 {
+		req.Header.Set("Authorization", "Bearer "+jwt)
+	}
+	req.Header.Set("x-libsql-client-version", "libsql-remote-go-"+commitHash)
+	req.Host = host
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return hrana.PipelineResponse{}, false, err
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return hrana.PipelineResponse{}, false, err
+	}
+	if resp.StatusCode != http.StatusOK {
+		// We need to remember that the stream is closed so we don't try to send any more requests using this connection.
+		var serverError struct {
+			Error string `json:"error"`
+		}
+		if err := json.Unmarshal(body, &serverError); err == nil {
+			return hrana.PipelineResponse{}, true, fmt.Errorf("error code %d: %s", resp.StatusCode, serverError.Error)
+		}
+		var errResponse hrana.Error
+		if err := json.Unmarshal(body, &errResponse); err == nil {
+			if errResponse.Code != nil {
+				if *errResponse.Code == "STREAM_EXPIRED" {
+					return hrana.PipelineResponse{}, true, fmt.Errorf("error code %s: %s\n%w", *errResponse.Code, errResponse.Message, driver.ErrBadConn)
+				} else {
+					return hrana.PipelineResponse{}, true, fmt.Errorf("error code %s: %s", *errResponse.Code, errResponse.Message)
+				}
+			}
+			return hrana.PipelineResponse{}, true, errors.New(errResponse.Message)
+		}
+		return hrana.PipelineResponse{}, true, fmt.Errorf("error code %d: %s", resp.StatusCode, string(body))
+	}
+	if err = json.Unmarshal(body, &result); err != nil {
+		return hrana.PipelineResponse{}, false, err
+	}
+	return result, false, nil
+}
+
+func (h *hranaV2Conn) executeStmt(ctx context.Context, query string, args []driver.NamedValue, wantRows bool) (*hrana.PipelineResponse, error) {
+	stmts, params, err := shared.ParseStatementAndArgs(query, args)
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute SQL: %s\n%w", query, err)
+	}
+	msg := &hrana.PipelineRequest{}
+	if len(stmts) == 1 {
+		executeStream, err := hrana.ExecuteStream(stmts[0], params[0], wantRows)
+		if err != nil {
+			return nil, fmt.Errorf("failed to execute SQL: %s\n%w", query, err)
+		}
+		msg.Add(*executeStream)
+	} else {
+		batchStream, err := hrana.BatchStream(stmts, params, wantRows)
+		if err != nil {
+			return nil, fmt.Errorf("failed to execute SQL: %s\n%w", query, err)
+		}
+		msg.Add(*batchStream)
+	}
+
+	result, err := h.sendPipelineRequest(ctx, msg, false)
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute SQL: %s\n%w", query, err)
+	}
+
+	if result.Results[0].Error != nil {
+		return nil, fmt.Errorf("failed to execute SQL: %s\n%s", query, result.Results[0].Error.Message)
+	}
+	if result.Results[0].Response == nil {
+		return nil, fmt.Errorf("failed to execute SQL: %s\n%s", query, "no response received")
+	}
+	return result, nil
+}
+
+func (h *hranaV2Conn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
+	result, err := h.executeStmt(ctx, query, args, false)
+	if err != nil {
+		return nil, err
+	}
+	switch result.Results[0].Response.Type {
+	case "execute":
+		res, err := result.Results[0].Response.ExecuteResult()
+		if err != nil {
+			return nil, err
+		}
+		return shared.NewResult(res.GetLastInsertRowId(), int64(res.AffectedRowCount)), nil
+	case "batch":
+		res, err := result.Results[0].Response.BatchResult()
+		if err != nil {
+			return nil, err
+		}
+		lastInsertRowId := int64(0)
+		affectedRowCount := int64(0)
+		for _, r := range res.StepResults {
+			rowId := r.GetLastInsertRowId()
+			if rowId > 0 {
+				lastInsertRowId = rowId
+			}
+			affectedRowCount += int64(r.AffectedRowCount)
+		}
+		return shared.NewResult(lastInsertRowId, affectedRowCount), nil
+	default:
+		return nil, fmt.Errorf("failed to execute SQL: %s\n%s", query, "unknown response type")
+	}
+}
+
+type StmtResultRowsProvider struct {
+	r *hrana.StmtResult
+}
+
+func (p *StmtResultRowsProvider) SetsCount() int {
+	return 1
+}
+
+func (p *StmtResultRowsProvider) RowsCount(setIdx int) int {
+	if setIdx != 0 {
+		return 0
+	}
+	return len(p.r.Rows)
+}
+
+func (p *StmtResultRowsProvider) Columns(setIdx int) []string {
+	if setIdx != 0 {
+		return nil
+	}
+	res := make([]string, len(p.r.Cols))
+	for i, c := range p.r.Cols {
+		if c.Name != nil {
+			res[i] = *c.Name
+		}
+	}
+	return res
+}
+
+func (p *StmtResultRowsProvider) FieldValue(setIdx, rowIdx, colIdx int) driver.Value {
+	if setIdx != 0 {
+		return nil
+	}
+	return p.r.Rows[rowIdx][colIdx].ToValue(p.r.Cols[colIdx].Type)
+}
+
+func (p *StmtResultRowsProvider) Error(setIdx int) string {
+	return ""
+}
+
+func (p *StmtResultRowsProvider) HasResult(setIdx int) bool {
+	return setIdx == 0
+}
+
+type BatchResultRowsProvider struct {
+	r *hrana.BatchResult
+}
+
+func (p *BatchResultRowsProvider) SetsCount() int {
+	return len(p.r.StepResults)
+}
+
+func (p *BatchResultRowsProvider) RowsCount(setIdx int) int {
+	if setIdx >= len(p.r.StepResults) || p.r.StepResults[setIdx] == nil {
+		return 0
+	}
+	return len(p.r.StepResults[setIdx].Rows)
+}
+
+func (p *BatchResultRowsProvider) Columns(setIdx int) []string {
+	if setIdx >= len(p.r.StepResults) || p.r.StepResults[setIdx] == nil {
+		return nil
+	}
+	res := make([]string, len(p.r.StepResults[setIdx].Cols))
+	for i, c := range p.r.StepResults[setIdx].Cols {
+		if c.Name != nil {
+			res[i] = *c.Name
+		}
+	}
+	return res
+}
+
+func (p *BatchResultRowsProvider) FieldValue(setIdx, rowIdx, colIdx int) driver.Value {
+	if setIdx >= len(p.r.StepResults) || p.r.StepResults[setIdx] == nil {
+		return nil
+	}
+	return p.r.StepResults[setIdx].Rows[rowIdx][colIdx].ToValue(p.r.StepResults[setIdx].Cols[colIdx].Type)
+}
+
+func (p *BatchResultRowsProvider) Error(setIdx int) string {
+	if setIdx >= len(p.r.StepErrors) || p.r.StepErrors[setIdx] == nil {
+		return ""
+	}
+	return p.r.StepErrors[setIdx].Message
+}
+
+func (p *BatchResultRowsProvider) HasResult(setIdx int) bool {
+	return setIdx < len(p.r.StepResults) && p.r.StepResults[setIdx] != nil
+}
+
+func (h *hranaV2Conn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
+	result, err := h.executeStmt(ctx, query, args, true)
+	if err != nil {
+		return nil, err
+	}
+	switch result.Results[0].Response.Type {
+	case "execute":
+		res, err := result.Results[0].Response.ExecuteResult()
+		if err != nil {
+			return nil, err
+		}
+		return shared.NewRows(&StmtResultRowsProvider{res}), nil
+	case "batch":
+		res, err := result.Results[0].Response.BatchResult()
+		if err != nil {
+			return nil, err
+		}
+		return shared.NewRows(&BatchResultRowsProvider{res}), nil
+	default:
+		return nil, fmt.Errorf("failed to execute SQL: %s\n%s", query, "unknown response type")
+	}
+}
+
+func (h *hranaV2Conn) ResetSession(ctx context.Context) error {
+	if h.baton != "" {
+		go func(baton, url, jwt, host string) {
+			msg := hrana.PipelineRequest{Baton: baton}
+			msg.Add(hrana.CloseStream())
+			_, _, _ = sendPipelineRequest(context.Background(), &msg, url, jwt, host)
+		}(h.baton, h.url, h.jwt, h.host)
+		h.baton = ""
+	}
+	return nil
+}

vendor/github.com/tursodatabase/libsql-client-go/libsql/internal/http/shared/result.go

@@ -0,0 +1,18 @@
+package shared
+
+type result struct {
+	id      int64
+	changes int64
+}
+
+func NewResult(id, changes int64) *result {
+	return &result{id: id, changes: changes}
+}
+
+func (r *result) LastInsertId() (int64, error) {
+	return r.id, nil
+}
+
+func (r *result) RowsAffected() (int64, error) {
+	return r.changes, nil
+}

vendor/github.com/tursodatabase/libsql-client-go/libsql/internal/http/shared/rows.go

@@ -0,0 +1,69 @@
+package shared
+
+import (
+	"database/sql/driver"
+	"fmt"
+	"io"
+)
+
+type rowsProvider interface {
+	SetsCount() int
+	RowsCount(setIdx int) int
+	Columns(setIdx int) []string
+	FieldValue(setIdx, rowIdx int, columnIdx int) driver.Value
+	Error(setIdx int) string
+	HasResult(setIdx int) bool
+}
+
+func NewRows(result rowsProvider) driver.Rows {
+	return &rows{result: result}
+}
+
+type rows struct {
+	result                rowsProvider
+	currentResultSetIndex int
+	currentRowIdx         int
+}
+
+func (r *rows) Columns() []string {
+	return r.result.Columns(r.currentResultSetIndex)
+}
+
+func (r *rows) Close() error {
+	return nil
+}
+
+func (r *rows) Next(dest []driver.Value) error {
+	if r.currentRowIdx == r.result.RowsCount(r.currentResultSetIndex) {
+		return io.EOF
+	}
+	count := len(r.result.Columns(r.currentResultSetIndex))
+	for idx := 0; idx < count; idx++ {
+		dest[idx] = r.result.FieldValue(r.currentResultSetIndex, r.currentRowIdx, idx)
+	}
+	r.currentRowIdx++
+	return nil
+}
+
+func (r *rows) HasNextResultSet() bool {
+	return r.currentResultSetIndex < r.result.SetsCount()-1
+}
+
+func (r *rows) NextResultSet() error {
+	if !r.HasNextResultSet() {
+		return io.EOF
+	}
+
+	r.currentResultSetIndex++
+	r.currentRowIdx = 0
+
+	errStr := r.result.Error(r.currentResultSetIndex)
+	if errStr != "" {
+		return fmt.Errorf("failed to execute statement\n%s", errStr)
+	}
+	if !r.result.HasResult(r.currentResultSetIndex) {
+		return fmt.Errorf("no results for statement")
+	}
+
+	return nil
+}

vendor/github.com/tursodatabase/libsql-client-go/libsql/internal/http/shared/statement.go

@@ -0,0 +1,240 @@
+package shared
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"sort"
+
+	"github.com/antlr/antlr4/runtime/Go/antlr/v4"
+	"github.com/libsql/sqlite-antlr4-parser/sqliteparser"
+	"github.com/libsql/sqlite-antlr4-parser/sqliteparserutils"
+)
+
+type ParamsInfo struct {
+	NamedParameters           []string
+	PositionalParametersCount int
+}
+
+func ParseStatement(sql string) ([]string, []ParamsInfo, error) {
+	stmts, _ := sqliteparserutils.SplitStatement(sql)
+
+	stmtsParams := make([]ParamsInfo, len(stmts))
+	for idx, stmt := range stmts {
+		nameParams, positionalParamsCount, err := extractParameters(stmt)
+		if err != nil {
+			return nil, nil, err
+		}
+		stmtsParams[idx] = ParamsInfo{nameParams, positionalParamsCount}
+	}
+	return stmts, stmtsParams, nil
+}
+
+func ParseStatementAndArgs(sql string, args []driver.NamedValue) ([]string, []Params, error) {
+	parameters, err := ConvertArgs(args)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	stmts, _ := sqliteparserutils.SplitStatement(sql)
+
+	stmtsParams := make([]Params, len(stmts))
+	totalParametersAlreadyUsed := 0
+	for idx, stmt := range stmts {
+		stmtParams, err := generateStatementParameters(stmt, parameters, totalParametersAlreadyUsed)
+		if err != nil {
+			return nil, nil, fmt.Errorf("fail to generate statement parameter. statement: %s. error: %v", stmt, err)
+		}
+		stmtsParams[idx] = stmtParams
+		totalParametersAlreadyUsed += stmtParams.Len()
+	}
+	return stmts, stmtsParams, nil
+}
+
+type paramsType int
+
+const (
+	namedParameters paramsType = iota
+	positionalParameters
+)
+
+type Params struct {
+	positional []any
+	named      map[string]any
+}
+
+func (p *Params) MarshalJSON() ([]byte, error) {
+	if len(p.named) > 0 {
+		return json.Marshal(p.named)
+	}
+	if len(p.positional) > 0 {
+		return json.Marshal(p.positional)
+	}
+	return json.Marshal(make([]any, 0))
+}
+
+func (p *Params) Named() map[string]any {
+	return p.named
+}
+
+func (p *Params) Positional() []any {
+	return p.positional
+}
+
+func (p *Params) Len() int {
+	if p.named != nil {
+		return len(p.named)
+	}
+
+	return len(p.positional)
+}
+
+func (p *Params) Type() paramsType {
+	if p.named != nil {
+		return namedParameters
+	}
+
+	return positionalParameters
+}
+
+func NewParams(t paramsType) Params {
+	p := Params{}
+	switch t {
+	case namedParameters:
+		p.named = make(map[string]any)
+	case positionalParameters:
+		p.positional = make([]any, 0)
+	}
+
+	return p
+}
+
+func getParamType(arg *driver.NamedValue) paramsType {
+	if arg.Name == "" {
+		return positionalParameters
+	}
+	return namedParameters
+}
+
+func ConvertArgs(args []driver.NamedValue) (Params, error) {
+	if len(args) == 0 {
+		return NewParams(positionalParameters), nil
+	}
+
+	var sortedArgs []*driver.NamedValue
+	for idx := range args {
+		sortedArgs = append(sortedArgs, &args[idx])
+	}
+	sort.Slice(sortedArgs, func(i, j int) bool {
+		return sortedArgs[i].Ordinal < sortedArgs[j].Ordinal
+	})
+
+	parametersType := getParamType(sortedArgs[0])
+	parameters := NewParams(parametersType)
+	for _, arg := range sortedArgs {
+		if parametersType != getParamType(arg) {
+			return Params{}, fmt.Errorf("driver does not accept positional and named parameters at the same time")
+		}
+
+		switch parametersType {
+		case positionalParameters:
+			parameters.positional = append(parameters.positional, arg.Value)
+		case namedParameters:
+			parameters.named[arg.Name] = arg.Value
+		}
+	}
+	return parameters, nil
+}
+
+func generateStatementParameters(stmt string, queryParams Params, positionalParametersOffset int) (Params, error) {
+	nameParams, positionalParamsCount, err := extractParameters(stmt)
+	if err != nil {
+		return Params{}, err
+	}
+
+	stmtParams := NewParams(queryParams.Type())
+
+	switch queryParams.Type() {
+	case positionalParameters:
+		if positionalParametersOffset+positionalParamsCount > len(queryParams.positional) {
+			return Params{}, fmt.Errorf("missing positional parameters")
+		}
+		stmtParams.positional = queryParams.positional[positionalParametersOffset : positionalParametersOffset+positionalParamsCount]
+	case namedParameters:
+		stmtParametersNeeded := make(map[string]bool)
+		for _, stmtParametersName := range nameParams {
+			stmtParametersNeeded[stmtParametersName] = true
+		}
+		for queryParamsName, queryParamsValue := range queryParams.named {
+			if stmtParametersNeeded[queryParamsName] {
+				stmtParams.named[queryParamsName] = queryParamsValue
+				delete(stmtParametersNeeded, queryParamsName)
+			}
+		}
+	}
+
+	return stmtParams, nil
+}
+
+func extractParameters(stmt string) (nameParams []string, positionalParamsCount int, err error) {
+	statementStream := antlr.NewInputStream(stmt)
+	sqliteparser.NewSQLiteLexer(statementStream)
+	lexer := sqliteparser.NewSQLiteLexer(statementStream)
+
+	allTokens := lexer.GetAllTokens()
+
+	nameParamsSet := make(map[string]bool)
+
+	for _, token := range allTokens {
+		tokenType := token.GetTokenType()
+		if tokenType == sqliteparser.SQLiteLexerBIND_PARAMETER {
+			parameter := token.GetText()
+
+			isPositionalParameter, err := isPositionalParameter(parameter)
+			if err != nil {
+				return []string{}, 0, err
+			}
+
+			if isPositionalParameter {
+				positionalParamsCount++
+			} else {
+				paramWithoutPrefix, err := removeParamPrefix(parameter)
+				if err != nil {
+					return []string{}, 0, err
+				} else {
+					nameParamsSet[paramWithoutPrefix] = true
+				}
+			}
+		}
+	}
+
+	nameParams = make([]string, 0, len(nameParamsSet))
+	for k := range nameParamsSet {
+		nameParams = append(nameParams, k)
+	}
+
+	return nameParams, positionalParamsCount, nil
+}
+
+func isPositionalParameter(param string) (ok bool, err error) {
+	re := regexp.MustCompile(`\?([0-9]*).*`)
+	match := re.FindSubmatch([]byte(param))
+	if match == nil {
+		return false, nil
+	}
+
+	posS := string(match[1])
+	if posS == "" {
+		return true, nil
+	}
+
+	return true, fmt.Errorf("unsuppoted positional parameter. This driver does not accept positional parameters with indexes (like ?<number>)")
+}
+
+func removeParamPrefix(paramName string) (string, error) {
+	if paramName[0] == ':' || paramName[0] == '@' || paramName[0] == '$' {
+		return paramName[1:], nil
+	}
+	return "", fmt.Errorf("all named parameters must start with ':', or '@' or '$'")
+}