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sqlite_server.go
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sqlite_server.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build go1.18
// +build go1.18
// Package example contains a FlightSQL Server implementation using
// sqlite as the backing engine.
//
// In order to ensure portability we'll use modernc.org/sqlite instead
// of github.com/mattn/go-sqlite3 because modernc is a translation of the
// SQLite source into Go, such that it doesn't require CGO to run and
// doesn't need to link against the actual libsqlite3 libraries. This way
// we don't require CGO or libsqlite3 to run this example or the tests.
//
// That said, since both implement in terms of Go's standard database/sql
// package, it's easy to swap them out if desired as the modernc.org/sqlite
// package is slower than go-sqlite3.
//
// One other important note is that modernc.org/sqlite only works
// correctly (specifically pragma_table_info) in go 1.18+ so this
// entire package is given the build constraint to only build when
// using go1.18 or higher
package example
import (
"bytes"
"context"
"database/sql"
"fmt"
"math/rand"
"strings"
"sync"
"github.com/apache/arrow/go/v18/arrow"
"github.com/apache/arrow/go/v18/arrow/array"
"github.com/apache/arrow/go/v18/arrow/flight"
"github.com/apache/arrow/go/v18/arrow/flight/flightsql"
"github.com/apache/arrow/go/v18/arrow/flight/flightsql/schema_ref"
"github.com/apache/arrow/go/v18/arrow/memory"
"github.com/apache/arrow/go/v18/arrow/scalar"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
_ "modernc.org/sqlite"
)
func genRandomString() []byte {
const length = 16
max := int('z')
// don't include ':' as a valid byte to generate
// because we use it as a separator for the transactions
min := int('<')
out := make([]byte, length)
for i := range out {
out[i] = byte(rand.Intn(max-min+1) + min)
}
return out
}
func prepareQueryForGetTables(cmd flightsql.GetTables) string {
var b strings.Builder
b.WriteString(`SELECT 'main' AS catalog_name, '' AS schema_name,
name AS table_name, type AS table_type FROM sqlite_master WHERE 1=1`)
if cmd.GetCatalog() != nil {
b.WriteString(" and catalog_name = '")
b.WriteString(*cmd.GetCatalog())
b.WriteByte('\'')
}
if cmd.GetDBSchemaFilterPattern() != nil {
b.WriteString(" and schema_name LIKE '")
b.WriteString(*cmd.GetDBSchemaFilterPattern())
b.WriteByte('\'')
}
if cmd.GetTableNameFilterPattern() != nil {
b.WriteString(" and table_name LIKE '")
b.WriteString(*cmd.GetTableNameFilterPattern())
b.WriteByte('\'')
}
if len(cmd.GetTableTypes()) > 0 {
b.WriteString(" and table_type IN (")
for i, t := range cmd.GetTableTypes() {
if i != 0 {
b.WriteByte(',')
}
fmt.Fprintf(&b, "'%s'", t)
}
b.WriteByte(')')
}
b.WriteString(" order by table_name")
return b.String()
}
func prepareQueryForGetKeys(filter string) string {
return `SELECT * FROM (
SELECT
NULL AS pk_catalog_name,
NULL AS pk_schema_name,
p."table" AS pk_table_name,
p."to" AS pk_column_name,
NULL AS fk_catalog_name,
NULL AS fk_schema_name,
m.name AS fk_table_name,
p."from" AS fk_column_name,
p.seq AS key_sequence,
NULL AS pk_key_name,
NULL AS fk_key_name,
CASE
WHEN p.on_update = 'CASCADE' THEN 0
WHEN p.on_update = 'RESTRICT' THEN 1
WHEN p.on_update = 'SET NULL' THEN 2
WHEN p.on_update = 'NO ACTION' THEN 3
WHEN p.on_update = 'SET DEFAULT' THEN 4
END AS update_rule,
CASE
WHEN p.on_delete = 'CASCADE' THEN 0
WHEN p.on_delete = 'RESTRICT' THEN 1
WHEN p.on_delete = 'SET NULL' THEN 2
WHEN p.on_delete = 'NO ACTION' THEN 3
WHEN p.on_delete = 'SET DEFAULT' THEN 4
END AS delete_rule
FROM sqlite_master m
JOIN pragma_foreign_key_list(m.name) p ON m.name != p."table"
WHERE m.type = 'table') WHERE ` + filter +
` ORDER BY pk_catalog_name, pk_schema_name, pk_table_name, pk_key_name, key_sequence`
}
func CreateDB() (*sql.DB, error) {
db, err := sql.Open("sqlite", "file::memory:?cache=shared")
if err != nil {
return nil, err
}
_, err = db.Exec(`
CREATE TABLE foreignTable (
id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
foreignName varchar(100),
value int);
CREATE TABLE intTable (
id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
keyName varchar(100),
value int,
foreignId int references foreignTable(id));
INSERT INTO foreignTable (foreignName, value) VALUES ('keyOne', 1);
INSERT INTO foreignTable (foreignName, value) VALUES ('keyTwo', 0);
INSERT INTO foreignTable (foreignName, value) VALUES ('keyThree', -1);
INSERT INTO intTable (keyName, value, foreignId) VALUES ('one', 1, 1);
INSERT INTO intTable (keyName, value, foreignId) VALUES ('zero', 0, 1);
INSERT INTO intTable (keyName, value, foreignId) VALUES ('negative one', -1, 1);
INSERT INTO intTable (keyName, value, foreignId) VALUES (NULL, NULL, NULL);
`)
if err != nil {
db.Close()
return nil, err
}
return db, nil
}
func encodeTransactionQuery(query string, transactionID flightsql.Transaction) ([]byte, error) {
return flightsql.CreateStatementQueryTicket(
bytes.Join([][]byte{transactionID, []byte(query)}, []byte(":")))
}
func decodeTransactionQuery(ticket []byte) (txnID, query string, err error) {
id, queryBytes, found := bytes.Cut(ticket, []byte(":"))
if !found {
err = fmt.Errorf("%w: malformed ticket", arrow.ErrInvalid)
return
}
txnID = string(id)
query = string(queryBytes)
return
}
type Statement struct {
stmt *sql.Stmt
params [][]interface{}
}
type SQLiteFlightSQLServer struct {
flightsql.BaseServer
db *sql.DB
prepared sync.Map
openTransactions sync.Map
}
func NewSQLiteFlightSQLServer(db *sql.DB) (*SQLiteFlightSQLServer, error) {
ret := &SQLiteFlightSQLServer{db: db}
ret.Alloc = memory.DefaultAllocator
for k, v := range SqlInfoResultMap() {
ret.RegisterSqlInfo(flightsql.SqlInfo(k), v)
}
return ret, nil
}
func (s *SQLiteFlightSQLServer) flightInfoForCommand(desc *flight.FlightDescriptor, schema *arrow.Schema) *flight.FlightInfo {
return &flight.FlightInfo{
Endpoint: []*flight.FlightEndpoint{{Ticket: &flight.Ticket{Ticket: desc.Cmd}}},
FlightDescriptor: desc,
Schema: flight.SerializeSchema(schema, s.Alloc),
TotalRecords: -1,
TotalBytes: -1,
}
}
func (s *SQLiteFlightSQLServer) GetFlightInfoStatement(ctx context.Context, cmd flightsql.StatementQuery, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
query, txnid := cmd.GetQuery(), cmd.GetTransactionId()
tkt, err := encodeTransactionQuery(query, txnid)
if err != nil {
return nil, err
}
return &flight.FlightInfo{
Endpoint: []*flight.FlightEndpoint{{Ticket: &flight.Ticket{Ticket: tkt}}},
FlightDescriptor: desc,
TotalRecords: -1,
TotalBytes: -1,
}, nil
}
func (s *SQLiteFlightSQLServer) DoGetStatement(ctx context.Context, cmd flightsql.StatementQueryTicket) (*arrow.Schema, <-chan flight.StreamChunk, error) {
txnid, query, err := decodeTransactionQuery(cmd.GetStatementHandle())
if err != nil {
return nil, nil, err
}
var db dbQueryCtx = s.db
if txnid != "" {
tx, loaded := s.openTransactions.Load(txnid)
if !loaded {
return nil, nil, fmt.Errorf("%w: invalid transaction id specified: %s", arrow.ErrInvalid, txnid)
}
db = tx.(*sql.Tx)
}
return doGetQuery(ctx, s.Alloc, db, query, nil)
}
func (s *SQLiteFlightSQLServer) GetFlightInfoCatalogs(_ context.Context, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
return s.flightInfoForCommand(desc, schema_ref.Catalogs), nil
}
func (s *SQLiteFlightSQLServer) DoGetCatalogs(context.Context) (*arrow.Schema, <-chan flight.StreamChunk, error) {
// https://www.sqlite.org/cli.html
// > The ".databases" command shows a list of all databases open
// > in the current connection. There will always be at least
// > 2. The first one is "main", the original database opened. The
// > second is "temp", the database used for temporary tables.
// For our purposes, return only "main" and ignore other databases.
schema := schema_ref.Catalogs
catalogs, _, err := array.FromJSON(s.Alloc, arrow.BinaryTypes.String, strings.NewReader(`["main"]`))
if err != nil {
return nil, nil, err
}
defer catalogs.Release()
batch := array.NewRecord(schema, []arrow.Array{catalogs}, 1)
ch := make(chan flight.StreamChunk, 1)
ch <- flight.StreamChunk{Data: batch}
close(ch)
return schema, ch, nil
}
func (s *SQLiteFlightSQLServer) GetFlightInfoSchemas(_ context.Context, cmd flightsql.GetDBSchemas, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
return s.flightInfoForCommand(desc, schema_ref.DBSchemas), nil
}
func (s *SQLiteFlightSQLServer) DoGetDBSchemas(_ context.Context, cmd flightsql.GetDBSchemas) (*arrow.Schema, <-chan flight.StreamChunk, error) {
// SQLite doesn't support schemas, so pretend we have a single unnamed schema.
schema := schema_ref.DBSchemas
ch := make(chan flight.StreamChunk, 1)
if cmd.GetDBSchemaFilterPattern() == nil || *cmd.GetDBSchemaFilterPattern() == "" {
catalogs, _, err := array.FromJSON(s.Alloc, arrow.BinaryTypes.String, strings.NewReader(`["main"]`))
if err != nil {
return nil, nil, err
}
defer catalogs.Release()
dbSchemas, _, err := array.FromJSON(s.Alloc, arrow.BinaryTypes.String, strings.NewReader(`[""]`))
if err != nil {
return nil, nil, err
}
defer dbSchemas.Release()
batch := array.NewRecord(schema, []arrow.Array{catalogs, dbSchemas}, 1)
ch <- flight.StreamChunk{Data: batch}
}
close(ch)
return schema, ch, nil
}
func (s *SQLiteFlightSQLServer) GetFlightInfoTables(_ context.Context, cmd flightsql.GetTables, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
schema := schema_ref.Tables
if cmd.GetIncludeSchema() {
schema = schema_ref.TablesWithIncludedSchema
}
return s.flightInfoForCommand(desc, schema), nil
}
func (s *SQLiteFlightSQLServer) DoGetTables(ctx context.Context, cmd flightsql.GetTables) (*arrow.Schema, <-chan flight.StreamChunk, error) {
query := prepareQueryForGetTables(cmd)
rows, err := s.db.QueryContext(ctx, query)
if err != nil {
return nil, nil, err
}
var rdr array.RecordReader
rdr, err = NewSqlBatchReaderWithSchema(s.Alloc, schema_ref.Tables, rows)
if err != nil {
return nil, nil, err
}
ch := make(chan flight.StreamChunk, 2)
if cmd.GetIncludeSchema() {
rdr, err = NewSqliteTablesSchemaBatchReader(ctx, s.Alloc, rdr, s.db, query)
if err != nil {
return nil, nil, err
}
}
schema := rdr.Schema()
go flight.StreamChunksFromReader(rdr, ch)
return schema, ch, nil
}
func (s *SQLiteFlightSQLServer) GetFlightInfoXdbcTypeInfo(_ context.Context, _ flightsql.GetXdbcTypeInfo, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
return s.flightInfoForCommand(desc, schema_ref.XdbcTypeInfo), nil
}
func (s *SQLiteFlightSQLServer) DoGetXdbcTypeInfo(_ context.Context, cmd flightsql.GetXdbcTypeInfo) (*arrow.Schema, <-chan flight.StreamChunk, error) {
var batch arrow.Record
if cmd.GetDataType() == nil {
batch = GetTypeInfoResult(s.Alloc)
} else {
batch = GetFilteredTypeInfoResult(s.Alloc, *cmd.GetDataType())
}
ch := make(chan flight.StreamChunk, 1)
ch <- flight.StreamChunk{Data: batch}
close(ch)
return batch.Schema(), ch, nil
}
func (s *SQLiteFlightSQLServer) GetFlightInfoTableTypes(_ context.Context, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
return s.flightInfoForCommand(desc, schema_ref.TableTypes), nil
}
func (s *SQLiteFlightSQLServer) DoGetTableTypes(ctx context.Context) (*arrow.Schema, <-chan flight.StreamChunk, error) {
query := "SELECT DISTINCT type AS table_type FROM sqlite_master"
return doGetQuery(ctx, s.Alloc, s.db, query, schema_ref.TableTypes)
}
func (s *SQLiteFlightSQLServer) DoPutCommandStatementUpdate(ctx context.Context, cmd flightsql.StatementUpdate) (int64, error) {
var (
res sql.Result
err error
)
if len(cmd.GetTransactionId()) > 0 {
tx, loaded := s.openTransactions.Load(string(cmd.GetTransactionId()))
if !loaded {
return -1, status.Error(codes.InvalidArgument, "invalid transaction handle provided")
}
res, err = tx.(*sql.Tx).ExecContext(ctx, cmd.GetQuery())
} else {
res, err = s.db.ExecContext(ctx, cmd.GetQuery())
}
if err != nil {
return 0, err
}
return res.RowsAffected()
}
func (s *SQLiteFlightSQLServer) CreatePreparedStatement(ctx context.Context, req flightsql.ActionCreatePreparedStatementRequest) (result flightsql.ActionCreatePreparedStatementResult, err error) {
var stmt *sql.Stmt
if len(req.GetTransactionId()) > 0 {
tx, loaded := s.openTransactions.Load(string(req.GetTransactionId()))
if !loaded {
return result, status.Error(codes.InvalidArgument, "invalid transaction handle provided")
}
stmt, err = tx.(*sql.Tx).PrepareContext(ctx, req.GetQuery())
} else {
stmt, err = s.db.PrepareContext(ctx, req.GetQuery())
}
if err != nil {
return result, err
}
handle := genRandomString()
s.prepared.Store(string(handle), Statement{stmt: stmt})
result.Handle = handle
// no way to get the dataset or parameter schemas from sql.DB
return
}
func (s *SQLiteFlightSQLServer) ClosePreparedStatement(ctx context.Context, request flightsql.ActionClosePreparedStatementRequest) error {
handle := request.GetPreparedStatementHandle()
if val, loaded := s.prepared.LoadAndDelete(string(handle)); loaded {
stmt := val.(Statement)
return stmt.stmt.Close()
}
return status.Error(codes.InvalidArgument, "prepared statement not found")
}
func (s *SQLiteFlightSQLServer) GetFlightInfoPreparedStatement(_ context.Context, cmd flightsql.PreparedStatementQuery, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
_, ok := s.prepared.Load(string(cmd.GetPreparedStatementHandle()))
if !ok {
return nil, status.Error(codes.InvalidArgument, "prepared statement not found")
}
return &flight.FlightInfo{
Endpoint: []*flight.FlightEndpoint{{Ticket: &flight.Ticket{Ticket: desc.Cmd}}},
FlightDescriptor: desc,
TotalRecords: -1,
TotalBytes: -1,
}, nil
}
type dbQueryCtx interface {
QueryContext(context.Context, string, ...any) (*sql.Rows, error)
}
func doGetQuery(ctx context.Context, mem memory.Allocator, db dbQueryCtx, query string, schema *arrow.Schema, args ...interface{}) (*arrow.Schema, <-chan flight.StreamChunk, error) {
rows, err := db.QueryContext(ctx, query, args...)
if err != nil {
// Not really useful except for testing Flight SQL clients
trailers := metadata.Pairs("afsql-sqlite-query", query)
grpc.SetTrailer(ctx, trailers)
return nil, nil, err
}
var rdr *SqlBatchReader
if schema != nil {
rdr, err = NewSqlBatchReaderWithSchema(mem, schema, rows)
} else {
rdr, err = NewSqlBatchReader(mem, rows)
if err == nil {
schema = rdr.schema
}
}
if err != nil {
return nil, nil, err
}
ch := make(chan flight.StreamChunk)
go flight.StreamChunksFromReader(rdr, ch)
return schema, ch, nil
}
func (s *SQLiteFlightSQLServer) DoGetPreparedStatement(ctx context.Context, cmd flightsql.PreparedStatementQuery) (schema *arrow.Schema, out <-chan flight.StreamChunk, err error) {
val, ok := s.prepared.Load(string(cmd.GetPreparedStatementHandle()))
if !ok {
return nil, nil, status.Error(codes.InvalidArgument, "prepared statement not found")
}
stmt := val.(Statement)
readers := make([]array.RecordReader, 0, len(stmt.params))
if len(stmt.params) == 0 {
rows, err := stmt.stmt.QueryContext(ctx)
if err != nil {
return nil, nil, err
}
rdr, err := NewSqlBatchReader(s.Alloc, rows)
if err != nil {
return nil, nil, err
}
schema = rdr.schema
readers = append(readers, rdr)
} else {
defer func() {
if err != nil {
for _, r := range readers {
r.Release()
}
}
}()
var (
rows *sql.Rows
rdr *SqlBatchReader
)
// if we have multiple rows of bound params, execute the query
// multiple times and concatenate the result sets.
for _, p := range stmt.params {
rows, err = stmt.stmt.QueryContext(ctx, p...)
if err != nil {
return nil, nil, err
}
if schema == nil {
rdr, err = NewSqlBatchReader(s.Alloc, rows)
if err != nil {
return nil, nil, err
}
schema = rdr.schema
} else {
rdr, err = NewSqlBatchReaderWithSchema(s.Alloc, schema, rows)
if err != nil {
return nil, nil, err
}
}
readers = append(readers, rdr)
}
}
ch := make(chan flight.StreamChunk)
go flight.ConcatenateReaders(readers, ch)
out = ch
return
}
func scalarToIFace(s scalar.Scalar) (interface{}, error) {
if !s.IsValid() {
return nil, nil
}
switch val := s.(type) {
case *scalar.Int8:
return val.Value, nil
case *scalar.Uint8:
return val.Value, nil
case *scalar.Int32:
return val.Value, nil
case *scalar.Int64:
return val.Value, nil
case *scalar.Float32:
return val.Value, nil
case *scalar.Float64:
return val.Value, nil
case *scalar.String:
return string(val.Value.Bytes()), nil
case *scalar.Binary:
return val.Value.Bytes(), nil
case scalar.DateScalar:
return val.ToTime(), nil
case scalar.TimeScalar:
return val.ToTime(), nil
case *scalar.DenseUnion:
return scalarToIFace(val.Value)
default:
return nil, fmt.Errorf("unsupported type: %s", val)
}
}
func getParamsForStatement(rdr flight.MessageReader) (params [][]interface{}, err error) {
params = make([][]interface{}, 0)
for rdr.Next() {
rec := rdr.Record()
nrows := int(rec.NumRows())
ncols := int(rec.NumCols())
for i := 0; i < nrows; i++ {
invokeParams := make([]interface{}, ncols)
for c := 0; c < ncols; c++ {
col := rec.Column(c)
sc, err := scalar.GetScalar(col, i)
if err != nil {
return nil, err
}
if r, ok := sc.(scalar.Releasable); ok {
r.Release()
}
invokeParams[c], err = scalarToIFace(sc)
if err != nil {
return nil, err
}
}
params = append(params, invokeParams)
}
}
return params, rdr.Err()
}
func (s *SQLiteFlightSQLServer) DoPutPreparedStatementQuery(_ context.Context, cmd flightsql.PreparedStatementQuery, rdr flight.MessageReader, _ flight.MetadataWriter) ([]byte, error) {
val, ok := s.prepared.Load(string(cmd.GetPreparedStatementHandle()))
if !ok {
return nil, status.Error(codes.InvalidArgument, "prepared statement not found")
}
stmt := val.(Statement)
args, err := getParamsForStatement(rdr)
if err != nil {
return nil, status.Errorf(codes.Internal, "error gathering parameters for prepared statement query: %s", err.Error())
}
stmt.params = args
s.prepared.Store(string(cmd.GetPreparedStatementHandle()), stmt)
return cmd.GetPreparedStatementHandle(), nil
}
func (s *SQLiteFlightSQLServer) DoPutPreparedStatementUpdate(ctx context.Context, cmd flightsql.PreparedStatementUpdate, rdr flight.MessageReader) (int64, error) {
val, ok := s.prepared.Load(string(cmd.GetPreparedStatementHandle()))
if !ok {
return 0, status.Error(codes.InvalidArgument, "prepared statement not found")
}
stmt := val.(Statement)
args, err := getParamsForStatement(rdr)
if err != nil {
return 0, status.Errorf(codes.Internal, "error gathering parameters for prepared statement: %s", err.Error())
}
if len(args) == 0 {
result, err := stmt.stmt.ExecContext(ctx)
if err != nil {
if strings.Contains(err.Error(), "no such table") {
return 0, status.Error(codes.NotFound, err.Error())
}
return 0, err
}
return result.RowsAffected()
}
var totalAffected int64
for _, p := range args {
result, err := stmt.stmt.ExecContext(ctx, p...)
if err != nil {
if strings.Contains(err.Error(), "no such table") {
return totalAffected, status.Error(codes.NotFound, err.Error())
}
return totalAffected, err
}
n, err := result.RowsAffected()
if err != nil {
return totalAffected, err
}
totalAffected += n
}
return totalAffected, nil
}
func (s *SQLiteFlightSQLServer) GetFlightInfoPrimaryKeys(_ context.Context, cmd flightsql.TableRef, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
return s.flightInfoForCommand(desc, schema_ref.PrimaryKeys), nil
}
func (s *SQLiteFlightSQLServer) DoGetPrimaryKeys(ctx context.Context, cmd flightsql.TableRef) (*arrow.Schema, <-chan flight.StreamChunk, error) {
// the field key_name cannot be recovered by sqlite so it is
// being set to null following the same pattern for catalog name and schema_name
var b strings.Builder
b.WriteString(`
SELECT null AS catalog_name, null AS schema_name, table_name, name AS column_name, pk AS key_sequence, null as key_name
FROM pragma_table_info(table_name)
JOIN (SELECT null AS catalog_name, null AS schema_name, name AS table_name, type AS table_type
FROM sqlite_master) where 1=1 AND pk !=0`)
if cmd.Catalog != nil {
fmt.Fprintf(&b, " and catalog_name LIKE '%s'", *cmd.Catalog)
}
if cmd.DBSchema != nil {
fmt.Fprintf(&b, " and schema_name LIKE '%s'", *cmd.DBSchema)
}
fmt.Fprintf(&b, " and table_name LIKE '%s'", cmd.Table)
return doGetQuery(ctx, s.Alloc, s.db, b.String(), schema_ref.PrimaryKeys)
}
func (s *SQLiteFlightSQLServer) GetFlightInfoImportedKeys(_ context.Context, _ flightsql.TableRef, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
return s.flightInfoForCommand(desc, schema_ref.ImportedKeys), nil
}
func (s *SQLiteFlightSQLServer) DoGetImportedKeys(ctx context.Context, ref flightsql.TableRef) (*arrow.Schema, <-chan flight.StreamChunk, error) {
filter := "fk_table_name = '" + ref.Table + "'"
if ref.Catalog != nil {
filter += " AND fk_catalog_name = '" + *ref.Catalog + "'"
}
if ref.DBSchema != nil {
filter += " AND fk_schema_name = '" + *ref.DBSchema + "'"
}
query := prepareQueryForGetKeys(filter)
return doGetQuery(ctx, s.Alloc, s.db, query, schema_ref.ImportedKeys)
}
func (s *SQLiteFlightSQLServer) GetFlightInfoExportedKeys(_ context.Context, _ flightsql.TableRef, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
return s.flightInfoForCommand(desc, schema_ref.ExportedKeys), nil
}
func (s *SQLiteFlightSQLServer) DoGetExportedKeys(ctx context.Context, ref flightsql.TableRef) (*arrow.Schema, <-chan flight.StreamChunk, error) {
filter := "pk_table_name = '" + ref.Table + "'"
if ref.Catalog != nil {
filter += " AND pk_catalog_name = '" + *ref.Catalog + "'"
}
if ref.DBSchema != nil {
filter += " AND pk_schema_name = '" + *ref.DBSchema + "'"
}
query := prepareQueryForGetKeys(filter)
return doGetQuery(ctx, s.Alloc, s.db, query, schema_ref.ExportedKeys)
}
func (s *SQLiteFlightSQLServer) GetFlightInfoCrossReference(_ context.Context, _ flightsql.CrossTableRef, desc *flight.FlightDescriptor) (*flight.FlightInfo, error) {
return s.flightInfoForCommand(desc, schema_ref.CrossReference), nil
}
func (s *SQLiteFlightSQLServer) DoGetCrossReference(ctx context.Context, cmd flightsql.CrossTableRef) (*arrow.Schema, <-chan flight.StreamChunk, error) {
pkref := cmd.PKRef
filter := "pk_table_name = '" + pkref.Table + "'"
if pkref.Catalog != nil {
filter += " AND pk_catalog_name = '" + *pkref.Catalog + "'"
}
if pkref.DBSchema != nil {
filter += " AND pk_schema_name = '" + *pkref.DBSchema + "'"
}
fkref := cmd.FKRef
filter += " AND fk_table_name = '" + fkref.Table + "'"
if fkref.Catalog != nil {
filter += " AND fk_catalog_name = '" + *fkref.Catalog + "'"
}
if fkref.DBSchema != nil {
filter += " AND fk_schema_name = '" + *fkref.DBSchema + "'"
}
query := prepareQueryForGetKeys(filter)
return doGetQuery(ctx, s.Alloc, s.db, query, schema_ref.ExportedKeys)
}
func (s *SQLiteFlightSQLServer) BeginTransaction(_ context.Context, req flightsql.ActionBeginTransactionRequest) (id []byte, err error) {
tx, err := s.db.Begin()
if err != nil {
return nil, status.Errorf(codes.Internal, "failed to begin transaction: %s", err.Error())
}
handle := genRandomString()
s.openTransactions.Store(string(handle), tx)
return handle, nil
}
func (s *SQLiteFlightSQLServer) EndTransaction(_ context.Context, req flightsql.ActionEndTransactionRequest) error {
if req.GetAction() == flightsql.EndTransactionUnspecified {
return status.Error(codes.InvalidArgument, "must specify Commit or Rollback to end transaction")
}
handle := string(req.GetTransactionId())
if tx, loaded := s.openTransactions.LoadAndDelete(handle); loaded {
txn := tx.(*sql.Tx)
switch req.GetAction() {
case flightsql.EndTransactionCommit:
if err := txn.Commit(); err != nil {
return status.Error(codes.Internal, "failed to commit transaction: "+err.Error())
}
case flightsql.EndTransactionRollback:
if err := txn.Rollback(); err != nil {
return status.Error(codes.Internal, "failed to rollback transaction: "+err.Error())
}
}
return nil
}
return status.Error(codes.InvalidArgument, "transaction id not found")
}