GoToSocial/vendor/modernc.org/sqlite/sqlite.go

1355 lines
35 KiB
Go

// Copyright 2017 The Sqlite Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:generate go run generator.go
//go:generate go fmt ./...
package sqlite // import "modernc.org/sqlite"
import (
"context"
"database/sql"
"database/sql/driver"
"fmt"
"io"
"math"
"net/url"
"reflect"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"unsafe"
"modernc.org/libc"
"modernc.org/libc/sys/types"
sqlite3 "modernc.org/sqlite/lib"
)
var (
_ driver.Conn = (*conn)(nil)
_ driver.Driver = (*Driver)(nil)
//lint:ignore SA1019 TODO implement ExecerContext
_ driver.Execer = (*conn)(nil)
//lint:ignore SA1019 TODO implement QueryerContext
_ driver.Queryer = (*conn)(nil)
_ driver.Result = (*result)(nil)
_ driver.Rows = (*rows)(nil)
_ driver.RowsColumnTypeDatabaseTypeName = (*rows)(nil)
_ driver.RowsColumnTypeLength = (*rows)(nil)
_ driver.RowsColumnTypeNullable = (*rows)(nil)
_ driver.RowsColumnTypePrecisionScale = (*rows)(nil)
_ driver.RowsColumnTypeScanType = (*rows)(nil)
_ driver.Stmt = (*stmt)(nil)
_ driver.Tx = (*tx)(nil)
_ error = (*Error)(nil)
)
const (
driverName = "sqlite"
ptrSize = unsafe.Sizeof(uintptr(0))
sqliteLockedSharedcache = sqlite3.SQLITE_LOCKED | (1 << 8)
)
// Error represents sqlite library error code.
type Error struct {
msg string
code int
}
// Error implements error.
func (e *Error) Error() string { return e.msg }
// Code returns the sqlite result code for this error.
func (e *Error) Code() int { return e.code }
var (
// ErrorCodeString maps Error.Code() to its string representation.
ErrorCodeString = map[int]string{
sqlite3.SQLITE_ABORT: "Callback routine requested an abort (SQLITE_ABORT)",
sqlite3.SQLITE_AUTH: "Authorization denied (SQLITE_AUTH)",
sqlite3.SQLITE_BUSY: "The database file is locked (SQLITE_BUSY)",
sqlite3.SQLITE_CANTOPEN: "Unable to open the database file (SQLITE_CANTOPEN)",
sqlite3.SQLITE_CONSTRAINT: "Abort due to constraint violation (SQLITE_CONSTRAINT)",
sqlite3.SQLITE_CORRUPT: "The database disk image is malformed (SQLITE_CORRUPT)",
sqlite3.SQLITE_DONE: "sqlite3_step() has finished executing (SQLITE_DONE)",
sqlite3.SQLITE_EMPTY: "Internal use only (SQLITE_EMPTY)",
sqlite3.SQLITE_ERROR: "Generic error (SQLITE_ERROR)",
sqlite3.SQLITE_FORMAT: "Not used (SQLITE_FORMAT)",
sqlite3.SQLITE_FULL: "Insertion failed because database is full (SQLITE_FULL)",
sqlite3.SQLITE_INTERNAL: "Internal logic error in SQLite (SQLITE_INTERNAL)",
sqlite3.SQLITE_INTERRUPT: "Operation terminated by sqlite3_interrupt()(SQLITE_INTERRUPT)",
sqlite3.SQLITE_IOERR | (1 << 8): "(SQLITE_IOERR_READ)",
sqlite3.SQLITE_IOERR | (10 << 8): "(SQLITE_IOERR_DELETE)",
sqlite3.SQLITE_IOERR | (11 << 8): "(SQLITE_IOERR_BLOCKED)",
sqlite3.SQLITE_IOERR | (12 << 8): "(SQLITE_IOERR_NOMEM)",
sqlite3.SQLITE_IOERR | (13 << 8): "(SQLITE_IOERR_ACCESS)",
sqlite3.SQLITE_IOERR | (14 << 8): "(SQLITE_IOERR_CHECKRESERVEDLOCK)",
sqlite3.SQLITE_IOERR | (15 << 8): "(SQLITE_IOERR_LOCK)",
sqlite3.SQLITE_IOERR | (16 << 8): "(SQLITE_IOERR_CLOSE)",
sqlite3.SQLITE_IOERR | (17 << 8): "(SQLITE_IOERR_DIR_CLOSE)",
sqlite3.SQLITE_IOERR | (2 << 8): "(SQLITE_IOERR_SHORT_READ)",
sqlite3.SQLITE_IOERR | (3 << 8): "(SQLITE_IOERR_WRITE)",
sqlite3.SQLITE_IOERR | (4 << 8): "(SQLITE_IOERR_FSYNC)",
sqlite3.SQLITE_IOERR | (5 << 8): "(SQLITE_IOERR_DIR_FSYNC)",
sqlite3.SQLITE_IOERR | (6 << 8): "(SQLITE_IOERR_TRUNCATE)",
sqlite3.SQLITE_IOERR | (7 << 8): "(SQLITE_IOERR_FSTAT)",
sqlite3.SQLITE_IOERR | (8 << 8): "(SQLITE_IOERR_UNLOCK)",
sqlite3.SQLITE_IOERR | (9 << 8): "(SQLITE_IOERR_RDLOCK)",
sqlite3.SQLITE_IOERR: "Some kind of disk I/O error occurred (SQLITE_IOERR)",
sqlite3.SQLITE_LOCKED | (1 << 8): "(SQLITE_LOCKED_SHAREDCACHE)",
sqlite3.SQLITE_LOCKED: "A table in the database is locked (SQLITE_LOCKED)",
sqlite3.SQLITE_MISMATCH: "Data type mismatch (SQLITE_MISMATCH)",
sqlite3.SQLITE_MISUSE: "Library used incorrectly (SQLITE_MISUSE)",
sqlite3.SQLITE_NOLFS: "Uses OS features not supported on host (SQLITE_NOLFS)",
sqlite3.SQLITE_NOMEM: "A malloc() failed (SQLITE_NOMEM)",
sqlite3.SQLITE_NOTADB: "File opened that is not a database file (SQLITE_NOTADB)",
sqlite3.SQLITE_NOTFOUND: "Unknown opcode in sqlite3_file_control() (SQLITE_NOTFOUND)",
sqlite3.SQLITE_NOTICE: "Notifications from sqlite3_log() (SQLITE_NOTICE)",
sqlite3.SQLITE_PERM: "Access permission denied (SQLITE_PERM)",
sqlite3.SQLITE_PROTOCOL: "Database lock protocol error (SQLITE_PROTOCOL)",
sqlite3.SQLITE_RANGE: "2nd parameter to sqlite3_bind out of range (SQLITE_RANGE)",
sqlite3.SQLITE_READONLY: "Attempt to write a readonly database (SQLITE_READONLY)",
sqlite3.SQLITE_ROW: "sqlite3_step() has another row ready (SQLITE_ROW)",
sqlite3.SQLITE_SCHEMA: "The database schema changed (SQLITE_SCHEMA)",
sqlite3.SQLITE_TOOBIG: "String or BLOB exceeds size limit (SQLITE_TOOBIG)",
sqlite3.SQLITE_WARNING: "Warnings from sqlite3_log() (SQLITE_WARNING)",
}
)
func init() {
sql.Register(driverName, newDriver())
}
type result struct {
lastInsertID int64
rowsAffected int
}
func newResult(c *conn) (_ *result, err error) {
r := &result{}
if r.rowsAffected, err = c.changes(); err != nil {
return nil, err
}
if r.lastInsertID, err = c.lastInsertRowID(); err != nil {
return nil, err
}
return r, nil
}
// LastInsertId returns the database's auto-generated ID after, for example, an
// INSERT into a table with primary key.
func (r *result) LastInsertId() (int64, error) {
if r == nil {
return 0, nil
}
return r.lastInsertID, nil
}
// RowsAffected returns the number of rows affected by the query.
func (r *result) RowsAffected() (int64, error) {
if r == nil {
return 0, nil
}
return int64(r.rowsAffected), nil
}
type rows struct {
allocs []uintptr
c *conn
columns []string
pstmt uintptr
doStep bool
empty bool
}
func newRows(c *conn, pstmt uintptr, allocs []uintptr, empty bool) (r *rows, err error) {
r = &rows{c: c, pstmt: pstmt, allocs: allocs, empty: empty}
defer func() {
if err != nil {
r.Close()
r = nil
}
}()
n, err := c.columnCount(pstmt)
if err != nil {
return nil, err
}
r.columns = make([]string, n)
for i := range r.columns {
if r.columns[i], err = r.c.columnName(pstmt, i); err != nil {
return nil, err
}
}
return r, nil
}
// Close closes the rows iterator.
func (r *rows) Close() (err error) {
for _, v := range r.allocs {
r.c.free(v)
}
r.allocs = nil
return r.c.finalize(r.pstmt)
}
// Columns returns the names of the columns. The number of columns of the
// result is inferred from the length of the slice. If a particular column name
// isn't known, an empty string should be returned for that entry.
func (r *rows) Columns() (c []string) {
return r.columns
}
// Next is called to populate the next row of data into the provided slice. The
// provided slice will be the same size as the Columns() are wide.
//
// Next should return io.EOF when there are no more rows.
func (r *rows) Next(dest []driver.Value) (err error) {
if r.empty {
return io.EOF
}
rc := sqlite3.SQLITE_ROW
if r.doStep {
if rc, err = r.c.step(r.pstmt); err != nil {
return err
}
}
r.doStep = true
switch rc {
case sqlite3.SQLITE_ROW:
if g, e := len(dest), len(r.columns); g != e {
return fmt.Errorf("sqlite: Next: have %v destination values, expected %v", g, e)
}
for i := range dest {
ct, err := r.c.columnType(r.pstmt, i)
if err != nil {
return err
}
switch ct {
case sqlite3.SQLITE_INTEGER:
v, err := r.c.columnInt64(r.pstmt, i)
if err != nil {
return err
}
dest[i] = v
case sqlite3.SQLITE_FLOAT:
v, err := r.c.columnDouble(r.pstmt, i)
if err != nil {
return err
}
dest[i] = v
case sqlite3.SQLITE_TEXT:
v, err := r.c.columnText(r.pstmt, i)
if err != nil {
return err
}
switch r.ColumnTypeDatabaseTypeName(i) {
case "DATE", "DATETIME", "TIMESTAMP":
dest[i], _ = r.c.parseTime(v)
default:
dest[i] = v
}
case sqlite3.SQLITE_BLOB:
v, err := r.c.columnBlob(r.pstmt, i)
if err != nil {
return err
}
dest[i] = v
case sqlite3.SQLITE_NULL:
dest[i] = nil
default:
return fmt.Errorf("internal error: rc %d", rc)
}
}
return nil
case sqlite3.SQLITE_DONE:
return io.EOF
default:
return r.c.errstr(int32(rc))
}
}
// Inspired by mattn/go-sqlite3: https://github.com/mattn/go-sqlite3/blob/ab91e934/sqlite3.go#L210-L226
//
// These time.Parse formats handle formats 1 through 7 listed at https://www.sqlite.org/lang_datefunc.html.
var parseTimeFormats = []string{
"2006-01-02 15:04:05.999999999-07:00",
"2006-01-02T15:04:05.999999999-07:00",
"2006-01-02 15:04:05.999999999",
"2006-01-02T15:04:05.999999999",
"2006-01-02 15:04",
"2006-01-02T15:04",
"2006-01-02",
}
// Attempt to parse s as a time. Return (s, false) if s is not
// recognized as a valid time encoding.
func (c *conn) parseTime(s string) (interface{}, bool) {
if v, ok := c.parseTimeString(s, strings.Index(s, "m=")); ok {
return v, true
}
ts := strings.TrimSuffix(s, "Z")
for _, f := range parseTimeFormats {
t, err := time.Parse(f, ts)
if err == nil {
return t, true
}
}
return s, false
}
// Attempt to parse s as a time string produced by t.String(). If x > 0 it's
// the index of substring "m=" within s. Return (s, false) if s is
// not recognized as a valid time encoding.
func (c *conn) parseTimeString(s0 string, x int) (interface{}, bool) {
s := s0
if x > 0 {
s = s[:x] // "2006-01-02 15:04:05.999999999 -0700 MST m=+9999" -> "2006-01-02 15:04:05.999999999 -0700 MST "
}
s = strings.TrimSpace(s)
if t, err := time.Parse("2006-01-02 15:04:05.999999999 -0700 MST", s); err == nil {
return t, true
}
return s0, false
}
// RowsColumnTypeDatabaseTypeName may be implemented by Rows. It should return
// the database system type name without the length. Type names should be
// uppercase. Examples of returned types: "VARCHAR", "NVARCHAR", "VARCHAR2",
// "CHAR", "TEXT", "DECIMAL", "SMALLINT", "INT", "BIGINT", "BOOL", "[]BIGINT",
// "JSONB", "XML", "TIMESTAMP".
func (r *rows) ColumnTypeDatabaseTypeName(index int) string {
return strings.ToUpper(r.c.columnDeclType(r.pstmt, index))
}
// RowsColumnTypeLength may be implemented by Rows. It should return the length
// of the column type if the column is a variable length type. If the column is
// not a variable length type ok should return false. If length is not limited
// other than system limits, it should return math.MaxInt64. The following are
// examples of returned values for various types:
//
// TEXT (math.MaxInt64, true)
// varchar(10) (10, true)
// nvarchar(10) (10, true)
// decimal (0, false)
// int (0, false)
// bytea(30) (30, true)
func (r *rows) ColumnTypeLength(index int) (length int64, ok bool) {
t, err := r.c.columnType(r.pstmt, index)
if err != nil {
return 0, false
}
switch t {
case sqlite3.SQLITE_INTEGER:
return 0, false
case sqlite3.SQLITE_FLOAT:
return 0, false
case sqlite3.SQLITE_TEXT:
return math.MaxInt64, true
case sqlite3.SQLITE_BLOB:
return math.MaxInt64, true
case sqlite3.SQLITE_NULL:
return 0, false
default:
return 0, false
}
}
// RowsColumnTypeNullable may be implemented by Rows. The nullable value should
// be true if it is known the column may be null, or false if the column is
// known to be not nullable. If the column nullability is unknown, ok should be
// false.
func (r *rows) ColumnTypeNullable(index int) (nullable, ok bool) {
return true, true
}
// RowsColumnTypePrecisionScale may be implemented by Rows. It should return
// the precision and scale for decimal types. If not applicable, ok should be
// false. The following are examples of returned values for various types:
//
// decimal(38, 4) (38, 4, true)
// int (0, 0, false)
// decimal (math.MaxInt64, math.MaxInt64, true)
func (r *rows) ColumnTypePrecisionScale(index int) (precision, scale int64, ok bool) {
return 0, 0, false
}
// RowsColumnTypeScanType may be implemented by Rows. It should return the
// value type that can be used to scan types into. For example, the database
// column type "bigint" this should return "reflect.TypeOf(int64(0))".
func (r *rows) ColumnTypeScanType(index int) reflect.Type {
t, err := r.c.columnType(r.pstmt, index)
if err != nil {
return reflect.TypeOf("")
}
switch t {
case sqlite3.SQLITE_INTEGER:
switch strings.ToLower(r.c.columnDeclType(r.pstmt, index)) {
case "boolean":
return reflect.TypeOf(false)
case "date", "datetime", "time", "timestamp":
return reflect.TypeOf(time.Time{})
default:
return reflect.TypeOf(int64(0))
}
case sqlite3.SQLITE_FLOAT:
return reflect.TypeOf(float64(0))
case sqlite3.SQLITE_TEXT:
return reflect.TypeOf("")
case sqlite3.SQLITE_BLOB:
return reflect.SliceOf(reflect.TypeOf([]byte{}))
case sqlite3.SQLITE_NULL:
return reflect.TypeOf(nil)
default:
return reflect.TypeOf("")
}
}
type stmt struct {
c *conn
psql uintptr
}
func newStmt(c *conn, sql string) (*stmt, error) {
p, err := libc.CString(sql)
if err != nil {
return nil, err
}
stm := stmt{c: c, psql: p}
return &stm, nil
}
// Close closes the statement.
//
// As of Go 1.1, a Stmt will not be closed if it's in use by any queries.
func (s *stmt) Close() (err error) {
s.c.free(s.psql)
s.psql = 0
return nil
}
// Exec executes a query that doesn't return rows, such as an INSERT or UPDATE.
//
//
// Deprecated: Drivers should implement StmtExecContext instead (or
// additionally).
func (s *stmt) Exec(args []driver.Value) (driver.Result, error) { //TODO StmtExecContext
return s.exec(context.Background(), toNamedValues(args))
}
// toNamedValues converts []driver.Value to []driver.NamedValue
func toNamedValues(vals []driver.Value) (r []driver.NamedValue) {
r = make([]driver.NamedValue, len(vals))
for i, val := range vals {
r[i] = driver.NamedValue{Value: val, Ordinal: i + 1}
}
return r
}
func (s *stmt) exec(ctx context.Context, args []driver.NamedValue) (r driver.Result, err error) {
var pstmt uintptr
var done int32
if ctx != nil && ctx.Done() != nil {
donech := make(chan struct{})
go func() {
select {
case <-ctx.Done():
atomic.AddInt32(&done, 1)
s.c.interrupt(s.c.db)
case <-donech:
}
}()
defer func() {
close(donech)
}()
}
for psql := s.psql; *(*byte)(unsafe.Pointer(psql)) != 0 && atomic.LoadInt32(&done) == 0; {
if pstmt, err = s.c.prepareV2(&psql); err != nil {
return nil, err
}
if pstmt == 0 {
continue
}
err = func() (err error) {
n, err := s.c.bindParameterCount(pstmt)
if err != nil {
return err
}
if n != 0 {
allocs, err := s.c.bind(pstmt, n, args)
if err != nil {
return err
}
if len(allocs) != 0 {
defer func() {
for _, v := range allocs {
s.c.free(v)
}
}()
}
}
rc, err := s.c.step(pstmt)
if err != nil {
return err
}
switch rc & 0xff {
case sqlite3.SQLITE_DONE, sqlite3.SQLITE_ROW:
// nop
default:
return s.c.errstr(int32(rc))
}
return nil
}()
if e := s.c.finalize(pstmt); e != nil && err == nil {
err = e
}
if err != nil {
return nil, err
}
}
return newResult(s.c)
}
// NumInput returns the number of placeholder parameters.
//
// If NumInput returns >= 0, the sql package will sanity check argument counts
// from callers and return errors to the caller before the statement's Exec or
// Query methods are called.
//
// NumInput may also return -1, if the driver doesn't know its number of
// placeholders. In that case, the sql package will not sanity check Exec or
// Query argument counts.
func (s *stmt) NumInput() (n int) {
return -1
}
// Query executes a query that may return rows, such as a
// SELECT.
//
// Deprecated: Drivers should implement StmtQueryContext instead (or
// additionally).
func (s *stmt) Query(args []driver.Value) (driver.Rows, error) { //TODO StmtQueryContext
return s.query(context.Background(), toNamedValues(args))
}
func (s *stmt) query(ctx context.Context, args []driver.NamedValue) (r driver.Rows, err error) {
var pstmt uintptr
var done int32
if ctx != nil && ctx.Done() != nil {
donech := make(chan struct{})
go func() {
select {
case <-ctx.Done():
atomic.AddInt32(&done, 1)
s.c.interrupt(s.c.db)
case <-donech:
}
}()
defer func() {
close(donech)
}()
}
var allocs []uintptr
for psql := s.psql; *(*byte)(unsafe.Pointer(psql)) != 0 && atomic.LoadInt32(&done) == 0; {
if pstmt, err = s.c.prepareV2(&psql); err != nil {
return nil, err
}
if pstmt == 0 {
continue
}
err = func() (err error) {
n, err := s.c.bindParameterCount(pstmt)
if err != nil {
return err
}
if n != 0 {
if allocs, err = s.c.bind(pstmt, n, args); err != nil {
return err
}
}
rc, err := s.c.step(pstmt)
if err != nil {
return err
}
switch rc & 0xff {
case sqlite3.SQLITE_ROW:
if r != nil {
r.Close()
}
if r, err = newRows(s.c, pstmt, allocs, false); err != nil {
return err
}
pstmt = 0
return nil
case sqlite3.SQLITE_DONE:
if r == nil {
if r, err = newRows(s.c, pstmt, allocs, true); err != nil {
return err
}
pstmt = 0
return nil
}
// nop
default:
return s.c.errstr(int32(rc))
}
if *(*byte)(unsafe.Pointer(psql)) == 0 {
if r != nil {
r.Close()
}
if r, err = newRows(s.c, pstmt, allocs, true); err != nil {
return err
}
pstmt = 0
}
return nil
}()
if e := s.c.finalize(pstmt); e != nil && err == nil {
err = e
}
if err != nil {
return nil, err
}
}
return r, err
}
type tx struct {
c *conn
}
func newTx(c *conn) (*tx, error) {
r := &tx{c: c}
if err := r.exec(context.Background(), "begin"); err != nil {
return nil, err
}
return r, nil
}
// Commit implements driver.Tx.
func (t *tx) Commit() (err error) {
return t.exec(context.Background(), "commit")
}
// Rollback implements driver.Tx.
func (t *tx) Rollback() (err error) {
return t.exec(context.Background(), "rollback")
}
func (t *tx) exec(ctx context.Context, sql string) (err error) {
psql, err := libc.CString(sql)
if err != nil {
return err
}
defer t.c.free(psql)
//TODO use t.conn.ExecContext() instead
if ctx != nil && ctx.Done() != nil {
donech := make(chan struct{})
go func() {
select {
case <-ctx.Done():
t.c.interrupt(t.c.db)
case <-donech:
}
}()
defer func() {
close(donech)
}()
}
if rc := sqlite3.Xsqlite3_exec(t.c.tls, t.c.db, psql, 0, 0, 0); rc != sqlite3.SQLITE_OK {
return t.c.errstr(rc)
}
return nil
}
type conn struct {
db uintptr // *sqlite3.Xsqlite3
tls *libc.TLS
// Context handling can cause conn.Close and conn.interrupt to be invoked
// concurrently.
sync.Mutex
}
func newConn(dsn string) (*conn, error) {
var query string
// Parse the query parameters from the dsn and them from the dsn if not prefixed by file:
// https://github.com/mattn/go-sqlite3/blob/3392062c729d77820afc1f5cae3427f0de39e954/sqlite3.go#L1046
// https://github.com/mattn/go-sqlite3/blob/3392062c729d77820afc1f5cae3427f0de39e954/sqlite3.go#L1383
pos := strings.IndexRune(dsn, '?')
if pos >= 1 {
query = dsn[pos+1:]
if !strings.HasPrefix(dsn, "file:") {
dsn = dsn[:pos]
}
}
c := &conn{tls: libc.NewTLS()}
db, err := c.openV2(
dsn,
sqlite3.SQLITE_OPEN_READWRITE|sqlite3.SQLITE_OPEN_CREATE|
sqlite3.SQLITE_OPEN_FULLMUTEX|
sqlite3.SQLITE_OPEN_URI,
)
if err != nil {
return nil, err
}
c.db = db
if err = c.extendedResultCodes(true); err != nil {
c.Close()
return nil, err
}
if err = applyPragmas(c, query); err != nil {
c.Close()
return nil, err
}
return c, nil
}
func applyPragmas(c *conn, query string) error {
q, err := url.ParseQuery(query)
if err != nil {
return err
}
for _, v := range q["_pragma"] {
cmd := "pragma " + v
_, err := c.exec(context.Background(), cmd, nil)
if err != nil {
return err
}
}
return nil
}
// const void *sqlite3_column_blob(sqlite3_stmt*, int iCol);
func (c *conn) columnBlob(pstmt uintptr, iCol int) (v []byte, err error) {
p := sqlite3.Xsqlite3_column_blob(c.tls, pstmt, int32(iCol))
len, err := c.columnBytes(pstmt, iCol)
if err != nil {
return nil, err
}
if p == 0 || len == 0 {
return nil, nil
}
v = make([]byte, len)
copy(v, (*libc.RawMem)(unsafe.Pointer(p))[:len:len])
return v, nil
}
// int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
func (c *conn) columnBytes(pstmt uintptr, iCol int) (_ int, err error) {
v := sqlite3.Xsqlite3_column_bytes(c.tls, pstmt, int32(iCol))
return int(v), nil
}
// const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol);
func (c *conn) columnText(pstmt uintptr, iCol int) (v string, err error) {
p := sqlite3.Xsqlite3_column_text(c.tls, pstmt, int32(iCol))
len, err := c.columnBytes(pstmt, iCol)
if err != nil {
return "", err
}
if p == 0 || len == 0 {
return "", nil
}
b := make([]byte, len)
copy(b, (*libc.RawMem)(unsafe.Pointer(p))[:len:len])
return string(b), nil
}
// double sqlite3_column_double(sqlite3_stmt*, int iCol);
func (c *conn) columnDouble(pstmt uintptr, iCol int) (v float64, err error) {
v = sqlite3.Xsqlite3_column_double(c.tls, pstmt, int32(iCol))
return v, nil
}
// sqlite3_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol);
func (c *conn) columnInt64(pstmt uintptr, iCol int) (v int64, err error) {
v = sqlite3.Xsqlite3_column_int64(c.tls, pstmt, int32(iCol))
return v, nil
}
// int sqlite3_column_type(sqlite3_stmt*, int iCol);
func (c *conn) columnType(pstmt uintptr, iCol int) (_ int, err error) {
v := sqlite3.Xsqlite3_column_type(c.tls, pstmt, int32(iCol))
return int(v), nil
}
// const char *sqlite3_column_decltype(sqlite3_stmt*,int);
func (c *conn) columnDeclType(pstmt uintptr, iCol int) string {
return libc.GoString(sqlite3.Xsqlite3_column_decltype(c.tls, pstmt, int32(iCol)))
}
// const char *sqlite3_column_name(sqlite3_stmt*, int N);
func (c *conn) columnName(pstmt uintptr, n int) (string, error) {
p := sqlite3.Xsqlite3_column_name(c.tls, pstmt, int32(n))
return libc.GoString(p), nil
}
// int sqlite3_column_count(sqlite3_stmt *pStmt);
func (c *conn) columnCount(pstmt uintptr) (_ int, err error) {
v := sqlite3.Xsqlite3_column_count(c.tls, pstmt)
return int(v), nil
}
// sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*);
func (c *conn) lastInsertRowID() (v int64, _ error) {
return sqlite3.Xsqlite3_last_insert_rowid(c.tls, c.db), nil
}
// int sqlite3_changes(sqlite3*);
func (c *conn) changes() (int, error) {
v := sqlite3.Xsqlite3_changes(c.tls, c.db)
return int(v), nil
}
// int sqlite3_step(sqlite3_stmt*);
func (c *conn) step(pstmt uintptr) (int, error) {
for {
switch rc := sqlite3.Xsqlite3_step(c.tls, pstmt); rc {
case sqliteLockedSharedcache, sqlite3.SQLITE_BUSY:
if err := c.retry(pstmt); err != nil {
return sqlite3.SQLITE_LOCKED, err
}
default:
return int(rc), nil
}
}
}
func (c *conn) retry(pstmt uintptr) error {
mu := mutexAlloc(c.tls)
(*mutex)(unsafe.Pointer(mu)).Lock()
rc := sqlite3.Xsqlite3_unlock_notify(
c.tls,
c.db,
*(*uintptr)(unsafe.Pointer(&struct {
f func(*libc.TLS, uintptr, int32)
}{unlockNotify})),
mu,
)
if rc == sqlite3.SQLITE_LOCKED { // Deadlock, see https://www.sqlite.org/c3ref/unlock_notify.html
(*mutex)(unsafe.Pointer(mu)).Unlock()
mutexFree(c.tls, mu)
return c.errstr(rc)
}
(*mutex)(unsafe.Pointer(mu)).Lock()
(*mutex)(unsafe.Pointer(mu)).Unlock()
mutexFree(c.tls, mu)
if pstmt != 0 {
sqlite3.Xsqlite3_reset(c.tls, pstmt)
}
return nil
}
func unlockNotify(t *libc.TLS, ppArg uintptr, nArg int32) {
for i := int32(0); i < nArg; i++ {
mu := *(*uintptr)(unsafe.Pointer(ppArg))
(*mutex)(unsafe.Pointer(mu)).Unlock()
ppArg += ptrSize
}
}
func (c *conn) bind(pstmt uintptr, n int, args []driver.NamedValue) (allocs []uintptr, err error) {
defer func() {
if err == nil {
return
}
for _, v := range allocs {
c.free(v)
}
allocs = nil
}()
for i := 1; i <= n; i++ {
name, err := c.bindParameterName(pstmt, i)
if err != nil {
return allocs, err
}
var found bool
var v driver.NamedValue
for _, v = range args {
if name != "" {
// For ?NNN and $NNN params, match if NNN == v.Ordinal.
//
// Supporting this for $NNN is a special case that makes eg
// `select $1, $2, $3 ...` work without needing to use
// sql.Named.
if (name[0] == '?' || name[0] == '$') && name[1:] == strconv.Itoa(v.Ordinal) {
found = true
break
}
// sqlite supports '$', '@' and ':' prefixes for string
// identifiers and '?' for numeric, so we cannot
// combine different prefixes with the same name
// because `database/sql` requires variable names
// to start with a letter
if name[1:] == v.Name[:] {
found = true
break
}
} else {
if v.Ordinal == i {
found = true
break
}
}
}
if !found {
if name != "" {
return allocs, fmt.Errorf("missing named argument %q", name[1:])
}
return allocs, fmt.Errorf("missing argument with index %d", i)
}
var p uintptr
switch x := v.Value.(type) {
case int64:
if err := c.bindInt64(pstmt, i, x); err != nil {
return allocs, err
}
case float64:
if err := c.bindDouble(pstmt, i, x); err != nil {
return allocs, err
}
case bool:
v := 0
if x {
v = 1
}
if err := c.bindInt(pstmt, i, v); err != nil {
return allocs, err
}
case []byte:
if p, err = c.bindBlob(pstmt, i, x); err != nil {
return allocs, err
}
case string:
if p, err = c.bindText(pstmt, i, x); err != nil {
return allocs, err
}
case time.Time:
if p, err = c.bindText(pstmt, i, x.String()); err != nil {
return allocs, err
}
case nil:
if p, err = c.bindNull(pstmt, i); err != nil {
return allocs, err
}
default:
return allocs, fmt.Errorf("sqlite: invalid driver.Value type %T", x)
}
if p != 0 {
allocs = append(allocs, p)
}
}
return allocs, nil
}
// int sqlite3_bind_null(sqlite3_stmt*, int);
func (c *conn) bindNull(pstmt uintptr, idx1 int) (uintptr, error) {
if rc := sqlite3.Xsqlite3_bind_null(c.tls, pstmt, int32(idx1)); rc != sqlite3.SQLITE_OK {
return 0, c.errstr(rc)
}
return 0, nil
}
// int sqlite3_bind_text(sqlite3_stmt*,int,const char*,int,void(*)(void*));
func (c *conn) bindText(pstmt uintptr, idx1 int, value string) (uintptr, error) {
p, err := libc.CString(value)
if err != nil {
return 0, err
}
if rc := sqlite3.Xsqlite3_bind_text(c.tls, pstmt, int32(idx1), p, int32(len(value)), 0); rc != sqlite3.SQLITE_OK {
c.free(p)
return 0, c.errstr(rc)
}
return p, nil
}
// int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
func (c *conn) bindBlob(pstmt uintptr, idx1 int, value []byte) (uintptr, error) {
p, err := c.malloc(len(value))
if err != nil {
return 0, err
}
if len(value) != 0 {
copy((*libc.RawMem)(unsafe.Pointer(p))[:len(value):len(value)], value)
}
if rc := sqlite3.Xsqlite3_bind_blob(c.tls, pstmt, int32(idx1), p, int32(len(value)), 0); rc != sqlite3.SQLITE_OK {
c.free(p)
return 0, c.errstr(rc)
}
return p, nil
}
// int sqlite3_bind_int(sqlite3_stmt*, int, int);
func (c *conn) bindInt(pstmt uintptr, idx1, value int) (err error) {
if rc := sqlite3.Xsqlite3_bind_int(c.tls, pstmt, int32(idx1), int32(value)); rc != sqlite3.SQLITE_OK {
return c.errstr(rc)
}
return nil
}
// int sqlite3_bind_double(sqlite3_stmt*, int, double);
func (c *conn) bindDouble(pstmt uintptr, idx1 int, value float64) (err error) {
if rc := sqlite3.Xsqlite3_bind_double(c.tls, pstmt, int32(idx1), value); rc != 0 {
return c.errstr(rc)
}
return nil
}
// int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite3_int64);
func (c *conn) bindInt64(pstmt uintptr, idx1 int, value int64) (err error) {
if rc := sqlite3.Xsqlite3_bind_int64(c.tls, pstmt, int32(idx1), value); rc != sqlite3.SQLITE_OK {
return c.errstr(rc)
}
return nil
}
// const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int);
func (c *conn) bindParameterName(pstmt uintptr, i int) (string, error) {
p := sqlite3.Xsqlite3_bind_parameter_name(c.tls, pstmt, int32(i))
return libc.GoString(p), nil
}
// int sqlite3_bind_parameter_count(sqlite3_stmt*);
func (c *conn) bindParameterCount(pstmt uintptr) (_ int, err error) {
r := sqlite3.Xsqlite3_bind_parameter_count(c.tls, pstmt)
return int(r), nil
}
// int sqlite3_finalize(sqlite3_stmt *pStmt);
func (c *conn) finalize(pstmt uintptr) error {
if rc := sqlite3.Xsqlite3_finalize(c.tls, pstmt); rc != sqlite3.SQLITE_OK {
return c.errstr(rc)
}
return nil
}
// int sqlite3_prepare_v2(
// sqlite3 *db, /* Database handle */
// const char *zSql, /* SQL statement, UTF-8 encoded */
// int nByte, /* Maximum length of zSql in bytes. */
// sqlite3_stmt **ppStmt, /* OUT: Statement handle */
// const char **pzTail /* OUT: Pointer to unused portion of zSql */
// );
func (c *conn) prepareV2(zSQL *uintptr) (pstmt uintptr, err error) {
var ppstmt, pptail uintptr
defer func() {
c.free(ppstmt)
c.free(pptail)
}()
if ppstmt, err = c.malloc(int(ptrSize)); err != nil {
return 0, err
}
if pptail, err = c.malloc(int(ptrSize)); err != nil {
return 0, err
}
for {
switch rc := sqlite3.Xsqlite3_prepare_v2(c.tls, c.db, *zSQL, -1, ppstmt, pptail); rc {
case sqlite3.SQLITE_OK:
*zSQL = *(*uintptr)(unsafe.Pointer(pptail))
return *(*uintptr)(unsafe.Pointer(ppstmt)), nil
case sqliteLockedSharedcache, sqlite3.SQLITE_BUSY:
if err := c.retry(0); err != nil {
return 0, err
}
default:
return 0, c.errstr(rc)
}
}
}
// void sqlite3_interrupt(sqlite3*);
func (c *conn) interrupt(pdb uintptr) (err error) {
c.Lock() // Defend against race with .Close invoked by context handling.
defer c.Unlock()
if c.tls != nil {
sqlite3.Xsqlite3_interrupt(c.tls, pdb)
}
return nil
}
// int sqlite3_extended_result_codes(sqlite3*, int onoff);
func (c *conn) extendedResultCodes(on bool) error {
if rc := sqlite3.Xsqlite3_extended_result_codes(c.tls, c.db, libc.Bool32(on)); rc != sqlite3.SQLITE_OK {
return c.errstr(rc)
}
return nil
}
// int sqlite3_open_v2(
// const char *filename, /* Database filename (UTF-8) */
// sqlite3 **ppDb, /* OUT: SQLite db handle */
// int flags, /* Flags */
// const char *zVfs /* Name of VFS module to use */
// );
func (c *conn) openV2(name string, flags int32) (uintptr, error) {
var p, s uintptr
defer func() {
if p != 0 {
c.free(p)
}
if s != 0 {
c.free(s)
}
}()
p, err := c.malloc(int(ptrSize))
if err != nil {
return 0, err
}
if s, err = libc.CString(name); err != nil {
return 0, err
}
if rc := sqlite3.Xsqlite3_open_v2(c.tls, s, p, flags, 0); rc != sqlite3.SQLITE_OK {
return 0, c.errstr(rc)
}
return *(*uintptr)(unsafe.Pointer(p)), nil
}
func (c *conn) malloc(n int) (uintptr, error) {
if p := libc.Xmalloc(c.tls, types.Size_t(n)); p != 0 || n == 0 {
return p, nil
}
return 0, fmt.Errorf("sqlite: cannot allocate %d bytes of memory", n)
}
func (c *conn) free(p uintptr) {
if p != 0 {
libc.Xfree(c.tls, p)
}
}
// const char *sqlite3_errstr(int);
func (c *conn) errstr(rc int32) error {
p := sqlite3.Xsqlite3_errstr(c.tls, rc)
str := libc.GoString(p)
p = sqlite3.Xsqlite3_errmsg(c.tls, c.db)
switch msg := libc.GoString(p); {
case msg == str:
return &Error{msg: fmt.Sprintf("%s (%v)", str, rc), code: int(rc)}
default:
return &Error{msg: fmt.Sprintf("%s: %s (%v)", str, msg, rc), code: int(rc)}
}
}
// Begin starts a transaction.
//
// Deprecated: Drivers should implement ConnBeginTx instead (or additionally).
func (c *conn) Begin() (driver.Tx, error) {
return c.begin(context.Background(), driver.TxOptions{})
}
func (c *conn) begin(ctx context.Context, opts driver.TxOptions) (t driver.Tx, err error) {
return newTx(c)
}
// Close invalidates and potentially stops any current prepared statements and
// transactions, marking this connection as no longer in use.
//
// Because the sql package maintains a free pool of connections and only calls
// Close when there's a surplus of idle connections, it shouldn't be necessary
// for drivers to do their own connection caching.
func (c *conn) Close() error {
c.Lock() // Defend against race with .interrupt invoked by context handling.
defer c.Unlock()
if c.db != 0 {
if err := c.closeV2(c.db); err != nil {
return err
}
c.db = 0
}
if c.tls != nil {
c.tls.Close()
c.tls = nil
}
return nil
}
// int sqlite3_close_v2(sqlite3*);
func (c *conn) closeV2(db uintptr) error {
if rc := sqlite3.Xsqlite3_close_v2(c.tls, db); rc != sqlite3.SQLITE_OK {
return c.errstr(rc)
}
return nil
}
// Execer is an optional interface that may be implemented by a Conn.
//
// If a Conn does not implement Execer, the sql package's DB.Exec will first
// prepare a query, execute the statement, and then close the statement.
//
// Exec may return ErrSkip.
//
// Deprecated: Drivers should implement ExecerContext instead.
func (c *conn) Exec(query string, args []driver.Value) (driver.Result, error) {
return c.exec(context.Background(), query, toNamedValues(args))
}
func (c *conn) exec(ctx context.Context, query string, args []driver.NamedValue) (r driver.Result, err error) {
s, err := c.prepare(ctx, query)
if err != nil {
return nil, err
}
defer func() {
if err2 := s.Close(); err2 != nil && err == nil {
err = err2
}
}()
return s.(*stmt).exec(ctx, args)
}
// Prepare returns a prepared statement, bound to this connection.
func (c *conn) Prepare(query string) (driver.Stmt, error) {
return c.prepare(context.Background(), query)
}
func (c *conn) prepare(ctx context.Context, query string) (s driver.Stmt, err error) {
//TODO use ctx
return newStmt(c, query)
}
// Queryer is an optional interface that may be implemented by a Conn.
//
// If a Conn does not implement Queryer, the sql package's DB.Query will first
// prepare a query, execute the statement, and then close the statement.
//
// Query may return ErrSkip.
//
// Deprecated: Drivers should implement QueryerContext instead.
func (c *conn) Query(query string, args []driver.Value) (driver.Rows, error) {
return c.query(context.Background(), query, toNamedValues(args))
}
func (c *conn) query(ctx context.Context, query string, args []driver.NamedValue) (r driver.Rows, err error) {
s, err := c.prepare(ctx, query)
if err != nil {
return nil, err
}
defer func() {
if err2 := s.Close(); err2 != nil && err == nil {
err = err2
}
}()
return s.(*stmt).query(ctx, args)
}
// Driver implements database/sql/driver.Driver.
type Driver struct{}
func newDriver() *Driver { return &Driver{} }
// Open returns a new connection to the database. The name is a string in a
// driver-specific format.
//
// Open may return a cached connection (one previously closed), but doing so is
// unnecessary; the sql package maintains a pool of idle connections for
// efficient re-use.
//
// The returned connection is only used by one goroutine at a time.
func (d *Driver) Open(name string) (driver.Conn, error) {
return newConn(name)
}