forked from External/grumble
403 lines
10 KiB
Go
403 lines
10 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package sqlite provides access to the SQLite library, version 3.
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package sqlite
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/*
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#include "sqlite3.h"
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#include <stdlib.h>
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// These wrappers are necessary because SQLITE_TRANSIENT
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// is a pointer constant, and cgo doesn't translate them correctly.
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// The definition in sqlite3.h is:
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//
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// typedef void (*sqlite3_destructor_type)(void*);
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// #define SQLITE_STATIC ((sqlite3_destructor_type)0)
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// #define SQLITE_TRANSIENT ((sqlite3_destructor_type)-1)
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static int my_bind_text(sqlite3_stmt *stmt, int n, char *p, int np) {
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return sqlite3_bind_text(stmt, n, p, np, SQLITE_TRANSIENT);
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}
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static int my_bind_blob(sqlite3_stmt *stmt, int n, void *p, int np) {
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return sqlite3_bind_blob(stmt, n, p, np, SQLITE_TRANSIENT);
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}
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*/
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import "C"
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import (
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"errors"
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"fmt"
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"os"
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"reflect"
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"strconv"
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"time"
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"unsafe"
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)
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type Errno int
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func (e Errno) Error() string {
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s := errText[e]
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if s == "" {
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return fmt.Sprintf("errno %d", int(e))
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}
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return s
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}
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var (
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ErrError error = Errno(1) // /* SQL error or missing database */
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ErrInternal error = Errno(2) // /* Internal logic error in SQLite */
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ErrPerm error = Errno(3) // /* Access permission denied */
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ErrAbort error = Errno(4) // /* Callback routine requested an abort */
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ErrBusy error = Errno(5) // /* The database file is locked */
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ErrLocked error = Errno(6) // /* A table in the database is locked */
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ErrNoMem error = Errno(7) // /* A malloc() failed */
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ErrReadOnly error = Errno(8) // /* Attempt to write a readonly database */
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ErrInterrupt error = Errno(9) // /* Operation terminated by sqlite3_interrupt()*/
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ErrIOErr error = Errno(10) // /* Some kind of disk I/O error occurred */
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ErrCorrupt error = Errno(11) // /* The database disk image is malformed */
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ErrFull error = Errno(13) // /* Insertion failed because database is full */
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ErrCantOpen error = Errno(14) // /* Unable to open the database file */
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ErrEmpty error = Errno(16) // /* Database is empty */
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ErrSchema error = Errno(17) // /* The database schema changed */
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ErrTooBig error = Errno(18) // /* String or BLOB exceeds size limit */
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ErrConstraint error = Errno(19) // /* Abort due to constraint violation */
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ErrMismatch error = Errno(20) // /* Data type mismatch */
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ErrMisuse error = Errno(21) // /* Library used incorrectly */
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ErrNolfs error = Errno(22) // /* Uses OS features not supported on host */
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ErrAuth error = Errno(23) // /* Authorization denied */
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ErrFormat error = Errno(24) // /* Auxiliary database format error */
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ErrRange error = Errno(25) // /* 2nd parameter to sqlite3_bind out of range */
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ErrNotDB error = Errno(26) // /* File opened that is not a database file */
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Row = Errno(100) // /* sqlite3_step() has another row ready */
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Done = Errno(101) // /* sqlite3_step() has finished executing */
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)
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var errText = map[Errno]string{
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1: "SQL error or missing database",
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2: "Internal logic error in SQLite",
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3: "Access permission denied",
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4: "Callback routine requested an abort",
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5: "The database file is locked",
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6: "A table in the database is locked",
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7: "A malloc() failed",
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8: "Attempt to write a readonly database",
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9: "Operation terminated by sqlite3_interrupt()*/",
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10: "Some kind of disk I/O error occurred",
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11: "The database disk image is malformed",
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12: "NOT USED. Table or record not found",
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13: "Insertion failed because database is full",
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14: "Unable to open the database file",
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15: "NOT USED. Database lock protocol error",
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16: "Database is empty",
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17: "The database schema changed",
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18: "String or BLOB exceeds size limit",
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19: "Abort due to constraint violation",
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20: "Data type mismatch",
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21: "Library used incorrectly",
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22: "Uses OS features not supported on host",
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23: "Authorization denied",
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24: "Auxiliary database format error",
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25: "2nd parameter to sqlite3_bind out of range",
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26: "File opened that is not a database file",
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100: "sqlite3_step() has another row ready",
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101: "sqlite3_step() has finished executing",
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}
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func (c *Conn) error(rv C.int) error {
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if c == nil || c.db == nil {
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return errors.New("nil sqlite database")
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}
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if rv == 0 {
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return nil
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}
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if rv == 21 { // misuse
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return Errno(rv)
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}
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return errors.New(Errno(rv).Error() + ": " + C.GoString(C.sqlite3_errmsg(c.db)))
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}
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type Conn struct {
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db *C.sqlite3
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}
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func Version() string {
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p := C.sqlite3_libversion()
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return C.GoString(p)
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}
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func Open(filename string) (*Conn, error) {
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if C.sqlite3_threadsafe() == 0 {
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return nil, errors.New("sqlite library was not compiled for thread-safe operation")
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}
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var db *C.sqlite3
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name := C.CString(filename)
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defer C.free(unsafe.Pointer(name))
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rv := C.sqlite3_open_v2(name, &db,
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C.SQLITE_OPEN_FULLMUTEX|
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C.SQLITE_OPEN_READWRITE|
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C.SQLITE_OPEN_CREATE,
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nil)
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if rv != 0 {
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return nil, Errno(rv)
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}
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if db == nil {
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return nil, errors.New("sqlite succeeded without returning a database")
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}
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return &Conn{db}, nil
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}
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func NewBackup(dst *Conn, dstTable string, src *Conn, srcTable string) (*Backup, error) {
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dname := C.CString(dstTable)
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sname := C.CString(srcTable)
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defer C.free(unsafe.Pointer(dname))
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defer C.free(unsafe.Pointer(sname))
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sb := C.sqlite3_backup_init(dst.db, dname, src.db, sname)
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if sb == nil {
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return nil, dst.error(C.sqlite3_errcode(dst.db))
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}
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return &Backup{sb, dst, src}, nil
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}
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type Backup struct {
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sb *C.sqlite3_backup
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dst, src *Conn
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}
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func (b *Backup) Step(npage int) error {
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rv := C.sqlite3_backup_step(b.sb, C.int(npage))
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if rv == 0 || Errno(rv) == ErrBusy || Errno(rv) == ErrLocked {
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return nil
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}
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return Errno(rv)
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}
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type BackupStatus struct {
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Remaining int
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PageCount int
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}
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func (b *Backup) Status() BackupStatus {
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return BackupStatus{int(C.sqlite3_backup_remaining(b.sb)), int(C.sqlite3_backup_pagecount(b.sb))}
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}
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func (b *Backup) Run(npage int, sleepNs int64, c chan<- BackupStatus) error {
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var err error
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for {
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err = b.Step(npage)
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if err != nil {
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break
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}
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if c != nil {
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c <- b.Status()
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}
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time.Sleep(sleepNs)
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}
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return b.dst.error(C.sqlite3_errcode(b.dst.db))
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}
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func (b *Backup) Close() error {
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if b.sb == nil {
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return os.EINVAL
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}
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C.sqlite3_backup_finish(b.sb)
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b.sb = nil
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return nil
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}
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func (c *Conn) BusyTimeout(ms int) error {
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rv := C.sqlite3_busy_timeout(c.db, C.int(ms))
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if rv == 0 {
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return nil
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}
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return Errno(rv)
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}
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func (c *Conn) Exec(cmd string, args ...interface{}) error {
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s, err := c.Prepare(cmd)
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if err != nil {
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return err
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}
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defer s.Finalize()
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err = s.Exec(args...)
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if err != nil {
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return err
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}
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rv := C.sqlite3_step(s.stmt)
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if Errno(rv) != Done {
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return c.error(rv)
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}
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return nil
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}
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type Stmt struct {
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c *Conn
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stmt *C.sqlite3_stmt
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err error
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t0 int64
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sql string
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args string
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}
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func (c *Conn) Prepare(cmd string) (*Stmt, error) {
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if c == nil || c.db == nil {
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return nil, errors.New("nil sqlite database")
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}
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cmdstr := C.CString(cmd)
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defer C.free(unsafe.Pointer(cmdstr))
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var stmt *C.sqlite3_stmt
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var tail *C.char
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rv := C.sqlite3_prepare_v2(c.db, cmdstr, C.int(len(cmd)+1), &stmt, &tail)
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if rv != 0 {
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return nil, c.error(rv)
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}
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return &Stmt{c: c, stmt: stmt, sql: cmd, t0: time.Nanoseconds()}, nil
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}
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func (s *Stmt) Exec(args ...interface{}) error {
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s.args = fmt.Sprintf(" %v", []interface{}(args))
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rv := C.sqlite3_reset(s.stmt)
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if rv != 0 {
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return s.c.error(rv)
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}
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n := int(C.sqlite3_bind_parameter_count(s.stmt))
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if n != len(args) {
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return errors.New(fmt.Sprintf("incorrect argument count for Stmt.Exec: have %d want %d", len(args), n))
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}
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for i, v := range args {
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var str string
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switch v := v.(type) {
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case []byte:
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var p *byte
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if len(v) > 0 {
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p = &v[0]
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}
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if rv := C.my_bind_blob(s.stmt, C.int(i+1), unsafe.Pointer(p), C.int(len(v))); rv != 0 {
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return s.c.error(rv)
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}
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continue
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case bool:
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if v {
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str = "1"
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} else {
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str = "0"
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}
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default:
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str = fmt.Sprint(v)
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}
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cstr := C.CString(str)
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rv := C.my_bind_text(s.stmt, C.int(i+1), cstr, C.int(len(str)))
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C.free(unsafe.Pointer(cstr))
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if rv != 0 {
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return s.c.error(rv)
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}
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}
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return nil
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}
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func (s *Stmt) Error() error {
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return s.err
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}
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func (s *Stmt) Next() bool {
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rv := C.sqlite3_step(s.stmt)
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err := Errno(rv)
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if err == Row {
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return true
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}
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if err != Done {
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s.err = s.c.error(rv)
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}
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return false
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}
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func (s *Stmt) Reset() error {
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C.sqlite3_reset(s.stmt)
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return nil
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}
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func (s *Stmt) Scan(args ...interface{}) error {
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n := int(C.sqlite3_column_count(s.stmt))
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if n != len(args) {
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return errors.New(fmt.Sprintf("incorrect argument count for Stmt.Scan: have %d want %d", len(args), n))
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}
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for i, v := range args {
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n := C.sqlite3_column_bytes(s.stmt, C.int(i))
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p := C.sqlite3_column_blob(s.stmt, C.int(i))
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if p == nil && n > 0 {
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return errors.New("got nil blob")
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}
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var data []byte
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if n > 0 {
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data = (*[1 << 30]byte)(unsafe.Pointer(p))[0:n]
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}
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switch v := v.(type) {
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case *[]byte:
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*v = data
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case *string:
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*v = string(data)
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case *bool:
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*v = string(data) == "1"
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case *int:
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x, err := strconv.Atoi(string(data))
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if err != nil {
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return errors.New("arg " + strconv.Itoa(i) + " as int: " + err.Error())
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}
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*v = x
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case *int64:
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x, err := strconv.Atoi64(string(data))
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if err != nil {
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return errors.New("arg " + strconv.Itoa(i) + " as int64: " + err.Error())
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}
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*v = x
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case *float64:
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x, err := strconv.Atof64(string(data))
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if err != nil {
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return errors.New("arg " + strconv.Itoa(i) + " as float64: " + err.Error())
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}
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*v = x
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default:
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return errors.New("unsupported type in Scan: " + reflect.TypeOf(v).String())
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}
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}
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return nil
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}
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func (s *Stmt) SQL() string {
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return s.sql + s.args
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}
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func (s *Stmt) Nanoseconds() int64 {
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return time.Nanoseconds() - s.t0
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}
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func (s *Stmt) Finalize() error {
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rv := C.sqlite3_finalize(s.stmt)
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if rv != 0 {
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return s.c.error(rv)
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}
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return nil
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}
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func (c *Conn) Close() error {
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if c == nil || c.db == nil {
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return errors.New("nil sqlite database")
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}
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rv := C.sqlite3_close(c.db)
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if rv != 0 {
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return c.error(rv)
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}
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c.db = nil
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return nil
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}
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