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// 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.
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// Package sqlite is a sql/database driver using a CGo-free port of the C
// SQLite3 library.
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//
// SQLite is an in-process implementation of a self-contained, serverless,
// zero-configuration, transactional SQL database engine.
//
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// # Thanks
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//
// This project is sponsored by Schleibinger Geräte Teubert u. Greim GmbH by
// allowing one of the maintainers to work on it also in office hours.
//
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// # Supported platforms and architectures
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//
// These combinations of GOOS and GOARCH are currently supported
//
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// OS Arch SQLite version
// ------------------------------
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// darwin amd64 3.45.3
// darwin arm64 3.45.3
// freebsd amd64 3.45.3
// freebsd arm64 3.45.3
// linux 386 3.45.3
// linux amd64 3.45.3
// linux arm 3.45.3
// linux arm64 3.45.3
// linux loong64 3.45.3
// linux ppc64le 3.45.3
// linux riscv64 3.45.3
// linux s390x 3.45.3
// windows amd64 3.45.3
// windows arm64 3.45.3
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//
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// # Builders
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//
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// Builder results available at:
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//
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// https://modern-c.appspot.com/-/builder/?importpath=modernc.org%2fsqlite
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//
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// # Fragile modernc.org/libc dependency
//
// When you import this package you should use in your go.mod file the exact
// same version of modernc.org/libc as seen in the go.mod file of this
// repository.
//
// See the discussion at https://gitlab.com/cznic/sqlite/-/issues/177 for more details.
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//
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// # Changelog
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//
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// 2024-02-13: v1.29.0
//
// Upgrade to SQLite 3.45.1, release notes at https://sqlite.org/releaselog/3_45_1.html.
//
// 2023-12-14 v1.28.0:
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//
// (*Driver).RegisterConnectionHook: added
// ConnectionHookFn: added
// ExecQuerierContext: added
// RegisterConnectionHook: added
//
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// 2023-08-03 v1.25.0: enable SQLITE_ENABLE_DBSTAT_VTAB.
//
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// 2023-07-11 v1.24.0:
//
// Add (*conn).{Serialize,Deserialize,NewBackup,NewRestore} methods, add Backup type.
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//
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// 2023-06-01 v1.23.0:
//
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// Allow registering aggregate functions.
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//
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// 2023-04-22 v1.22.0:
//
// Support linux/s390x.
//
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// 2023-02-23 v1.21.0:
//
// Upgrade to SQLite 3.41.0, release notes at https://sqlite.org/releaselog/3_41_0.html.
//
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// 2022-11-28 v1.20.0
//
// Support linux/ppc64le.
//
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// 2022-09-16 v1.19.0:
//
// Support frebsd/arm64.
//
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// 2022-07-26 v1.18.0:
//
// Adds support for Go fs.FS based SQLite virtual filesystems, see function New
// in modernc.org/sqlite/vfs and/or TestVFS in all_test.go
//
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// 2022-04-24 v1.17.0:
//
// Support windows/arm64.
//
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// 2022-04-04 v1.16.0:
//
// Support scalar application defined functions written in Go.
//
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// https://www.sqlite.org/appfunc.html
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//
// 2022-03-13 v1.15.0:
//
// Support linux/riscv64.
//
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// 2021-11-13 v1.14.0:
//
// Support windows/amd64. This target had previously only experimental status
// because of a now resolved memory leak.
//
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// 2021-09-07 v1.13.0:
//
// Support freebsd/amd64.
//
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// 2021-06-23 v1.11.0:
//
// Upgrade to use sqlite 3.36.0, release notes at https://www.sqlite.org/releaselog/3_36_0.html.
//
// 2021-05-06 v1.10.6:
//
// Fixes a memory corruption issue
// (https://gitlab.com/cznic/sqlite/-/issues/53). Versions since v1.8.6 were
// affected and should be updated to v1.10.6.
//
// 2021-03-14 v1.10.0:
//
// Update to use sqlite 3.35.0, release notes at https://www.sqlite.org/releaselog/3_35_0.html.
//
// 2021-03-11 v1.9.0:
//
// Support darwin/arm64.
//
// 2021-01-08 v1.8.0:
//
// Support darwin/amd64.
//
// 2020-09-13 v1.7.0:
//
// Support linux/arm and linux/arm64.
//
// 2020-09-08 v1.6.0:
//
// Support linux/386.
//
// 2020-09-03 v1.5.0:
//
// This project is now completely CGo-free, including the Tcl tests.
//
// 2020-08-26 v1.4.0:
//
// First stable release for linux/amd64. The database/sql driver and its tests
// are CGo free. Tests of the translated sqlite3.c library still require CGo.
//
// $ make full
//
// ...
//
// SQLite 2020-08-14 13:23:32 fca8dc8b578f215a969cd899336378966156154710873e68b3d9ac5881b0ff3f
// 0 errors out of 928271 tests on 3900x Linux 64-bit little-endian
// WARNING: Multi-threaded tests skipped: Linked against a non-threadsafe Tcl build
// All memory allocations freed - no leaks
// Maximum memory usage: 9156360 bytes
// Current memory usage: 0 bytes
// Number of malloc() : -1 calls
// --- PASS: TestTclTest (1785.04s)
// PASS
// ok modernc.org/sqlite 1785.041s
// $
//
// 2020-07-26 v1.4.0-beta1:
//
// The project has reached beta status while supporting linux/amd64 only at the
// moment. The 'extraquick' Tcl testsuite reports
//
// 630 errors out of 200177 tests on Linux 64-bit little-endian
//
// and some memory leaks
//
// Unfreed memory: 698816 bytes in 322 allocations
//
// 2019-12-28 v1.2.0-alpha.3: Third alpha fixes issue #19.
//
// It also bumps the minor version as the repository was wrongly already tagged
// with v1.1.0 before. Even though the tag was deleted there are proxies that
// cached that tag. Thanks /u/garaktailor for detecting the problem and
// suggesting this solution.
//
// 2019-12-26 v1.1.0-alpha.2: Second alpha release adds support for accessing a
// database concurrently by multiple goroutines and/or processes. v1.1.0 is now
// considered feature-complete. Next planed release should be a beta with a
// proper test suite.
//
// 2019-12-18 v1.1.0-alpha.1: First alpha release using the new cc/v3, gocc,
// qbe toolchain. Some primitive tests pass on linux_{amd64,386}. Not yet safe
// for concurrent access by multiple goroutines. Next alpha release is planed
// to arrive before the end of this year.
//
// 2017-06-10 Windows/Intel no more uses the VM (thanks Steffen Butzer).
//
// 2017-06-05 Linux/Intel no more uses the VM (cznic/virtual).
//
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// # Connecting to a database
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//
// To access a Sqlite database do something like
//
// import (
// "database/sql"
//
// _ "modernc.org/sqlite"
// )
//
// ...
//
//
// db, err := sql.Open("sqlite", dsnURI)
//
// ...
//
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// # Debug and development versions
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//
// A comma separated list of options can be passed to `go generate` via the
// environment variable GO_GENERATE. Some useful options include for example:
//
// -DSQLITE_DEBUG
// -DSQLITE_MEM_DEBUG
// -ccgo-verify-structs
//
// To create a debug/development version, issue for example:
//
// $ GO_GENERATE=-DSQLITE_DEBUG,-DSQLITE_MEM_DEBUG go generate
//
// Note: To run `go generate` you need to have modernc.org/ccgo/v3 installed.
//
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// # Hacking
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//
// This is an example of how to use the debug logs in modernc.org/libc when hunting a bug.
//
// 0:jnml@e5-1650:~/src/modernc.org/sqlite$ git status
// On branch master
// Your branch is up to date with 'origin/master'.
//
// nothing to commit, working tree clean
// 0:jnml@e5-1650:~/src/modernc.org/sqlite$ git log -1
// commit df33b8d15107f3cc777799c0fe105f74ef499e62 (HEAD -> master, tag: v1.21.1, origin/master, origin/HEAD, wips, ok)
// Author: Jan Mercl <0xjnml@gmail.com>
// Date: Mon Mar 27 16:18:28 2023 +0200
//
// upgrade to SQLite 3.41.2
// 0:jnml@e5-1650:~/src/modernc.org/sqlite$ rm -f /tmp/libc.log ; go test -v -tags=libc.dmesg -run TestScalar ; ls -l /tmp/libc.log
// test binary compiled for linux/amd64
// === RUN TestScalar
// --- PASS: TestScalar (0.09s)
// PASS
// ok modernc.org/sqlite 0.128s
// -rw-r--r-- 1 jnml jnml 76 Apr 6 11:22 /tmp/libc.log
// 0:jnml@e5-1650:~/src/modernc.org/sqlite$ cat /tmp/libc.log
// [10723 sqlite.test] 2023-04-06 11:22:48.288066057 +0200 CEST m=+0.000707150
// 0:jnml@e5-1650:~/src/modernc.org/sqlite$
//
// The /tmp/libc.log file is created as requested. No useful messages there because none are enabled in libc. Let's try to enable Xwrite as an example.
//
// 0:jnml@e5-1650:~/src/modernc.org/libc$ git status
// On branch master
// Your branch is up to date with 'origin/master'.
//
// Changes not staged for commit:
// (use "git add <file>..." to update what will be committed)
// (use "git restore <file>..." to discard changes in working directory)
// modified: libc_linux.go
//
// no changes added to commit (use "git add" and/or "git commit -a")
// 0:jnml@e5-1650:~/src/modernc.org/libc$ git log -1
// commit 1e22c18cf2de8aa86d5b19b165f354f99c70479c (HEAD -> master, tag: v1.22.3, origin/master, origin/HEAD)
// Author: Jan Mercl <0xjnml@gmail.com>
// Date: Wed Feb 22 20:27:45 2023 +0100
//
// support sqlite 3.41 on linux targets
// 0:jnml@e5-1650:~/src/modernc.org/libc$ git diff
// diff --git a/libc_linux.go b/libc_linux.go
// index 1c2f482..ac1f08d 100644
// --- a/libc_linux.go
// +++ b/libc_linux.go
// @@ -332,19 +332,19 @@ func Xwrite(t *TLS, fd int32, buf uintptr, count types.Size_t) types.Ssize_t {
// var n uintptr
// switch n, _, err = unix.Syscall(unix.SYS_WRITE, uintptr(fd), buf, uintptr(count)); err {
// case 0:
// - // if dmesgs {
// - // // dmesg("%v: %d %#x: %#x\n%s", origin(1), fd, count, n, hex.Dump(GoBytes(buf, int(n))))
// - // dmesg("%v: %d %#x: %#x", origin(1), fd, count, n)
// - // }
// + if dmesgs {
// + // dmesg("%v: %d %#x: %#x\n%s", origin(1), fd, count, n, hex.Dump(GoBytes(buf, int(n))))
// + dmesg("%v: %d %#x: %#x", origin(1), fd, count, n)
// + }
// return types.Ssize_t(n)
// case errno.EAGAIN:
// // nop
// }
// }
//
// - // if dmesgs {
// - // dmesg("%v: fd %v, count %#x: %v", origin(1), fd, count, err)
// - // }
// + if dmesgs {
// + dmesg("%v: fd %v, count %#x: %v", origin(1), fd, count, err)
// + }
// t.setErrno(err)
// return -1
// }
// 0:jnml@e5-1650:~/src/modernc.org/libc$
//
// We need to tell the Go build system to use our local, patched/debug libc:
//
// 0:jnml@e5-1650:~/src/modernc.org/sqlite$ go work use $(go env GOPATH)/src/modernc.org/libc
// 0:jnml@e5-1650:~/src/modernc.org/sqlite$ go work use .
//
// And run the test again:
//
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// 0:jnml@e5-1650:~/src/modernc.org/sqlite$ rm -f /tmp/libc.log ; go test -v -tags=libc.dmesg -run TestScalar ; ls -l /tmp/libc.log
// test binary compiled for linux/amd64
// === RUN TestScalar
// --- PASS: TestScalar (0.26s)
// PASS
// ok modernc.org/sqlite 0.285s
// -rw-r--r-- 1 jnml jnml 918 Apr 6 11:29 /tmp/libc.log
// 0:jnml@e5-1650:~/src/modernc.org/sqlite$ cat /tmp/libc.log
// [11910 sqlite.test] 2023-04-06 11:29:13.143589542 +0200 CEST m=+0.000689270
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0x200: 0x200
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0xc: 0xc
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 7 0x1000: 0x1000
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 7 0x1000: 0x1000
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0x200: 0x200
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0x4: 0x4
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0x1000: 0x1000
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0x4: 0x4
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0x4: 0x4
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0x1000: 0x1000
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0x4: 0x4
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 8 0xc: 0xc
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 7 0x1000: 0x1000
// [11910 sqlite.test] libc_linux.go:337:Xwrite: 7 0x1000: 0x1000
// 0:jnml@e5-1650:~/src/modernc.org/sqlite$
//
// # Sqlite documentation
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//
// See https://sqlite.org/docs.html
package sqlite // import "modernc.org/sqlite"
