sqlite

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Published: May 17, 2024 License: BSD-3-Clause Imports: 21 Imported by: 1,088

README

sqlite

Package sqlite is a cgo-free port of SQLite. Although you could see mattn's driver (github.com/mattn/go-sqlite3) in go.mod file, we import it for tests only.

SQLite is an in-process implementation of a self-contained, serverless, zero-configuration, transactional SQL database engine.

Thanks

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.

Installation

$ go get modernc.org/sqlite

Documentation

pkg.go.dev/modernc.org/sqlite

Builders

modern-c.appspot.com/-/builder/?importpath=modernc.org%2fsqlite

Speedtest1

Numbers for the pure Go version were produced by

 ~/src/modernc.org/sqlite/speedtest1$ go build && ./speedtest1

Numbers for the pure C version were produced by

 ~/src/modernc.org/sqlite/testdata/sqlite-src-3410200/test$ gcc speedtest1.c ../../sqlite-amalgamation-3410200/sqlite3.c -lpthread -ldl && ./a.out

The results are from Go version 1.20.4 and GCC version 10.2.1 on a Linux/amd64 machine, CPU: AMD Ryzen 9 3900X 12-Core Processor × 24, 128GB RAM. Shown are the best of 3 runs.

 Go											C

 -- Speedtest1 for SQLite 3.41.2 2023-03-22 11:56:21 0d1fc92f94cb6b76bffe3ec34d69	-- Speedtest1 for SQLite 3.41.2 2023-03-22 11:56:21 0d1fc92f94cb6b76bffe3ec34d69
  100 - 50000 INSERTs into table with no index......................    0.071s            100 - 50000 INSERTs into table with no index......................    0.077s
  110 - 50000 ordered INSERTS with one index/PK.....................    0.114s            110 - 50000 ordered INSERTS with one index/PK.....................    0.082s
  120 - 50000 unordered INSERTS with one index/PK...................    0.137s            120 - 50000 unordered INSERTS with one index/PK...................    0.099s
  130 - 25 SELECTS, numeric BETWEEN, unindexed......................    0.083s            130 - 25 SELECTS, numeric BETWEEN, unindexed......................    0.091s
  140 - 10 SELECTS, LIKE, unindexed.................................    0.210s            140 - 10 SELECTS, LIKE, unindexed.................................    0.120s
  142 - 10 SELECTS w/ORDER BY, unindexed............................    0.276s            142 - 10 SELECTS w/ORDER BY, unindexed............................    0.182s
  145 - 10 SELECTS w/ORDER BY and LIMIT, unindexed..................    0.183s            145 - 10 SELECTS w/ORDER BY and LIMIT, unindexed..................    0.099s
  150 - CREATE INDEX five times.....................................    0.172s            150 - CREATE INDEX five times.....................................    0.127s
  160 - 10000 SELECTS, numeric BETWEEN, indexed.....................    0.080s            160 - 10000 SELECTS, numeric BETWEEN, indexed.....................    0.078s
  161 - 10000 SELECTS, numeric BETWEEN, PK..........................    0.080s            161 - 10000 SELECTS, numeric BETWEEN, PK..........................    0.078s
  170 - 10000 SELECTS, text BETWEEN, indexed........................    0.187s            170 - 10000 SELECTS, text BETWEEN, indexed........................    0.169s
  180 - 50000 INSERTS with three indexes............................    0.196s            180 - 50000 INSERTS with three indexes............................    0.154s
  190 - DELETE and REFILL one table.................................    0.200s            190 - DELETE and REFILL one table.................................    0.155s
  200 - VACUUM......................................................    0.180s            200 - VACUUM......................................................    0.142s
  210 - ALTER TABLE ADD COLUMN, and query...........................    0.004s            210 - ALTER TABLE ADD COLUMN, and query...........................    0.005s
  230 - 10000 UPDATES, numeric BETWEEN, indexed.....................    0.093s            230 - 10000 UPDATES, numeric BETWEEN, indexed.....................    0.080s
  240 - 50000 UPDATES of individual rows............................    0.153s            240 - 50000 UPDATES of individual rows............................    0.137s
  250 - One big UPDATE of the whole 50000-row table.................    0.024s            250 - One big UPDATE of the whole 50000-row table.................    0.019s
  260 - Query added column after filling............................    0.004s            260 - Query added column after filling............................    0.005s
  270 - 10000 DELETEs, numeric BETWEEN, indexed.....................    0.278s            270 - 10000 DELETEs, numeric BETWEEN, indexed.....................    0.263s
  280 - 50000 DELETEs of individual rows............................    0.188s            280 - 50000 DELETEs of individual rows............................    0.180s
  290 - Refill two 50000-row tables using REPLACE...................    0.411s            290 - Refill two 50000-row tables using REPLACE...................    0.359s
  300 - Refill a 50000-row table using (b&1)==(a&1).................    0.175s            300 - Refill a 50000-row table using (b&1)==(a&1).................    0.151s
  310 - 10000 four-ways joins.......................................    0.427s            310 - 10000 four-ways joins.......................................    0.365s
  320 - subquery in result set......................................    0.440s            320 - subquery in result set......................................    0.521s
  400 - 70000 REPLACE ops on an IPK.................................    0.125s            400 - 70000 REPLACE ops on an IPK.................................    0.106s
  410 - 70000 SELECTS on an IPK.....................................    0.081s            410 - 70000 SELECTS on an IPK.....................................    0.078s
  500 - 70000 REPLACE on TEXT PK....................................    0.174s            500 - 70000 REPLACE on TEXT PK....................................    0.116s
  510 - 70000 SELECTS on a TEXT PK..................................    0.153s            510 - 70000 SELECTS on a TEXT PK..................................    0.117s
  520 - 70000 SELECT DISTINCT.......................................    0.083s            520 - 70000 SELECT DISTINCT.......................................    0.067s
  980 - PRAGMA integrity_check......................................    0.436s            980 - PRAGMA integrity_check......................................    0.377s
  990 - ANALYZE.....................................................    0.107s            990 - ANALYZE.....................................................    0.038s
        TOTAL.......................................................    5.525s                  TOTAL.......................................................    4.637s

This particular test executes 16.1% faster in the C version.

Troubleshooting

  • Q: How can I write to a database concurrently without getting the database is locked error (or SQLITE_BUSY)?
    • A: You can't. The C sqlite implementation does not allow concurrent writes, and this libary does not modify that behaviour. You can, however, use DB.SetMaxOpenConns(1) so that only 1 connection is ever used by the DB, allowing concurrent access to DB without making the writes concurrent. More information on issues #65 and #106.

Documentation

Overview

Package sqlite is a sql/database driver using a CGo-free port of the C SQLite3 library.

SQLite is an in-process implementation of a self-contained, serverless, zero-configuration, transactional SQL database engine.

Thanks

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.

Supported platforms and architectures

These combinations of GOOS and GOARCH are currently supported

OS      Arch    SQLite version
------------------------------
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

Builders

Builder results available at:

https://modern-c.appspot.com/-/builder/?importpath=modernc.org%2fsqlite

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.

Changelog

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:

(*Driver).RegisterConnectionHook: added
ConnectionHookFn: added
ExecQuerierContext: added
RegisterConnectionHook: added

2023-08-03 v1.25.0: enable SQLITE_ENABLE_DBSTAT_VTAB.

2023-07-11 v1.24.0:

Add (*conn).{Serialize,Deserialize,NewBackup,NewRestore} methods, add Backup type.

2023-06-01 v1.23.0:

Allow registering aggregate functions.

2023-04-22 v1.22.0:

Support linux/s390x.

2023-02-23 v1.21.0:

Upgrade to SQLite 3.41.0, release notes at https://sqlite.org/releaselog/3_41_0.html.

2022-11-28 v1.20.0

Support linux/ppc64le.

2022-09-16 v1.19.0:

Support frebsd/arm64.

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

2022-04-24 v1.17.0:

Support windows/arm64.

2022-04-04 v1.16.0:

Support scalar application defined functions written in Go.

https://www.sqlite.org/appfunc.html

2022-03-13 v1.15.0:

Support linux/riscv64.

2021-11-13 v1.14.0:

Support windows/amd64. This target had previously only experimental status because of a now resolved memory leak.

2021-09-07 v1.13.0:

Support freebsd/amd64.

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).

Connecting to a database

To access a Sqlite database do something like

import (
	"database/sql"

	_ "modernc.org/sqlite"
)

...

db, err := sql.Open("sqlite", dsnURI)

...

Debug and development versions

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.

Hacking

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:

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

See https://sqlite.org/docs.html

Index

Constants

This section is empty.

Variables

View Source
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)",
	}
)

Functions

func Limit added in v1.23.1

func Limit(c *sql.Conn, id int, newVal int) (r int, err error)

Limit calls sqlite3_limit, see the docs at https://www.sqlite.org/c3ref/limit.html for details.

To get a sql.Conn from a *sql.DB, use (*sql.DB).Conn(). Limits are bound to the particular instance of 'c', so getting a new connection only to pass it to Limit is possibly not useful above querying what are the various configured default values.

func MustRegisterCollationUtf8 added in v1.26.0

func MustRegisterCollationUtf8(
	zName string,
	impl func(left, right string) int,
)

MustRegisterCollationUtf8 is like RegisterCollationUtf8 but panics on error.

func MustRegisterDeterministicScalarFunction added in v1.16.0

func MustRegisterDeterministicScalarFunction(
	zFuncName string,
	nArg int32,
	xFunc func(ctx *FunctionContext, args []driver.Value) (driver.Value, error),
)

MustRegisterDeterministicScalarFunction is like RegisterDeterministicScalarFunction but panics on error.

func MustRegisterFunction added in v1.23.0

func MustRegisterFunction(
	zFuncName string,
	impl *FunctionImpl,
)

MustRegisterFunction is like RegisterFunction but panics on error.

func MustRegisterScalarFunction added in v1.16.0

func MustRegisterScalarFunction(
	zFuncName string,
	nArg int32,
	xFunc func(ctx *FunctionContext, args []driver.Value) (driver.Value, error),
)

MustRegisterScalarFunction is like RegisterScalarFunction but panics on error.

func RegisterCollationUtf8 added in v1.26.0

func RegisterCollationUtf8(
	zName string,
	impl func(left, right string) int,
) error

RegisterCollationUtf8 makes a Go function available as a collation named zName. impl receives two UTF-8 strings: left and right. The result needs to be:

- 0 if left == right - 1 if left < right - +1 if left > right

impl must always return the same result given the same inputs. Additionally, it must have the following properties for all strings A, B and C: - if A==B, then B==A - if A==B and B==C, then A==C - if A<B, then B>A - if A<B and B<C, then A<C.

The new collation will be available to all new connections opened after executing RegisterCollationUtf8.

func RegisterConnectionHook added in v1.28.0

func RegisterConnectionHook(fn ConnectionHookFn)

RegisterConnectionHook registers a function to be called after each connection is opened. This is called after all the connection has been set up.

func RegisterDeterministicScalarFunction added in v1.16.0

func RegisterDeterministicScalarFunction(
	zFuncName string,
	nArg int32,
	xFunc func(ctx *FunctionContext, args []driver.Value) (driver.Value, error),
) (err error)

RegisterDeterministicScalarFunction registers a deterministic scalar function named zFuncName with nArg arguments. Passing -1 for nArg indicates the function is variadic. A deterministic function means that the function always gives the same output when the input parameters are the same.

The new function will be available to all new connections opened after executing RegisterDeterministicScalarFunction.

func RegisterFunction added in v1.23.0

func RegisterFunction(
	zFuncName string,
	impl *FunctionImpl,
) error

RegisterFunction registers a function named zFuncName with nArg arguments. Passing -1 for nArg indicates the function is variadic. The FunctionImpl determines whether the function is deterministic or not, and whether it is a scalar function (when Scalar is defined) or an aggregate function (when Scalar is not defined and MakeAggregate is defined).

The new function will be available to all new connections opened after executing RegisterFunction.

func RegisterScalarFunction added in v1.16.0

func RegisterScalarFunction(
	zFuncName string,
	nArg int32,
	xFunc func(ctx *FunctionContext, args []driver.Value) (driver.Value, error),
) (err error)

RegisterScalarFunction registers a scalar function named zFuncName with nArg arguments. Passing -1 for nArg indicates the function is variadic.

The new function will be available to all new connections opened after executing RegisterScalarFunction.

Types

type AggregateFunction added in v1.23.0

type AggregateFunction interface {
	// Step is called for each row of an aggregate function's SQL
	// invocation. The argument Values are not valid past the return of the
	// function.
	Step(ctx *FunctionContext, rowArgs []driver.Value) error

	// WindowInverse is called to remove the oldest presently aggregated
	// result of Step from the current window. The arguments are those
	// passed to Step for the row being removed. The argument Values are not
	// valid past the return of the function.
	WindowInverse(ctx *FunctionContext, rowArgs []driver.Value) error

	// WindowValue is called to get the current value of an aggregate
	// function. This is used to return the final value of the function,
	// whether it is used as a window function or not.
	WindowValue(ctx *FunctionContext) (driver.Value, error)

	// Final is called after all of the aggregate function's input rows have
	// been stepped through. No other methods will be called on the
	// AggregateFunction after calling Final. WindowValue returns the value
	// from the function.
	Final(ctx *FunctionContext)
}

An AggregateFunction is an invocation of an aggregate or window function. See the documentation for aggregate function callbacks and application-defined window functions for an overview.

type Backup added in v1.24.0

type Backup struct {
	// contains filtered or unexported fields
}

Backup object is used to manage progress and cleanup an online backup. It is returned by NewBackup or NewRestore.

func (*Backup) Commit added in v1.29.6

func (b *Backup) Commit() (driver.Conn, error)

Commit releases all resources associated with the Backup object but does not close the destination database connection.

The destination database connection is returned to the caller or an error if raised. It is the responsibility of the caller to handle the connection closure.

func (*Backup) Finish added in v1.24.0

func (b *Backup) Finish() error

Finish releases all resources associated with the Backup object. The Backup object is invalid and may not be used following a call to Finish.

func (*Backup) Step added in v1.24.0

func (b *Backup) Step(n int32) (bool, error)

Step will copy up to n pages between the source and destination databases specified by the backup object. If n is negative, all remaining source pages are copied. If it successfully copies n pages and there are still more pages to be copied, then the function returns true with no error. If it successfully finishes copying all pages from source to destination, then it returns false with no error. If an error occurs while running, then an error is returned.

type ConnectionHookFn added in v1.28.0

type ConnectionHookFn func(
	conn ExecQuerierContext,
	dsn string,
) error

ConnectionHookFn function type for a connection hook on the Driver. Connection hooks are called after the connection has been set up.

type Driver

type Driver struct {
	// contains filtered or unexported fields
}

Driver implements database/sql/driver.Driver.

func (*Driver) Open

func (d *Driver) Open(name string) (conn driver.Conn, err error)

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.

The name may be a filename, e.g., "/tmp/mydata.sqlite", or a URI, in which case it may include a '?' followed by one or more query parameters. For example, "file:///tmp/mydata.sqlite?_pragma=foreign_keys(1)&_time_format=sqlite". The supported query parameters are:

_pragma: Each value will be run as a "PRAGMA ..." statement (with the PRAGMA keyword added for you). May be specified more than once, '&'-separated. For more information on supported PRAGMAs see: https://www.sqlite.org/pragma.html

_time_format: The name of a format to use when writing time values to the database. Currently the only supported value is "sqlite", which corresponds to format 7 from https://www.sqlite.org/lang_datefunc.html#time_values, including the timezone specifier. If this parameter is not specified, then the default String() format will be used.

_txlock: The locking behavior to use when beginning a transaction. May be "deferred" (the default), "immediate", or "exclusive" (case insensitive). See: https://www.sqlite.org/lang_transaction.html#deferred_immediate_and_exclusive_transactions

func (*Driver) RegisterConnectionHook added in v1.28.0

func (d *Driver) RegisterConnectionHook(fn ConnectionHookFn)

RegisterConnectionHook registers a function to be called after each connection is opened. This is called after all the connection has been set up.

type Error added in v1.3.0

type Error struct {
	// contains filtered or unexported fields
}

Error represents sqlite library error code.

func (*Error) Code added in v1.3.0

func (e *Error) Code() int

Code returns the sqlite result code for this error.

func (*Error) Error added in v1.3.0

func (e *Error) Error() string

Error implements error.

type ExecQuerierContext added in v1.28.0

type ExecQuerierContext interface {
	driver.ExecerContext
	driver.QueryerContext
}

type FunctionContext added in v1.16.0

type FunctionContext struct {
	// contains filtered or unexported fields
}

FunctionContext represents the context user defined functions execute in. Fields and/or methods of this type may get addedd in the future.

type FunctionImpl added in v1.23.0

type FunctionImpl struct {
	// NArgs is the required number of arguments that the function accepts.
	// If NArgs is negative, then the function is variadic.
	NArgs int32

	// If Deterministic is true, the function must always give the same
	// output when the input parameters are the same. This enables functions
	// to be used in additional contexts like the WHERE clause of partial
	// indexes and enables additional optimizations.
	//
	// See https://sqlite.org/c3ref/c_deterministic.html#sqlitedeterministic
	// for more details.
	Deterministic bool

	// Scalar is called when a scalar function is invoked in SQL. The
	// argument Values are not valid past the return of the function.
	Scalar func(ctx *FunctionContext, args []driver.Value) (driver.Value, error)

	// MakeAggregate is called at the beginning of each evaluation of an
	// aggregate function.
	MakeAggregate func(ctx FunctionContext) (AggregateFunction, error)
}

FunctionImpl describes an application-defined SQL function. If Scalar is set, it is treated as a scalar function; otherwise, it is treated as an aggregate function using MakeAggregate.

Directories

Path Synopsis
benchmark module
examples

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