sqlite

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Version: v0.3.2 Latest Latest
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Published: Jun 7, 2020 License: ISC Imports: 10 Imported by: 59

README

Go interface to SQLite.

GoDoc Build Status (linux and macOS) Build status (windows)

This package provides a low-level Go interface to SQLite 3. Connections are pooled and if the SQLite shared cache mode is enabled the package takes advantage of the unlock-notify API to minimize the amount of handling user code needs for dealing with database lock contention.

It has interfaces for some of SQLite's more interesting extensions, such as incremental BLOB I/O and the session extension.

A utility package, sqlitex, provides some higher-level tools for making it easier to perform common tasks with SQLite. In particular it provides support to make nested transactions easy to use via sqlitex.Save.

This is not a database/sql driver.

go get -u crawshaw.io/sqlite

Example

A HTTP handler that uses a multi-threaded pool of SQLite connections via a shared cache.

var dbpool *sqlitex.Pool

func main() {
	var err error
	dbpool, err = sqlitex.Open("file:memory:?mode=memory", 0, 10)
	if err != nil {
		log.Fatal(err)
	}
	http.HandleFunc("/", handler)
	log.Fatal(http.ListenAndServe(":8080", nil))
}

func handler(w http.ResponseWriter, r *http.Request) {
	conn := dbpool.Get(r.Context())
	if conn == nil {
		return
	}
	defer dbpool.Put(conn)
	stmt := conn.Prep("SELECT foo FROM footable WHERE id = $id;")
	stmt.SetText("$id", "_user_id_")
	for {
		if hasRow, err := stmt.Step(); err != nil {
			// ... handle error
		} else if !hasRow {
			break
		}
		foo := stmt.GetText("foo")
		// ... use foo
	}
}

https://godoc.org/crawshaw.io/sqlite

Documentation

Overview

Package sqlite provides a Go interface to SQLite 3.

The semantics of this package are deliberately close to the SQLite3 C API, so it is helpful to be familiar with http://www.sqlite.org/c3ref/intro.html.

An SQLite connection is represented by a *sqlite.Conn. Connections cannot be used concurrently. A typical Go program will create a pool of connections (using Open to create a *sqlitex.Pool) so goroutines can borrow a connection while they need to talk to the database.

This package assumes SQLite will be used concurrently by the process through several connections, so the build options for SQLite enable multi-threading and the shared cache: https://www.sqlite.org/sharedcache.html

The implementation automatically handles shared cache locking, see the documentation on Stmt.Step for details.

The optional SQLite3 compiled in are: FTS5, RTree, JSON1, Session, GeoPoly

This is not a database/sql driver.

Statement Caching

Statements are prepared with the Prepare and PrepareTransient methods. When using Prepare, statements are keyed inside a connection by the original query string used to create them. This means long-running high-performance code paths can write:

stmt, err := conn.Prepare("SELECT ...")

After all the connections in a pool have been warmed up by passing through one of these Prepare calls, subsequent calls are simply a map lookup that returns an existing statement.

Streaming Blobs

The sqlite package supports the SQLite incremental I/O interface for streaming blob data into and out of the the database without loading the entire blob into a single []byte. (This is important when working either with very large blobs, or more commonly, a large number of moderate-sized blobs concurrently.)

To write a blob, first use an INSERT statement to set the size of the blob and assign a rowid:

"INSERT INTO blobs (myblob) VALUES (?);"

Use BindZeroBlob or SetZeroBlob to set the size of myblob. Then you can open the blob with:

b, err := conn.OpenBlob("", "blobs", "myblob", conn.LastInsertRowID(), true)

Deadlines and Cancellation

Every connection can have a done channel associated with it using the SetInterrupt method. This is typically the channel returned by a context.Context Done method.

For example, a timeout can be associated with a connection session:

ctx := context.WithTimeout(context.Background(), 100*time.Millisecond)
conn.SetInterrupt(ctx.Done())

As database connections are long-lived, the SetInterrupt method can be called multiple times to reset the associated lifetime.

When using pools, the shorthand for associating a context with a connection is:

conn := dbpool.Get(ctx)
if conn == nil {
	// ... handle error
}
defer dbpool.Put(c)

Transactions

SQLite transactions have to be managed manually with this package by directly calling BEGIN / COMMIT / ROLLBACK or SAVEPOINT / RELEASE/ ROLLBACK. The sqlitex has a Savepoint function that helps automate this.

A typical HTTP Handler

Using a Pool to execute SQL in a concurrent HTTP handler.

var dbpool *sqlitex.Pool

func main() {
	var err error
	dbpool, err = sqlitex.Open("file:memory:?mode=memory", 0, 10)
	if err != nil {
		log.Fatal(err)
	}
	http.HandleFunc("/", handle)
	log.Fatal(http.ListenAndServe(":8080", nil))
}

func handle(w http.ResponseWriter, r *http.Request) {
	conn := dbpool.Get(r.Context())
	if conn == nil {
		return
	}
	defer dbpool.Put(conn)
	stmt := conn.Prep("SELECT foo FROM footable WHERE id = $id;")
	stmt.SetText("$id", "_user_id_")
	for {
		if hasRow, err := stmt.Step(); err != nil {
			// ... handle error
		} else if !hasRow {
			break
		}
		foo := stmt.GetText("foo")
		// ... use foo
	}
}

For helper functions that make some kinds of statements easier to write see the sqlitex package.

Index

Constants

View Source
const (
	// Cause the entire SQL statement to be rejected with an error.
	SQLITE_DENY = AuthResult(C.SQLITE_DENY)
	// Disallow the specific action but allow the SQL statement to continue to
	// be compiled.
	SQLITE_IGNORE = AuthResult(C.SQLITE_IGNORE)
)

Possible return values of an Authorizer.

View Source
const (
	SQLITE_OK         = ErrorCode(C.SQLITE_OK) // do not use in Error
	SQLITE_ERROR      = ErrorCode(C.SQLITE_ERROR)
	SQLITE_INTERNAL   = ErrorCode(C.SQLITE_INTERNAL)
	SQLITE_PERM       = ErrorCode(C.SQLITE_PERM)
	SQLITE_ABORT      = ErrorCode(C.SQLITE_ABORT)
	SQLITE_BUSY       = ErrorCode(C.SQLITE_BUSY)
	SQLITE_LOCKED     = ErrorCode(C.SQLITE_LOCKED)
	SQLITE_NOMEM      = ErrorCode(C.SQLITE_NOMEM)
	SQLITE_READONLY   = ErrorCode(C.SQLITE_READONLY)
	SQLITE_INTERRUPT  = ErrorCode(C.SQLITE_INTERRUPT)
	SQLITE_IOERR      = ErrorCode(C.SQLITE_IOERR)
	SQLITE_CORRUPT    = ErrorCode(C.SQLITE_CORRUPT)
	SQLITE_NOTFOUND   = ErrorCode(C.SQLITE_NOTFOUND)
	SQLITE_FULL       = ErrorCode(C.SQLITE_FULL)
	SQLITE_CANTOPEN   = ErrorCode(C.SQLITE_CANTOPEN)
	SQLITE_PROTOCOL   = ErrorCode(C.SQLITE_PROTOCOL)
	SQLITE_EMPTY      = ErrorCode(C.SQLITE_EMPTY)
	SQLITE_SCHEMA     = ErrorCode(C.SQLITE_SCHEMA)
	SQLITE_TOOBIG     = ErrorCode(C.SQLITE_TOOBIG)
	SQLITE_CONSTRAINT = ErrorCode(C.SQLITE_CONSTRAINT)
	SQLITE_MISMATCH   = ErrorCode(C.SQLITE_MISMATCH)
	SQLITE_MISUSE     = ErrorCode(C.SQLITE_MISUSE)
	SQLITE_NOLFS      = ErrorCode(C.SQLITE_NOLFS)
	SQLITE_AUTH       = ErrorCode(C.SQLITE_AUTH)
	SQLITE_FORMAT     = ErrorCode(C.SQLITE_FORMAT)
	SQLITE_RANGE      = ErrorCode(C.SQLITE_RANGE)
	SQLITE_NOTADB     = ErrorCode(C.SQLITE_NOTADB)
	SQLITE_NOTICE     = ErrorCode(C.SQLITE_NOTICE)
	SQLITE_WARNING    = ErrorCode(C.SQLITE_WARNING)
	SQLITE_ROW        = ErrorCode(C.SQLITE_ROW)  // do not use in Error
	SQLITE_DONE       = ErrorCode(C.SQLITE_DONE) // do not use in Error

	SQLITE_ERROR_MISSING_COLLSEQ   = ErrorCode(C.SQLITE_ERROR_MISSING_COLLSEQ)
	SQLITE_ERROR_RETRY             = ErrorCode(C.SQLITE_ERROR_RETRY)
	SQLITE_ERROR_SNAPSHOT          = ErrorCode(C.SQLITE_ERROR_SNAPSHOT)
	SQLITE_IOERR_READ              = ErrorCode(C.SQLITE_IOERR_READ)
	SQLITE_IOERR_SHORT_READ        = ErrorCode(C.SQLITE_IOERR_SHORT_READ)
	SQLITE_IOERR_WRITE             = ErrorCode(C.SQLITE_IOERR_WRITE)
	SQLITE_IOERR_FSYNC             = ErrorCode(C.SQLITE_IOERR_FSYNC)
	SQLITE_IOERR_DIR_FSYNC         = ErrorCode(C.SQLITE_IOERR_DIR_FSYNC)
	SQLITE_IOERR_TRUNCATE          = ErrorCode(C.SQLITE_IOERR_TRUNCATE)
	SQLITE_IOERR_FSTAT             = ErrorCode(C.SQLITE_IOERR_FSTAT)
	SQLITE_IOERR_UNLOCK            = ErrorCode(C.SQLITE_IOERR_UNLOCK)
	SQLITE_IOERR_RDLOCK            = ErrorCode(C.SQLITE_IOERR_RDLOCK)
	SQLITE_IOERR_DELETE            = ErrorCode(C.SQLITE_IOERR_DELETE)
	SQLITE_IOERR_BLOCKED           = ErrorCode(C.SQLITE_IOERR_BLOCKED)
	SQLITE_IOERR_NOMEM             = ErrorCode(C.SQLITE_IOERR_NOMEM)
	SQLITE_IOERR_ACCESS            = ErrorCode(C.SQLITE_IOERR_ACCESS)
	SQLITE_IOERR_CHECKRESERVEDLOCK = ErrorCode(C.SQLITE_IOERR_CHECKRESERVEDLOCK)
	SQLITE_IOERR_LOCK              = ErrorCode(C.SQLITE_IOERR_LOCK)
	SQLITE_IOERR_CLOSE             = ErrorCode(C.SQLITE_IOERR_CLOSE)
	SQLITE_IOERR_DIR_CLOSE         = ErrorCode(C.SQLITE_IOERR_DIR_CLOSE)
	SQLITE_IOERR_SHMOPEN           = ErrorCode(C.SQLITE_IOERR_SHMOPEN)
	SQLITE_IOERR_SHMSIZE           = ErrorCode(C.SQLITE_IOERR_SHMSIZE)
	SQLITE_IOERR_SHMLOCK           = ErrorCode(C.SQLITE_IOERR_SHMLOCK)
	SQLITE_IOERR_SHMMAP            = ErrorCode(C.SQLITE_IOERR_SHMMAP)
	SQLITE_IOERR_SEEK              = ErrorCode(C.SQLITE_IOERR_SEEK)
	SQLITE_IOERR_DELETE_NOENT      = ErrorCode(C.SQLITE_IOERR_DELETE_NOENT)
	SQLITE_IOERR_MMAP              = ErrorCode(C.SQLITE_IOERR_MMAP)
	SQLITE_IOERR_GETTEMPPATH       = ErrorCode(C.SQLITE_IOERR_GETTEMPPATH)
	SQLITE_IOERR_CONVPATH          = ErrorCode(C.SQLITE_IOERR_CONVPATH)
	SQLITE_IOERR_VNODE             = ErrorCode(C.SQLITE_IOERR_VNODE)
	SQLITE_IOERR_AUTH              = ErrorCode(C.SQLITE_IOERR_AUTH)
	SQLITE_IOERR_BEGIN_ATOMIC      = ErrorCode(C.SQLITE_IOERR_BEGIN_ATOMIC)
	SQLITE_IOERR_COMMIT_ATOMIC     = ErrorCode(C.SQLITE_IOERR_COMMIT_ATOMIC)
	SQLITE_IOERR_ROLLBACK_ATOMIC   = ErrorCode(C.SQLITE_IOERR_ROLLBACK_ATOMIC)
	SQLITE_LOCKED_SHAREDCACHE      = ErrorCode(C.SQLITE_LOCKED_SHAREDCACHE)
	SQLITE_BUSY_RECOVERY           = ErrorCode(C.SQLITE_BUSY_RECOVERY)
	SQLITE_BUSY_SNAPSHOT           = ErrorCode(C.SQLITE_BUSY_SNAPSHOT)
	SQLITE_CANTOPEN_NOTEMPDIR      = ErrorCode(C.SQLITE_CANTOPEN_NOTEMPDIR)
	SQLITE_CANTOPEN_ISDIR          = ErrorCode(C.SQLITE_CANTOPEN_ISDIR)
	SQLITE_CANTOPEN_FULLPATH       = ErrorCode(C.SQLITE_CANTOPEN_FULLPATH)
	SQLITE_CANTOPEN_CONVPATH       = ErrorCode(C.SQLITE_CANTOPEN_CONVPATH)
	SQLITE_CORRUPT_VTAB            = ErrorCode(C.SQLITE_CORRUPT_VTAB)
	SQLITE_READONLY_RECOVERY       = ErrorCode(C.SQLITE_READONLY_RECOVERY)
	SQLITE_READONLY_CANTLOCK       = ErrorCode(C.SQLITE_READONLY_CANTLOCK)
	SQLITE_READONLY_ROLLBACK       = ErrorCode(C.SQLITE_READONLY_ROLLBACK)
	SQLITE_READONLY_DBMOVED        = ErrorCode(C.SQLITE_READONLY_DBMOVED)
	SQLITE_READONLY_CANTINIT       = ErrorCode(C.SQLITE_READONLY_CANTINIT)
	SQLITE_READONLY_DIRECTORY      = ErrorCode(C.SQLITE_READONLY_DIRECTORY)
	SQLITE_ABORT_ROLLBACK          = ErrorCode(C.SQLITE_ABORT_ROLLBACK)
	SQLITE_CONSTRAINT_CHECK        = ErrorCode(C.SQLITE_CONSTRAINT_CHECK)
	SQLITE_CONSTRAINT_COMMITHOOK   = ErrorCode(C.SQLITE_CONSTRAINT_COMMITHOOK)
	SQLITE_CONSTRAINT_FOREIGNKEY   = ErrorCode(C.SQLITE_CONSTRAINT_FOREIGNKEY)
	SQLITE_CONSTRAINT_FUNCTION     = ErrorCode(C.SQLITE_CONSTRAINT_FUNCTION)
	SQLITE_CONSTRAINT_NOTNULL      = ErrorCode(C.SQLITE_CONSTRAINT_NOTNULL)
	SQLITE_CONSTRAINT_PRIMARYKEY   = ErrorCode(C.SQLITE_CONSTRAINT_PRIMARYKEY)
	SQLITE_CONSTRAINT_TRIGGER      = ErrorCode(C.SQLITE_CONSTRAINT_TRIGGER)
	SQLITE_CONSTRAINT_UNIQUE       = ErrorCode(C.SQLITE_CONSTRAINT_UNIQUE)
	SQLITE_CONSTRAINT_VTAB         = ErrorCode(C.SQLITE_CONSTRAINT_VTAB)
	SQLITE_CONSTRAINT_ROWID        = ErrorCode(C.SQLITE_CONSTRAINT_ROWID)
	SQLITE_NOTICE_RECOVER_WAL      = ErrorCode(C.SQLITE_NOTICE_RECOVER_WAL)
	SQLITE_NOTICE_RECOVER_ROLLBACK = ErrorCode(C.SQLITE_NOTICE_RECOVER_ROLLBACK)
	SQLITE_WARNING_AUTOINDEX       = ErrorCode(C.SQLITE_WARNING_AUTOINDEX)
	SQLITE_AUTH_USER               = ErrorCode(C.SQLITE_AUTH_USER)
)
View Source
const (
	SQLITE_CHANGESET_DATA        = ConflictType(C.SQLITE_CHANGESET_DATA)
	SQLITE_CHANGESET_NOTFOUND    = ConflictType(C.SQLITE_CHANGESET_NOTFOUND)
	SQLITE_CHANGESET_CONFLICT    = ConflictType(C.SQLITE_CHANGESET_CONFLICT)
	SQLITE_CHANGESET_CONSTRAINT  = ConflictType(C.SQLITE_CHANGESET_CONSTRAINT)
	SQLITE_CHANGESET_FOREIGN_KEY = ConflictType(C.SQLITE_CHANGESET_FOREIGN_KEY)
)
View Source
const (
	SQLITE_CHANGESET_OMIT    = ConflictAction(C.SQLITE_CHANGESET_OMIT)
	SQLITE_CHANGESET_ABORT   = ConflictAction(C.SQLITE_CHANGESET_ABORT)
	SQLITE_CHANGESET_REPLACE = ConflictAction(C.SQLITE_CHANGESET_REPLACE)
)
View Source
const (
	SQLITE_OPEN_READONLY       = OpenFlags(C.SQLITE_OPEN_READONLY)
	SQLITE_OPEN_READWRITE      = OpenFlags(C.SQLITE_OPEN_READWRITE)
	SQLITE_OPEN_CREATE         = OpenFlags(C.SQLITE_OPEN_CREATE)
	SQLITE_OPEN_URI            = OpenFlags(C.SQLITE_OPEN_URI)
	SQLITE_OPEN_MEMORY         = OpenFlags(C.SQLITE_OPEN_MEMORY)
	SQLITE_OPEN_MAIN_DB        = OpenFlags(C.SQLITE_OPEN_MAIN_DB)
	SQLITE_OPEN_TEMP_DB        = OpenFlags(C.SQLITE_OPEN_TEMP_DB)
	SQLITE_OPEN_TRANSIENT_DB   = OpenFlags(C.SQLITE_OPEN_TRANSIENT_DB)
	SQLITE_OPEN_MAIN_JOURNAL   = OpenFlags(C.SQLITE_OPEN_MAIN_JOURNAL)
	SQLITE_OPEN_TEMP_JOURNAL   = OpenFlags(C.SQLITE_OPEN_TEMP_JOURNAL)
	SQLITE_OPEN_SUBJOURNAL     = OpenFlags(C.SQLITE_OPEN_SUBJOURNAL)
	SQLITE_OPEN_MASTER_JOURNAL = OpenFlags(C.SQLITE_OPEN_MASTER_JOURNAL)
	SQLITE_OPEN_NOMUTEX        = OpenFlags(C.SQLITE_OPEN_NOMUTEX)
	SQLITE_OPEN_FULLMUTEX      = OpenFlags(C.SQLITE_OPEN_FULLMUTEX)
	SQLITE_OPEN_SHAREDCACHE    = OpenFlags(C.SQLITE_OPEN_SHAREDCACHE)
	SQLITE_OPEN_PRIVATECACHE   = OpenFlags(C.SQLITE_OPEN_PRIVATECACHE)
	SQLITE_OPEN_WAL            = OpenFlags(C.SQLITE_OPEN_WAL)
)
View Source
const (
	SQLITE_DBCONFIG_DQS_DML = C.int(C.SQLITE_DBCONFIG_DQS_DML)
	SQLITE_DBCONFIG_DQS_DDL = C.int(C.SQLITE_DBCONFIG_DQS_DDL)
)
View Source
const (
	SQLITE_INTEGER = ColumnType(C.SQLITE_INTEGER)
	SQLITE_FLOAT   = ColumnType(C.SQLITE_FLOAT)
	SQLITE_TEXT    = ColumnType(C.SQLITE3_TEXT)
	SQLITE_BLOB    = ColumnType(C.SQLITE_BLOB)
	SQLITE_NULL    = ColumnType(C.SQLITE_NULL)
)
View Source
const (
	SQLITE_LIMIT_LENGTH              = Limit(C.SQLITE_LIMIT_LENGTH)
	SQLITE_LIMIT_SQL_LENGTH          = Limit(C.SQLITE_LIMIT_SQL_LENGTH)
	SQLITE_LIMIT_COLUMN              = Limit(C.SQLITE_LIMIT_COLUMN)
	SQLITE_LIMIT_EXPR_DEPTH          = Limit(C.SQLITE_LIMIT_EXPR_DEPTH)
	SQLITE_LIMIT_COMPOUND_SELECT     = Limit(C.SQLITE_LIMIT_COMPOUND_SELECT)
	SQLITE_LIMIT_VDBE_OP             = Limit(C.SQLITE_LIMIT_VDBE_OP)
	SQLITE_LIMIT_FUNCTION_ARG        = Limit(C.SQLITE_LIMIT_FUNCTION_ARG)
	SQLITE_LIMIT_ATTACHED            = Limit(C.SQLITE_LIMIT_ATTACHED)
	SQLITE_LIMIT_LIKE_PATTERN_LENGTH = Limit(C.SQLITE_LIMIT_LIKE_PATTERN_LENGTH)
	SQLITE_LIMIT_VARIABLE_NUMBER     = Limit(C.SQLITE_LIMIT_VARIABLE_NUMBER)
	SQLITE_LIMIT_TRIGGER_DEPTH       = Limit(C.SQLITE_LIMIT_TRIGGER_DEPTH)
	SQLITE_LIMIT_WORKER_THREADS      = Limit(C.SQLITE_LIMIT_WORKER_THREADS)
)

Limit categories.

View Source
const BindIndexStart = 1

BindIndexStart is the index of the first parameter when using the Stmt.Bind* functions.

View Source
const ColumnIndexStart = 0

ColumnIndexStart is the index of the first column when using the Stmt.Column* functions.

View Source
const (
	SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION = C.int(C.SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION)
)

Variables

View Source
var Logger func(code ErrorCode, msg []byte)

Logger is written to by SQLite. The Logger must be set before any connection is opened. The msg slice is only valid for the duration of the call.

It is very noisy.

Functions

func ChangesetConcat

func ChangesetConcat(w io.Writer, r1, r2 io.Reader) error

ChangesetConcat concatenates two changesets.

https://www.sqlite.org/session/sqlite3changeset_concat.html

func ChangesetInvert

func ChangesetInvert(w io.Writer, r io.Reader) error

ChangesetInvert inverts a changeset.

https://www.sqlite.org/session/sqlite3changeset_invert.html

Types

type ActionInfo added in v0.3.1

type ActionInfo struct {
	Action OpType

	Index     string
	Table     string
	Column    string
	Trigger   string
	View      string
	Function  string
	Pragma    string
	PragmaArg string
	Operation string
	Filename  string
	Module    string
	Database  string
	Savepoint string

	InnerMostTrigger string
}

ActionInfo holds information about an action to be authorized.

Only the fields relevant to the Action are populated when this is passed to an Authorizer.

https://sqlite.org/c3ref/c_alter_table.html

func (ActionInfo) String added in v0.3.1

func (a ActionInfo) String() string

String returns a string describing only the fields relevant to `a.Action`.

type AuthResult added in v0.3.1

type AuthResult int

AuthResult is the result of a call to an Authorizer. The zero value is SQLITE_OK.

func (AuthResult) String added in v0.3.1

func (result AuthResult) String() string

String returns the C constant name of the result.

type AuthorizeFunc added in v0.3.1

type AuthorizeFunc func(info ActionInfo) AuthResult

AuthorizeFunc is a function that implements Authorizer.

func (AuthorizeFunc) Authorize added in v0.3.1

func (f AuthorizeFunc) Authorize(info ActionInfo) AuthResult

Authorize calls f.

type Authorizer added in v0.3.1

type Authorizer interface {
	Authorize(info ActionInfo) AuthResult
}

An Authorizer is called during statement preparation to see whether an action is allowed by the application. See https://sqlite.org/c3ref/set_authorizer.html

type Backup added in v0.2.1

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

A Backup copies data between two databases.

It is used to backup file based or in-memory databases.

Equivalent to the sqlite3_backup* C object.

https://www.sqlite.org/c3ref/backup_finish.html

func (*Backup) Finish added in v0.2.1

func (b *Backup) Finish() error

Finish is called to clean up the resources allocated by BackupInit.

https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backupfinish

func (*Backup) PageCount added in v0.2.1

func (b *Backup) PageCount() int

PageCount returns the total number of pages in the source database at the conclusion of the most recent b.Step().

https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backuppagecount

func (*Backup) Remaining added in v0.2.1

func (b *Backup) Remaining() int

Remaining returns the number of pages still to be backed up at the conclusion of the most recent b.Step().

https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backupremaining

func (*Backup) Step added in v0.2.1

func (b *Backup) Step(nPage int) error

Step is called one or more times to transfer nPage pages at a time between databases.

Use -1 to transfer the entire database at once.

https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backupstep

type Blob

type Blob struct {
	io.ReadWriteSeeker
	io.ReaderAt
	io.WriterAt
	io.Closer
	// contains filtered or unexported fields
}

Blob provides streaming access to SQLite blobs.

func (*Blob) Close

func (blob *Blob) Close() error

https://www.sqlite.org/c3ref/blob_close.html

func (*Blob) Read

func (blob *Blob) Read(p []byte) (n int, err error)

func (*Blob) ReadAt

func (blob *Blob) ReadAt(p []byte, off int64) (n int, err error)

https://www.sqlite.org/c3ref/blob_read.html

func (*Blob) Seek

func (blob *Blob) Seek(offset int64, whence int) (int64, error)

func (*Blob) Size

func (blob *Blob) Size() int64

Size returns the total size of a blob.

func (*Blob) Write

func (blob *Blob) Write(p []byte) (n int, err error)

func (*Blob) WriteAt

func (blob *Blob) WriteAt(p []byte, off int64) (n int, err error)

https://www.sqlite.org/c3ref/blob_write.html

type Changegroup

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

func (Changegroup) Delete

func (cg Changegroup) Delete()

Delete a Changegroup.

https://www.sqlite.org/session/sqlite3changegroup_delete.html

type ChangesetIter

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

ChangesetIter is an iterator over a changeset.

An iterator is used much like a Stmt over result rows. It is also used in the conflictFn provided to ChangesetApply. To process the changes in a changeset:

iter, err := ChangesetIterStart(r)
if err != nil {
	// ... handle err
}
for {
	hasRow, err := iter.Next()
	if err != nil {
		// ... handle err
	}
	if !hasRow {
		break
	}
	// Use the Op, New, Old method to inspect the change.
}
if err := iter.Finalize(); err != nil {
	// ... handle err
}

func ChangesetIterStart

func ChangesetIterStart(r io.Reader) (ChangesetIter, error)

ChangesetIterStart creates an iterator over a changeset.

https://www.sqlite.org/session/sqlite3changeset_start.html

func (ChangesetIter) Conflict

func (iter ChangesetIter) Conflict(col int) (v Value, err error)

Conflict obtains conflicting row values from an iterator. Only use this in an iterator passed to a ChangesetApply conflictFn.

https://www.sqlite.org/session/sqlite3changeset_conflict.html

func (ChangesetIter) FKConflicts

func (iter ChangesetIter) FKConflicts() (int, error)

FKConflicts reports the number of foreign key constraint violations.

https://www.sqlite.org/session/sqlite3changeset_fk_conflicts.html

func (ChangesetIter) Finalize

func (iter ChangesetIter) Finalize() error

Finalize deletes a changeset iterator. Do not use in iterators passed to a ChangesetApply conflictFn.

https://www.sqlite.org/session/sqlite3changeset_finalize.html

func (ChangesetIter) New

func (iter ChangesetIter) New(col int) (v Value, err error)

New obtains new row values from an iterator.

https://www.sqlite.org/session/sqlite3changeset_new.html

func (ChangesetIter) Next

func (iter ChangesetIter) Next() (rowReturned bool, err error)

Next moves a changeset iterator forward. Do not use in iterators passed to a ChangesetApply conflictFn.

https://www.sqlite.org/session/sqlite3changeset_next.html

func (ChangesetIter) Old

func (iter ChangesetIter) Old(col int) (v Value, err error)

Old obtains old row values from an iterator.

https://www.sqlite.org/session/sqlite3changeset_old.html

func (ChangesetIter) Op

func (iter ChangesetIter) Op() (table string, numCols int, opType OpType, indirect bool, err error)

Op reports details about the current operation in the iterator.

https://www.sqlite.org/session/sqlite3changeset_op.html

func (ChangesetIter) PK

func (iter ChangesetIter) PK() ([]bool, error)

PK reports the columns that make up the primary key.

https://www.sqlite.org/session/sqlite3changeset_pk.html

type ColumnType

type ColumnType int

ColumnType are codes for each of the SQLite fundamental datatypes:

64-bit signed integer
64-bit IEEE floating point number
string
BLOB
NULL

https://www.sqlite.org/c3ref/c_blob.html

func (ColumnType) String

func (t ColumnType) String() string

type ConflictAction

type ConflictAction int

func (ConflictAction) String

func (code ConflictAction) String() string

type ConflictType

type ConflictType int

func (ConflictType) String

func (code ConflictType) String() string

type Conn

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

Conn is an open connection to an SQLite3 database.

A Conn can only be used by goroutine at a time.

func OpenConn

func OpenConn(path string, flags OpenFlags) (*Conn, error)

OpenConn opens a single SQLite database connection. A flags value of 0 defaults to:

SQLITE_OPEN_READWRITE
SQLITE_OPEN_CREATE
SQLITE_OPEN_WAL
SQLITE_OPEN_URI
SQLITE_OPEN_NOMUTEX

https://www.sqlite.org/c3ref/open.html

func (*Conn) BackupInit added in v0.2.1

func (src *Conn) BackupInit(srcDB, dstDB string, dst *Conn) (*Backup, error)

BackupInit initializes a new Backup object to copy from src to dst.

If srcDB or dstDB is "", then a default of "main" is used.

https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backupinit

func (*Conn) BackupToDB added in v0.2.1

func (src *Conn) BackupToDB(srcDB, dstPath string) (dst *Conn, err error)

BackupToDB creates a complete backup of the srcDB on the src Conn to a new database Conn at dstPath. The resulting dst connection is returned. This will block until the entire backup is complete.

If srcDB is "", then a default of "main" is used.

This is very similar to the first example function implemented on the following page.

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

func (*Conn) Changes

func (conn *Conn) Changes() int

Changes reports the number of rows affected by the most recent statement.

https://www.sqlite.org/c3ref/changes.html

func (*Conn) ChangesetApply

func (conn *Conn) ChangesetApply(r io.Reader,
	filterFn func(tableName string) bool,
	conflictFn func(ConflictType, ChangesetIter) ConflictAction) error

ChangesetApply applies a changeset to the database.

If a changeset will not apply cleanly then conflictFn can be used to resolve the conflict. See the SQLite documentation for full details.

https://www.sqlite.org/session/sqlite3changeset_apply.html

func (*Conn) ChangesetApplyInverse added in v0.3.1

func (conn *Conn) ChangesetApplyInverse(r io.Reader,
	filterFn func(tableName string) bool,
	conflictFn func(ConflictType, ChangesetIter) ConflictAction) error

ChangesetApplyInverse applies the inverse of a changeset to the database.

If a changeset will not apply cleanly then conflictFn can be used to resolve the conflict. See the SQLite documentation for full details.

This is equivalent to inverting a changeset using ChangesetInvert before applying it. It is an error to use a patchset.

https://www.sqlite.org/session/sqlite3changeset_apply.html

https://www.sqlite.org/session/c_changesetapply_invert.html

https://www.sqlite.org/session/sqlite3changeset_invert.html

func (*Conn) CheckReset added in v0.2.1

func (conn *Conn) CheckReset() string

CheckReset reports whether any statement on this connection is in the process of returning results.

func (*Conn) Close

func (conn *Conn) Close() error

Close closes the database connection using sqlite3_close and finalizes persistent prepared statements. https://www.sqlite.org/c3ref/close.html

func (*Conn) CreateFunction

func (conn *Conn) CreateFunction(name string, deterministic bool, numArgs int, xFunc, xStep func(Context, ...Value), xFinal func(Context)) error

CreateFunction registers a Go function with SQLite for use in SQL queries.

To define a scalar function, provide a value for xFunc and set xStep/xFinal to nil.

To define an aggregation set xFunc to nil and provide values for xStep and xFinal.

State can be stored across function calls by using the Context UserData/SetUserData methods.

https://sqlite.org/c3ref/create_function.html

func (*Conn) CreateSession

func (conn *Conn) CreateSession(db string) (*Session, error)

CreateSession creates a new session object. If db is "", then a default of "main" is used.

https://www.sqlite.org/session/sqlite3session_create.html

func (*Conn) EnableDoubleQuotedStringLiterals added in v0.2.1

func (conn *Conn) EnableDoubleQuotedStringLiterals(dml, ddl bool) error

EnableDoubleQuotedStringLiterals allows fine grained control over whether double quoted string literals are accepted in Data Manipulation Language or Data Definition Language queries.

By default DQS is disabled since double quotes should indicate an identifier.

https://sqlite.org/quirks.html#dblquote

func (*Conn) EnableLoadExtension added in v0.1.1

func (conn *Conn) EnableLoadExtension(on bool) error

EnableLoadExtension allows extensions to be loaded via LoadExtension(). The SQL interface is left disabled as recommended.

https://www.sqlite.org/c3ref/enable_load_extension.html

func (*Conn) GetAutocommit added in v0.2.1

func (conn *Conn) GetAutocommit() bool

func (*Conn) GetSnapshot added in v0.2.1

func (conn *Conn) GetSnapshot(schema string) (*Snapshot, func(), error)

GetSnapshot attempts to make a new Snapshot that records the current state of the given schema in conn. If successful, a *Snapshot and a func() is returned, and the conn will have an open READ transaction which will continue to reflect the state of the Snapshot until the returned func() is called. No WRITE transaction may occur on conn until the returned func() is called.

The returned *Snapshot is threadsafe for creating additional read transactions that reflect its state with Conn.StartSnapshotRead.

In theory, so long as at least one read transaction is open on the Snapshot, then the WAL file will not be checkpointed past that point, and the Snapshot will continue to be available for creating additional read transactions. However, if no read transaction is open on the Snapshot, then it is possible for the WAL to be checkpointed past the point of the Snapshot. If this occurs then there is no way to start a read on the Snapshot. In order to ensure that a Snapshot remains readable, always maintain at least one open read transaction on the Snapshot.

In practice, this is generally reliable but sometimes the Snapshot can sometimes become unavailable for reads unless automatic checkpointing is entirely disabled from the start.

The returned *Snapshot has a finalizer that calls Free if it has not been called, so it is safe to allow a Snapshot to be garbage collected. However, if you are sure that a Snapshot will never be used again by any thread, you may call Free once to release the memory earlier. No reads will be possible on the Snapshot after Free is called on it, however any open read transactionss will not be interrupted.

See sqlitex.Pool.GetSnapshot for a helper function for automatically keeping an open read transaction on a set aside connection until a Snapshot is GC'd.

The following must be true for this function to succeed:

- The schema of conn must be a WAL mode database.

- There must not be any transaction open on schema of conn.

- At least one transaction must have been written to the current WAL file since it was created on disk (by any connection). You can run the following SQL to ensure that a WAL file has been created.

BEGIN IMMEDIATE;
COMMIT;

https://www.sqlite.org/c3ref/snapshot_get.html

func (*Conn) LastInsertRowID

func (conn *Conn) LastInsertRowID() int64

LastInsertRowID reports the rowid of the most recently successful INSERT.

https://www.sqlite.org/c3ref/last_insert_rowid.html

func (*Conn) Limit added in v0.3.1

func (conn *Conn) Limit(id Limit, value int) int

Limit sets a runtime limit on the connection. The the previous value of the limit is returned. Pass a negative value to check the limit without changing it.

https://sqlite.org/c3ref/limit.html

func (*Conn) LoadExtension added in v0.1.1

func (conn *Conn) LoadExtension(ext, entry string) error

LoadExtension attempts to load a runtime-loadable extension.

https://www.sqlite.org/c3ref/load_extension.html

func (*Conn) OpenBlob

func (conn *Conn) OpenBlob(dbn, table, column string, row int64, write bool) (*Blob, error)

OpenBlob opens a blob in a particular {database,table,column,row}.

https://www.sqlite.org/c3ref/blob_open.html

func (*Conn) Prep

func (conn *Conn) Prep(query string) *Stmt

Prep returns a persistent SQL statement.

Any error in preparation will panic.

Persistent prepared statements are cached by the query string in a Conn. If Finalize is not called, then subsequent calls to Prepare will return the same statement.

https://www.sqlite.org/c3ref/prepare.html

func (*Conn) Prepare

func (conn *Conn) Prepare(query string) (*Stmt, error)

Prepare prepares a persistent SQL statement.

Persistent prepared statements are cached by the query string in a Conn. If Finalize is not called, then subsequent calls to Prepare will return the same statement.

If the query has any unprocessed trailing bytes, Prepare returns an error.

https://www.sqlite.org/c3ref/prepare.html

func (*Conn) PrepareTransient

func (conn *Conn) PrepareTransient(query string) (stmt *Stmt, trailingBytes int, err error)

PrepareTransient prepares an SQL statement that is not cached by the Conn. Subsequent calls with the same query will create new Stmts. Finalize must be called by the caller once done with the Stmt.

The number of trailing bytes not consumed from query is returned.

To run a sequence of queries once as part of a script, the sqlitex package provides an ExecScript function built on this.

https://www.sqlite.org/c3ref/prepare.html

func (*Conn) SetAuthorizer added in v0.3.1

func (conn *Conn) SetAuthorizer(auth Authorizer) error

SetAuthorizer registers an authorizer for the database connection. SetAuthorizer(nil) clears any authorizer previously set.

func (*Conn) SetBusyTimeout added in v0.1.1

func (conn *Conn) SetBusyTimeout(d time.Duration)

SetBusyTimeout sets a busy handler that sleeps for up to d to acquire a lock.

By default, a large busy timeout (10s) is set on the assumption that Go programs use a context object via SetInterrupt to control timeouts.

https://www.sqlite.org/c3ref/busy_timeout.html

func (*Conn) SetInterrupt

func (conn *Conn) SetInterrupt(doneCh <-chan struct{}) (oldDoneCh <-chan struct{})

SetInterrupt assigns a channel to control connection execution lifetime.

When doneCh is closed, the connection uses sqlite3_interrupt to stop long-running queries and cancels any *Stmt.Step calls that are blocked waiting for the database write lock.

Subsequent uses of the connection will return SQLITE_INTERRUPT errors until doneCh is reset with a subsequent call to SetInterrupt.

Typically, doneCh is provided by the Done method on a context.Context. For example, a timeout can be associated with a connection session:

ctx := context.WithTimeout(context.Background(), 100*time.Millisecond)
conn.SetInterrupt(ctx.Done())

Any busy statements at the time SetInterrupt is called will be reset.

SetInterrupt returns the old doneCh assigned to the connection.

func (*Conn) SetTracer added in v0.2.1

func (conn *Conn) SetTracer(tracer Tracer)

func (*Conn) StartSnapshotRead added in v0.2.1

func (conn *Conn) StartSnapshotRead(s *Snapshot) (endRead func(), err error)

StartSnapshotRead starts a new read transaction on conn such that the read transaction refers to historical Snapshot s, rather than the most recent change to the database.

There must be no open transaction on conn. Free must not have been called on s prior to or during this function call.

If err is nil, then endRead is a function that will end the read transaction and return conn to its original state. Until endRead is called, no writes may occur on conn, and all reads on conn will refer to the Snapshot.

https://www.sqlite.org/c3ref/snapshot_open.html

func (*Conn) Tracer added in v0.2.1

func (conn *Conn) Tracer() Tracer

type Context

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

Context is an *sqlite3_context. It is used by custom functions to return result values. An SQLite context is in no way related to a Go context.Context.

func (Context) ResultError

func (ctx Context) ResultError(err error)

func (Context) ResultFloat

func (ctx Context) ResultFloat(v float64)

func (Context) ResultInt

func (ctx Context) ResultInt(v int)

func (Context) ResultInt64

func (ctx Context) ResultInt64(v int64)

func (Context) ResultNull

func (ctx Context) ResultNull()

func (Context) ResultText

func (ctx Context) ResultText(v string)

func (Context) ResultValue

func (ctx Context) ResultValue(v Value)

func (Context) ResultZeroBlob

func (ctx Context) ResultZeroBlob(n int64)

func (Context) SetUserData

func (ctx Context) SetUserData(data interface{})

func (Context) UserData

func (ctx Context) UserData() interface{}

type Error

type Error struct {
	Code  ErrorCode // SQLite extended error code (SQLITE_OK is an invalid value)
	Loc   string    // method name that generated the error
	Query string    // original SQL query text
	Msg   string    // value of sqlite3_errmsg, set sqlite.ErrMsg = true
}

Error is an error produced by SQLite.

func (Error) Error

func (err Error) Error() string

type ErrorCode

type ErrorCode int

ErrorCode is an SQLite extended error code.

The three SQLite result codes (SQLITE_OK, SQLITE_ROW, and SQLITE_DONE), are not errors so they should not be used in an Error.

func ErrCode

func ErrCode(err error) ErrorCode

ErrCode extracts the SQLite error code from err. If err is not a sqlite Error, SQLITE_ERROR is returned. If err is nil, SQLITE_OK is returned.

This function supports wrapped errors that implement

interface { Cause() error }

for errors from packages like https://github.com/pkg/errors

func (ErrorCode) String

func (code ErrorCode) String() string

type Incrementor added in v0.2.5

type Incrementor func() int

Incrementor is a closure around a value that returns and increments the value on each call. For example, the boolean statments in the following code snippet would all be true.

i := NewIncrementor(3)
i() == 3
i() == 4
i() == 5

This is provided as syntactic sugar for dealing with bind param and column indexes. See BindIncrementor and ColumnIncrementor for small examples.

func BindIncrementor added in v0.2.5

func BindIncrementor() Incrementor

BindIncrementor returns an Incrementor that starts on 1, the first index used in Stmt.Bind* functions. This is provided as syntactic sugar for binding parameter values to a Stmt. It allows for easily changing query parameters without manually fixing up the bind indexes, which can be error prone. For example,

stmt := conn.Prep(`INSERT INTO test (a, b, c) VALUES (?, ?, ?);`)
i := BindIncrementor()
stmt.BindInt64(i(), a)          // i() == 1
if b > 0 {
        stmt.BindInt64(i(), b)  // i() == 2
} else {
        // Remember to increment the index even if a param is NULL
        stmt.BindNull(i())      // i() == 2
}
stmt.BindText(i(), c)           // i() == 3

func ColumnIncrementor added in v0.2.5

func ColumnIncrementor() Incrementor

ColumnIncrementor returns an Incrementor that starts on 0, the first index used in Stmt.Column* functions. This is provided as syntactic sugar for parsing column values from a Stmt. It allows for easily changing queried columns without manually fixing up the column indexes, which can be error prone. For example,

stmt := conn.Prep(`SELECT a, b, c FROM test;`)
stmt.Step()
i := ColumnIncrementor()
a := stmt.ColumnInt64(i())      // i() == 1
b := stmt.ColumnInt64(i())      // i() == 2
c := stmt.ColumnText(i())       // i() == 3

func NewIncrementor added in v0.2.5

func NewIncrementor(start int) Incrementor

NewIncrementor returns an Incrementor that starts on start.

type Limit added in v0.3.1

type Limit int

Limit is a category of performance limits.

https://sqlite.org/c3ref/c_limit_attached.html

func (Limit) String added in v0.3.1

func (limit Limit) String() string

String returns the limit's C constant name.

type OpType

type OpType int

OpType is an enumeration of SQLite statements. Used for authorization and changeset details.

const (
	SQLITE_CREATE_INDEX        OpType = C.SQLITE_CREATE_INDEX
	SQLITE_CREATE_TABLE        OpType = C.SQLITE_CREATE_TABLE
	SQLITE_CREATE_TEMP_INDEX   OpType = C.SQLITE_CREATE_TEMP_INDEX
	SQLITE_CREATE_TEMP_TABLE   OpType = C.SQLITE_CREATE_TEMP_TABLE
	SQLITE_CREATE_TEMP_TRIGGER OpType = C.SQLITE_CREATE_TEMP_TRIGGER
	SQLITE_CREATE_TEMP_VIEW    OpType = C.SQLITE_CREATE_TEMP_VIEW
	SQLITE_CREATE_TRIGGER      OpType = C.SQLITE_CREATE_TRIGGER
	SQLITE_CREATE_VIEW         OpType = C.SQLITE_CREATE_VIEW
	SQLITE_DELETE              OpType = C.SQLITE_DELETE
	SQLITE_DROP_INDEX          OpType = C.SQLITE_DROP_INDEX
	SQLITE_DROP_TABLE          OpType = C.SQLITE_DROP_TABLE
	SQLITE_DROP_TEMP_INDEX     OpType = C.SQLITE_DROP_TEMP_INDEX
	SQLITE_DROP_TEMP_TABLE     OpType = C.SQLITE_DROP_TEMP_TABLE
	SQLITE_DROP_TEMP_TRIGGER   OpType = C.SQLITE_DROP_TEMP_TRIGGER
	SQLITE_DROP_TEMP_VIEW      OpType = C.SQLITE_DROP_TEMP_VIEW
	SQLITE_DROP_TRIGGER        OpType = C.SQLITE_DROP_TRIGGER
	SQLITE_DROP_VIEW           OpType = C.SQLITE_DROP_VIEW
	SQLITE_INSERT              OpType = C.SQLITE_INSERT
	SQLITE_PRAGMA              OpType = C.SQLITE_PRAGMA
	SQLITE_READ                OpType = C.SQLITE_READ
	SQLITE_SELECT              OpType = C.SQLITE_SELECT
	SQLITE_TRANSACTION         OpType = C.SQLITE_TRANSACTION
	SQLITE_UPDATE              OpType = C.SQLITE_UPDATE
	SQLITE_ATTACH              OpType = C.SQLITE_ATTACH
	SQLITE_DETACH              OpType = C.SQLITE_DETACH
	SQLITE_ALTER_TABLE         OpType = C.SQLITE_ALTER_TABLE
	SQLITE_REINDEX             OpType = C.SQLITE_REINDEX
	SQLITE_ANALYZE             OpType = C.SQLITE_ANALYZE
	SQLITE_CREATE_VTABLE       OpType = C.SQLITE_CREATE_VTABLE
	SQLITE_DROP_VTABLE         OpType = C.SQLITE_DROP_VTABLE
	SQLITE_FUNCTION            OpType = C.SQLITE_FUNCTION
	SQLITE_SAVEPOINT           OpType = C.SQLITE_SAVEPOINT
	SQLITE_COPY                OpType = C.SQLITE_COPY
	SQLITE_RECURSIVE           OpType = C.SQLITE_RECURSIVE
)

Operation types

func (OpType) String

func (opType OpType) String() string

type OpenFlags

type OpenFlags int

OpenFlags are flags used when opening a Conn.

https://www.sqlite.org/c3ref/c_open_autoproxy.html

type Session

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

A Session tracks database changes made by a Conn.

It is used to build changesets.

Equivalent to the sqlite3_session* C object.

func (*Session) Attach

func (s *Session) Attach(tableName string) error

Attach attaches a table to the session object. Changes made to the table will be tracked by the session.

An empty tableName attaches all the tables in the database.

func (*Session) Changeset

func (s *Session) Changeset(w io.Writer) error

Changeset generates a changeset from a session.

https://www.sqlite.org/session/sqlite3session_changeset.html

func (*Session) Delete

func (s *Session) Delete()

Delete deletes a Session object.

https://www.sqlite.org/session/sqlite3session_delete.html

func (*Session) Diff

func (s *Session) Diff(srcDB, tableName string) error

Diff appends the difference between two tables (srcDB and the session DB) to the session. The two tables must have the same name and schema.

func (*Session) Disable

func (s *Session) Disable()

Disable disables recording of changes by a Session.

https://www.sqlite.org/session/sqlite3session_enable.html

func (*Session) Enable

func (s *Session) Enable()

Enable enables recording of changes by a Session. New Sessions start enabled.

https://www.sqlite.org/session/sqlite3session_enable.html

func (*Session) Patchset

func (s *Session) Patchset(w io.Writer) error

Patchset generates a patchset from a session.

https://www.sqlite.org/session/sqlite3session_patchset.html

type Snapshot added in v0.2.1

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

A Snapshot records the state of a WAL mode database for some specific point in history.

Equivalent to the sqlite3_snapshot* C object.

https://www.sqlite.org/c3ref/snapshot.html

func (*Snapshot) CompareAges added in v0.2.1

func (s *Snapshot) CompareAges(s2 *Snapshot) int

CompareAges returns whether s1 is older, newer or the same age as s2. Age refers to writes on the database, not time since creation.

If s is older than s2, a negative number is returned. If s and s2 are the same age, zero is returned. If s is newer than s2, a positive number is returned.

The result is valid only if both of the following are true:

- The two snapshot handles are associated with the same database file.

- Both of the Snapshots were obtained since the last time the wal file was deleted.

https://www.sqlite.org/c3ref/snapshot_cmp.html

func (*Snapshot) Free added in v0.2.1

func (s *Snapshot) Free()

Free destroys a Snapshot. Free is not threadsafe but may be called more than once. However, it is not necessary to call Free on a Snapshot returned by conn.GetSnapshot or pool.GetSnapshot as these set a finalizer that calls free which will be run automatically by the GC in a finalizer. However if it is guaranteed that a Snapshot will never be used again, calling Free will allow memory to be freed earlier.

A Snapshot may become unavailable for reads before Free is called if the WAL is checkpointed into the DB past the point of the Snapshot.

https://www.sqlite.org/c3ref/snapshot_free.html

type Stmt

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

Stmt is an SQLite3 prepared statement.

A Stmt is attached to a particular Conn (and that Conn can only be used by a single goroutine).

When a Stmt is no longer needed it should be cleaned up by calling the Finalize method.

func (*Stmt) BindBool

func (stmt *Stmt) BindBool(param int, value bool)

BindBool binds value (as an integer 0 or 1) to a numbered stmt parameter.

Parameter indices start at 1.

https://www.sqlite.org/c3ref/bind_blob.html

func (*Stmt) BindBytes

func (stmt *Stmt) BindBytes(param int, value []byte)

BindBytes binds value to a numbered stmt parameter.

In-memory copies of value are made using this interface. For large blobs, consider using the streaming Blob object.

Parameter indices start at 1.

https://www.sqlite.org/c3ref/bind_blob.html

func (*Stmt) BindFloat

func (stmt *Stmt) BindFloat(param int, value float64)

BindFloat binds value to a numbered stmt parameter.

Parameter indices start at 1.

https://www.sqlite.org/c3ref/bind_blob.html

func (*Stmt) BindInt64

func (stmt *Stmt) BindInt64(param int, value int64)

BindInt64 binds value to a numbered stmt parameter.

Parameter indices start at 1.

https://www.sqlite.org/c3ref/bind_blob.html

func (*Stmt) BindNull

func (stmt *Stmt) BindNull(param int)

BindNull binds an SQL NULL value to a numbered stmt parameter.

Parameter indices start at 1.

https://www.sqlite.org/c3ref/bind_blob.html

func (*Stmt) BindParamCount

func (stmt *Stmt) BindParamCount() int

BindParamCount reports the number of parameters in stmt.

https://www.sqlite.org/c3ref/bind_parameter_count.html

func (*Stmt) BindText

func (stmt *Stmt) BindText(param int, value string)

BindText binds value to a numbered stmt parameter.

Parameter indices start at 1.

https://www.sqlite.org/c3ref/bind_blob.html

func (*Stmt) BindZeroBlob

func (stmt *Stmt) BindZeroBlob(param int, len int64)

BindNull binds a blob of zeros of length len to a numbered stmt parameter.

Parameter indices start at 1.

https://www.sqlite.org/c3ref/bind_blob.html

func (*Stmt) ClearBindings

func (stmt *Stmt) ClearBindings() error

ClearBindings clears all bound parameter values on a statement.

https://www.sqlite.org/c3ref/clear_bindings.html

func (*Stmt) ColumnBytes

func (stmt *Stmt) ColumnBytes(col int, buf []byte) int

ColumnBytes reads a query result into buf. It reports the number of bytes read.

Column indices start at 0.

https://www.sqlite.org/c3ref/column_blob.html

func (*Stmt) ColumnCount

func (stmt *Stmt) ColumnCount() int

ColumnCount returns the number of columns in the result set returned by the prepared statement.

https://sqlite.org/c3ref/column_count.html

func (*Stmt) ColumnDatabaseName

func (stmt *Stmt) ColumnDatabaseName(col int) string

func (*Stmt) ColumnFloat

func (stmt *Stmt) ColumnFloat(col int) float64

ColumnFloat returns a query result as a float64.

Column indices start at 0.

https://www.sqlite.org/c3ref/column_blob.html

func (*Stmt) ColumnIndex added in v0.2.3

func (stmt *Stmt) ColumnIndex(colName string) int

ColumnIndex returns the index of the column with the given name.

If there is no column with the given name ColumnIndex returns -1.

func (*Stmt) ColumnInt

func (stmt *Stmt) ColumnInt(col int) int

ColumnInt returns a query result value as an int.

Note: this method calls sqlite3_column_int64 and then converts the resulting 64-bits to an int.

Column indices start at 0.

https://www.sqlite.org/c3ref/column_blob.html

func (*Stmt) ColumnInt32

func (stmt *Stmt) ColumnInt32(col int) int32

ColumnInt32 returns a query result value as an int32.

Column indices start at 0.

https://www.sqlite.org/c3ref/column_blob.html

func (*Stmt) ColumnInt64

func (stmt *Stmt) ColumnInt64(col int) int64

ColumnInt64 returns a query result value as an int64.

Column indices start at 0.

https://www.sqlite.org/c3ref/column_blob.html

func (*Stmt) ColumnLen

func (stmt *Stmt) ColumnLen(col int) int

ColumnLen returns the number of bytes in a query result.

Column indices start at 0.

https://www.sqlite.org/c3ref/column_blob.html

func (*Stmt) ColumnName

func (stmt *Stmt) ColumnName(col int) string

ColumnName returns the name assigned to a particular column in the result set of a SELECT statement.

https://sqlite.org/c3ref/column_name.html

func (*Stmt) ColumnReader

func (stmt *Stmt) ColumnReader(col int) *bytes.Reader

ColumnReader creates a byte reader for a query result column.

The reader directly references C-managed memory that stops being valid as soon as the statement row resets.

func (*Stmt) ColumnTableName

func (stmt *Stmt) ColumnTableName(col int) string

func (*Stmt) ColumnText

func (stmt *Stmt) ColumnText(col int) string

ColumnText returns a query result as a string.

Column indices start at 0.

https://www.sqlite.org/c3ref/column_blob.html

func (*Stmt) ColumnType

func (stmt *Stmt) ColumnType(col int) ColumnType

ColumnType returns the datatype code for the initial data type of the result column. The returned value is one of:

SQLITE_INTEGER
SQLITE_FLOAT
SQLITE_TEXT
SQLITE_BLOB
SQLITE_NULL

Column indices start at 0.

https://www.sqlite.org/c3ref/column_blob.html

func (*Stmt) DataCount

func (stmt *Stmt) DataCount() int

DataCount returns the number of columns in the current row of the result set of prepared statement.

https://sqlite.org/c3ref/data_count.html

func (*Stmt) Finalize

func (stmt *Stmt) Finalize() error

Finalize deletes a prepared statement.

Be sure to always call Finalize when done with a statement created using PrepareTransient.

Do not call Finalize on a prepared statement that you intend to prepare again in the future.

https://www.sqlite.org/c3ref/finalize.html

func (*Stmt) GetBytes

func (stmt *Stmt) GetBytes(colName string, buf []byte) int

GetBytes reads a query result for colName into buf. It reports the number of bytes read.

func (*Stmt) GetFloat

func (stmt *Stmt) GetFloat(colName string) float64

GetFloat returns a query result value for colName as a float64.

func (*Stmt) GetInt64

func (stmt *Stmt) GetInt64(colName string) int64

GetInt64 returns a query result value for colName as an int64.

func (*Stmt) GetLen

func (stmt *Stmt) GetLen(colName string) int

GetLen returns the number of bytes in a query result for colName.

func (*Stmt) GetReader

func (stmt *Stmt) GetReader(colName string) *bytes.Reader

GetReader creates a byte reader for colName.

The reader directly references C-managed memory that stops being valid as soon as the statement row resets.

func (*Stmt) GetText

func (stmt *Stmt) GetText(colName string) string

GetText returns a query result value for colName as a string.

func (*Stmt) Reset

func (stmt *Stmt) Reset() error

Reset resets a prepared statement so it can be executed again.

Note that any parameter values bound to the statement are retained. To clear bound values, call ClearBindings.

https://www.sqlite.org/c3ref/reset.html

func (*Stmt) SetBool

func (stmt *Stmt) SetBool(param string, value bool)

SetBool binds a value (as a 0 or 1) to a parameter using a column name.

func (*Stmt) SetBytes

func (stmt *Stmt) SetBytes(param string, value []byte)

SetBytes binds bytes to a parameter using a column name. An invalid parameter name will cause the call to Step to return an error.

func (*Stmt) SetFloat

func (stmt *Stmt) SetFloat(param string, value float64)

SetFloat binds a float64 to a parameter using a column name. An invalid parameter name will cause the call to Step to return an error.

func (*Stmt) SetInt64

func (stmt *Stmt) SetInt64(param string, value int64)

SetInt64 binds an int64 to a parameter using a column name.

func (*Stmt) SetNull

func (stmt *Stmt) SetNull(param string)

SetNull binds a null to a parameter using a column name. An invalid parameter name will cause the call to Step to return an error.

func (*Stmt) SetText

func (stmt *Stmt) SetText(param string, value string)

SetText binds text to a parameter using a column name. An invalid parameter name will cause the call to Step to return an error.

func (*Stmt) SetZeroBlob

func (stmt *Stmt) SetZeroBlob(param string, len int64)

SetZeroBlob binds a zero blob of length len to a parameter using a column name. An invalid parameter name will cause the call to Step to return an error.

func (*Stmt) Step

func (stmt *Stmt) Step() (rowReturned bool, err error)

Step moves through the statement cursor using sqlite3_step.

If a row of data is available, rowReturned is reported as true. If the statement has reached the end of the available data then rowReturned is false. Thus the status codes SQLITE_ROW and SQLITE_DONE are reported by the rowReturned bool, and all other non-OK status codes are reported as an error.

If an error value is returned, then the statement has been reset.

https://www.sqlite.org/c3ref/step.html

Shared cache

As the sqlite package enables shared cache mode by default and multiple writers are common in multi-threaded programs, this Step method uses sqlite3_unlock_notify to handle any SQLITE_LOCKED errors.

Without the shared cache, SQLite will block for several seconds while trying to acquire the write lock. With the shared cache, it returns SQLITE_LOCKED immediately if the write lock is held by another connection in this process. Dealing with this correctly makes for an unpleasant programming experience, so this package does it automatically by blocking Step until the write lock is relinquished.

This means Step can block for a very long time. Use SetInterrupt to control how long Step will block.

For far more details, see:

http://www.sqlite.org/unlock_notify.html

type Tracer added in v0.2.1

type Tracer interface {
	NewTask(name string) TracerTask
	Push(name string)
	Pop()
}

type TracerTask added in v0.2.1

type TracerTask interface {
	StartRegion(regionType string)
	EndRegion()
	End()
}

type Value

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

func (Value) Blob

func (v Value) Blob() []byte

func (Value) Float

func (v Value) Float() float64

func (Value) Int

func (v Value) Int() int

func (Value) Int64

func (v Value) Int64() int64

func (Value) IsNil added in v0.2.1

func (v Value) IsNil() bool

func (Value) Len

func (v Value) Len() int

func (Value) Text

func (v Value) Text() string

func (Value) Type added in v0.2.1

func (v Value) Type() ColumnType

Directories

Path Synopsis
Package sqlitex provides utilities for working with SQLite.
Package sqlitex provides utilities for working with SQLite.

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