// Copyright (C) 2014 Yasuhiro Matsumoto <mattn.jp@gmail.com>. // // Use of this source code is governed by an MIT-style // license that can be found in the LICENSE file. package sqlite3 /* #cgo CFLAGS: -std=gnu99 #cgo CFLAGS: -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE=1 #cgo CFLAGS: -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS4_UNICODE61 #cgo CFLAGS: -DSQLITE_TRACE_SIZE_LIMIT=15 #cgo CFLAGS: -DSQLITE_DISABLE_INTRINSIC #cgo CFLAGS: -Wno-deprecated-declarations #ifndef USE_LIBSQLITE3 #include <sqlite3-binding.h> #else #include <sqlite3.h> #endif #include <stdlib.h> #include <string.h> #ifdef __CYGWIN__ # include <errno.h> #endif #ifndef SQLITE_OPEN_READWRITE # define SQLITE_OPEN_READWRITE 0 #endif #ifndef SQLITE_OPEN_FULLMUTEX # define SQLITE_OPEN_FULLMUTEX 0 #endif #ifndef SQLITE_DETERMINISTIC # define SQLITE_DETERMINISTIC 0 #endif static int _sqlite3_open_v2(const char *filename, sqlite3 **ppDb, int flags, const char *zVfs) { #ifdef SQLITE_OPEN_URI return sqlite3_open_v2(filename, ppDb, flags | SQLITE_OPEN_URI, zVfs); #else return sqlite3_open_v2(filename, ppDb, flags, zVfs); #endif } static int _sqlite3_bind_text(sqlite3_stmt *stmt, int n, char *p, int np) { return sqlite3_bind_text(stmt, n, p, np, SQLITE_TRANSIENT); } static int _sqlite3_bind_blob(sqlite3_stmt *stmt, int n, void *p, int np) { return sqlite3_bind_blob(stmt, n, p, np, SQLITE_TRANSIENT); } #include <stdio.h> #include <stdint.h> static int _sqlite3_exec(sqlite3* db, const char* pcmd, long long* rowid, long long* changes) { int rv = sqlite3_exec(db, pcmd, 0, 0, 0); *rowid = (long long) sqlite3_last_insert_rowid(db); *changes = (long long) sqlite3_changes(db); return rv; } static int _sqlite3_step(sqlite3_stmt* stmt, long long* rowid, long long* changes) { int rv = sqlite3_step(stmt); sqlite3* db = sqlite3_db_handle(stmt); *rowid = (long long) sqlite3_last_insert_rowid(db); *changes = (long long) sqlite3_changes(db); return rv; } void _sqlite3_result_text(sqlite3_context* ctx, const char* s) { sqlite3_result_text(ctx, s, -1, &free); } void _sqlite3_result_blob(sqlite3_context* ctx, const void* b, int l) { sqlite3_result_blob(ctx, b, l, SQLITE_TRANSIENT); } int _sqlite3_create_function( sqlite3 *db, const char *zFunctionName, int nArg, int eTextRep, uintptr_t pApp, void (*xFunc)(sqlite3_context*,int,sqlite3_value**), void (*xStep)(sqlite3_context*,int,sqlite3_value**), void (*xFinal)(sqlite3_context*) ) { return sqlite3_create_function(db, zFunctionName, nArg, eTextRep, (void*) pApp, xFunc, xStep, xFinal); } void callbackTrampoline(sqlite3_context*, int, sqlite3_value**); int commitHookTrampoline(void*); void rollbackHookTrampoline(void*); void updateHookTrampoline(void*, int, char*, char*, sqlite3_int64); */ import "C" import ( "database/sql" "database/sql/driver" "errors" "fmt" "io" "net/url" "reflect" "runtime" "strconv" "strings" "sync" "time" "unsafe" "golang.org/x/net/context" ) // SQLiteTimestampFormats is timestamp formats understood by both this module // and SQLite. The first format in the slice will be used when saving time // values into the database. When parsing a string from a timestamp or datetime // column, the formats are tried in order. var SQLiteTimestampFormats = []string{ // By default, store timestamps with whatever timezone they come with. // When parsed, they will be returned with the same timezone. "2006-01-02 15:04:05.999999999-07:00", "2006-01-02T15:04:05.999999999-07:00", "2006-01-02 15:04:05.999999999", "2006-01-02T15:04:05.999999999", "2006-01-02 15:04:05", "2006-01-02T15:04:05", "2006-01-02 15:04", "2006-01-02T15:04", "2006-01-02", } func init() { sql.Register("sqlite3", &SQLiteDriver{}) } // Version returns SQLite library version information. func Version() (libVersion string, libVersionNumber int, sourceID string) { libVersion = C.GoString(C.sqlite3_libversion()) libVersionNumber = int(C.sqlite3_libversion_number()) sourceID = C.GoString(C.sqlite3_sourceid()) return libVersion, libVersionNumber, sourceID } const ( SQLITE_DELETE = C.SQLITE_DELETE SQLITE_INSERT = C.SQLITE_INSERT SQLITE_UPDATE = C.SQLITE_UPDATE ) // SQLiteDriver implement sql.Driver. type SQLiteDriver struct { Extensions []string ConnectHook func(*SQLiteConn) error } // SQLiteConn implement sql.Conn. type SQLiteConn struct { dbMu sync.Mutex db *C.sqlite3 loc *time.Location txlock string funcs []*functionInfo aggregators []*aggInfo } // SQLiteTx implemen sql.Tx. type SQLiteTx struct { c *SQLiteConn } // SQLiteStmt implement sql.Stmt. type SQLiteStmt struct { c *SQLiteConn s *C.sqlite3_stmt t string closed bool cls bool } // SQLiteResult implement sql.Result. type SQLiteResult struct { id int64 changes int64 } // SQLiteRows implement sql.Rows. type SQLiteRows struct { s *SQLiteStmt nc int cols []string decltype []string cls bool done chan struct{} } type functionInfo struct { f reflect.Value argConverters []callbackArgConverter variadicConverter callbackArgConverter retConverter callbackRetConverter } func (fi *functionInfo) Call(ctx *C.sqlite3_context, argv []*C.sqlite3_value) { args, err := callbackConvertArgs(argv, fi.argConverters, fi.variadicConverter) if err != nil { callbackError(ctx, err) return } ret := fi.f.Call(args) if len(ret) == 2 && ret[1].Interface() != nil { callbackError(ctx, ret[1].Interface().(error)) return } err = fi.retConverter(ctx, ret[0]) if err != nil { callbackError(ctx, err) return } } type aggInfo struct { constructor reflect.Value // Active aggregator objects for aggregations in flight. The // aggregators are indexed by a counter stored in the aggregation // user data space provided by sqlite. active map[int64]reflect.Value next int64 stepArgConverters []callbackArgConverter stepVariadicConverter callbackArgConverter doneRetConverter callbackRetConverter } func (ai *aggInfo) agg(ctx *C.sqlite3_context) (int64, reflect.Value, error) { aggIdx := (*int64)(C.sqlite3_aggregate_context(ctx, C.int(8))) if *aggIdx == 0 { *aggIdx = ai.next ret := ai.constructor.Call(nil) if len(ret) == 2 && ret[1].Interface() != nil { return 0, reflect.Value{}, ret[1].Interface().(error) } if ret[0].IsNil() { return 0, reflect.Value{}, errors.New("aggregator constructor returned nil state") } ai.next++ ai.active[*aggIdx] = ret[0] } return *aggIdx, ai.active[*aggIdx], nil } func (ai *aggInfo) Step(ctx *C.sqlite3_context, argv []*C.sqlite3_value) { _, agg, err := ai.agg(ctx) if err != nil { callbackError(ctx, err) return } args, err := callbackConvertArgs(argv, ai.stepArgConverters, ai.stepVariadicConverter) if err != nil { callbackError(ctx, err) return } ret := agg.MethodByName("Step").Call(args) if len(ret) == 1 && ret[0].Interface() != nil { callbackError(ctx, ret[0].Interface().(error)) return } } func (ai *aggInfo) Done(ctx *C.sqlite3_context) { idx, agg, err := ai.agg(ctx) if err != nil { callbackError(ctx, err) return } defer func() { delete(ai.active, idx) }() ret := agg.MethodByName("Done").Call(nil) if len(ret) == 2 && ret[1].Interface() != nil { callbackError(ctx, ret[1].Interface().(error)) return } err = ai.doneRetConverter(ctx, ret[0]) if err != nil { callbackError(ctx, err) return } } // Commit transaction. func (tx *SQLiteTx) Commit() error { _, err := tx.c.exec(context.Background(), "COMMIT", nil) if err != nil && err.(Error).Code == C.SQLITE_BUSY { // sqlite3 will leave the transaction open in this scenario. // However, database/sql considers the transaction complete once we // return from Commit() - we must clean up to honour its semantics. tx.c.exec(context.Background(), "ROLLBACK", nil) } return err } // Rollback transaction. func (tx *SQLiteTx) Rollback() error { _, err := tx.c.exec(context.Background(), "ROLLBACK", nil) return err } // RegisterCommitHook sets the commit hook for a connection. // // If the callback returns non-zero the transaction will become a rollback. // // If there is an existing commit hook for this connection, it will be // removed. If callback is nil the existing hook (if any) will be removed // without creating a new one. func (c *SQLiteConn) RegisterCommitHook(callback func() int) { if callback == nil { C.sqlite3_commit_hook(c.db, nil, nil) } else { C.sqlite3_commit_hook(c.db, (*[0]byte)(unsafe.Pointer(C.commitHookTrampoline)), unsafe.Pointer(newHandle(c, callback))) } } // RegisterRollbackHook sets the rollback hook for a connection. // // If there is an existing rollback hook for this connection, it will be // removed. If callback is nil the existing hook (if any) will be removed // without creating a new one. func (c *SQLiteConn) RegisterRollbackHook(callback func()) { if callback == nil { C.sqlite3_rollback_hook(c.db, nil, nil) } else { C.sqlite3_rollback_hook(c.db, (*[0]byte)(unsafe.Pointer(C.rollbackHookTrampoline)), unsafe.Pointer(newHandle(c, callback))) } } // RegisterUpdateHook sets the update hook for a connection. // // The parameters to the callback are the operation (one of the constants // SQLITE_INSERT, SQLITE_DELETE, or SQLITE_UPDATE), the database name, the // table name, and the rowid. // // If there is an existing update hook for this connection, it will be // removed. If callback is nil the existing hook (if any) will be removed // without creating a new one. func (c *SQLiteConn) RegisterUpdateHook(callback func(int, string, string, int64)) { if callback == nil { C.sqlite3_update_hook(c.db, nil, nil) } else { C.sqlite3_update_hook(c.db, (*[0]byte)(unsafe.Pointer(C.updateHookTrampoline)), unsafe.Pointer(newHandle(c, callback))) } } // RegisterFunc makes a Go function available as a SQLite function. // // The Go function can have arguments of the following types: any // numeric type except complex, bool, []byte, string and // interface{}. interface{} arguments are given the direct translation // of the SQLite data type: int64 for INTEGER, float64 for FLOAT, // []byte for BLOB, string for TEXT. // // The function can additionally be variadic, as long as the type of // the variadic argument is one of the above. // // If pure is true. SQLite will assume that the function's return // value depends only on its inputs, and make more aggressive // optimizations in its queries. // // See _example/go_custom_funcs for a detailed example. func (c *SQLiteConn) RegisterFunc(name string, impl interface{}, pure bool) error { var fi functionInfo fi.f = reflect.ValueOf(impl) t := fi.f.Type() if t.Kind() != reflect.Func { return errors.New("Non-function passed to RegisterFunc") } if t.NumOut() != 1 && t.NumOut() != 2 { return errors.New("SQLite functions must return 1 or 2 values") } if t.NumOut() == 2 && !t.Out(1).Implements(reflect.TypeOf((*error)(nil)).Elem()) { return errors.New("Second return value of SQLite function must be error") } numArgs := t.NumIn() if t.IsVariadic() { numArgs-- } for i := 0; i < numArgs; i++ { conv, err := callbackArg(t.In(i)) if err != nil { return err } fi.argConverters = append(fi.argConverters, conv) } if t.IsVariadic() { conv, err := callbackArg(t.In(numArgs).Elem()) if err != nil { return err } fi.variadicConverter = conv // Pass -1 to sqlite so that it allows any number of // arguments. The call helper verifies that the minimum number // of arguments is present for variadic functions. numArgs = -1 } conv, err := callbackRet(t.Out(0)) if err != nil { return err } fi.retConverter = conv // fi must outlast the database connection, or we'll have dangling pointers. c.funcs = append(c.funcs, &fi) cname := C.CString(name) defer C.free(unsafe.Pointer(cname)) opts := C.SQLITE_UTF8 if pure { opts |= C.SQLITE_DETERMINISTIC } rv := sqlite3CreateFunction(c.db, cname, C.int(numArgs), C.int(opts), newHandle(c, &fi), C.callbackTrampoline, nil, nil) if rv != C.SQLITE_OK { return c.lastError() } return nil } func sqlite3CreateFunction(db *C.sqlite3, zFunctionName *C.char, nArg C.int, eTextRep C.int, pApp uintptr, xFunc unsafe.Pointer, xStep unsafe.Pointer, xFinal unsafe.Pointer) C.int { return C._sqlite3_create_function(db, zFunctionName, nArg, eTextRep, C.uintptr_t(pApp), (*[0]byte)(unsafe.Pointer(xFunc)), (*[0]byte)(unsafe.Pointer(xStep)), (*[0]byte)(unsafe.Pointer(xFinal))) } // AutoCommit return which currently auto commit or not. func (c *SQLiteConn) AutoCommit() bool { return int(C.sqlite3_get_autocommit(c.db)) != 0 } func (c *SQLiteConn) lastError() error { return lastError(c.db) } func lastError(db *C.sqlite3) error { rv := C.sqlite3_errcode(db) if rv == C.SQLITE_OK { return nil } return Error{ Code: ErrNo(rv), ExtendedCode: ErrNoExtended(C.sqlite3_extended_errcode(db)), err: C.GoString(C.sqlite3_errmsg(db)), } } // Exec implements Execer. func (c *SQLiteConn) Exec(query string, args []driver.Value) (driver.Result, error) { list := make([]namedValue, len(args)) for i, v := range args { list[i] = namedValue{ Ordinal: i + 1, Value: v, } } return c.exec(context.Background(), query, list) } func (c *SQLiteConn) exec(ctx context.Context, query string, args []namedValue) (driver.Result, error) { start := 0 for { s, err := c.prepare(ctx, query) if err != nil { return nil, err } var res driver.Result if s.(*SQLiteStmt).s != nil { na := s.NumInput() if len(args) < na { s.Close() return nil, fmt.Errorf("not enough args to execute query: want %d got %d", na, len(args)) } for i := 0; i < na; i++ { args[i].Ordinal -= start } res, err = s.(*SQLiteStmt).exec(ctx, args[:na]) if err != nil && err != driver.ErrSkip { s.Close() return nil, err } args = args[na:] start += na } tail := s.(*SQLiteStmt).t s.Close() if tail == "" { return res, nil } query = tail } } type namedValue struct { Name string Ordinal int Value driver.Value } // Query implements Queryer. func (c *SQLiteConn) Query(query string, args []driver.Value) (driver.Rows, error) { list := make([]namedValue, len(args)) for i, v := range args { list[i] = namedValue{ Ordinal: i + 1, Value: v, } } return c.query(context.Background(), query, list) } func (c *SQLiteConn) query(ctx context.Context, query string, args []namedValue) (driver.Rows, error) { start := 0 for { s, err := c.prepare(ctx, query) if err != nil { return nil, err } s.(*SQLiteStmt).cls = true na := s.NumInput() if len(args) < na { return nil, fmt.Errorf("not enough args to execute query: want %d got %d", na, len(args)) } for i := 0; i < na; i++ { args[i].Ordinal -= start } rows, err := s.(*SQLiteStmt).query(ctx, args[:na]) if err != nil && err != driver.ErrSkip { s.Close() return rows, err } args = args[na:] start += na tail := s.(*SQLiteStmt).t if tail == "" { return rows, nil } rows.Close() s.Close() query = tail } } // Begin transaction. func (c *SQLiteConn) Begin() (driver.Tx, error) { return c.begin(context.Background()) } func (c *SQLiteConn) begin(ctx context.Context) (driver.Tx, error) { if _, err := c.exec(ctx, c.txlock, nil); err != nil { return nil, err } return &SQLiteTx{c}, nil } func errorString(err Error) string { return C.GoString(C.sqlite3_errstr(C.int(err.Code))) } // Open database and return a new connection. // You can specify a DSN string using a URI as the filename. // test.db // file:test.db?cache=shared&mode=memory // :memory: // file::memory: // go-sqlite3 adds the following query parameters to those used by SQLite: // _loc=XXX // Specify location of time format. It's possible to specify "auto". // _busy_timeout=XXX // Specify value for sqlite3_busy_timeout. // _txlock=XXX // Specify locking behavior for transactions. XXX can be "immediate", // "deferred", "exclusive". // _foreign_keys=X // Enable or disable enforcement of foreign keys. X can be 1 or 0. func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) { if C.sqlite3_threadsafe() == 0 { return nil, errors.New("sqlite library was not compiled for thread-safe operation") } var loc *time.Location txlock := "BEGIN" busyTimeout := 5000 foreignKeys := -1 pos := strings.IndexRune(dsn, '?') if pos >= 1 { params, err := url.ParseQuery(dsn[pos+1:]) if err != nil { return nil, err } // _loc if val := params.Get("_loc"); val != "" { if val == "auto" { loc = time.Local } else { loc, err = time.LoadLocation(val) if err != nil { return nil, fmt.Errorf("Invalid _loc: %v: %v", val, err) } } } // _busy_timeout if val := params.Get("_busy_timeout"); val != "" { iv, err := strconv.ParseInt(val, 10, 64) if err != nil { return nil, fmt.Errorf("Invalid _busy_timeout: %v: %v", val, err) } busyTimeout = int(iv) } // _txlock if val := params.Get("_txlock"); val != "" { switch val { case "immediate": txlock = "BEGIN IMMEDIATE" case "exclusive": txlock = "BEGIN EXCLUSIVE" case "deferred": txlock = "BEGIN" default: return nil, fmt.Errorf("Invalid _txlock: %v", val) } } // _foreign_keys if val := params.Get("_foreign_keys"); val != "" { switch val { case "1": foreignKeys = 1 case "0": foreignKeys = 0 default: return nil, fmt.Errorf("Invalid _foreign_keys: %v", val) } } if !strings.HasPrefix(dsn, "file:") { dsn = dsn[:pos] } } var db *C.sqlite3 name := C.CString(dsn) defer C.free(unsafe.Pointer(name)) rv := C._sqlite3_open_v2(name, &db, C.SQLITE_OPEN_FULLMUTEX| C.SQLITE_OPEN_READWRITE| C.SQLITE_OPEN_CREATE, nil) if rv != 0 { return nil, Error{Code: ErrNo(rv)} } if db == nil { return nil, errors.New("sqlite succeeded without returning a database") } rv = C.sqlite3_busy_timeout(db, C.int(busyTimeout)) if rv != C.SQLITE_OK { C.sqlite3_close_v2(db) return nil, Error{Code: ErrNo(rv)} } exec := func(s string) error { cs := C.CString(s) rv := C.sqlite3_exec(db, cs, nil, nil, nil) C.free(unsafe.Pointer(cs)) if rv != C.SQLITE_OK { return lastError(db) } return nil } if foreignKeys == 0 { if err := exec("PRAGMA foreign_keys = OFF;"); err != nil { C.sqlite3_close_v2(db) return nil, err } } else if foreignKeys == 1 { if err := exec("PRAGMA foreign_keys = ON;"); err != nil { C.sqlite3_close_v2(db) return nil, err } } conn := &SQLiteConn{db: db, loc: loc, txlock: txlock} if len(d.Extensions) > 0 { if err := conn.loadExtensions(d.Extensions); err != nil { conn.Close() return nil, err } } if d.ConnectHook != nil { if err := d.ConnectHook(conn); err != nil { conn.Close() return nil, err } } runtime.SetFinalizer(conn, (*SQLiteConn).Close) return conn, nil } // Close the connection. func (c *SQLiteConn) Close() error { rv := C.sqlite3_close_v2(c.db) if rv != C.SQLITE_OK { return c.lastError() } deleteHandles(c) c.dbMu.Lock() c.db = nil c.dbMu.Unlock() runtime.SetFinalizer(c, nil) return nil } func (c *SQLiteConn) dbConnOpen() bool { if c == nil { return false } c.dbMu.Lock() defer c.dbMu.Unlock() return c.db != nil } // Prepare the query string. Return a new statement. func (c *SQLiteConn) Prepare(query string) (driver.Stmt, error) { return c.prepare(context.Background(), query) } func (c *SQLiteConn) prepare(ctx context.Context, query string) (driver.Stmt, error) { pquery := C.CString(query) defer C.free(unsafe.Pointer(pquery)) var s *C.sqlite3_stmt var tail *C.char rv := C.sqlite3_prepare_v2(c.db, pquery, -1, &s, &tail) if rv != C.SQLITE_OK { return nil, c.lastError() } var t string if tail != nil && *tail != '\000' { t = strings.TrimSpace(C.GoString(tail)) } ss := &SQLiteStmt{c: c, s: s, t: t} runtime.SetFinalizer(ss, (*SQLiteStmt).Close) return ss, nil } // Close the statement. func (s *SQLiteStmt) Close() error { if s.closed { return nil } s.closed = true if !s.c.dbConnOpen() { return errors.New("sqlite statement with already closed database connection") } rv := C.sqlite3_finalize(s.s) if rv != C.SQLITE_OK { return s.c.lastError() } runtime.SetFinalizer(s, nil) return nil } // NumInput return a number of parameters. func (s *SQLiteStmt) NumInput() int { return int(C.sqlite3_bind_parameter_count(s.s)) } type bindArg struct { n int v driver.Value } var placeHolder = []byte{0} func (s *SQLiteStmt) bind(args []namedValue) error { rv := C.sqlite3_reset(s.s) if rv != C.SQLITE_ROW && rv != C.SQLITE_OK && rv != C.SQLITE_DONE { return s.c.lastError() } for i, v := range args { if v.Name != "" { cname := C.CString(":" + v.Name) args[i].Ordinal = int(C.sqlite3_bind_parameter_index(s.s, cname)) C.free(unsafe.Pointer(cname)) } } for _, arg := range args { n := C.int(arg.Ordinal) switch v := arg.Value.(type) { case nil: rv = C.sqlite3_bind_null(s.s, n) case string: if len(v) == 0 { rv = C._sqlite3_bind_text(s.s, n, (*C.char)(unsafe.Pointer(&placeHolder[0])), C.int(0)) } else { b := []byte(v) rv = C._sqlite3_bind_text(s.s, n, (*C.char)(unsafe.Pointer(&b[0])), C.int(len(b))) } case int64: rv = C.sqlite3_bind_int64(s.s, n, C.sqlite3_int64(v)) case bool: if bool(v) { rv = C.sqlite3_bind_int(s.s, n, 1) } else { rv = C.sqlite3_bind_int(s.s, n, 0) } case float64: rv = C.sqlite3_bind_double(s.s, n, C.double(v)) case []byte: if len(v) == 0 { v = placeHolder } rv = C._sqlite3_bind_blob(s.s, n, unsafe.Pointer(&v[0]), C.int(len(v))) case time.Time: b := []byte(v.Format(SQLiteTimestampFormats[0])) rv = C._sqlite3_bind_text(s.s, n, (*C.char)(unsafe.Pointer(&b[0])), C.int(len(b))) } if rv != C.SQLITE_OK { return s.c.lastError() } } return nil } // Query the statement with arguments. Return records. func (s *SQLiteStmt) Query(args []driver.Value) (driver.Rows, error) { list := make([]namedValue, len(args)) for i, v := range args { list[i] = namedValue{ Ordinal: i + 1, Value: v, } } return s.query(context.Background(), list) } func (s *SQLiteStmt) query(ctx context.Context, args []namedValue) (driver.Rows, error) { if err := s.bind(args); err != nil { return nil, err } rows := &SQLiteRows{ s: s, nc: int(C.sqlite3_column_count(s.s)), cols: nil, decltype: nil, cls: s.cls, done: make(chan struct{}), } go func(db *C.sqlite3) { select { case <-ctx.Done(): select { case <-rows.done: default: C.sqlite3_interrupt(db) rows.Close() } case <-rows.done: } }(s.c.db) return rows, nil } // LastInsertId teturn last inserted ID. func (r *SQLiteResult) LastInsertId() (int64, error) { return r.id, nil } // RowsAffected return how many rows affected. func (r *SQLiteResult) RowsAffected() (int64, error) { return r.changes, nil } // Exec execute the statement with arguments. Return result object. func (s *SQLiteStmt) Exec(args []driver.Value) (driver.Result, error) { list := make([]namedValue, len(args)) for i, v := range args { list[i] = namedValue{ Ordinal: i + 1, Value: v, } } return s.exec(context.Background(), list) } func (s *SQLiteStmt) exec(ctx context.Context, args []namedValue) (driver.Result, error) { if err := s.bind(args); err != nil { C.sqlite3_reset(s.s) C.sqlite3_clear_bindings(s.s) return nil, err } done := make(chan struct{}) defer close(done) go func(db *C.sqlite3) { select { case <-ctx.Done(): C.sqlite3_interrupt(db) case <-done: } }(s.c.db) var rowid, changes C.longlong rv := C._sqlite3_step(s.s, &rowid, &changes) if rv != C.SQLITE_ROW && rv != C.SQLITE_OK && rv != C.SQLITE_DONE { err := s.c.lastError() C.sqlite3_reset(s.s) C.sqlite3_clear_bindings(s.s) return nil, err } return &SQLiteResult{id: int64(rowid), changes: int64(changes)}, nil } // Close the rows. func (rc *SQLiteRows) Close() error { if rc.s.closed { return nil } if rc.done != nil { close(rc.done) } if rc.cls { return rc.s.Close() } rv := C.sqlite3_reset(rc.s.s) if rv != C.SQLITE_OK { return rc.s.c.lastError() } return nil } // Columns return column names. func (rc *SQLiteRows) Columns() []string { if rc.nc != len(rc.cols) { rc.cols = make([]string, rc.nc) for i := 0; i < rc.nc; i++ { rc.cols[i] = C.GoString(C.sqlite3_column_name(rc.s.s, C.int(i))) } } return rc.cols } // DeclTypes return column types. func (rc *SQLiteRows) DeclTypes() []string { if rc.decltype == nil { rc.decltype = make([]string, rc.nc) for i := 0; i < rc.nc; i++ { rc.decltype[i] = strings.ToLower(C.GoString(C.sqlite3_column_decltype(rc.s.s, C.int(i)))) } } return rc.decltype } // Next move cursor to next. func (rc *SQLiteRows) Next(dest []driver.Value) error { rv := C.sqlite3_step(rc.s.s) if rv == C.SQLITE_DONE { return io.EOF } if rv != C.SQLITE_ROW { rv = C.sqlite3_reset(rc.s.s) if rv != C.SQLITE_OK { return rc.s.c.lastError() } return nil } rc.DeclTypes() for i := range dest { switch C.sqlite3_column_type(rc.s.s, C.int(i)) { case C.SQLITE_INTEGER: val := int64(C.sqlite3_column_int64(rc.s.s, C.int(i))) switch rc.decltype[i] { case "timestamp", "datetime", "date": var t time.Time // Assume a millisecond unix timestamp if it's 13 digits -- too // large to be a reasonable timestamp in seconds. if val > 1e12 || val < -1e12 { val *= int64(time.Millisecond) // convert ms to nsec t = time.Unix(0, val) } else { t = time.Unix(val, 0) } t = t.UTC() if rc.s.c.loc != nil { t = t.In(rc.s.c.loc) } dest[i] = t case "boolean": dest[i] = val > 0 default: dest[i] = val } case C.SQLITE_FLOAT: dest[i] = float64(C.sqlite3_column_double(rc.s.s, C.int(i))) case C.SQLITE_BLOB: p := C.sqlite3_column_blob(rc.s.s, C.int(i)) if p == nil { dest[i] = nil continue } n := int(C.sqlite3_column_bytes(rc.s.s, C.int(i))) switch dest[i].(type) { case sql.RawBytes: dest[i] = (*[1 << 30]byte)(unsafe.Pointer(p))[0:n] default: slice := make([]byte, n) copy(slice[:], (*[1 << 30]byte)(unsafe.Pointer(p))[0:n]) dest[i] = slice } case C.SQLITE_NULL: dest[i] = nil case C.SQLITE_TEXT: var err error var timeVal time.Time n := int(C.sqlite3_column_bytes(rc.s.s, C.int(i))) s := C.GoStringN((*C.char)(unsafe.Pointer(C.sqlite3_column_text(rc.s.s, C.int(i)))), C.int(n)) switch rc.decltype[i] { case "timestamp", "datetime", "date": var t time.Time s = strings.TrimSuffix(s, "Z") for _, format := range SQLiteTimestampFormats { if timeVal, err = time.ParseInLocation(format, s, time.UTC); err == nil { t = timeVal break } } if err != nil { // The column is a time value, so return the zero time on parse failure. t = time.Time{} } if rc.s.c.loc != nil { t = t.In(rc.s.c.loc) } dest[i] = t default: dest[i] = []byte(s) } } } return nil }