diff options
Diffstat (limited to 'sqlite3.go')
| -rw-r--r-- | sqlite3.go | 360 |
1 files changed, 331 insertions, 29 deletions
@@ -8,7 +8,7 @@ package sqlite3 /* #cgo CFLAGS: -std=gnu99 #cgo CFLAGS: -DSQLITE_ENABLE_RTREE -DSQLITE_THREADSAFE -#cgo CFLAGS: -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS +#cgo CFLAGS: -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_ENABLE_FTS4_UNICODE61 #include <sqlite3-binding.h> #include <stdlib.h> #include <string.h> @@ -48,24 +48,35 @@ _sqlite3_bind_blob(sqlite3_stmt *stmt, int n, void *p, int np) { #include <stdint.h> static int -_sqlite3_exec(sqlite3* db, const char* pcmd, long* rowid, long* changes) +_sqlite3_exec(sqlite3* db, const char* pcmd, long long* rowid, long long* changes) { int rv = sqlite3_exec(db, pcmd, 0, 0, 0); - *rowid = (long) sqlite3_last_insert_rowid(db); - *changes = (long) sqlite3_changes(db); + *rowid = (long long) sqlite3_last_insert_rowid(db); + *changes = (long long) sqlite3_changes(db); return rv; } static int -_sqlite3_step(sqlite3_stmt* stmt, long* rowid, long* changes) +_sqlite3_step(sqlite3_stmt* stmt, long long* rowid, long long* changes) { int rv = sqlite3_step(stmt); sqlite3* db = sqlite3_db_handle(stmt); - *rowid = (long) sqlite3_last_insert_rowid(db); - *changes = (long) sqlite3_changes(db); + *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); +} + +void callbackTrampoline(sqlite3_context*, int, sqlite3_value**); +void stepTrampoline(sqlite3_context*, int, sqlite3_value**); +void doneTrampoline(sqlite3_context*); */ import "C" import ( @@ -75,6 +86,7 @@ import ( "fmt" "io" "net/url" + "reflect" "runtime" "strconv" "strings" @@ -117,9 +129,11 @@ type SQLiteDriver struct { // Conn struct. type SQLiteConn struct { - db *C.sqlite3 - loc *time.Location - txlock string + db *C.sqlite3 + loc *time.Location + txlock string + funcs []*functionInfo + aggregators []*aggInfo } // Tx struct. @@ -153,6 +167,107 @@ type SQLiteRows struct { cls bool } +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("COMMIT") @@ -165,6 +280,208 @@ func (tx *SQLiteTx) Rollback() error { return err } +// 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 := C.sqlite3_create_function(c.db, cname, C.int(numArgs), C.int(opts), unsafe.Pointer(&fi), (*[0]byte)(unsafe.Pointer(C.callbackTrampoline)), nil, nil) + if rv != C.SQLITE_OK { + return c.lastError() + } + return nil +} + +// RegisterAggregator makes a Go type available as a SQLite aggregation function. +// +// Because aggregation is incremental, it's implemented in Go with a +// type that has 2 methods: func Step(values) accumulates one row of +// data into the accumulator, and func Done() ret finalizes and +// returns the aggregate value. "values" and "ret" may be any type +// supported by RegisterFunc. +// +// RegisterAggregator takes as implementation a constructor function +// that constructs an instance of the aggregator type each time an +// aggregation begins. The constructor must return a pointer to a +// type, or an interface that implements Step() and Done(). +// +// The constructor function and the Step/Done methods may optionally +// return an error in addition to their other return values. +// +// See _example/go_custom_funcs for a detailed example. +func (c *SQLiteConn) RegisterAggregator(name string, impl interface{}, pure bool) error { + var ai aggInfo + ai.constructor = reflect.ValueOf(impl) + t := ai.constructor.Type() + if t.Kind() != reflect.Func { + return errors.New("non-function passed to RegisterAggregator") + } + if t.NumOut() != 1 && t.NumOut() != 2 { + return errors.New("SQLite aggregator constructors 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") + } + if t.NumIn() != 0 { + return errors.New("SQLite aggregator constructors must not have arguments") + } + + agg := t.Out(0) + switch agg.Kind() { + case reflect.Ptr, reflect.Interface: + default: + return errors.New("SQlite aggregator constructor must return a pointer object") + } + stepFn, found := agg.MethodByName("Step") + if !found { + return errors.New("SQlite aggregator doesn't have a Step() function") + } + step := stepFn.Type + if step.NumOut() != 0 && step.NumOut() != 1 { + return errors.New("SQlite aggregator Step() function must return 0 or 1 values") + } + if step.NumOut() == 1 && !step.Out(0).Implements(reflect.TypeOf((*error)(nil)).Elem()) { + return errors.New("type of SQlite aggregator Step() return value must be error") + } + + stepNArgs := step.NumIn() + start := 0 + if agg.Kind() == reflect.Ptr { + // Skip over the method receiver + stepNArgs-- + start++ + } + if step.IsVariadic() { + stepNArgs-- + } + for i := start; i < start+stepNArgs; i++ { + conv, err := callbackArg(step.In(i)) + if err != nil { + return err + } + ai.stepArgConverters = append(ai.stepArgConverters, conv) + } + if step.IsVariadic() { + conv, err := callbackArg(t.In(start + stepNArgs).Elem()) + if err != nil { + return err + } + ai.stepVariadicConverter = 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. + stepNArgs = -1 + } + + doneFn, found := agg.MethodByName("Done") + if !found { + return errors.New("SQlite aggregator doesn't have a Done() function") + } + done := doneFn.Type + doneNArgs := done.NumIn() + if agg.Kind() == reflect.Ptr { + // Skip over the method receiver + doneNArgs-- + } + if doneNArgs != 0 { + return errors.New("SQlite aggregator Done() function must have no arguments") + } + if done.NumOut() != 1 && done.NumOut() != 2 { + return errors.New("SQLite aggregator Done() function must return 1 or 2 values") + } + if done.NumOut() == 2 && !done.Out(1).Implements(reflect.TypeOf((*error)(nil)).Elem()) { + return errors.New("second return value of SQLite aggregator Done() function must be error") + } + + conv, err := callbackRet(done.Out(0)) + if err != nil { + return err + } + ai.doneRetConverter = conv + ai.active = make(map[int64]reflect.Value) + ai.next = 1 + + // ai must outlast the database connection, or we'll have dangling pointers. + c.aggregators = append(c.aggregators, &ai) + + cname := C.CString(name) + defer C.free(unsafe.Pointer(cname)) + opts := C.SQLITE_UTF8 + if pure { + opts |= C.SQLITE_DETERMINISTIC + } + rv := C.sqlite3_create_function(c.db, cname, C.int(stepNArgs), C.int(opts), unsafe.Pointer(&ai), nil, (*[0]byte)(unsafe.Pointer(C.stepTrampoline)), (*[0]byte)(unsafe.Pointer(C.doneTrampoline))) + if rv != C.SQLITE_OK { + return c.lastError() + } + return nil +} + // AutoCommit return which currently auto commit or not. func (c *SQLiteConn) AutoCommit() bool { return int(C.sqlite3_get_autocommit(c.db)) != 0 @@ -243,7 +560,7 @@ func (c *SQLiteConn) exec(cmd string) (driver.Result, error) { pcmd := C.CString(cmd) defer C.free(unsafe.Pointer(pcmd)) - var rowid, changes C.long + var rowid, changes C.longlong rv := C._sqlite3_exec(c.db, pcmd, &rowid, &changes) if rv != C.SQLITE_OK { return nil, c.lastError() @@ -355,23 +672,8 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) { conn := &SQLiteConn{db: db, loc: loc, txlock: txlock} if len(d.Extensions) > 0 { - rv = C.sqlite3_enable_load_extension(db, 1) - if rv != C.SQLITE_OK { - return nil, errors.New(C.GoString(C.sqlite3_errmsg(db))) - } - - for _, extension := range d.Extensions { - cext := C.CString(extension) - defer C.free(unsafe.Pointer(cext)) - rv = C.sqlite3_load_extension(db, cext, nil, nil) - if rv != C.SQLITE_OK { - return nil, errors.New(C.GoString(C.sqlite3_errmsg(db))) - } - } - - rv = C.sqlite3_enable_load_extension(db, 0) - if rv != C.SQLITE_OK { - return nil, errors.New(C.GoString(C.sqlite3_errmsg(db))) + if err := conn.loadExtensions(d.Extensions); err != nil { + return nil, err } } @@ -536,7 +838,7 @@ func (s *SQLiteStmt) Exec(args []driver.Value) (driver.Result, error) { C.sqlite3_clear_bindings(s.s) return nil, err } - var rowid, changes C.long + 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() |