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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sql
import (
"context"
"database/sql/driver"
"errors"
"fmt"
"math/rand"
"reflect"
"runtime"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
)
func init() {
type dbConn struct {
db *DB
c *driverConn
}
freedFrom := make(map[dbConn]string)
var mu sync.Mutex
getFreedFrom := func(c dbConn) string {
mu.Lock()
defer mu.Unlock()
return freedFrom[c]
}
setFreedFrom := func(c dbConn, s string) {
mu.Lock()
defer mu.Unlock()
freedFrom[c] = s
}
putConnHook = func(db *DB, c *driverConn) {
idx := -1
for i, v := range db.freeConn {
if v == c {
idx = i
break
}
}
if idx >= 0 {
// print before panic, as panic may get lost due to conflicting panic
// (all goroutines asleep) elsewhere, since we might not unlock
// the mutex in freeConn here.
println("double free of conn. conflicts are:\nA) " + getFreedFrom(dbConn{db, c}) + "\n\nand\nB) " + stack())
panic("double free of conn.")
}
setFreedFrom(dbConn{db, c}, stack())
}
}
// pollDuration is an arbitrary interval to wait between checks when polling for
// a condition to occur.
const pollDuration = 5 * time.Millisecond
const fakeDBName = "foo"
var chrisBirthday = time.Unix(123456789, 0)
func newTestDB(t testing.TB, name string) *DB {
return newTestDBConnector(t, &fakeConnector{name: fakeDBName}, name)
}
func newTestDBConnector(t testing.TB, fc *fakeConnector, name string) *DB {
fc.name = fakeDBName
db := OpenDB(fc)
if _, err := db.Exec("WIPE"); err != nil {
t.Fatalf("exec wipe: %v", err)
}
if name == "people" {
exec(t, db, "CREATE|people|name=string,age=int32,photo=blob,dead=bool,bdate=datetime")
exec(t, db, "INSERT|people|name=Alice,age=?,photo=APHOTO", 1)
exec(t, db, "INSERT|people|name=Bob,age=?,photo=BPHOTO", 2)
exec(t, db, "INSERT|people|name=Chris,age=?,photo=CPHOTO,bdate=?", 3, chrisBirthday)
}
if name == "magicquery" {
// Magic table name and column, known by fakedb_test.go.
exec(t, db, "CREATE|magicquery|op=string,millis=int32")
exec(t, db, "INSERT|magicquery|op=sleep,millis=10")
}
if name == "tx_status" {
// Magic table name and column, known by fakedb_test.go.
exec(t, db, "CREATE|tx_status|tx_status=string")
exec(t, db, "INSERT|tx_status|tx_status=invalid")
}
return db
}
func TestOpenDB(t *testing.T) {
db := OpenDB(dsnConnector{dsn: fakeDBName, driver: fdriver})
if db.Driver() != fdriver {
t.Fatalf("OpenDB should return the driver of the Connector")
}
}
func TestDriverPanic(t *testing.T) {
// Test that if driver panics, database/sql does not deadlock.
db, err := Open("test", fakeDBName)
if err != nil {
t.Fatalf("Open: %v", err)
}
expectPanic := func(name string, f func()) {
defer func() {
err := recover()
if err == nil {
t.Fatalf("%s did not panic", name)
}
}()
f()
}
expectPanic("Exec Exec", func() { db.Exec("PANIC|Exec|WIPE") })
exec(t, db, "WIPE") // check not deadlocked
expectPanic("Exec NumInput", func() { db.Exec("PANIC|NumInput|WIPE") })
exec(t, db, "WIPE") // check not deadlocked
expectPanic("Exec Close", func() { db.Exec("PANIC|Close|WIPE") })
exec(t, db, "WIPE") // check not deadlocked
exec(t, db, "PANIC|Query|WIPE") // should run successfully: Exec does not call Query
exec(t, db, "WIPE") // check not deadlocked
exec(t, db, "CREATE|people|name=string,age=int32,photo=blob,dead=bool,bdate=datetime")
expectPanic("Query Query", func() { db.Query("PANIC|Query|SELECT|people|age,name|") })
expectPanic("Query NumInput", func() { db.Query("PANIC|NumInput|SELECT|people|age,name|") })
expectPanic("Query Close", func() {
rows, err := db.Query("PANIC|Close|SELECT|people|age,name|")
if err != nil {
t.Fatal(err)
}
rows.Close()
})
db.Query("PANIC|Exec|SELECT|people|age,name|") // should run successfully: Query does not call Exec
exec(t, db, "WIPE") // check not deadlocked
}
func exec(t testing.TB, db *DB, query string, args ...any) {
t.Helper()
_, err := db.Exec(query, args...)
if err != nil {
t.Fatalf("Exec of %q: %v", query, err)
}
}
func closeDB(t testing.TB, db *DB) {
if e := recover(); e != nil {
fmt.Printf("Panic: %v\n", e)
panic(e)
}
defer setHookpostCloseConn(nil)
setHookpostCloseConn(func(_ *fakeConn, err error) {
if err != nil {
t.Errorf("Error closing fakeConn: %v", err)
}
})
db.mu.Lock()
for i, dc := range db.freeConn {
if n := len(dc.openStmt); n > 0 {
// Just a sanity check. This is legal in
// general, but if we make the tests clean up
// their statements first, then we can safely
// verify this is always zero here, and any
// other value is a leak.
t.Errorf("while closing db, freeConn %d/%d had %d open stmts; want 0", i, len(db.freeConn), n)
}
}
db.mu.Unlock()
err := db.Close()
if err != nil {
t.Fatalf("error closing DB: %v", err)
}
var numOpen int
if !waitCondition(t, func() bool {
numOpen = db.numOpenConns()
return numOpen == 0
}) {
t.Fatalf("%d connections still open after closing DB", numOpen)
}
}
// numPrepares assumes that db has exactly 1 idle conn and returns
// its count of calls to Prepare
func numPrepares(t *testing.T, db *DB) int {
if n := len(db.freeConn); n != 1 {
t.Fatalf("free conns = %d; want 1", n)
}
return db.freeConn[0].ci.(*fakeConn).numPrepare
}
func (db *DB) numDeps() int {
db.mu.Lock()
defer db.mu.Unlock()
return len(db.dep)
}
// Dependencies are closed via a goroutine, so this polls waiting for
// numDeps to fall to want, waiting up to nearly the test's deadline.
func (db *DB) numDepsPoll(t *testing.T, want int) int {
var n int
waitCondition(t, func() bool {
n = db.numDeps()
return n <= want
})
return n
}
func (db *DB) numFreeConns() int {
db.mu.Lock()
defer db.mu.Unlock()
return len(db.freeConn)
}
func (db *DB) numOpenConns() int {
db.mu.Lock()
defer db.mu.Unlock()
return db.numOpen
}
// clearAllConns closes all connections in db.
func (db *DB) clearAllConns(t *testing.T) {
db.SetMaxIdleConns(0)
if g, w := db.numFreeConns(), 0; g != w {
t.Errorf("free conns = %d; want %d", g, w)
}
if n := db.numDepsPoll(t, 0); n > 0 {
t.Errorf("number of dependencies = %d; expected 0", n)
db.dumpDeps(t)
}
}
func (db *DB) dumpDeps(t *testing.T) {
for fc := range db.dep {
db.dumpDep(t, 0, fc, map[finalCloser]bool{})
}
}
func (db *DB) dumpDep(t *testing.T, depth int, dep finalCloser, seen map[finalCloser]bool) {
seen[dep] = true
indent := strings.Repeat(" ", depth)
ds := db.dep[dep]
for k := range ds {
t.Logf("%s%T (%p) waiting for -> %T (%p)", indent, dep, dep, k, k)
if fc, ok := k.(finalCloser); ok {
if !seen[fc] {
db.dumpDep(t, depth+1, fc, seen)
}
}
}
}
func TestQuery(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
prepares0 := numPrepares(t, db)
rows, err := db.Query("SELECT|people|age,name|")
if err != nil {
t.Fatalf("Query: %v", err)
}
type row struct {
age int
name string
}
got := []row{}
for rows.Next() {
var r row
err = rows.Scan(&r.age, &r.name)
if err != nil {
t.Fatalf("Scan: %v", err)
}
got = append(got, r)
}
err = rows.Err()
if err != nil {
t.Fatalf("Err: %v", err)
}
want := []row{
{age: 1, name: "Alice"},
{age: 2, name: "Bob"},
{age: 3, name: "Chris"},
}
if !reflect.DeepEqual(got, want) {
t.Errorf("mismatch.\n got: %#v\nwant: %#v", got, want)
}
// And verify that the final rows.Next() call, which hit EOF,
// also closed the rows connection.
if n := db.numFreeConns(); n != 1 {
t.Fatalf("free conns after query hitting EOF = %d; want 1", n)
}
if prepares := numPrepares(t, db) - prepares0; prepares != 1 {
t.Errorf("executed %d Prepare statements; want 1", prepares)
}
}
// TestQueryContext tests canceling the context while scanning the rows.
func TestQueryContext(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
prepares0 := numPrepares(t, db)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
rows, err := db.QueryContext(ctx, "SELECT|people|age,name|")
if err != nil {
t.Fatalf("Query: %v", err)
}
type row struct {
age int
name string
}
got := []row{}
index := 0
for rows.Next() {
if index == 2 {
cancel()
waitForRowsClose(t, rows)
}
var r row
err = rows.Scan(&r.age, &r.name)
if err != nil {
if index == 2 {
break
}
t.Fatalf("Scan: %v", err)
}
if index == 2 && err != context.Canceled {
t.Fatalf("Scan: %v; want context.Canceled", err)
}
got = append(got, r)
index++
}
select {
case <-ctx.Done():
if err := ctx.Err(); err != context.Canceled {
t.Fatalf("context err = %v; want context.Canceled", err)
}
default:
t.Fatalf("context err = nil; want context.Canceled")
}
want := []row{
{age: 1, name: "Alice"},
{age: 2, name: "Bob"},
}
if !reflect.DeepEqual(got, want) {
t.Errorf("mismatch.\n got: %#v\nwant: %#v", got, want)
}
// And verify that the final rows.Next() call, which hit EOF,
// also closed the rows connection.
waitForRowsClose(t, rows)
waitForFree(t, db, 1)
if prepares := numPrepares(t, db) - prepares0; prepares != 1 {
t.Errorf("executed %d Prepare statements; want 1", prepares)
}
}
func waitCondition(t testing.TB, fn func() bool) bool {
timeout := 5 * time.Second
type deadliner interface {
Deadline() (time.Time, bool)
}
if td, ok := t.(deadliner); ok {
if deadline, ok := td.Deadline(); ok {
timeout = time.Until(deadline)
timeout = timeout * 19 / 20 // Give 5% headroom for cleanup and error-reporting.
}
}
deadline := time.Now().Add(timeout)
for {
if fn() {
return true
}
if time.Until(deadline) < pollDuration {
return false
}
time.Sleep(pollDuration)
}
}
// waitForFree checks db.numFreeConns until either it equals want or
// the maxWait time elapses.
func waitForFree(t *testing.T, db *DB, want int) {
var numFree int
if !waitCondition(t, func() bool {
numFree = db.numFreeConns()
return numFree == want
}) {
t.Fatalf("free conns after hitting EOF = %d; want %d", numFree, want)
}
}
func waitForRowsClose(t *testing.T, rows *Rows) {
if !waitCondition(t, func() bool {
rows.closemu.RLock()
defer rows.closemu.RUnlock()
return rows.closed
}) {
t.Fatal("failed to close rows")
}
}
// TestQueryContextWait ensures that rows and all internal statements are closed when
// a query context is closed during execution.
func TestQueryContextWait(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
prepares0 := numPrepares(t, db)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
// This will trigger the *fakeConn.Prepare method which will take time
// performing the query. The ctxDriverPrepare func will check the context
// after this and close the rows and return an error.
c, err := db.Conn(ctx)
if err != nil {
t.Fatal(err)
}
c.dc.ci.(*fakeConn).waiter = func(c context.Context) {
cancel()
<-ctx.Done()
}
_, err = c.QueryContext(ctx, "SELECT|people|age,name|")
c.Close()
if err != context.Canceled {
t.Fatalf("expected QueryContext to error with context deadline exceeded but returned %v", err)
}
// Verify closed rows connection after error condition.
waitForFree(t, db, 1)
if prepares := numPrepares(t, db) - prepares0; prepares != 1 {
t.Fatalf("executed %d Prepare statements; want 1", prepares)
}
}
// TestTxContextWait tests the transaction behavior when the tx context is canceled
// during execution of the query.
func TestTxContextWait(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
ctx, cancel := context.WithCancel(context.Background())
tx, err := db.BeginTx(ctx, nil)
if err != nil {
t.Fatal(err)
}
tx.keepConnOnRollback = false
tx.dc.ci.(*fakeConn).waiter = func(c context.Context) {
cancel()
<-ctx.Done()
}
// This will trigger the *fakeConn.Prepare method which will take time
// performing the query. The ctxDriverPrepare func will check the context
// after this and close the rows and return an error.
_, err = tx.QueryContext(ctx, "SELECT|people|age,name|")
if err != context.Canceled {
t.Fatalf("expected QueryContext to error with context canceled but returned %v", err)
}
waitForFree(t, db, 0)
}
// TestTxContextWaitNoDiscard is the same as TestTxContextWait, but should not discard
// the final connection.
func TestTxContextWaitNoDiscard(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
ctx, cancel := context.WithTimeout(context.Background(), 15*time.Millisecond)
defer cancel()
tx, err := db.BeginTx(ctx, nil)
if err != nil {
// Guard against the context being canceled before BeginTx completes.
if err == context.DeadlineExceeded {
t.Skip("tx context canceled prior to first use")
}
t.Fatal(err)
}
// This will trigger the *fakeConn.Prepare method which will take time
// performing the query. The ctxDriverPrepare func will check the context
// after this and close the rows and return an error.
_, err = tx.QueryContext(ctx, "WAIT|1s|SELECT|people|age,name|")
if err != context.DeadlineExceeded {
t.Fatalf("expected QueryContext to error with context deadline exceeded but returned %v", err)
}
waitForFree(t, db, 1)
}
// TestUnsupportedOptions checks that the database fails when a driver that
// doesn't implement ConnBeginTx is used with non-default options and an
// un-cancellable context.
func TestUnsupportedOptions(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
_, err := db.BeginTx(context.Background(), &TxOptions{
Isolation: LevelSerializable, ReadOnly: true,
})
if err == nil {
t.Fatal("expected error when using unsupported options, got nil")
}
}
func TestMultiResultSetQuery(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
prepares0 := numPrepares(t, db)
rows, err := db.Query("SELECT|people|age,name|;SELECT|people|name|")
if err != nil {
t.Fatalf("Query: %v", err)
}
type row1 struct {
age int
name string
}
type row2 struct {
name string
}
got1 := []row1{}
for rows.Next() {
var r row1
err = rows.Scan(&r.age, &r.name)
if err != nil {
t.Fatalf("Scan: %v", err)
}
got1 = append(got1, r)
}
err = rows.Err()
if err != nil {
t.Fatalf("Err: %v", err)
}
want1 := []row1{
{age: 1, name: "Alice"},
{age: 2, name: "Bob"},
{age: 3, name: "Chris"},
}
if !reflect.DeepEqual(got1, want1) {
t.Errorf("mismatch.\n got1: %#v\nwant: %#v", got1, want1)
}
if !rows.NextResultSet() {
t.Errorf("expected another result set")
}
got2 := []row2{}
for rows.Next() {
var r row2
err = rows.Scan(&r.name)
if err != nil {
t.Fatalf("Scan: %v", err)
}
got2 = append(got2, r)
}
err = rows.Err()
if err != nil {
t.Fatalf("Err: %v", err)
}
want2 := []row2{
{name: "Alice"},
{name: "Bob"},
{name: "Chris"},
}
if !reflect.DeepEqual(got2, want2) {
t.Errorf("mismatch.\n got: %#v\nwant: %#v", got2, want2)
}
if rows.NextResultSet() {
t.Errorf("expected no more result sets")
}
// And verify that the final rows.Next() call, which hit EOF,
// also closed the rows connection.
waitForFree(t, db, 1)
if prepares := numPrepares(t, db) - prepares0; prepares != 1 {
t.Errorf("executed %d Prepare statements; want 1", prepares)
}
}
func TestQueryNamedArg(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
prepares0 := numPrepares(t, db)
rows, err := db.Query(
// Ensure the name and age parameters only match on placeholder name, not position.
"SELECT|people|age,name|name=?name,age=?age",
Named("age", 2),
Named("name", "Bob"),
)
if err != nil {
t.Fatalf("Query: %v", err)
}
type row struct {
age int
name string
}
got := []row{}
for rows.Next() {
var r row
err = rows.Scan(&r.age, &r.name)
if err != nil {
t.Fatalf("Scan: %v", err)
}
got = append(got, r)
}
err = rows.Err()
if err != nil {
t.Fatalf("Err: %v", err)
}
want := []row{
{age: 2, name: "Bob"},
}
if !reflect.DeepEqual(got, want) {
t.Errorf("mismatch.\n got: %#v\nwant: %#v", got, want)
}
// And verify that the final rows.Next() call, which hit EOF,
// also closed the rows connection.
if n := db.numFreeConns(); n != 1 {
t.Fatalf("free conns after query hitting EOF = %d; want 1", n)
}
if prepares := numPrepares(t, db) - prepares0; prepares != 1 {
t.Errorf("executed %d Prepare statements; want 1", prepares)
}
}
func TestPoolExhaustOnCancel(t *testing.T) {
if testing.Short() {
t.Skip("long test")
}
max := 3
var saturate, saturateDone sync.WaitGroup
saturate.Add(max)
saturateDone.Add(max)
donePing := make(chan bool)
state := 0
// waiter will be called for all queries, including
// initial setup queries. The state is only assigned when
// no queries are made.
//
// Only allow the first batch of queries to finish once the
// second batch of Ping queries have finished.
waiter := func(ctx context.Context) {
switch state {
case 0:
// Nothing. Initial database setup.
case 1:
saturate.Done()
select {
case <-ctx.Done():
case <-donePing:
}
case 2:
}
}
db := newTestDBConnector(t, &fakeConnector{waiter: waiter}, "people")
defer closeDB(t, db)
db.SetMaxOpenConns(max)
// First saturate the connection pool.
// Then start new requests for a connection that is canceled after it is requested.
state = 1
for i := 0; i < max; i++ {
go func() {
rows, err := db.Query("SELECT|people|name,photo|")
if err != nil {
t.Errorf("Query: %v", err)
return
}
rows.Close()
saturateDone.Done()
}()
}
saturate.Wait()
if t.Failed() {
t.FailNow()
}
state = 2
// Now cancel the request while it is waiting.
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
for i := 0; i < max; i++ {
ctxReq, cancelReq := context.WithCancel(ctx)
go func() {
time.Sleep(100 * time.Millisecond)
cancelReq()
}()
err := db.PingContext(ctxReq)
if err != context.Canceled {
t.Fatalf("PingContext (Exhaust): %v", err)
}
}
close(donePing)
saturateDone.Wait()
// Now try to open a normal connection.
err := db.PingContext(ctx)
if err != nil {
t.Fatalf("PingContext (Normal): %v", err)
}
}
func TestRowsColumns(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
rows, err := db.Query("SELECT|people|age,name|")
if err != nil {
t.Fatalf("Query: %v", err)
}
cols, err := rows.Columns()
if err != nil {
t.Fatalf("Columns: %v", err)
}
want := []string{"age", "name"}
if !reflect.DeepEqual(cols, want) {
t.Errorf("got %#v; want %#v", cols, want)
}
if err := rows.Close(); err != nil {
t.Errorf("error closing rows: %s", err)
}
}
func TestRowsColumnTypes(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
rows, err := db.Query("SELECT|people|age,name|")
if err != nil {
t.Fatalf("Query: %v", err)
}
tt, err := rows.ColumnTypes()
if err != nil {
t.Fatalf("ColumnTypes: %v", err)
}
types := make([]reflect.Type, len(tt))
for i, tp := range tt {
st := tp.ScanType()
if st == nil {
t.Errorf("scantype is null for column %q", tp.Name())
continue
}
types[i] = st
}
values := make([]any, len(tt))
for i := range values {
values[i] = reflect.New(types[i]).Interface()
}
ct := 0
for rows.Next() {
err = rows.Scan(values...)
if err != nil {
t.Fatalf("failed to scan values in %v", err)
}
if ct == 1 {
if age := *values[0].(*int32); age != 2 {
t.Errorf("Expected 2, got %v", age)
}
if name := *values[1].(*string); name != "Bob" {
t.Errorf("Expected Bob, got %v", name)
}
}
ct++
}
if ct != 3 {
t.Errorf("expected 3 rows, got %d", ct)
}
if err := rows.Close(); err != nil {
t.Errorf("error closing rows: %s", err)
}
}
func TestQueryRow(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
var name string
var age int
var birthday time.Time
err := db.QueryRow("SELECT|people|age,name|age=?", 3).Scan(&age)
if err == nil || !strings.Contains(err.Error(), "expected 2 destination arguments") {
t.Errorf("expected error from wrong number of arguments; actually got: %v", err)
}
err = db.QueryRow("SELECT|people|bdate|age=?", 3).Scan(&birthday)
if err != nil || !birthday.Equal(chrisBirthday) {
t.Errorf("chris birthday = %v, err = %v; want %v", birthday, err, chrisBirthday)
}
err = db.QueryRow("SELECT|people|age,name|age=?", 2).Scan(&age, &name)
if err != nil {
t.Fatalf("age QueryRow+Scan: %v", err)
}
if name != "Bob" {
t.Errorf("expected name Bob, got %q", name)
}
if age != 2 {
t.Errorf("expected age 2, got %d", age)
}
err = db.QueryRow("SELECT|people|age,name|name=?", "Alice").Scan(&age, &name)
if err != nil {
t.Fatalf("name QueryRow+Scan: %v", err)
}
if name != "Alice" {
t.Errorf("expected name Alice, got %q", name)
}
if age != 1 {
t.Errorf("expected age 1, got %d", age)
}
var photo []byte
err = db.QueryRow("SELECT|people|photo|name=?", "Alice").Scan(&photo)
if err != nil {
t.Fatalf("photo QueryRow+Scan: %v", err)
}
want := []byte("APHOTO")
if !reflect.DeepEqual(photo, want) {
t.Errorf("photo = %q; want %q", photo, want)
}
}
func TestRowErr(t *testing.T) {
db := newTestDB(t, "people")
err := db.QueryRowContext(context.Background(), "SELECT|people|bdate|age=?", 3).Err()
if err != nil {
t.Errorf("Unexpected err = %v; want %v", err, nil)
}
ctx, cancel := context.WithCancel(context.Background())
cancel()
err = db.QueryRowContext(ctx, "SELECT|people|bdate|age=?", 3).Err()
exp := "context canceled"
if err == nil || !strings.Contains(err.Error(), exp) {
t.Errorf("Expected err = %v; got %v", exp, err)
}
}
func TestTxRollbackCommitErr(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
tx, err := db.Begin()
if err != nil {
t.Fatal(err)
}
err = tx.Rollback()
if err != nil {
t.Errorf("expected nil error from Rollback; got %v", err)
}
err = tx.Commit()
if err != ErrTxDone {
t.Errorf("expected %q from Commit; got %q", ErrTxDone, err)
}
tx, err = db.Begin()
if err != nil {
t.Fatal(err)
}
err = tx.Commit()
if err != nil {
t.Errorf("expected nil error from Commit; got %v", err)
}
err = tx.Rollback()
if err != ErrTxDone {
t.Errorf("expected %q from Rollback; got %q", ErrTxDone, err)
}
}
func TestStatementErrorAfterClose(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
stmt, err := db.Prepare("SELECT|people|age|name=?")
if err != nil {
t.Fatalf("Prepare: %v", err)
}
err = stmt.Close()
if err != nil {
t.Fatalf("Close: %v", err)
}
var name string
err = stmt.QueryRow("foo").Scan(&name)
if err == nil {
t.Errorf("expected error from QueryRow.Scan after Stmt.Close")
}
}
func TestStatementQueryRow(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
stmt, err := db.Prepare("SELECT|people|age|name=?")
if err != nil {
t.Fatalf("Prepare: %v", err)
}
defer stmt.Close()
var age int
for n, tt := range []struct {
name string
want int
}{
{"Alice", 1},
{"Bob", 2},
{"Chris", 3},
} {
if err := stmt.QueryRow(tt.name).Scan(&age); err != nil {
t.Errorf("%d: on %q, QueryRow/Scan: %v", n, tt.name, err)
} else if age != tt.want {
t.Errorf("%d: age=%d, want %d", n, age, tt.want)
}
}
}
type stubDriverStmt struct {
err error
}
func (s stubDriverStmt) Close() error {
return s.err
}
func (s stubDriverStmt) NumInput() int {
return -1
}
func (s stubDriverStmt) Exec(args []driver.Value) (driver.Result, error) {
return nil, nil
}
func (s stubDriverStmt) Query(args []driver.Value) (driver.Rows, error) {
return nil, nil
}
// golang.org/issue/12798
func TestStatementClose(t *testing.T) {
want := errors.New("STMT ERROR")
tests := []struct {
stmt *Stmt
msg string
}{
{&Stmt{stickyErr: want}, "stickyErr not propagated"},
{&Stmt{cg: &Tx{}, cgds: &driverStmt{Locker: &sync.Mutex{}, si: stubDriverStmt{want}}}, "driverStmt.Close() error not propagated"},
}
for _, test := range tests {
if err := test.stmt.Close(); err != want {
t.Errorf("%s. Got stmt.Close() = %v, want = %v", test.msg, err, want)
}
}
}
// golang.org/issue/3734
func TestStatementQueryRowConcurrent(t *testing.T) {
db := newTestDB(t, "people")
defer closeDB(t, db)
stmt, err := db.Prepare("SELECT|people|age|name=?")
if err != nil {
t.Fatalf("Prepare: %v", err)
}
defer stmt.Close()
const n = 10
ch := make(chan error, n)
for i := 0; i < n; i++ {
go func() {
var age int
err := stmt.QueryRow("Alice").Scan(&age)
if err == nil && age != 1 {
err = fmt.Errorf("unexpected age %d", age)
}
ch <- err
}()
}
for i := 0; i < n; i++ {
if err := <-ch; err != nil {
t.Error(err)