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rows_test.go
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rows_test.go
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package pgx_test
import (
"context"
"errors"
"fmt"
"os"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/jackc/pgx/v5"
"github.com/jackc/pgx/v5/pgconn"
"github.com/jackc/pgx/v5/pgxtest"
)
type testRowScanner struct {
name string
age int32
}
func (rs *testRowScanner) ScanRow(rows pgx.Rows) error {
return rows.Scan(&rs.name, &rs.age)
}
func TestRowScanner(t *testing.T) {
t.Parallel()
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
var s testRowScanner
err := conn.QueryRow(ctx, "select 'Adam' as name, 72 as height").Scan(&s)
require.NoError(t, err)
require.Equal(t, "Adam", s.name)
require.Equal(t, int32(72), s.age)
})
}
type testErrRowScanner string
func (ers *testErrRowScanner) ScanRow(rows pgx.Rows) error {
return errors.New(string(*ers))
}
// https://github.com/jackc/pgx/issues/1654
func TestRowScannerErrorIsFatalToRows(t *testing.T) {
t.Parallel()
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
s := testErrRowScanner("foo")
err := conn.QueryRow(ctx, "select 'Adam' as name, 72 as height").Scan(&s)
require.EqualError(t, err, "foo")
})
}
func TestForEachRow(t *testing.T) {
t.Parallel()
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
defer cancel()
pgxtest.RunWithQueryExecModes(ctx, t, defaultConnTestRunner, nil, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
var actualResults []any
rows, _ := conn.Query(
context.Background(),
"select n, n * 2 from generate_series(1, $1) n",
3,
)
var a, b int
ct, err := pgx.ForEachRow(rows, []any{&a, &b}, func() error {
actualResults = append(actualResults, []any{a, b})
return nil
})
require.NoError(t, err)
expectedResults := []any{
[]any{1, 2},
[]any{2, 4},
[]any{3, 6},
}
require.Equal(t, expectedResults, actualResults)
require.EqualValues(t, 3, ct.RowsAffected())
})
}
func TestForEachRowScanError(t *testing.T) {
t.Parallel()
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
defer cancel()
pgxtest.RunWithQueryExecModes(ctx, t, defaultConnTestRunner, nil, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
var actualResults []any
rows, _ := conn.Query(
context.Background(),
"select 'foo', 'bar' from generate_series(1, $1) n",
3,
)
var a, b int
ct, err := pgx.ForEachRow(rows, []any{&a, &b}, func() error {
actualResults = append(actualResults, []any{a, b})
return nil
})
require.EqualError(t, err, "can't scan into dest[0]: cannot scan text (OID 25) in text format into *int")
require.Equal(t, pgconn.CommandTag{}, ct)
})
}
func TestForEachRowAbort(t *testing.T) {
t.Parallel()
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
defer cancel()
pgxtest.RunWithQueryExecModes(ctx, t, defaultConnTestRunner, nil, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(
context.Background(),
"select n, n * 2 from generate_series(1, $1) n",
3,
)
var a, b int
ct, err := pgx.ForEachRow(rows, []any{&a, &b}, func() error {
return errors.New("abort")
})
require.EqualError(t, err, "abort")
require.Equal(t, pgconn.CommandTag{}, ct)
})
}
func ExampleForEachRow() {
conn, err := pgx.Connect(context.Background(), os.Getenv("PGX_TEST_DATABASE"))
if err != nil {
fmt.Printf("Unable to establish connection: %v", err)
return
}
rows, _ := conn.Query(
context.Background(),
"select n, n * 2 from generate_series(1, $1) n",
3,
)
var a, b int
_, err = pgx.ForEachRow(rows, []any{&a, &b}, func() error {
fmt.Printf("%v, %v\n", a, b)
return nil
})
if err != nil {
fmt.Printf("ForEachRow error: %v", err)
return
}
// Output:
// 1, 2
// 2, 4
// 3, 6
}
func TestCollectRows(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select n from generate_series(0, 99) n`)
numbers, err := pgx.CollectRows(rows, func(row pgx.CollectableRow) (int32, error) {
var n int32
err := row.Scan(&n)
return n, err
})
require.NoError(t, err)
assert.Len(t, numbers, 100)
for i := range numbers {
assert.Equal(t, int32(i), numbers[i])
}
})
}
func TestCollectRowsEmpty(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select n from generate_series(1, 0) n`)
numbers, err := pgx.CollectRows(rows, func(row pgx.CollectableRow) (int32, error) {
var n int32
err := row.Scan(&n)
return n, err
})
require.NoError(t, err)
require.NotNil(t, numbers)
assert.Empty(t, numbers)
})
}
// This example uses CollectRows with a manually written collector function. In most cases RowTo, RowToAddrOf,
// RowToStructByPos, RowToAddrOfStructByPos, or another generic function would be used.
func ExampleCollectRows() {
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
defer cancel()
conn, err := pgx.Connect(ctx, os.Getenv("PGX_TEST_DATABASE"))
if err != nil {
fmt.Printf("Unable to establish connection: %v", err)
return
}
rows, _ := conn.Query(ctx, `select n from generate_series(1, 5) n`)
numbers, err := pgx.CollectRows(rows, func(row pgx.CollectableRow) (int32, error) {
var n int32
err := row.Scan(&n)
return n, err
})
if err != nil {
fmt.Printf("CollectRows error: %v", err)
return
}
fmt.Println(numbers)
// Output:
// [1 2 3 4 5]
}
func TestCollectOneRow(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 42`)
n, err := pgx.CollectOneRow(rows, func(row pgx.CollectableRow) (int32, error) {
var n int32
err := row.Scan(&n)
return n, err
})
assert.NoError(t, err)
assert.Equal(t, int32(42), n)
})
}
func TestCollectOneRowNotFound(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 42 where false`)
n, err := pgx.CollectOneRow(rows, func(row pgx.CollectableRow) (int32, error) {
var n int32
err := row.Scan(&n)
return n, err
})
assert.ErrorIs(t, err, pgx.ErrNoRows)
assert.Equal(t, int32(0), n)
})
}
func TestCollectOneRowIgnoresExtraRows(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select n from generate_series(42, 99) n`)
n, err := pgx.CollectOneRow(rows, func(row pgx.CollectableRow) (int32, error) {
var n int32
err := row.Scan(&n)
return n, err
})
require.NoError(t, err)
assert.NoError(t, err)
assert.Equal(t, int32(42), n)
})
}
// https://github.com/jackc/pgx/issues/1334
func TestCollectOneRowPrefersPostgreSQLErrorOverErrNoRows(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
_, err := conn.Exec(ctx, `create temporary table t (name text not null unique)`)
require.NoError(t, err)
var name string
rows, _ := conn.Query(ctx, `insert into t (name) values ('foo') returning name`)
name, err = pgx.CollectOneRow(rows, func(row pgx.CollectableRow) (string, error) {
var n string
err := row.Scan(&n)
return n, err
})
require.NoError(t, err)
require.Equal(t, "foo", name)
rows, _ = conn.Query(ctx, `insert into t (name) values ('foo') returning name`)
name, err = pgx.CollectOneRow(rows, func(row pgx.CollectableRow) (string, error) {
var n string
err := row.Scan(&n)
return n, err
})
require.Error(t, err)
var pgErr *pgconn.PgError
require.ErrorAs(t, err, &pgErr)
require.Equal(t, "23505", pgErr.Code)
require.Equal(t, "", name)
})
}
func TestCollectExactlyOneRow(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 42`)
n, err := pgx.CollectExactlyOneRow(rows, func(row pgx.CollectableRow) (int32, error) {
var n int32
err := row.Scan(&n)
return n, err
})
assert.NoError(t, err)
assert.Equal(t, int32(42), n)
})
}
func TestCollectExactlyOneRowNotFound(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 42 where false`)
n, err := pgx.CollectExactlyOneRow(rows, func(row pgx.CollectableRow) (int32, error) {
var n int32
err := row.Scan(&n)
return n, err
})
assert.ErrorIs(t, err, pgx.ErrNoRows)
assert.Equal(t, int32(0), n)
})
}
func TestCollectExactlyOneRowExtraRows(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select n from generate_series(42, 99) n`)
n, err := pgx.CollectExactlyOneRow(rows, func(row pgx.CollectableRow) (int32, error) {
var n int32
err := row.Scan(&n)
return n, err
})
assert.ErrorIs(t, err, pgx.ErrTooManyRows)
assert.Equal(t, int32(0), n)
})
}
func TestRowTo(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select n from generate_series(0, 99) n`)
numbers, err := pgx.CollectRows(rows, pgx.RowTo[int32])
require.NoError(t, err)
assert.Len(t, numbers, 100)
for i := range numbers {
assert.Equal(t, int32(i), numbers[i])
}
})
}
func ExampleRowTo() {
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
defer cancel()
conn, err := pgx.Connect(ctx, os.Getenv("PGX_TEST_DATABASE"))
if err != nil {
fmt.Printf("Unable to establish connection: %v", err)
return
}
rows, _ := conn.Query(ctx, `select n from generate_series(1, 5) n`)
numbers, err := pgx.CollectRows(rows, pgx.RowTo[int32])
if err != nil {
fmt.Printf("CollectRows error: %v", err)
return
}
fmt.Println(numbers)
// Output:
// [1 2 3 4 5]
}
func TestRowToAddrOf(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select n from generate_series(0, 99) n`)
numbers, err := pgx.CollectRows(rows, pgx.RowToAddrOf[int32])
require.NoError(t, err)
assert.Len(t, numbers, 100)
for i := range numbers {
assert.Equal(t, int32(i), *numbers[i])
}
})
}
func ExampleRowToAddrOf() {
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
defer cancel()
conn, err := pgx.Connect(ctx, os.Getenv("PGX_TEST_DATABASE"))
if err != nil {
fmt.Printf("Unable to establish connection: %v", err)
return
}
rows, _ := conn.Query(ctx, `select n from generate_series(1, 5) n`)
pNumbers, err := pgx.CollectRows(rows, pgx.RowToAddrOf[int32])
if err != nil {
fmt.Printf("CollectRows error: %v", err)
return
}
for _, p := range pNumbers {
fmt.Println(*p)
}
// Output:
// 1
// 2
// 3
// 4
// 5
}
func TestRowToMap(t *testing.T) {
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'Joe' as name, n as age from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToMap)
require.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Joe", slice[i]["name"])
assert.EqualValues(t, i, slice[i]["age"])
}
})
}
func TestRowToStructByPos(t *testing.T) {
type person struct {
Name string
Age int32
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'Joe' as name, n as age from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByPos[person])
require.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Joe", slice[i].Name)
assert.EqualValues(t, i, slice[i].Age)
}
})
}
func TestRowToStructByPosIgnoredField(t *testing.T) {
type person struct {
Name string
Age int32 `db:"-"`
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'Joe' as name from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByPos[person])
require.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Joe", slice[i].Name)
}
})
}
func TestRowToStructByPosEmbeddedStruct(t *testing.T) {
type Name struct {
First string
Last string
}
type person struct {
Name
Age int32
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'John' as first_name, 'Smith' as last_name, n as age from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByPos[person])
require.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "John", slice[i].Name.First)
assert.Equal(t, "Smith", slice[i].Name.Last)
assert.EqualValues(t, i, slice[i].Age)
}
})
}
func TestRowToStructByPosMultipleEmbeddedStruct(t *testing.T) {
type Sandwich struct {
Bread string
Salad string
}
type Drink struct {
Ml int
}
type meal struct {
Sandwich
Drink
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'Baguette' as bread, 'Lettuce' as salad, drink_ml from generate_series(0, 9) drink_ml`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByPos[meal])
require.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Baguette", slice[i].Sandwich.Bread)
assert.Equal(t, "Lettuce", slice[i].Sandwich.Salad)
assert.EqualValues(t, i, slice[i].Drink.Ml)
}
})
}
func TestRowToStructByPosEmbeddedUnexportedStruct(t *testing.T) {
type name struct {
First string
Last string
}
type person struct {
name
Age int32
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'John' as first_name, 'Smith' as last_name, n as age from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByPos[person])
require.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "John", slice[i].name.First)
assert.Equal(t, "Smith", slice[i].name.Last)
assert.EqualValues(t, i, slice[i].Age)
}
})
}
// Pointer to struct is not supported. But check that we don't panic.
func TestRowToStructByPosEmbeddedPointerToStruct(t *testing.T) {
type Name struct {
First string
Last string
}
type person struct {
*Name
Age int32
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'John' as first_name, 'Smith' as last_name, n as age from generate_series(0, 9) n`)
_, err := pgx.CollectRows(rows, pgx.RowToStructByPos[person])
require.EqualError(t, err, "got 3 values, but dst struct has only 2 fields")
})
}
func ExampleRowToStructByPos() {
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
defer cancel()
conn, err := pgx.Connect(ctx, os.Getenv("PGX_TEST_DATABASE"))
if err != nil {
fmt.Printf("Unable to establish connection: %v", err)
return
}
if conn.PgConn().ParameterStatus("crdb_version") != "" {
// Skip test / example when running on CockroachDB. Since an example can't be skipped fake success instead.
fmt.Println(`Cheeseburger: $10
Fries: $5
Soft Drink: $3`)
return
}
// Setup example schema and data.
_, err = conn.Exec(ctx, `
create temporary table products (
id int primary key generated by default as identity,
name varchar(100) not null,
price int not null
);
insert into products (name, price) values
('Cheeseburger', 10),
('Double Cheeseburger', 14),
('Fries', 5),
('Soft Drink', 3);
`)
if err != nil {
fmt.Printf("Unable to setup example schema and data: %v", err)
return
}
type product struct {
ID int32
Name string
Price int32
}
rows, _ := conn.Query(ctx, "select * from products where price < $1 order by price desc", 12)
products, err := pgx.CollectRows(rows, pgx.RowToStructByPos[product])
if err != nil {
fmt.Printf("CollectRows error: %v", err)
return
}
for _, p := range products {
fmt.Printf("%s: $%d\n", p.Name, p.Price)
}
// Output:
// Cheeseburger: $10
// Fries: $5
// Soft Drink: $3
}
func TestRowToAddrOfStructPos(t *testing.T) {
type person struct {
Name string
Age int32
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'Joe' as name, n as age from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToAddrOfStructByPos[person])
require.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Joe", slice[i].Name)
assert.EqualValues(t, i, slice[i].Age)
}
})
}
func TestRowToStructByName(t *testing.T) {
type person struct {
Last string
First string
Age int32
AccountID string
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'John' as first, 'Smith' as last, n as age, 'd5e49d3f' as account_id from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByName[person])
assert.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Smith", slice[i].Last)
assert.Equal(t, "John", slice[i].First)
assert.EqualValues(t, i, slice[i].Age)
assert.Equal(t, "d5e49d3f", slice[i].AccountID)
}
// check missing fields in a returned row
rows, _ = conn.Query(ctx, `select 'Smith' as last, n as age from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToStructByName[person])
assert.ErrorContains(t, err, "cannot find field First in returned row")
// check missing field in a destination struct
rows, _ = conn.Query(ctx, `select 'John' as first, 'Smith' as last, n as age, 'd5e49d3f' as account_id, null as ignore from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToAddrOfStructByName[person])
assert.ErrorContains(t, err, "struct doesn't have corresponding row field ignore")
})
}
func TestRowToStructByNameDbTags(t *testing.T) {
type person struct {
Last string `db:"last_name"`
First string `db:"first_name"`
Age int32 `db:"age"`
AccountID string `db:"account_id"`
AnotherAccountID string `db:"account__id"`
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'John' as first_name, 'Smith' as last_name, n as age, 'd5e49d3f' as account_id, '5e49d321' as account__id from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByName[person])
assert.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Smith", slice[i].Last)
assert.Equal(t, "John", slice[i].First)
assert.EqualValues(t, i, slice[i].Age)
assert.Equal(t, "d5e49d3f", slice[i].AccountID)
assert.Equal(t, "5e49d321", slice[i].AnotherAccountID)
}
// check missing fields in a returned row
rows, _ = conn.Query(ctx, `select 'Smith' as last_name, n as age from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToStructByName[person])
assert.ErrorContains(t, err, "cannot find field first_name in returned row")
// check missing field in a destination struct
rows, _ = conn.Query(ctx, `select 'John' as first_name, 'Smith' as last_name, n as age, 'd5e49d3f' as account_id, '5e49d321' as account__id, null as ignore from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToAddrOfStructByName[person])
assert.ErrorContains(t, err, "struct doesn't have corresponding row field ignore")
})
}
func TestRowToStructByNameEmbeddedStruct(t *testing.T) {
type Name struct {
Last string `db:"last_name"`
First string `db:"first_name"`
}
type person struct {
Ignore bool `db:"-"`
Name
Age int32
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'John' as first_name, 'Smith' as last_name, n as age from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByName[person])
assert.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Smith", slice[i].Name.Last)
assert.Equal(t, "John", slice[i].Name.First)
assert.EqualValues(t, i, slice[i].Age)
}
// check missing fields in a returned row
rows, _ = conn.Query(ctx, `select 'Smith' as last_name, n as age from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToStructByName[person])
assert.ErrorContains(t, err, "cannot find field first_name in returned row")
// check missing field in a destination struct
rows, _ = conn.Query(ctx, `select 'John' as first_name, 'Smith' as last_name, n as age, null as ignore from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToAddrOfStructByName[person])
assert.ErrorContains(t, err, "struct doesn't have corresponding row field ignore")
})
}
func ExampleRowToStructByName() {
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
defer cancel()
conn, err := pgx.Connect(ctx, os.Getenv("PGX_TEST_DATABASE"))
if err != nil {
fmt.Printf("Unable to establish connection: %v", err)
return
}
if conn.PgConn().ParameterStatus("crdb_version") != "" {
// Skip test / example when running on CockroachDB. Since an example can't be skipped fake success instead.
fmt.Println(`Cheeseburger: $10
Fries: $5
Soft Drink: $3`)
return
}
// Setup example schema and data.
_, err = conn.Exec(ctx, `
create temporary table products (
id int primary key generated by default as identity,
name varchar(100) not null,
price int not null
);
insert into products (name, price) values
('Cheeseburger', 10),
('Double Cheeseburger', 14),
('Fries', 5),
('Soft Drink', 3);
`)
if err != nil {
fmt.Printf("Unable to setup example schema and data: %v", err)
return
}
type product struct {
ID int32
Name string
Price int32
}
rows, _ := conn.Query(ctx, "select * from products where price < $1 order by price desc", 12)
products, err := pgx.CollectRows(rows, pgx.RowToStructByName[product])
if err != nil {
fmt.Printf("CollectRows error: %v", err)
return
}
for _, p := range products {
fmt.Printf("%s: $%d\n", p.Name, p.Price)
}
// Output:
// Cheeseburger: $10
// Fries: $5
// Soft Drink: $3
}
func TestRowToStructByNameLax(t *testing.T) {
type person struct {
Last string
First string
Age int32
Ignore bool `db:"-"`
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'John' as first, 'Smith' as last, n as age from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByNameLax[person])
assert.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Smith", slice[i].Last)
assert.Equal(t, "John", slice[i].First)
assert.EqualValues(t, i, slice[i].Age)
}
// check missing fields in a returned row
rows, _ = conn.Query(ctx, `select 'John' as first, n as age from generate_series(0, 9) n`)
slice, err = pgx.CollectRows(rows, pgx.RowToStructByNameLax[person])
assert.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "John", slice[i].First)
assert.EqualValues(t, i, slice[i].Age)
}
// check extra fields in a returned row
rows, _ = conn.Query(ctx, `select 'John' as first, 'Smith' as last, n as age, null as ignore from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToAddrOfStructByNameLax[person])
assert.ErrorContains(t, err, "struct doesn't have corresponding row field ignore")
// check missing fields in a destination struct
rows, _ = conn.Query(ctx, `select 'Smith' as last, 'D.' as middle, n as age from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToAddrOfStructByNameLax[person])
assert.ErrorContains(t, err, "struct doesn't have corresponding row field middle")
// check ignored fields in a destination struct
rows, _ = conn.Query(ctx, `select 'Smith' as last, n as age, null as ignore from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToAddrOfStructByNameLax[person])
assert.ErrorContains(t, err, "struct doesn't have corresponding row field ignore")
})
}
func TestRowToStructByNameLaxEmbeddedStruct(t *testing.T) {
type Name struct {
Last string `db:"last_name"`
First string `db:"first_name"`
}
type person struct {
Ignore bool `db:"-"`
Name
Age int32
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
rows, _ := conn.Query(ctx, `select 'John' as first_name, 'Smith' as last_name, n as age from generate_series(0, 9) n`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByNameLax[person])
assert.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "Smith", slice[i].Name.Last)
assert.Equal(t, "John", slice[i].Name.First)
assert.EqualValues(t, i, slice[i].Age)
}
// check missing fields in a returned row
rows, _ = conn.Query(ctx, `select 'John' as first_name, n as age from generate_series(0, 9) n`)
slice, err = pgx.CollectRows(rows, pgx.RowToStructByNameLax[person])
assert.NoError(t, err)
assert.Len(t, slice, 10)
for i := range slice {
assert.Equal(t, "John", slice[i].Name.First)
assert.EqualValues(t, i, slice[i].Age)
}
// check extra fields in a returned row
rows, _ = conn.Query(ctx, `select 'John' as first_name, 'Smith' as last_name, n as age, null as ignore from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToAddrOfStructByNameLax[person])
assert.ErrorContains(t, err, "struct doesn't have corresponding row field ignore")
// check missing fields in a destination struct
rows, _ = conn.Query(ctx, `select 'Smith' as last_name, 'D.' as middle_name, n as age from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToAddrOfStructByNameLax[person])
assert.ErrorContains(t, err, "struct doesn't have corresponding row field middle_name")
// check ignored fields in a destination struct
rows, _ = conn.Query(ctx, `select 'Smith' as last_name, n as age, null as ignore from generate_series(0, 9) n`)
_, err = pgx.CollectRows(rows, pgx.RowToAddrOfStructByNameLax[person])
assert.ErrorContains(t, err, "struct doesn't have corresponding row field ignore")
})
}
func TestRowToStructByNameLaxRowValue(t *testing.T) {
type AnotherTable struct{}
type User struct {
UserID int `json:"userId" db:"user_id"`
Name string `json:"name" db:"name"`
}
type UserAPIKey struct {
UserAPIKeyID int `json:"userApiKeyId" db:"user_api_key_id"`
UserID int `json:"userId" db:"user_id"`
User *User `json:"user" db:"user"`
AnotherTable *AnotherTable `json:"anotherTable" db:"another_table"`
}
defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
pgxtest.SkipCockroachDB(t, conn, "")
rows, _ := conn.Query(ctx, `
WITH user_api_keys AS (
SELECT 1 AS user_id, 101 AS user_api_key_id, 'abc123' AS api_key
), users AS (
SELECT 1 AS user_id, 'John Doe' AS name
)
SELECT user_api_keys.user_api_key_id, user_api_keys.user_id, row(users.*) AS user
FROM user_api_keys
LEFT JOIN users ON users.user_id = user_api_keys.user_id
WHERE user_api_keys.api_key = 'abc123';
`)
slice, err := pgx.CollectRows(rows, pgx.RowToStructByNameLax[UserAPIKey])
assert.NoError(t, err)
assert.ElementsMatch(t, slice, []UserAPIKey{{UserAPIKeyID: 101, UserID: 1, User: &User{UserID: 1, Name: "John Doe"}, AnotherTable: nil}})
})
}
func ExampleRowToStructByNameLax() {
ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
defer cancel()
conn, err := pgx.Connect(ctx, os.Getenv("PGX_TEST_DATABASE"))
if err != nil {
fmt.Printf("Unable to establish connection: %v", err)
return
}
if conn.PgConn().ParameterStatus("crdb_version") != "" {
// Skip test / example when running on CockroachDB. Since an example can't be skipped fake success instead.
fmt.Println(`Cheeseburger: $10
Fries: $5
Soft Drink: $3`)
return
}
// Setup example schema and data.
_, err = conn.Exec(ctx, `
create temporary table products (
id int primary key generated by default as identity,
name varchar(100) not null,
price int not null
);
insert into products (name, price) values
('Cheeseburger', 10),
('Double Cheeseburger', 14),
('Fries', 5),
('Soft Drink', 3);
`)
if err != nil {
fmt.Printf("Unable to setup example schema and data: %v", err)
return
}
type product struct {
ID int32
Name string
Type string
Price int32
}
rows, _ := conn.Query(ctx, "select * from products where price < $1 order by price desc", 12)
products, err := pgx.CollectRows(rows, pgx.RowToStructByNameLax[product])
if err != nil {
fmt.Printf("CollectRows error: %v", err)
return
}
for _, p := range products {
fmt.Printf("%s: $%d\n", p.Name, p.Price)
}
// Output:
// Cheeseburger: $10
// Fries: $5
// Soft Drink: $3
}