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Copy pathrows_slice_scanner_test.go
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rows_slice_scanner_test.go
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package pgutil
import (
"context"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestSliceScanner(t *testing.T) {
t.Run("scalar values", func(t *testing.T) {
values, err := ScanInts(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (1), (2), (3)) AS t(number)`),
))
require.NoError(t, err)
assert.Equal(t, []int{1, 2, 3}, values)
})
t.Run("custom struct values", func(t *testing.T) {
values, err := scanTestPairs(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (1,2), (2,3), (3,4)) AS t(x,y)`),
))
require.NoError(t, err)
assert.Equal(t, []testPair{{1, 2}, {2, 3}, {3, 4}}, values)
})
t.Run("no values", func(t *testing.T) {
values, err := ScanInts(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (1), (2), (3)) AS t(number) LIMIT 0`),
))
require.NoError(t, err)
assert.Empty(t, values)
})
}
func TestMaybeSliceScanner(t *testing.T) {
values, err := scanMaybeTestPairs(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (1,2), (2,3), (0,0), (3,4)) AS t(x,y)`),
))
require.NoError(t, err)
assert.Equal(t, []testPair{{1, 2}, {2, 3}}, values)
}
func TestFirstScanner(t *testing.T) {
t.Run("scalar value", func(t *testing.T) {
value, ok, err := ScanInt(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (1)) AS t(number)`),
))
require.NoError(t, err)
assert.True(t, ok)
assert.Equal(t, 1, value)
})
t.Run("scalar value (ignores non-first values)", func(t *testing.T) {
value, ok, err := ScanInt(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (1), (2), (3)) AS t(number)`),
))
require.NoError(t, err)
assert.True(t, ok)
assert.Equal(t, 1, value)
})
t.Run("custom struct value", func(t *testing.T) {
value, ok, err := scanFirstTestPair(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (1,2)) AS t(x,y)`),
))
require.NoError(t, err)
assert.True(t, ok)
assert.Equal(t, testPair{1, 2}, value)
})
t.Run("no value", func(t *testing.T) {
_, ok, err := ScanInt(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (1), (2), (3)) AS t(number) LIMIT 0`),
))
require.NoError(t, err)
assert.False(t, ok)
})
}
func TestMaybeFirstScanner(t *testing.T) {
t.Run("custom struct value", func(t *testing.T) {
value, ok, err := scanMaybeFirstTestPair(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (1,2)) AS t(x,y)`),
))
require.NoError(t, err)
assert.True(t, ok)
assert.Equal(t, testPair{1, 2}, value)
})
t.Run("rejected value", func(t *testing.T) {
type testPair struct {
x int
y int
}
scanner := NewMaybeFirstScanner(func(s Scanner) (p testPair, _ bool, _ error) {
err := s.Scan(&p.x, &p.y)
return p, p.x != 0 && p.y != 0, err
})
_, ok, err := scanner(NewTestDB(t).Query(context.Background(),
RawQuery(`SELECT * FROM (VALUES (0,0), (1,2)) AS t(x,y)`),
))
require.NoError(t, err)
assert.False(t, ok)
})
}
//
//
//
type testPair struct {
x int
y int
}
var scanTestPairs = NewSliceScanner(func(s Scanner) (p testPair, _ error) {
err := s.Scan(&p.x, &p.y)
return p, err
})
var scanMaybeTestPairs = NewMaybeSliceScanner(func(s Scanner) (p testPair, _ bool, _ error) {
err := s.Scan(&p.x, &p.y)
return p, p.x != 0 && p.y != 0, err
})
var scanFirstTestPair = NewFirstScanner(func(s Scanner) (p testPair, _ error) {
err := s.Scan(&p.x, &p.y)
return p, err
})
var scanMaybeFirstTestPair = NewMaybeFirstScanner(func(s Scanner) (p testPair, _ bool, _ error) {
err := s.Scan(&p.x, &p.y)
return p, p.x != 0 && p.y != 0, err
})