mirror of https://github.com/jackc/pgx.git
131 lines
4.1 KiB
Go
131 lines
4.1 KiB
Go
package pgtype_test
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import (
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"context"
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"database/sql"
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"testing"
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pgx "github.com/jackc/pgx/v5"
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"github.com/jackc/pgx/v5/pgxtest"
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"github.com/stretchr/testify/require"
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)
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func isExpectedEqMap(a any) func(any) bool {
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return func(v any) bool {
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aa := a.(map[string]any)
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bb := v.(map[string]any)
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if (aa == nil) != (bb == nil) {
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return false
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}
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if aa == nil {
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return true
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}
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if len(aa) != len(bb) {
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return false
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}
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for k := range aa {
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if aa[k] != bb[k] {
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return false
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}
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}
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return true
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}
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}
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func TestJSONCodec(t *testing.T) {
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type jsonStruct struct {
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Name string `json:"name"`
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Age int `json:"age"`
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}
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pgxtest.RunValueRoundTripTests(context.Background(), t, defaultConnTestRunner, nil, "json", []pgxtest.ValueRoundTripTest{
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{nil, new(*jsonStruct), isExpectedEq((*jsonStruct)(nil))},
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{map[string]any(nil), new(*string), isExpectedEq((*string)(nil))},
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{map[string]any(nil), new([]byte), isExpectedEqBytes([]byte(nil))},
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{[]byte(nil), new([]byte), isExpectedEqBytes([]byte(nil))},
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{nil, new([]byte), isExpectedEqBytes([]byte(nil))},
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// Test sql.Scanner. (https://github.com/jackc/pgx/issues/1418)
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{"42", new(sql.NullInt64), isExpectedEq(sql.NullInt64{Int64: 42, Valid: true})},
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// Test driver.Valuer. (https://github.com/jackc/pgx/issues/1430)
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{sql.NullInt64{Int64: 42, Valid: true}, new(sql.NullInt64), isExpectedEq(sql.NullInt64{Int64: 42, Valid: true})},
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})
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pgxtest.RunValueRoundTripTests(context.Background(), t, defaultConnTestRunner, pgxtest.KnownOIDQueryExecModes, "json", []pgxtest.ValueRoundTripTest{
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{[]byte("{}"), new([]byte), isExpectedEqBytes([]byte("{}"))},
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{[]byte("null"), new([]byte), isExpectedEqBytes([]byte("null"))},
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{[]byte("42"), new([]byte), isExpectedEqBytes([]byte("42"))},
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{[]byte(`"hello"`), new([]byte), isExpectedEqBytes([]byte(`"hello"`))},
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{[]byte(`"hello"`), new(string), isExpectedEq(`"hello"`)},
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{map[string]any{"foo": "bar"}, new(map[string]any), isExpectedEqMap(map[string]any{"foo": "bar"})},
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{jsonStruct{Name: "Adam", Age: 10}, new(jsonStruct), isExpectedEq(jsonStruct{Name: "Adam", Age: 10})},
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})
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}
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// https://github.com/jackc/pgx/issues/1273#issuecomment-1221414648
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func TestJSONCodecUnmarshalSQLNull(t *testing.T) {
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defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
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// Slices are nilified
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slice := []string{"foo", "bar", "baz"}
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err := conn.QueryRow(ctx, "select null::json").Scan(&slice)
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require.NoError(t, err)
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require.Nil(t, slice)
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// Maps are nilified
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m := map[string]any{"foo": "bar"}
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err = conn.QueryRow(ctx, "select null::json").Scan(&m)
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require.NoError(t, err)
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require.Nil(t, m)
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// Pointer to pointer are nilified
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n := 42
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p := &n
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err = conn.QueryRow(ctx, "select null::json").Scan(&p)
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require.NoError(t, err)
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require.Nil(t, p)
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// A string cannot scan a NULL.
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str := "foobar"
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err = conn.QueryRow(ctx, "select null::json").Scan(&str)
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require.EqualError(t, err, "can't scan into dest[0]: cannot scan NULL into *string")
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// A non-string cannot scan a NULL.
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err = conn.QueryRow(ctx, "select null::json").Scan(&n)
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require.EqualError(t, err, "can't scan into dest[0]: cannot scan NULL into *int")
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})
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}
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// https://github.com/jackc/pgx/issues/1470
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func TestJSONCodecPointerToPointerToString(t *testing.T) {
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defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
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var s *string
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err := conn.QueryRow(ctx, "select '{}'::json").Scan(&s)
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require.NoError(t, err)
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require.NotNil(t, s)
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require.Equal(t, "{}", *s)
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err = conn.QueryRow(ctx, "select null::json").Scan(&s)
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require.NoError(t, err)
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require.Nil(t, s)
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})
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}
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func TestJSONCodecClearExistingValueBeforeUnmarshal(t *testing.T) {
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defaultConnTestRunner.RunTest(context.Background(), t, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {
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m := map[string]any{}
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err := conn.QueryRow(ctx, `select '{"foo": "bar"}'::json`).Scan(&m)
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require.NoError(t, err)
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require.Equal(t, map[string]any{"foo": "bar"}, m)
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err = conn.QueryRow(ctx, `select '{"baz": "quz"}'::json`).Scan(&m)
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require.NoError(t, err)
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require.Equal(t, map[string]any{"baz": "quz"}, m)
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})
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}
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