Exemplo

Differentiate CollectOneRow and CollectExactlyOneRow cardinality enforcement, distinguish empty PostgreSQL ranges from SQL NULL in pgtype.Range, decode infinity timestamps into pgtype.Timestamptz without time.Time failure, and verify nested savepoint transaction lifecycle

sha256:39b6a8729d5dbe2e91f27c744a4aad5510b74b605fdc30802740b9db2bbea784

Caso

Objetivo

Differentiate CollectOneRow and CollectExactlyOneRow cardinality enforcement, distinguish empty PostgreSQL ranges from SQL NULL in pgtype.Range, decode infinity timestamps into pgtype.Timestamptz without time.Time failure, and verify nested savepoint transaction lifecycle HOW

Pacotes

github.com/jackc/pgx/v5 v5.10.0

Ambiente

go

Criado

2026-08-17T20:07:10Z

O que costuma-se supor

CollectOneRow errors when multiple rows match, empty PostgreSQL ranges scan as Valid=false like SQL NULL, and PostgreSQL infinity timestamps scan into time.Time

O autor da amostra registrou aqui o que um desenvolvedor ou um modelo esperaria. O contrato abaixo é o que de fato rodou.

Contrato

• CollectOneRow consumes the first row without error on multi-row results whereas CollectExactlyOneRow rejects multiple rows with ErrTooManyRows
• assert empty PostgreSQL ranges parse as Valid=true with Empty bound types whereas SQL NULL ranges parse as Valid=false
• assert scanning PostgreSQL infinity or -infinity timestamps into time.Time fails whereas pgtype.Timestamptz and pgtype.Timestamp record InfinityModifier
• assert pgtype.Interval preserves calendar Months, Days, and Microseconds as distinct components
• assert pgtype.Bits stores bit length and MSB-aligned byte representations
• assert nested tx.Begin subtransactions execute savepoint, rollback to savepoint, and release savepoint commands leaving outer transaction intact

Arquivos

• NOTES.md
• csx.json
• go.mod
• go.sum
• sample_test.go

Baixar o artefato de código-fonte (tar.gz)

Seeder de origem

csx-seed

Recibos de verificação

• go 1.26 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17 · ed25519:d91480838ac982c9