postgres

package

v0.12.0 Latest Latest Go to latest Published: Jun 11, 2026 License: MIT Imports: 7 Imported by: 0

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Repository

github.com/electwix/db-catalyst

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Documentation ¶

Overview ¶

Package postgres implements a verify.Verifier for PostgreSQL using the pgx native driver (github.com/jackc/pgx/v5). It provides full origin-trace and type refinement per RFC 0004:

Each query is prepared via pgx.Conn.Prepare, which returns pgconn.StatementDescription with typed FieldDescriptions.
DataTypeOID is resolved to a pg type name via a pg_type cache built once per connection.
When TableOID != 0, (TableOID, TableAttributeNumber) is resolved to (table, column) via pg_class/pg_attribute (lazily cached).
The resulting verify.Column carries DeclType (the pg type name), TableName, and OriginName when available, so the overlay can apply the UseDeclType path for expression/aggregate columns.

MySQL origin ¶

MySQL does not surface reliable origin information via the standard database/sql ColumnType; see internal/verify/mysql for the type-only refinement path.

Integration tests ¶

The live connect/prepare path is integration-only and is skipped when DB_CATALYST_VERIFY_DSN is unset. The core mapping logic (fieldsToColumns) is fully unit-tested with constructed fakes.

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func New ¶

func New(dsn string) verify.Verifier

New returns a PostgreSQL verify.Verifier that connects via pgx. dsn should be a postgres:// URL or libpq-style connection string accepted by pgx (e.g. "postgres://user:pass@host/dbname").

Types ¶

type FieldLike ¶

type FieldLike interface {
	ColName() string  // result column name
	TblOID() uint32   // origin table OID; 0 for expressions
	AttNum() uint16   // attribute number within the table; 0 for expressions
	DTypeOID() uint32 // data type OID
}

FieldLike abstracts one result-column description so that fieldsToColumns can be unit-tested with constructed fakes without a live pgx connection.

Source Files ¶

View all Source files

postgres.go

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