README
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dapgx
dapgx provides PostgreSQL backends for the daql project.
This project implements a custom set of decoder and encoders for xelf literals.
License
Copyright (c) Martin Schnabel. All rights reserved. Use of the source code is governed by a BSD-style license that can found in the LICENSE file.
Credit
The encoder, decoder and text array details were strictly rewritten based on pgtype. The original pgtype code uses the MIT LICENSE and the Copyright (c) 2013-2021 Jack Christensen
Documentation
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Overview ¶
The text array details were mostly rewritten based on pgtype. pgtype uses the MIT LICENSE and the Copyright (c) 2013-2021 Jack Christensen
Index ¶
- Constants
- Variables
- func ColKey(key string, t typ.Type) (string, error)
- func Exec(ctx context.Context, pc PC, sql string, args []lit.Val) error
- func FieldEncoder(oid uint32, arg lit.Val) (encoder, error)
- func Open(ctx context.Context, dsn string, logger pgx.Logger) (*pgxpool.Pool, error)
- func Query(ctx context.Context, pc PC, sql string, args []lit.Val) (pgx.Rows, error)
- func Quote(text string) string
- func ScanMany(reg lit.Regs, scal bool, mut lit.Mut, rows pgx.Rows) (err error)
- func ScanOne(reg lit.Regs, scal bool, mut lit.Mut, rows pgx.Rows) error
- func TypString(t typ.Type) (string, error)
- func Unreserved(name string) (string, bool)
- func WithTx(ctx context.Context, db DB, f func(PC) error) error
- func WriteCall(w *Writer, env exp.Env, e *exp.Call) error
- func WriteExp(w *Writer, env exp.Env, e exp.Exp) error
- func WriteIdent(w bfr.Writer, name string) (err error)
- func WriteLit(b *Writer, l *exp.Lit) error
- func WriteQuote(w *Writer, text string) error
- func WriteVal(b *Writer, t typ.Type, l lit.Val) error
- type C
- type DB
- type Decoder
- type DecoderPair
- type ExpEnv
- type PC
- type Param
- type Scanner
- type Translator
- type WrapBool
- type WrapIdxr
- type WrapInt2
- type WrapInt4
- type WrapInt8
- type WrapJSON
- type WrapJSONB
- type WrapNull
- type WrapRaw
- type WrapReal4
- type WrapReal8
- type WrapSpan
- type WrapSpanTime
- type WrapStr
- type WrapTime
- type WrapTimeDate
- type WrapTimestamp
- type WrapUUID
- type Writer
Constants ¶
const ( PrecOr PrecAnd PrecNot PrecIs // , is null, is not null, … PrecCmp // <, >, =, <=, >=, <>, != PrecIn // , between, like, ilike, similar PrecDef PrecAdd // +, - PrecMul // *, /, % )
Variables ¶
var External = fmt.Errorf("external symbol")
Functions ¶
func Unreserved ¶
Unreserved returns the lowercase key and whether it is an unreserved identifier. If unreserved returns false the key must be escaped with double quotes.
func WriteCall ¶
WriteCall writes the expression e to w using env or returns an error. Most xelf expressions with resolvers from the core or lib built-ins have a corresponding expression in postgresql. Custom resolvers can be rendered to sql by detecting and handling them before calling this function.
func WriteExp ¶
WriteExp writes the element e to w or returns an error. This is used for explicit selectors for example.
func WriteQuote ¶
WriteQuote quotes a string as a postgres string, all single quotes are use sql escaping.
Types ¶
type C ¶
type C interface {
Query(context.Context, string, ...interface{}) (pgx.Rows, error)
QueryRow(context.Context, string, ...interface{}) pgx.Row
Exec(context.Context, string, ...interface{}) (pgconn.CommandTag, error)
CopyFrom(context.Context, pgx.Identifier, []string, pgx.CopyFromSource) (int64, error)
}
type Decoder ¶
Decoder is a function to decode either a text or binary postgres result to a literal.
func FieldDecoder ¶
FieldDecoder returns a decoder for the given field description fd.
type DecoderPair ¶
type DecoderPair struct{ Text, Binary Decoder }
func FieldDecoders ¶
func FieldDecoders(oid uint32) DecoderPair
type Scanner ¶
type Scanner struct {
// contains filtered or unexported fields
}
Scanner is a simplified xelf-aware Scanner for pgx rows. it avoids some hacks on my end, alleviate many extra type checks and has better null handling for my use-case.
Source Files
Directories