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package schema
import (
"database/sql"
"encoding/hex"
"strconv"
"time"
"unicode/utf8"
"github.com/uptrace/bun/dialect"
"github.com/uptrace/bun/dialect/feature"
"github.com/uptrace/bun/internal/parser"
)
type Dialect interface {
Init(db *sql.DB)
Name() dialect.Name
Features() feature.Feature
Tables() *Tables
OnTable(table *Table)
IdentQuote() byte
AppendUint32(b []byte, n uint32) []byte
AppendUint64(b []byte, n uint64) []byte
AppendTime(b []byte, tm time.Time) []byte
AppendString(b []byte, s string) []byte
AppendBytes(b []byte, bs []byte) []byte
AppendJSON(b, jsonb []byte) []byte
AppendBool(b []byte, v bool) []byte
// DefaultVarcharLen should be returned for dialects in which specifying VARCHAR length
// is mandatory in queries that modify the schema (CREATE TABLE / ADD COLUMN, etc).
// Dialects that do not have such requirement may return 0, which should be interpreted so by the caller.
DefaultVarcharLen() int
}
// ------------------------------------------------------------------------------
type BaseDialect struct{}
func (BaseDialect) AppendUint32(b []byte, n uint32) []byte {
return strconv.AppendUint(b, uint64(n), 10)
}
func (BaseDialect) AppendUint64(b []byte, n uint64) []byte {
return strconv.AppendUint(b, n, 10)
}
func (BaseDialect) AppendTime(b []byte, tm time.Time) []byte {
b = append(b, '\'')
b = tm.UTC().AppendFormat(b, "2006-01-02 15:04:05.999999-07:00")
b = append(b, '\'')
return b
}
func (BaseDialect) AppendString(b []byte, s string) []byte {
b = append(b, '\'')
for _, r := range s {
if r == '\000' {
continue
}
if r == '\'' {
b = append(b, '\'', '\'')
continue
}
if r < utf8.RuneSelf {
b = append(b, byte(r))
continue
}
l := len(b)
if cap(b)-l < utf8.UTFMax {
b = append(b, make([]byte, utf8.UTFMax)...)
}
n := utf8.EncodeRune(b[l:l+utf8.UTFMax], r)
b = b[:l+n]
}
b = append(b, '\'')
return b
}
func (BaseDialect) AppendBytes(b, bs []byte) []byte {
if bs == nil {
return dialect.AppendNull(b)
}
b = append(b, `'\x`...)
s := len(b)
b = append(b, make([]byte, hex.EncodedLen(len(bs)))...)
hex.Encode(b[s:], bs)
b = append(b, '\'')
return b
}
func (BaseDialect) AppendJSON(b, jsonb []byte) []byte {
b = append(b, '\'')
p := parser.New(jsonb)
for p.Valid() {
c := p.Read()
switch c {
case '"':
b = append(b, '"')
case '\'':
b = append(b, "''"...)
case '\000':
continue
case '\\':
if p.SkipBytes([]byte("u0000")) {
b = append(b, `\\u0000`...)
} else {
b = append(b, '\\')
if p.Valid() {
b = append(b, p.Read())
}
}
default:
b = append(b, c)
}
}
b = append(b, '\'')
return b
}
func (BaseDialect) AppendBool(b []byte, v bool) []byte {
return dialect.AppendBool(b, v)
}
// ------------------------------------------------------------------------------
type nopDialect struct {
BaseDialect
tables *Tables
features feature.Feature
}
func newNopDialect() *nopDialect {
d := new(nopDialect)
d.tables = NewTables(d)
d.features = feature.Returning
return d
}
func (d *nopDialect) Init(*sql.DB) {}
func (d *nopDialect) Name() dialect.Name {
return dialect.Invalid
}
func (d *nopDialect) Features() feature.Feature {
return d.features
}
func (d *nopDialect) Tables() *Tables {
return d.tables
}
func (d *nopDialect) OnField(field *Field) {}
func (d *nopDialect) OnTable(table *Table) {}
func (d *nopDialect) IdentQuote() byte {
return '"'
}
func (d *nopDialect) DefaultVarcharLen() int {
return 0
}
|
