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package schema
import (
"database/sql"
"reflect"
"sync"
"github.com/uptrace/bun/dialect"
"github.com/uptrace/bun/dialect/feature"
)
type Dialect interface {
Init(db *sql.DB)
Name() dialect.Name
Features() feature.Feature
Tables() *Tables
OnTable(table *Table)
IdentQuote() byte
Append(fmter Formatter, b []byte, v interface{}) []byte
Appender(typ reflect.Type) AppenderFunc
FieldAppender(field *Field) AppenderFunc
Scanner(typ reflect.Type) ScannerFunc
}
//------------------------------------------------------------------------------
type nopDialect struct {
tables *Tables
features feature.Feature
appenderMap sync.Map
scannerMap sync.Map
}
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) Append(fmter Formatter, b []byte, v interface{}) []byte {
return Append(fmter, b, v, nil)
}
func (d *nopDialect) Appender(typ reflect.Type) AppenderFunc {
if v, ok := d.appenderMap.Load(typ); ok {
return v.(AppenderFunc)
}
fn := Appender(typ, nil)
if v, ok := d.appenderMap.LoadOrStore(typ, fn); ok {
return v.(AppenderFunc)
}
return fn
}
func (d *nopDialect) FieldAppender(field *Field) AppenderFunc {
return FieldAppender(d, field)
}
func (d *nopDialect) Scanner(typ reflect.Type) ScannerFunc {
if v, ok := d.scannerMap.Load(typ); ok {
return v.(ScannerFunc)
}
fn := Scanner(typ)
if v, ok := d.scannerMap.LoadOrStore(typ, fn); ok {
return v.(ScannerFunc)
}
return fn
}
|
