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package pgdialect
import (
"database/sql"
"fmt"
"strconv"
"strings"
"github.com/uptrace/bun"
"github.com/uptrace/bun/dialect"
"github.com/uptrace/bun/dialect/feature"
"github.com/uptrace/bun/dialect/sqltype"
"github.com/uptrace/bun/migrate/sqlschema"
"github.com/uptrace/bun/schema"
)
var pgDialect = New()
func init() {
if Version() != bun.Version() {
panic(fmt.Errorf("pgdialect and Bun must have the same version: v%s != v%s",
Version(), bun.Version()))
}
}
type Dialect struct {
schema.BaseDialect
tables *schema.Tables
features feature.Feature
uintAsInt bool
}
var _ schema.Dialect = (*Dialect)(nil)
var _ sqlschema.InspectorDialect = (*Dialect)(nil)
var _ sqlschema.MigratorDialect = (*Dialect)(nil)
func New(opts ...DialectOption) *Dialect {
d := new(Dialect)
d.tables = schema.NewTables(d)
d.features = feature.CTE |
feature.WithValues |
feature.Returning |
feature.InsertReturning |
feature.DefaultPlaceholder |
feature.DoubleColonCast |
feature.InsertTableAlias |
feature.UpdateTableAlias |
feature.DeleteTableAlias |
feature.TableCascade |
feature.TableIdentity |
feature.TableTruncate |
feature.TableNotExists |
feature.InsertOnConflict |
feature.SelectExists |
feature.GeneratedIdentity |
feature.CompositeIn |
feature.DeleteReturning |
feature.AlterColumnExists
for _, opt := range opts {
opt(d)
}
return d
}
type DialectOption func(d *Dialect)
func WithoutFeature(other feature.Feature) DialectOption {
return func(d *Dialect) {
d.features = d.features.Remove(other)
}
}
func WithAppendUintAsInt(on bool) DialectOption {
return func(d *Dialect) {
d.uintAsInt = on
}
}
func (d *Dialect) Init(*sql.DB) {}
func (d *Dialect) Name() dialect.Name {
return dialect.PG
}
func (d *Dialect) Features() feature.Feature {
return d.features
}
func (d *Dialect) Tables() *schema.Tables {
return d.tables
}
func (d *Dialect) OnTable(table *schema.Table) {
for _, field := range table.FieldMap {
d.onField(field)
}
}
func (d *Dialect) onField(field *schema.Field) {
field.DiscoveredSQLType = fieldSQLType(field)
if field.AutoIncrement && !field.Identity {
switch field.DiscoveredSQLType {
case sqltype.SmallInt:
field.CreateTableSQLType = pgTypeSmallSerial
case sqltype.Integer:
field.CreateTableSQLType = pgTypeSerial
case sqltype.BigInt:
field.CreateTableSQLType = pgTypeBigSerial
}
}
if field.Tag.HasOption("array") || strings.HasSuffix(field.UserSQLType, "[]") {
field.Append = d.arrayAppender(field.StructField.Type)
field.Scan = arrayScanner(field.StructField.Type)
return
}
if field.Tag.HasOption("multirange") {
field.Append = d.arrayAppender(field.StructField.Type)
field.Scan = arrayScanner(field.StructField.Type)
return
}
switch field.DiscoveredSQLType {
case sqltype.HSTORE:
field.Append = d.hstoreAppender(field.StructField.Type)
field.Scan = hstoreScanner(field.StructField.Type)
}
}
func (d *Dialect) IdentQuote() byte {
return '"'
}
func (d *Dialect) AppendUint32(b []byte, n uint32) []byte {
if d.uintAsInt {
return strconv.AppendInt(b, int64(int32(n)), 10)
}
return strconv.AppendUint(b, uint64(n), 10)
}
func (d *Dialect) AppendUint64(b []byte, n uint64) []byte {
if d.uintAsInt {
return strconv.AppendInt(b, int64(n), 10)
}
return strconv.AppendUint(b, n, 10)
}
func (d *Dialect) AppendSequence(b []byte, _ *schema.Table, _ *schema.Field) []byte {
return appendGeneratedAsIdentity(b)
}
// appendGeneratedAsIdentity appends GENERATED BY DEFAULT AS IDENTITY to the column definition.
func appendGeneratedAsIdentity(b []byte) []byte {
return append(b, " GENERATED BY DEFAULT AS IDENTITY"...)
}
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