Pg to bun (#148)

* start moving to bun

* changing more stuff

* more

* and yet more

* tests passing

* seems stable now

* more big changes

* small fix

* little fixes

vendor/github.com/uptrace/bun/query_table_truncate.go

@@ -0,0 +1,121 @@
+package bun
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/uptrace/bun/dialect/feature"
+	"github.com/uptrace/bun/internal"
+	"github.com/uptrace/bun/schema"
+)
+
+type TruncateTableQuery struct {
+	baseQuery
+	cascadeQuery
+
+	continueIdentity bool
+}
+
+func NewTruncateTableQuery(db *DB) *TruncateTableQuery {
+	q := &TruncateTableQuery{
+		baseQuery: baseQuery{
+			db:   db,
+			conn: db.DB,
+		},
+	}
+	return q
+}
+
+func (q *TruncateTableQuery) Conn(db IConn) *TruncateTableQuery {
+	q.setConn(db)
+	return q
+}
+
+func (q *TruncateTableQuery) Model(model interface{}) *TruncateTableQuery {
+	q.setTableModel(model)
+	return q
+}
+
+//------------------------------------------------------------------------------
+
+func (q *TruncateTableQuery) Table(tables ...string) *TruncateTableQuery {
+	for _, table := range tables {
+		q.addTable(schema.UnsafeIdent(table))
+	}
+	return q
+}
+
+func (q *TruncateTableQuery) TableExpr(query string, args ...interface{}) *TruncateTableQuery {
+	q.addTable(schema.SafeQuery(query, args))
+	return q
+}
+
+//------------------------------------------------------------------------------
+
+func (q *TruncateTableQuery) ContinueIdentity() *TruncateTableQuery {
+	q.continueIdentity = true
+	return q
+}
+
+func (q *TruncateTableQuery) Restrict() *TruncateTableQuery {
+	q.restrict = true
+	return q
+}
+
+//------------------------------------------------------------------------------
+
+func (q *TruncateTableQuery) AppendQuery(
+	fmter schema.Formatter, b []byte,
+) (_ []byte, err error) {
+	if q.err != nil {
+		return nil, q.err
+	}
+
+	if !fmter.HasFeature(feature.TableTruncate) {
+		b = append(b, "DELETE FROM "...)
+
+		b, err = q.appendTables(fmter, b)
+		if err != nil {
+			return nil, err
+		}
+
+		return b, nil
+	}
+
+	b = append(b, "TRUNCATE TABLE "...)
+
+	b, err = q.appendTables(fmter, b)
+	if err != nil {
+		return nil, err
+	}
+
+	if q.db.features.Has(feature.TableIdentity) {
+		if q.continueIdentity {
+			b = append(b, " CONTINUE IDENTITY"...)
+		} else {
+			b = append(b, " RESTART IDENTITY"...)
+		}
+	}
+
+	b = q.appendCascade(fmter, b)
+
+	return b, nil
+}
+
+//------------------------------------------------------------------------------
+
+func (q *TruncateTableQuery) Exec(ctx context.Context, dest ...interface{}) (sql.Result, error) {
+	queryBytes, err := q.AppendQuery(q.db.fmter, q.db.makeQueryBytes())
+	if err != nil {
+		return nil, err
+	}
+
+	query := internal.String(queryBytes)
+
+	res, err := q.exec(ctx, q, query)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}