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/schema/sqlfmt.go

@@ -0,0 +1,76 @@
+package schema
+
+type QueryAppender interface {
+	AppendQuery(fmter Formatter, b []byte) ([]byte, error)
+}
+
+type ColumnsAppender interface {
+	AppendColumns(fmter Formatter, b []byte) ([]byte, error)
+}
+
+//------------------------------------------------------------------------------
+
+// Safe represents a safe SQL query.
+type Safe string
+
+var _ QueryAppender = (*Safe)(nil)
+
+func (s Safe) AppendQuery(fmter Formatter, b []byte) ([]byte, error) {
+	return append(b, s...), nil
+}
+
+//------------------------------------------------------------------------------
+
+// Ident represents a SQL identifier, for example, table or column name.
+type Ident string
+
+var _ QueryAppender = (*Ident)(nil)
+
+func (s Ident) AppendQuery(fmter Formatter, b []byte) ([]byte, error) {
+	return fmter.AppendIdent(b, string(s)), nil
+}
+
+//------------------------------------------------------------------------------
+
+type QueryWithArgs struct {
+	Query string
+	Args  []interface{}
+}
+
+var _ QueryAppender = QueryWithArgs{}
+
+func SafeQuery(query string, args []interface{}) QueryWithArgs {
+	if query != "" && args == nil {
+		args = make([]interface{}, 0)
+	}
+	return QueryWithArgs{Query: query, Args: args}
+}
+
+func UnsafeIdent(ident string) QueryWithArgs {
+	return QueryWithArgs{Query: ident}
+}
+
+func (q QueryWithArgs) IsZero() bool {
+	return q.Query == "" && q.Args == nil
+}
+
+func (q QueryWithArgs) AppendQuery(fmter Formatter, b []byte) ([]byte, error) {
+	if q.Args == nil {
+		return fmter.AppendIdent(b, q.Query), nil
+	}
+	return fmter.AppendQuery(b, q.Query, q.Args...), nil
+}
+
+//------------------------------------------------------------------------------
+
+type QueryWithSep struct {
+	QueryWithArgs
+	Sep string
+}
+
+func SafeQueryWithSep(query string, args []interface{}, sep string) QueryWithSep {
+	return QueryWithSep{
+		QueryWithArgs: SafeQuery(query, args),
+		Sep:           sep,
+	}
+}