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_drop.go

@@ -0,0 +1,137 @@
+package bun
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/uptrace/bun/internal"
+	"github.com/uptrace/bun/schema"
+)
+
+type DropTableQuery struct {
+	baseQuery
+	cascadeQuery
+
+	ifExists bool
+}
+
+func NewDropTableQuery(db *DB) *DropTableQuery {
+	q := &DropTableQuery{
+		baseQuery: baseQuery{
+			db:   db,
+			conn: db.DB,
+		},
+	}
+	return q
+}
+
+func (q *DropTableQuery) Conn(db IConn) *DropTableQuery {
+	q.setConn(db)
+	return q
+}
+
+func (q *DropTableQuery) Model(model interface{}) *DropTableQuery {
+	q.setTableModel(model)
+	return q
+}
+
+//------------------------------------------------------------------------------
+
+func (q *DropTableQuery) Table(tables ...string) *DropTableQuery {
+	for _, table := range tables {
+		q.addTable(schema.UnsafeIdent(table))
+	}
+	return q
+}
+
+func (q *DropTableQuery) TableExpr(query string, args ...interface{}) *DropTableQuery {
+	q.addTable(schema.SafeQuery(query, args))
+	return q
+}
+
+func (q *DropTableQuery) ModelTableExpr(query string, args ...interface{}) *DropTableQuery {
+	q.modelTable = schema.SafeQuery(query, args)
+	return q
+}
+
+//------------------------------------------------------------------------------
+
+func (q *DropTableQuery) IfExists() *DropTableQuery {
+	q.ifExists = true
+	return q
+}
+
+func (q *DropTableQuery) Restrict() *DropTableQuery {
+	q.restrict = true
+	return q
+}
+
+//------------------------------------------------------------------------------
+
+func (q *DropTableQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
+	if q.err != nil {
+		return nil, q.err
+	}
+
+	b = append(b, "DROP TABLE "...)
+	if q.ifExists {
+		b = append(b, "IF EXISTS "...)
+	}
+
+	b, err = q.appendTables(fmter, b)
+	if err != nil {
+		return nil, err
+	}
+
+	b = q.appendCascade(fmter, b)
+
+	return b, nil
+}
+
+//------------------------------------------------------------------------------
+
+func (q *DropTableQuery) Exec(ctx context.Context, dest ...interface{}) (sql.Result, error) {
+	if q.table != nil {
+		if err := q.beforeDropTableHook(ctx); err != nil {
+			return nil, err
+		}
+	}
+
+	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
+	}
+
+	if q.table != nil {
+		if err := q.afterDropTableHook(ctx); err != nil {
+			return nil, err
+		}
+	}
+
+	return res, nil
+}
+
+func (q *DropTableQuery) beforeDropTableHook(ctx context.Context) error {
+	if hook, ok := q.table.ZeroIface.(BeforeDropTableHook); ok {
+		if err := hook.BeforeDropTable(ctx, q); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (q *DropTableQuery) afterDropTableHook(ctx context.Context) error {
+	if hook, ok := q.table.ZeroIface.(AfterDropTableHook); ok {
+		if err := hook.AfterDropTable(ctx, q); err != nil {
+			return err
+		}
+	}
+	return nil
+}