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_index_drop.go

@@ -0,0 +1,105 @@
+package bun
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/uptrace/bun/internal"
+	"github.com/uptrace/bun/schema"
+)
+
+type DropIndexQuery struct {
+	baseQuery
+	cascadeQuery
+
+	concurrently bool
+	ifExists     bool
+
+	index schema.QueryWithArgs
+}
+
+func NewDropIndexQuery(db *DB) *DropIndexQuery {
+	q := &DropIndexQuery{
+		baseQuery: baseQuery{
+			db:   db,
+			conn: db.DB,
+		},
+	}
+	return q
+}
+
+func (q *DropIndexQuery) Conn(db IConn) *DropIndexQuery {
+	q.setConn(db)
+	return q
+}
+
+func (q *DropIndexQuery) Model(model interface{}) *DropIndexQuery {
+	q.setTableModel(model)
+	return q
+}
+
+//------------------------------------------------------------------------------
+
+func (q *DropIndexQuery) Concurrently() *DropIndexQuery {
+	q.concurrently = true
+	return q
+}
+
+func (q *DropIndexQuery) IfExists() *DropIndexQuery {
+	q.ifExists = true
+	return q
+}
+
+func (q *DropIndexQuery) Restrict() *DropIndexQuery {
+	q.restrict = true
+	return q
+}
+
+func (q *DropIndexQuery) Index(query string, args ...interface{}) *DropIndexQuery {
+	q.index = schema.SafeQuery(query, args)
+	return q
+}
+
+//------------------------------------------------------------------------------
+
+func (q *DropIndexQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
+	if q.err != nil {
+		return nil, q.err
+	}
+
+	b = append(b, "DROP INDEX "...)
+
+	if q.concurrently {
+		b = append(b, "CONCURRENTLY "...)
+	}
+	if q.ifExists {
+		b = append(b, "IF EXISTS "...)
+	}
+
+	b, err = q.index.AppendQuery(fmter, b)
+	if err != nil {
+		return nil, err
+	}
+
+	b = q.appendCascade(fmter, b)
+
+	return b, nil
+}
+
+//------------------------------------------------------------------------------
+
+func (q *DropIndexQuery) 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
+}