gtsocial-umbx

query_delete.go (8343B)

---

 package bun
 
 import (
 	"context"
 	"database/sql"
 	"time"
 
 	"github.com/uptrace/bun/dialect/feature"
 	"github.com/uptrace/bun/internal"
 	"github.com/uptrace/bun/schema"
 )
 
 type DeleteQuery struct {
 	whereBaseQuery
 	returningQuery
 }
 
 var _ Query = (*DeleteQuery)(nil)
 
 func NewDeleteQuery(db *DB) *DeleteQuery {
 	q := &DeleteQuery{
 		whereBaseQuery: whereBaseQuery{
 			baseQuery: baseQuery{
 				db:   db,
 				conn: db.DB,
 			},
 		},
 	}
 	return q
 }
 
 func (q *DeleteQuery) Conn(db IConn) *DeleteQuery {
 	q.setConn(db)
 	return q
 }
 
 func (q *DeleteQuery) Model(model interface{}) *DeleteQuery {
 	q.setModel(model)
 	return q
 }
 
 func (q *DeleteQuery) Err(err error) *DeleteQuery {
 	q.setErr(err)
 	return q
 }
 
 // Apply calls the fn passing the DeleteQuery as an argument.
 func (q *DeleteQuery) Apply(fn func(*DeleteQuery) *DeleteQuery) *DeleteQuery {
 	if fn != nil {
 		return fn(q)
 	}
 	return q
 }
 
 func (q *DeleteQuery) With(name string, query schema.QueryAppender) *DeleteQuery {
 	q.addWith(name, query, false)
 	return q
 }
 
 func (q *DeleteQuery) WithRecursive(name string, query schema.QueryAppender) *DeleteQuery {
 	q.addWith(name, query, true)
 	return q
 }
 
 func (q *DeleteQuery) Table(tables ...string) *DeleteQuery {
 	for _, table := range tables {
 		q.addTable(schema.UnsafeIdent(table))
 	}
 	return q
 }
 
 func (q *DeleteQuery) TableExpr(query string, args ...interface{}) *DeleteQuery {
 	q.addTable(schema.SafeQuery(query, args))
 	return q
 }
 
 func (q *DeleteQuery) ModelTableExpr(query string, args ...interface{}) *DeleteQuery {
 	q.modelTableName = schema.SafeQuery(query, args)
 	return q
 }
 
 //------------------------------------------------------------------------------
 
 func (q *DeleteQuery) WherePK(cols ...string) *DeleteQuery {
 	q.addWhereCols(cols)
 	return q
 }
 
 func (q *DeleteQuery) Where(query string, args ...interface{}) *DeleteQuery {
 	q.addWhere(schema.SafeQueryWithSep(query, args, " AND "))
 	return q
 }
 
 func (q *DeleteQuery) WhereOr(query string, args ...interface{}) *DeleteQuery {
 	q.addWhere(schema.SafeQueryWithSep(query, args, " OR "))
 	return q
 }
 
 func (q *DeleteQuery) WhereGroup(sep string, fn func(*DeleteQuery) *DeleteQuery) *DeleteQuery {
 	saved := q.where
 	q.where = nil
 
 	q = fn(q)
 
 	where := q.where
 	q.where = saved
 
 	q.addWhereGroup(sep, where)
 
 	return q
 }
 
 func (q *DeleteQuery) WhereDeleted() *DeleteQuery {
 	q.whereDeleted()
 	return q
 }
 
 func (q *DeleteQuery) WhereAllWithDeleted() *DeleteQuery {
 	q.whereAllWithDeleted()
 	return q
 }
 
 func (q *DeleteQuery) ForceDelete() *DeleteQuery {
 	q.flags = q.flags.Set(forceDeleteFlag)
 	return q
 }
 
 //------------------------------------------------------------------------------
 
 // Returning adds a RETURNING clause to the query.
 //
 // To suppress the auto-generated RETURNING clause, use `Returning("NULL")`.
 func (q *DeleteQuery) Returning(query string, args ...interface{}) *DeleteQuery {
 	q.addReturning(schema.SafeQuery(query, args))
 	return q
 }
 
 //------------------------------------------------------------------------------
 
 func (q *DeleteQuery) Operation() string {
 	return "DELETE"
 }
 
 func (q *DeleteQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
 	if q.err != nil {
 		return nil, q.err
 	}
 
 	fmter = formatterWithModel(fmter, q)
 
 	if q.isSoftDelete() {
 		now := time.Now()
 
 		if err := q.tableModel.updateSoftDeleteField(now); err != nil {
 			return nil, err
 		}
 
 		upd := &UpdateQuery{
 			whereBaseQuery: q.whereBaseQuery,
 			returningQuery: q.returningQuery,
 		}
 		upd.Set(q.softDeleteSet(fmter, now))
 
 		return upd.AppendQuery(fmter, b)
 	}
 
 	withAlias := q.db.features.Has(feature.DeleteTableAlias)
 
 	b, err = q.appendWith(fmter, b)
 	if err != nil {
 		return nil, err
 	}
 
 	b = append(b, "DELETE FROM "...)
 
 	if withAlias {
 		b, err = q.appendFirstTableWithAlias(fmter, b)
 	} else {
 		b, err = q.appendFirstTable(fmter, b)
 	}
 	if err != nil {
 		return nil, err
 	}
 
 	if q.hasMultiTables() {
 		b = append(b, " USING "...)
 		b, err = q.appendOtherTables(fmter, b)
 		if err != nil {
 			return nil, err
 		}
 	}
 
 	if q.hasFeature(feature.Output) && q.hasReturning() {
 		b = append(b, " OUTPUT "...)
 		b, err = q.appendOutput(fmter, b)
 		if err != nil {
 			return nil, err
 		}
 	}
 
 	b, err = q.mustAppendWhere(fmter, b, withAlias)
 	if err != nil {
 		return nil, err
 	}
 
 	if q.hasFeature(feature.Returning) && q.hasReturning() {
 		b = append(b, " RETURNING "...)
 		b, err = q.appendReturning(fmter, b)
 		if err != nil {
 			return nil, err
 		}
 	}
 
 	return b, nil
 }
 
 func (q *DeleteQuery) isSoftDelete() bool {
 	return q.tableModel != nil && q.table.SoftDeleteField != nil && !q.flags.Has(forceDeleteFlag)
 }
 
 func (q *DeleteQuery) softDeleteSet(fmter schema.Formatter, tm time.Time) string {
 	b := make([]byte, 0, 32)
 	if fmter.HasFeature(feature.UpdateMultiTable) {
 		b = append(b, q.table.SQLAlias...)
 		b = append(b, '.')
 	}
 	b = append(b, q.table.SoftDeleteField.SQLName...)
 	b = append(b, " = "...)
 	b = schema.Append(fmter, b, tm)
 	return internal.String(b)
 }
 
 //------------------------------------------------------------------------------
 
 func (q *DeleteQuery) Scan(ctx context.Context, dest ...interface{}) error {
 	_, err := q.scanOrExec(ctx, dest, true)
 	return err
 }
 
 func (q *DeleteQuery) Exec(ctx context.Context, dest ...interface{}) (sql.Result, error) {
 	return q.scanOrExec(ctx, dest, len(dest) > 0)
 }
 
 func (q *DeleteQuery) scanOrExec(
 	ctx context.Context, dest []interface{}, hasDest bool,
 ) (sql.Result, error) {
 	if q.err != nil {
 		return nil, q.err
 	}
 
 	if q.table != nil {
 		if err := q.beforeDeleteHook(ctx); err != nil {
 			return nil, err
 		}
 	}
 
 	// Run append model hooks before generating the query.
 	if err := q.beforeAppendModel(ctx, q); err != nil {
 		return nil, err
 	}
 
 	// Generate the query before checking hasReturning.
 	queryBytes, err := q.AppendQuery(q.db.fmter, q.db.makeQueryBytes())
 	if err != nil {
 		return nil, err
 	}
 
 	useScan := hasDest || (q.hasReturning() && q.hasFeature(feature.Returning|feature.Output))
 	var model Model
 
 	if useScan {
 		var err error
 		model, err = q.getModel(dest)
 		if err != nil {
 			return nil, err
 		}
 	}
 
 	query := internal.String(queryBytes)
 
 	var res sql.Result
 
 	if useScan {
 		res, err = q.scan(ctx, q, query, model, hasDest)
 		if err != nil {
 			return nil, err
 		}
 	} else {
 		res, err = q.exec(ctx, q, query)
 		if err != nil {
 			return nil, err
 		}
 	}
 
 	if q.table != nil {
 		if err := q.afterDeleteHook(ctx); err != nil {
 			return nil, err
 		}
 	}
 
 	return res, nil
 }
 
 func (q *DeleteQuery) beforeDeleteHook(ctx context.Context) error {
 	if hook, ok := q.table.ZeroIface.(BeforeDeleteHook); ok {
 		if err := hook.BeforeDelete(ctx, q); err != nil {
 			return err
 		}
 	}
 	return nil
 }
 
 func (q *DeleteQuery) afterDeleteHook(ctx context.Context) error {
 	if hook, ok := q.table.ZeroIface.(AfterDeleteHook); ok {
 		if err := hook.AfterDelete(ctx, q); err != nil {
 			return err
 		}
 	}
 	return nil
 }
 
 func (q *DeleteQuery) String() string {
 	buf, err := q.AppendQuery(q.db.Formatter(), nil)
 	if err != nil {
 		panic(err)
 	}
 
 	return string(buf)
 }
 
 //------------------------------------------------------------------------------
 
 func (q *DeleteQuery) QueryBuilder() QueryBuilder {
 	return &deleteQueryBuilder{q}
 }
 
 func (q *DeleteQuery) ApplyQueryBuilder(fn func(QueryBuilder) QueryBuilder) *DeleteQuery {
 	return fn(q.QueryBuilder()).Unwrap().(*DeleteQuery)
 }
 
 type deleteQueryBuilder struct {
 	*DeleteQuery
 }
 
 func (q *deleteQueryBuilder) WhereGroup(
 	sep string, fn func(QueryBuilder) QueryBuilder,
 ) QueryBuilder {
 	q.DeleteQuery = q.DeleteQuery.WhereGroup(sep, func(qs *DeleteQuery) *DeleteQuery {
 		return fn(q).(*deleteQueryBuilder).DeleteQuery
 	})
 	return q
 }
 
 func (q *deleteQueryBuilder) Where(query string, args ...interface{}) QueryBuilder {
 	q.DeleteQuery.Where(query, args...)
 	return q
 }
 
 func (q *deleteQueryBuilder) WhereOr(query string, args ...interface{}) QueryBuilder {
 	q.DeleteQuery.WhereOr(query, args...)
 	return q
 }
 
 func (q *deleteQueryBuilder) WhereDeleted() QueryBuilder {
 	q.DeleteQuery.WhereDeleted()
 	return q
 }
 
 func (q *deleteQueryBuilder) WhereAllWithDeleted() QueryBuilder {
 	q.DeleteQuery.WhereAllWithDeleted()
 	return q
 }
 
 func (q *deleteQueryBuilder) WherePK(cols ...string) QueryBuilder {
 	q.DeleteQuery.WherePK(cols...)
 	return q
 }
 
 func (q *deleteQueryBuilder) Unwrap() interface{} {
 	return q.DeleteQuery
 }