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forgejo/vendor/xorm.io/builder/builder_limit.go
Lunny Xiao c61b902538
Upgrade xorm to v1.0.0 (#10646)
* Upgrade xorm to v1.0.0

* small nit

* Fix tests

* Update xorm

* Update xorm

* fix go.sum

* fix test

* Fix bug when dump

* Fix bug

* update xorm to latest

* Fix migration test

* update xorm to latest

* Fix import order

* Use xorm tag
2020-03-22 11:12:55 -04:00

103 lines
2.5 KiB
Go
Vendored

// Copyright 2018 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package builder
import (
"fmt"
"strings"
)
func (b *Builder) limitWriteTo(w Writer) error {
if strings.TrimSpace(b.dialect) == "" {
return ErrDialectNotSetUp
}
if b.limitation != nil {
limit := b.limitation
if limit.offset < 0 || limit.limitN <= 0 {
return ErrInvalidLimitation
}
// erase limit condition
b.limitation = nil
defer func() {
b.limitation = limit
}()
ow := w.(*BytesWriter)
switch strings.ToLower(strings.TrimSpace(b.dialect)) {
case ORACLE:
if len(b.selects) == 0 {
b.selects = append(b.selects, "*")
}
var final *Builder
selects := b.selects
b.selects = append(selects, "ROWNUM RN")
var wb *Builder
if b.optype == setOpType {
wb = Dialect(b.dialect).Select("at.*", "ROWNUM RN").
From(b, "at")
} else {
wb = b
}
if limit.offset == 0 {
final = Dialect(b.dialect).Select(selects...).From(wb, "at").
Where(Lte{"at.RN": limit.limitN})
} else {
sub := Dialect(b.dialect).Select("*").
From(b, "at").Where(Lte{"at.RN": limit.offset + limit.limitN})
final = Dialect(b.dialect).Select(selects...).From(sub, "att").
Where(Gt{"att.RN": limit.offset})
}
return final.WriteTo(ow)
case SQLITE, MYSQL, POSTGRES:
// if type UNION, we need to write previous content back to current writer
if b.optype == setOpType {
if err := b.WriteTo(ow); err != nil {
return err
}
}
if limit.offset == 0 {
fmt.Fprint(ow, " LIMIT ", limit.limitN)
} else {
fmt.Fprintf(ow, " LIMIT %v OFFSET %v", limit.limitN, limit.offset)
}
case MSSQL:
if len(b.selects) == 0 {
b.selects = append(b.selects, "*")
}
var final *Builder
selects := b.selects
b.selects = append(append([]string{fmt.Sprintf("TOP %d %v", limit.limitN+limit.offset, b.selects[0])},
b.selects[1:]...), "ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS RN")
var wb *Builder
if b.optype == setOpType {
wb = Dialect(b.dialect).Select("*", "ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS RN").
From(b, "at")
} else {
wb = b
}
if limit.offset == 0 {
final = Dialect(b.dialect).Select(selects...).From(wb, "at")
} else {
final = Dialect(b.dialect).Select(selects...).From(wb, "at").Where(Gt{"at.RN": limit.offset})
}
return final.WriteTo(ow)
default:
return ErrNotSupportType
}
}
return nil
}