Lightweight and fast SQL builder for Go language
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// Copyright 2016 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"
"sort"
)
// Incr implements a type used by Eq
type Incr int
// Decr implements a type used by Eq
type Decr int
// Eq defines equals conditions
type Eq map[string]interface{}
var _ Cond = Eq{}
// OpWriteTo writes conditions with special operator
func (eq Eq) OpWriteTo(op string, w Writer) error {
var i = 0
for _, k := range eq.sortedKeys() {
v := eq[k]
switch v.(type) {
case []int, []int64, []string, []int32, []int16, []int8, []uint, []uint64, []uint32, []uint16, []interface{}:
if err := In(k, v).WriteTo(w); err != nil {
return err
}
case expr:
if _, err := fmt.Fprintf(w, "%s=(", k); err != nil {
return err
}
if err := v.(expr).WriteTo(w); err != nil {
return err
}
if _, err := fmt.Fprintf(w, ")"); err != nil {
return err
}
case *Builder:
if _, err := fmt.Fprintf(w, "%s=(", k); err != nil {
return err
}
if err := v.(*Builder).WriteTo(w); err != nil {
return err
}
if _, err := fmt.Fprintf(w, ")"); err != nil {
return err
}
case Incr:
if _, err := fmt.Fprintf(w, "%s=%s+?", k, k); err != nil {
return err
}
w.Append(int(v.(Incr)))
case Decr:
if _, err := fmt.Fprintf(w, "%s=%s-?", k, k); err != nil {
return err
}
w.Append(int(v.(Decr)))
case nil:
if _, err := fmt.Fprintf(w, "%s=null", k); err != nil {
return err
}
default:
if _, err := fmt.Fprintf(w, "%s=?", k); err != nil {
return err
}
w.Append(v)
}
if i != len(eq)-1 {
if _, err := fmt.Fprint(w, op); err != nil {
return err
}
}
i = i + 1
}
return nil
}
// WriteTo writes SQL to Writer
func (eq Eq) WriteTo(w Writer) error {
return eq.OpWriteTo(" AND ", w)
}
// And implements And with other conditions
func (eq Eq) And(conds ...Cond) Cond {
return And(eq, And(conds...))
}
// Or implements Or with other conditions
func (eq Eq) Or(conds ...Cond) Cond {
return Or(eq, Or(conds...))
}
// IsValid tests if this Eq is valid
func (eq Eq) IsValid() bool {
return len(eq) > 0
}
// sortedKeys returns all keys of this Eq sorted with sort.Strings.
// It is used internally for consistent ordering when generating
// SQL, see https://gitea.com/xorm/builder/issues/10
func (eq Eq) sortedKeys() []string {
keys := make([]string, 0, len(eq))
for key := range eq {
keys = append(keys, key)
}
sort.Strings(keys)
return keys
}