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- // Copyright (c) 2012-present The upper.io/db authors. All rights reserved.
- //
- // Permission is hereby granted, free of charge, to any person obtaining
- // a copy of this software and associated documentation files (the
- // "Software"), to deal in the Software without restriction, including
- // without limitation the rights to use, copy, modify, merge, publish,
- // distribute, sublicense, and/or sell copies of the Software, and to
- // permit persons to whom the Software is furnished to do so, subject to
- // the following conditions:
- //
- // The above copyright notice and this permission notice shall be
- // included in all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
- package db
-
- // Constraint interface represents a single condition, like "a = 1". where `a`
- // is the key and `1` is the value. This is an exported interface but it's
- // rarely used directly, you may want to use the `db.Cond{}` map instead.
- type Constraint interface {
- // Key is the leftmost part of the constraint and usually contains a column
- // name.
- Key() interface{}
-
- // Value if the rightmost part of the constraint and usually contains a
- // column value.
- Value() interface{}
- }
-
- // Constraints interface represents an array or constraints, like "a = 1, b =
- // 2, c = 3".
- type Constraints interface {
- // Constraints returns an array of constraints.
- Constraints() []Constraint
- // Keys returns the map keys always in the same order.
- Keys() []interface{}
- }
-
- type constraint struct {
- k interface{}
- v interface{}
- }
-
- func (c constraint) Key() interface{} {
- return c.k
- }
-
- func (c constraint) Value() interface{} {
- return c.v
- }
-
- // NewConstraint creates a constraint.
- func NewConstraint(key interface{}, value interface{}) Constraint {
- return constraint{k: key, v: value}
- }
-
- var _ Constraints = Cond{}
-
- var _ Constraint = &constraint{}
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