12d360a0c3
The 'value' interface represents a CQL value for use in a comparison, update, or intitialization operation. A consistent interface for this allows us to easily support specifying default-named, custom-named, literal, and evaluated-function values in all these contexts. Parameters to Func should probably also be values to support full composition, but that would be a breaking change because Func's properties are exposed. The value interface could itself be exposed if we wanted to allow clients to pass their own values to SetValue, etc, but for now it is a package-internal abstraction. BLA
81 lines
1.9 KiB
Go
81 lines
1.9 KiB
Go
// Copyright (C) 2017 ScyllaDB
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// Use of this source code is governed by a ALv2-style
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// license that can be found in the LICENSE file.
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package qb
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import (
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"fmt"
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"strings"
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)
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// TokenBuilder helps implement pagination using token function.
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type TokenBuilder []string
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// Token creates a new TokenBuilder.
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func Token(columns ...string) TokenBuilder {
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return TokenBuilder(columns)
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}
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// Eq produces token(column)=token(?).
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func (t TokenBuilder) Eq() Cmp {
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return t.cmp(eq, nil)
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}
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// EqNamed produces token(column)=token(?) with a custom parameter name.
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func (t TokenBuilder) EqNamed(names ...string) Cmp {
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return t.cmp(eq, names)
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}
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// Lt produces token(column)<token(?).
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func (t TokenBuilder) Lt() Cmp {
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return t.cmp(lt, nil)
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}
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// LtNamed produces token(column)<token(?) with a custom parameter name.
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func (t TokenBuilder) LtNamed(names ...string) Cmp {
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return t.cmp(lt, names)
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}
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// LtOrEq produces token(column)<=token(?).
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func (t TokenBuilder) LtOrEq() Cmp {
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return t.cmp(leq, nil)
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}
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// LtOrEqNamed produces token(column)<=token(?) with a custom parameter name.
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func (t TokenBuilder) LtOrEqNamed(names ...string) Cmp {
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return t.cmp(leq, names)
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}
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// Gt produces token(column)>token(?).
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func (t TokenBuilder) Gt() Cmp {
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return t.cmp(gt, nil)
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}
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// GtNamed produces token(column)>token(?) with a custom parameter name.
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func (t TokenBuilder) GtNamed(names ...string) Cmp {
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return t.cmp(gt, names)
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}
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// GtOrEq produces token(column)>=token(?).
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func (t TokenBuilder) GtOrEq() Cmp {
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return t.cmp(geq, nil)
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}
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// GtOrEqNamed produces token(column)>=token(?) with a custom parameter name.
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func (t TokenBuilder) GtOrEqNamed(names ...string) Cmp {
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return t.cmp(geq, names)
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}
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func (t TokenBuilder) cmp(op op, names []string) Cmp {
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s := names
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if s == nil {
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s = t
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}
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return Cmp{
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op: op,
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column: fmt.Sprint("token(", strings.Join(t, ","), ")"),
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value: Fn("token", s...),
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}
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}
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