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update.go
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update.go
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// Copyright 2018 Huan Du. All rights reserved.
// Licensed under the MIT license that can be found in the LICENSE file.
package sqlbuilder
import (
"fmt"
"strconv"
)
const (
updateMarkerInit injectionMarker = iota
updateMarkerAfterWith
updateMarkerAfterUpdate
updateMarkerAfterSet
updateMarkerAfterWhere
updateMarkerAfterOrderBy
updateMarkerAfterLimit
)
// NewUpdateBuilder creates a new UPDATE builder.
func NewUpdateBuilder() *UpdateBuilder {
return DefaultFlavor.NewUpdateBuilder()
}
func newUpdateBuilder() *UpdateBuilder {
args := &Args{}
proxy := &whereClauseProxy{}
return &UpdateBuilder{
whereClauseProxy: proxy,
whereClauseExpr: args.Add(proxy),
Cond: Cond{
Args: args,
},
limit: -1,
args: args,
injection: newInjection(),
}
}
// UpdateBuilder is a builder to build UPDATE.
type UpdateBuilder struct {
*WhereClause
Cond
whereClauseProxy *whereClauseProxy
whereClauseExpr string
cteBuilder string
table string
assignments []string
orderByCols []string
order string
limit int
args *Args
injection *injection
marker injectionMarker
}
var _ Builder = new(UpdateBuilder)
// Update sets table name in UPDATE.
func Update(table string) *UpdateBuilder {
return DefaultFlavor.NewUpdateBuilder().Update(table)
}
// With sets WITH clause (the Common Table Expression) before UPDATE.
func (ub *UpdateBuilder) With(builder *CTEBuilder) *UpdateBuilder {
ub.marker = updateMarkerAfterWith
ub.cteBuilder = ub.Var(builder)
return ub
}
// Update sets table name in UPDATE.
func (ub *UpdateBuilder) Update(table string) *UpdateBuilder {
ub.table = Escape(table)
ub.marker = updateMarkerAfterUpdate
return ub
}
// Set sets the assignments in SET.
func (ub *UpdateBuilder) Set(assignment ...string) *UpdateBuilder {
ub.assignments = assignment
ub.marker = updateMarkerAfterSet
return ub
}
// SetMore appends the assignments in SET.
func (ub *UpdateBuilder) SetMore(assignment ...string) *UpdateBuilder {
ub.assignments = append(ub.assignments, assignment...)
ub.marker = updateMarkerAfterSet
return ub
}
// Where sets expressions of WHERE in UPDATE.
func (ub *UpdateBuilder) Where(andExpr ...string) *UpdateBuilder {
if len(andExpr) == 0 {
return ub
}
if ub.WhereClause == nil {
ub.WhereClause = NewWhereClause()
}
ub.WhereClause.AddWhereExpr(ub.args, andExpr...)
ub.marker = updateMarkerAfterWhere
return ub
}
// AddWhereClause adds all clauses in the whereClause to SELECT.
func (ub *UpdateBuilder) AddWhereClause(whereClause *WhereClause) *UpdateBuilder {
if ub.WhereClause == nil {
ub.WhereClause = NewWhereClause()
}
ub.WhereClause.AddWhereClause(whereClause)
return ub
}
// Assign represents SET "field = value" in UPDATE.
func (ub *UpdateBuilder) Assign(field string, value interface{}) string {
return fmt.Sprintf("%s = %s", Escape(field), ub.args.Add(value))
}
// Incr represents SET "field = field + 1" in UPDATE.
func (ub *UpdateBuilder) Incr(field string) string {
f := Escape(field)
return fmt.Sprintf("%s = %s + 1", f, f)
}
// Decr represents SET "field = field - 1" in UPDATE.
func (ub *UpdateBuilder) Decr(field string) string {
f := Escape(field)
return fmt.Sprintf("%s = %s - 1", f, f)
}
// Add represents SET "field = field + value" in UPDATE.
func (ub *UpdateBuilder) Add(field string, value interface{}) string {
f := Escape(field)
return fmt.Sprintf("%s = %s + %s", f, f, ub.args.Add(value))
}
// Sub represents SET "field = field - value" in UPDATE.
func (ub *UpdateBuilder) Sub(field string, value interface{}) string {
f := Escape(field)
return fmt.Sprintf("%s = %s - %s", f, f, ub.args.Add(value))
}
// Mul represents SET "field = field * value" in UPDATE.
func (ub *UpdateBuilder) Mul(field string, value interface{}) string {
f := Escape(field)
return fmt.Sprintf("%s = %s * %s", f, f, ub.args.Add(value))
}
// Div represents SET "field = field / value" in UPDATE.
func (ub *UpdateBuilder) Div(field string, value interface{}) string {
f := Escape(field)
return fmt.Sprintf("%s = %s / %s", f, f, ub.args.Add(value))
}
// OrderBy sets columns of ORDER BY in UPDATE.
func (ub *UpdateBuilder) OrderBy(col ...string) *UpdateBuilder {
ub.orderByCols = col
ub.marker = updateMarkerAfterOrderBy
return ub
}
// Asc sets order of ORDER BY to ASC.
func (ub *UpdateBuilder) Asc() *UpdateBuilder {
ub.order = "ASC"
ub.marker = updateMarkerAfterOrderBy
return ub
}
// Desc sets order of ORDER BY to DESC.
func (ub *UpdateBuilder) Desc() *UpdateBuilder {
ub.order = "DESC"
ub.marker = updateMarkerAfterOrderBy
return ub
}
// Limit sets the LIMIT in UPDATE.
func (ub *UpdateBuilder) Limit(limit int) *UpdateBuilder {
ub.limit = limit
ub.marker = updateMarkerAfterLimit
return ub
}
// NumAssignment returns the number of assignments to update.
func (ub *UpdateBuilder) NumAssignment() int {
return len(ub.assignments)
}
// String returns the compiled UPDATE string.
func (ub *UpdateBuilder) String() string {
s, _ := ub.Build()
return s
}
// Build returns compiled UPDATE string and args.
// They can be used in `DB#Query` of package `database/sql` directly.
func (ub *UpdateBuilder) Build() (sql string, args []interface{}) {
return ub.BuildWithFlavor(ub.args.Flavor)
}
// BuildWithFlavor returns compiled UPDATE string and args with flavor and initial args.
// They can be used in `DB#Query` of package `database/sql` directly.
func (ub *UpdateBuilder) BuildWithFlavor(flavor Flavor, initialArg ...interface{}) (sql string, args []interface{}) {
buf := newStringBuilder()
ub.injection.WriteTo(buf, updateMarkerInit)
if ub.cteBuilder != "" {
buf.WriteLeadingString(ub.cteBuilder)
ub.injection.WriteTo(buf, updateMarkerAfterWith)
}
if len(ub.table) > 0 {
buf.WriteLeadingString("UPDATE ")
buf.WriteString(ub.table)
}
ub.injection.WriteTo(buf, updateMarkerAfterUpdate)
if len(ub.assignments) > 0 {
buf.WriteLeadingString("SET ")
buf.WriteStrings(ub.assignments, ", ")
}
ub.injection.WriteTo(buf, updateMarkerAfterSet)
if ub.WhereClause != nil {
ub.whereClauseProxy.WhereClause = ub.WhereClause
defer func() {
ub.whereClauseProxy.WhereClause = nil
}()
buf.WriteLeadingString(ub.whereClauseExpr)
ub.injection.WriteTo(buf, updateMarkerAfterWhere)
}
if len(ub.orderByCols) > 0 {
buf.WriteLeadingString("ORDER BY ")
buf.WriteStrings(ub.orderByCols, ", ")
if ub.order != "" {
buf.WriteLeadingString(ub.order)
}
ub.injection.WriteTo(buf, updateMarkerAfterOrderBy)
}
if ub.limit >= 0 {
buf.WriteLeadingString("LIMIT ")
buf.WriteString(strconv.Itoa(ub.limit))
ub.injection.WriteTo(buf, updateMarkerAfterLimit)
}
return ub.args.CompileWithFlavor(buf.String(), flavor, initialArg...)
}
// SetFlavor sets the flavor of compiled sql.
func (ub *UpdateBuilder) SetFlavor(flavor Flavor) (old Flavor) {
old = ub.args.Flavor
ub.args.Flavor = flavor
return
}
// SQL adds an arbitrary sql to current position.
func (ub *UpdateBuilder) SQL(sql string) *UpdateBuilder {
ub.injection.SQL(ub.marker, sql)
return ub
}