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add Clone methods for query builders (#10)

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Summary:
Pull Request resolved: https://github.com/facebookincubator/ent/pull/10

Closes T46957221

Reviewed By: idoshveki

Differential Revision: D16278371

fbshipit-source-id: ca2b038fccb8fca6a7e8261444de27bdd63d0b00
This commit is contained in:
Ariel Mashraki
2019-07-16 03:29:17 -07:00
committed by Facebook Github Bot
parent b5cdb810b8
commit dbe2afb946
19 changed files with 346 additions and 48 deletions
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100
dialect/sql/builder.go
View File

@@ -9,17 +9,17 @@ import (
"fbc/ent/dialect"
)
// Node represents a builder step in the query.
type Node interface {
// Querier wraps the basic Query method.
type Querier interface {
// Query returns the query representation of the element and its arguments (if any).
Query() (string, []interface{})
}
// Nodes are list of queries join with space between them.
type Nodes []Node
// Queries are list of queries join with space between them.
type Queries []Querier
// Query returns query representation of Nodes.
func (n Nodes) Query() (string, []interface{}) {
// Query returns query representation of Queriers.
func (n Queries) Query() (string, []interface{}) {
b := Builder{}
for i := range n {
if i > 0 {
@@ -96,8 +96,8 @@ func (b *Builder) Pad() *Builder {
return b
}
// Join joins a list of Nodes to the builder.
func (b *Builder) Join(n ...Node) *Builder {
// Join joins a list of Queriers to the builder.
func (b *Builder) Join(n ...Querier) *Builder {
for i := range n {
query, args := n[i].Query()
b.WriteString(query)
@@ -106,8 +106,8 @@ func (b *Builder) Join(n ...Node) *Builder {
return b
}
// JoinComma joins a list of Nodes and adds comma between them.
func (b *Builder) JoinComma(n ...Node) *Builder {
// JoinComma joins a list of Queriers and adds comma between them.
func (b *Builder) JoinComma(n ...Querier) *Builder {
for i := range n {
if i > 0 {
b.Comma()
@@ -130,6 +130,13 @@ func (b *Builder) Nested(f func(*Builder)) *Builder {
return b
}
// clone returns a shallow clone of a builder.
func (b Builder) clone() Builder {
c := Builder{args: append([]interface{}{}, b.args...)}
c.Buffer.Write(c.Bytes())
return c
}
// ColumnBuilder is a builder for column definition in table creation.
type ColumnBuilder struct {
b Builder
@@ -177,7 +184,7 @@ type TableBuilder struct {
collation string // table collation.
columns []*ColumnBuilder // table columns.
primary []string // primary key.
constraints []Node // foreign keys and indices.
constraints []Querier // foreign keys and indices.
}
// CreateTable returns a query builder for the `CREATE TABLE` statement.
@@ -217,23 +224,23 @@ func (t *TableBuilder) PrimaryKey(column ...string) *TableBuilder {
// ForeignKeys adds a list of foreign-keys to the statement (without constraints).
func (t *TableBuilder) ForeignKeys(fks ...*ForeignKeyBuilder) *TableBuilder {
nodes := make([]Node, len(fks))
Queriers := make([]Querier, len(fks))
for i := range fks {
// erase the constraint symbol/name.
fks[i].symbol = ""
nodes[i] = fks[i]
Queriers[i] = fks[i]
}
t.constraints = append(t.constraints, nodes...)
t.constraints = append(t.constraints, Queriers...)
return t
}
// Constraints adds a list of foreign-key constraints to the statement.
func (t *TableBuilder) Constraints(fks ...*ForeignKeyBuilder) *TableBuilder {
nodes := make([]Node, len(fks))
Queriers := make([]Querier, len(fks))
for i := range fks {
nodes[i] = &Wrapper{"CONSTRAINT %s", fks[i]}
Queriers[i] = &Wrapper{"CONSTRAINT %s", fks[i]}
}
t.constraints = append(t.constraints, nodes...)
t.constraints = append(t.constraints, Queriers...)
return t
}
@@ -303,9 +310,9 @@ func (t *DescribeBuilder) Query() (string, []interface{}) {
// TableAlter is a query builder for `ALTER TABLE` statement.
type TableAlter struct {
b Builder
name string // table to alter.
nodes []Node // columns and foreign-keys to add.
b Builder
name string // table to alter.
Queriers []Querier // columns and foreign-keys to add.
}
// AlterTable returns a query builder for the `ALTER TABLE` statement.
@@ -318,19 +325,19 @@ func AlterTable(name string) *TableAlter { return &TableAlter{b: Builder{}, name
// AddColumn appends the `ADD COLUMN` clause to the given `ALTER TABLE` statement.
func (t *TableAlter) AddColumn(c *ColumnBuilder) *TableAlter {
t.nodes = append(t.nodes, &Wrapper{"ADD COLUMN %s", c})
t.Queriers = append(t.Queriers, &Wrapper{"ADD COLUMN %s", c})
return t
}
// Modify appends the `MODIFY COLUMN` clause to the given `ALTER TABLE` statement.
func (t *TableAlter) ModifyColumn(c *ColumnBuilder) *TableAlter {
t.nodes = append(t.nodes, &Wrapper{"MODIFY COLUMN %s", c})
t.Queriers = append(t.Queriers, &Wrapper{"MODIFY COLUMN %s", c})
return t
}
// AddForeignKey adds a foreign key constraint to the `ALTER TABLE` statement.
func (t *TableAlter) AddForeignKey(fk *ForeignKeyBuilder) *TableAlter {
t.nodes = append(t.nodes, &Wrapper{"ADD CONSTRAINT %s", fk})
t.Queriers = append(t.Queriers, &Wrapper{"ADD CONSTRAINT %s", fk})
return t
}
@@ -339,7 +346,7 @@ func (t *TableAlter) Query() (string, []interface{}) {
t.b.WriteString("ALTER TABLE ")
t.b.Append(t.name)
t.b.Pad()
t.b.JoinComma(t.nodes...)
t.b.JoinComma(t.Queriers...)
return t.b.String(), t.b.args
}
@@ -921,6 +928,14 @@ func (p *Predicate) merge(pred *Predicate) *Predicate {
return p
}
// clone returns a shallow clone of p.
func (p *Predicate) clone() *Predicate {
if p == nil {
return p
}
return &Predicate{p.b.clone()}
}
// TableView is a view that returns a table view. Can ne a Table, Selector or a View (WITH statement).
type TableView interface {
view()
@@ -1201,6 +1216,29 @@ func (s *Selector) Count(columns ...string) *Selector {
return s
}
// Clone returns a duplicate of the selector, including all associated steps. It can be
// used to prepare common SELECT statements and use them differently after the clone is made.
func (s *Selector) Clone() *Selector {
if s == nil {
return nil
}
return &Selector{
as: s.as,
or: s.or,
not: s.not,
from: s.from,
limit: s.limit,
offset: s.offset,
distinct: s.distinct,
where: s.where.clone(),
having: s.having.clone(),
joins: append([]join{}, s.joins...),
group: append([]string{}, s.group...),
order: append([]string{}, s.order...),
columns: append([]string{}, s.columns...),
}
}
// Asc adds the ASC suffix for the given column.
func Asc(column string) string {
b := Builder{}
@@ -1280,7 +1318,7 @@ func (s *Selector) Query() (string, []interface{}) {
b.WriteString(query)
b.args = append(b.args, args...)
}
if s.order != nil {
if len(s.order) > 0 {
b.WriteString(" ORDER BY ")
b.AppendComma(s.order...)
}
@@ -1307,7 +1345,7 @@ type WithBuilder struct {
// With returns a new builder for the `WITH` statement.
//
// n := Nodes{With("users_view").As(Select().From(Table("users"))), Select().From(Table("users_view"))}
// n := Queriers{With("users_view").As(Select().From(Table("users"))), Select().From(Table("users_view"))}
// return n.Query()
//
func With(name string) *WithBuilder {
@@ -1336,21 +1374,21 @@ func (w *WithBuilder) Query() (string, []interface{}) {
// implement the table view interface.
func (*WithBuilder) view() {}
// Wrapper wraps a given node with different format.
// Wrapper wraps a given Querier with different format.
// Used to prefix/suffix other queries.
type Wrapper struct {
format string
wrapped Node
wrapped Querier
}
// Query returns query representation of a wrapped node.
// Query returns query representation of a wrapped Querier.
func (w *Wrapper) Query() (string, []interface{}) {
query, args := w.wrapped.Query()
return fmt.Sprintf(w.format, query), args
}
// Raw returns a raw sql node that is placed as-is in the query.
func Raw(s string) Node { return &raw{s} }
// Raw returns a raw sql Querier that is placed as-is in the query.
func Raw(s string) Querier { return &raw{s} }
type raw struct{ s string }