/
join.go
75 lines (66 loc) · 1.63 KB
/
join.go
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package hdboil
import (
"fmt"
"github.com/volatiletech/sqlboiler/v4/queries/qm"
"strings"
)
type joinKind int
const (
joinKindUnknown joinKind = iota
joinKindInner
joinKindLeft
joinKindRight
)
type joinClause struct {
kind joinKind
joinTable string
asTable string
clauses []string
}
func InnerJoin(joinTable string, args ...string) *joinClause {
var asTable string
if len(args) > 0 {
asTable = args[0]
}
return &joinClause{
kind: joinKindInner,
joinTable: joinTable,
asTable: asTable,
clauses: make([]string, 0),
}
}
func LeftJoin(joinTable string, args ...string) *joinClause {
var asTable string
if len(args) > 0 {
asTable = args[0]
}
return &joinClause{
kind: joinKindLeft,
joinTable: joinTable,
asTable: asTable,
clauses: make([]string, 0),
}
}
func (j *joinClause) On(columnOrTableColumn, thatTableColumn string) *joinClause {
if j.asTable != "" {
j.clauses = append(j.clauses, fmt.Sprintf("%s AS %s ON %s.%s=%s", j.joinTable, j.asTable, j.asTable, columnOrTableColumn, thatTableColumn))
} else {
j.clauses = append(j.clauses, fmt.Sprintf("%s ON %s=%s", j.joinTable, columnOrTableColumn, thatTableColumn))
}
return j
}
func (j *joinClause) And(clause string) *joinClause {
j.clauses = append(j.clauses, clause)
return j
}
func (j *joinClause) Output(args ...any) qm.QueryMod {
switch j.kind {
case joinKindInner:
return qm.InnerJoin(strings.Join(j.clauses, " AND "), args...)
case joinKindLeft:
return qm.LeftOuterJoin(strings.Join(j.clauses, " AND "), args...)
case joinKindRight:
return qm.RightOuterJoin(strings.Join(j.clauses, " AND "), args...)
}
return nil
}