forked from ulule/loukoum
/
groupby.go
40 lines (34 loc) · 796 Bytes
/
groupby.go
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package stmt
import (
"github.com/DzananGanic/loukoum/token"
"github.com/DzananGanic/loukoum/types"
)
// GroupBy is a GROUP BY clause.
type GroupBy struct {
Columns []Column
}
// NewGroupBy returns a new GroupBy instance.
func NewGroupBy(columns []Column) GroupBy {
return GroupBy{
Columns: columns,
}
}
// Write exposes statement as a SQL query.
func (group GroupBy) Write(ctx types.Context) {
ctx.Write(token.Group.String())
ctx.Write(" ")
ctx.Write(token.By.String())
ctx.Write(" ")
for i := range group.Columns {
if i != 0 {
ctx.Write(", ")
}
group.Columns[i].Write(ctx)
}
}
// IsEmpty returns true if statement is undefined.
func (group GroupBy) IsEmpty() bool {
return len(group.Columns) == 0
}
// Ensure that GroupBy is a Statement
var _ Statement = GroupBy{}