/
group.go
52 lines (48 loc) · 1.19 KB
/
group.go
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package specifications
import (
"github.com/aacfactory/errors"
"github.com/aacfactory/fns-contrib/databases/sql/dac/groups"
"github.com/valyala/bytebufferpool"
"io"
)
type GroupBy struct {
groups.GroupBy
}
func (group GroupBy) Exist() bool {
return len(group.Bys) > 0
}
func (group GroupBy) Render(ctx Context, w io.Writer) (argument []any, err error) {
buf := bytebufferpool.Get()
defer bytebufferpool.Put(buf)
_, _ = buf.Write(GROUP)
_, _ = buf.Write(SPACE)
_, _ = buf.Write(BY)
_, _ = buf.Write(SPACE)
for i, field := range group.Bys {
if i > 0 {
_, _ = buf.Write(COMMA)
}
content, localed := ctx.Localization(field)
if !localed {
err = errors.Warning("sql: group by render failed").WithMeta("field", field)
return
}
_, _ = buf.WriteString(content[0])
}
if group.Havings.Exist() {
_, _ = buf.Write(SPACE)
_, _ = buf.Write(HAVING)
_, _ = buf.Write(SPACE)
argument, err = Condition{group.Havings}.Render(ctx, buf)
if err != nil {
err = errors.Warning("sql: group by render failed").WithCause(err)
return
}
}
_, err = w.Write([]byte(buf.String()))
if err != nil {
err = errors.Warning("sql: group by render failed").WithCause(err)
return
}
return
}