55 lines
1 KiB
Go
55 lines
1 KiB
Go
package sqlbuilder
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import "github.com/dropbox/godropbox/errors"
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type OrderByClause interface {
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Clause
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isOrderByClauseType()
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}
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type isOrderByClause struct {
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}
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func (o *isOrderByClause) isOrderByClauseType() {
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}
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type ColumnNameOrderBy string
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func (o *ColumnNameOrderBy) isOrderByClauseType() {
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}
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func (o *ColumnNameOrderBy) Serialize(out *queryData, options ...serializeOption) error {
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return nil
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}
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type orderByClause struct {
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isOrderByClause
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expression Expression
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ascent bool
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}
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func (o *orderByClause) Serialize(out *queryData, options ...serializeOption) error {
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if o.expression == nil {
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return errors.Newf("nil orderBy by clause.")
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}
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if err := o.expression.Serialize(out, UNION_ORDER_BY); err != nil {
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return err
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}
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if o.ascent {
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out.WriteString(" ASC")
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} else {
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out.WriteString(" DESC")
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}
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return nil
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}
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func Asc(expression Expression) OrderByClause {
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return &orderByClause{expression: expression, ascent: true}
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}
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func Desc(expression Expression) OrderByClause {
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return &orderByClause{expression: expression, ascent: false}
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}
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