38 lines
808 B
Go
38 lines
808 B
Go
package sqlbuilder
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import "errors"
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type OrderByClause interface {
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serializeForOrderBy(statement statementType, out *queryData) error
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}
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type orderByClauseImpl struct {
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expression Expression
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ascent bool
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}
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func (o *orderByClauseImpl) serializeForOrderBy(statement statementType, out *queryData) error {
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if o.expression == nil {
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return errors.New("nil orderBy by clause.")
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}
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if err := o.expression.serializeForOrderBy(statement, out); 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 &orderByClauseImpl{expression: expression, ascent: true}
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}
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func DESC(expression Expression) OrderByClause {
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return &orderByClauseImpl{expression: expression, ascent: false}
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}
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