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55 lines
1.1 KiB
55 lines
1.1 KiB
package clause
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type OrderByColumn struct {
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Column Column
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Desc bool
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Reorder bool
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}
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type OrderBy struct {
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Columns []OrderByColumn
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Expression Expression
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}
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// Name where clause name
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func (orderBy OrderBy) Name() string {
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return "ORDER BY"
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}
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// Build build where clause
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func (orderBy OrderBy) Build(builder Builder) {
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if orderBy.Expression != nil {
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orderBy.Expression.Build(builder)
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} else {
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for idx, column := range orderBy.Columns {
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if idx > 0 {
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builder.WriteByte(',')
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}
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builder.WriteQuoted(column.Column)
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if column.Desc {
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builder.WriteString(" DESC")
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}
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}
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}
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}
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// MergeClause merge order by clauses
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func (orderBy OrderBy) MergeClause(clause *Clause) {
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if v, ok := clause.Expression.(OrderBy); ok {
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for i := len(orderBy.Columns) - 1; i >= 0; i-- {
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if orderBy.Columns[i].Reorder {
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orderBy.Columns = orderBy.Columns[i:]
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clause.Expression = orderBy
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return
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}
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}
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copiedColumns := make([]OrderByColumn, len(v.Columns))
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copy(copiedColumns, v.Columns)
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orderBy.Columns = append(copiedColumns, orderBy.Columns...)
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}
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clause.Expression = orderBy
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}
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