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49 lines
999 B
49 lines
999 B
package clause
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import "strconv"
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// Limit limit clause
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type Limit struct {
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Limit *int
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Offset int
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}
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// Name where clause name
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func (limit Limit) Name() string {
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return "LIMIT"
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}
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// Build build where clause
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func (limit Limit) Build(builder Builder) {
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if limit.Limit != nil && *limit.Limit >= 0 {
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builder.WriteString("LIMIT ")
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builder.WriteString(strconv.Itoa(*limit.Limit))
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}
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if limit.Offset > 0 {
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if limit.Limit != nil && *limit.Limit >= 0 {
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builder.WriteByte(' ')
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}
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builder.WriteString("OFFSET ")
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builder.WriteString(strconv.Itoa(limit.Offset))
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}
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}
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// MergeClause merge order by clauses
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func (limit Limit) MergeClause(clause *Clause) {
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clause.Name = ""
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if v, ok := clause.Expression.(Limit); ok {
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if (limit.Limit == nil || *limit.Limit == 0) && (v.Limit != nil && *v.Limit != 0) {
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limit.Limit = v.Limit
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}
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if limit.Offset == 0 && v.Offset > 0 {
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limit.Offset = v.Offset
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} else if limit.Offset < 0 {
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limit.Offset = 0
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}
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}
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clause.Expression = limit
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}
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