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48 lines
1.0 KiB
48 lines
1.0 KiB
package clause |
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// GroupBy group by clause |
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type GroupBy struct { |
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Columns []Column |
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Having []Expression |
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} |
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// Name from clause name |
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func (groupBy GroupBy) Name() string { |
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return "GROUP BY" |
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} |
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// Build build group by clause |
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func (groupBy GroupBy) Build(builder Builder) { |
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for idx, column := range groupBy.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) |
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} |
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if len(groupBy.Having) > 0 { |
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builder.WriteString(" HAVING ") |
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Where{Exprs: groupBy.Having}.Build(builder) |
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} |
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} |
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// MergeClause merge group by clause |
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func (groupBy GroupBy) MergeClause(clause *Clause) { |
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if v, ok := clause.Expression.(GroupBy); ok { |
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copiedColumns := make([]Column, len(v.Columns)) |
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copy(copiedColumns, v.Columns) |
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groupBy.Columns = append(copiedColumns, groupBy.Columns...) |
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copiedHaving := make([]Expression, len(v.Having)) |
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copy(copiedHaving, v.Having) |
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groupBy.Having = append(copiedHaving, groupBy.Having...) |
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} |
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clause.Expression = groupBy |
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if len(groupBy.Columns) == 0 { |
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clause.Name = "" |
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} else { |
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clause.Name = groupBy.Name() |
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} |
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}
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