forked from mirror/gorm
46 lines
859 B
Go
46 lines
859 B
Go
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package clause
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// Select select attrs when querying, updating, creating
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type Select struct {
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SelectColumns []Column
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OmitColumns []Column
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}
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// SelectInterface select clause interface
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type SelectInterface interface {
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Selects() []Column
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Omits() []Column
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}
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func (s Select) Selects() []Column {
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return s.SelectColumns
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}
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func (s Select) Omits() []Column {
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return s.OmitColumns
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}
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func (s Select) Build(builder Builder) {
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if len(s.SelectColumns) > 0 {
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for idx, column := range s.SelectColumns {
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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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} else {
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builder.WriteByte('*')
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}
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}
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func (s Select) MergeExpression(expr Expression) {
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if v, ok := expr.(SelectInterface); ok {
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if len(s.SelectColumns) == 0 {
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s.SelectColumns = v.Selects()
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}
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if len(s.OmitColumns) == 0 {
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s.OmitColumns = v.Omits()
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}
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}
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}
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