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46 lines
794 B
Go
46 lines
794 B
Go
package clause
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// Select select attrs when querying, updating, creating
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type Select struct {
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Distinct bool
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Columns []Column
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Expression Expression
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}
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func (s Select) Name() string {
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return "SELECT"
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}
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func (s Select) Build(builder Builder) {
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if len(s.Columns) > 0 {
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if s.Distinct {
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builder.WriteString("DISTINCT ")
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}
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for idx, column := range s.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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} else {
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builder.WriteByte('*')
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}
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}
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func (s Select) MergeClause(clause *Clause) {
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if s.Expression != nil {
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if s.Distinct {
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if expr, ok := s.Expression.(Expr); ok {
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expr.SQL = "DISTINCT " + expr.SQL
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clause.Expression = expr
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return
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}
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}
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clause.Expression = s.Expression
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} else {
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clause.Expression = s
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}
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}
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