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Extend set operator to accept sets as parameters.

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This commit is contained in:
zer0sub 2019-05-13 11:48:58 +02:00
parent 240ddd65e6
commit 1fd63b8783
4 changed files with 57 additions and 8 deletions
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18
sqlbuilder/set_statement.go
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@ -15,6 +15,7 @@ const (
type setStatement interface {
Statement
expression
hasRows()
ORDER_BY(clauses ...orderByClause) setStatement
LIMIT(limit int64) setStatement
@ -23,43 +24,44 @@ type setStatement interface {
AsTable(alias string) expressionTable
}
func UNION(selects ...selectStatement) setStatement {
func UNION(selects ...rowsType) setStatement {
return newSetStatementImpl(union, false, selects...)
}
func UNION_ALL(selects ...selectStatement) setStatement {
func UNION_ALL(selects ...rowsType) setStatement {
return newSetStatementImpl(union, true, selects...)
}
func INTERSECT(selects ...selectStatement) setStatement {
func INTERSECT(selects ...rowsType) setStatement {
return newSetStatementImpl(intersect, false, selects...)
}
func INTERSECT_ALL(selects ...selectStatement) setStatement {
func INTERSECT_ALL(selects ...rowsType) setStatement {
return newSetStatementImpl(intersect, true, selects...)
}
func EXCEPT(selects ...selectStatement) setStatement {
func EXCEPT(selects ...rowsType) setStatement {
return newSetStatementImpl(except, false, selects...)
}
func EXCEPT_ALL(selects ...selectStatement) setStatement {
func EXCEPT_ALL(selects ...rowsType) setStatement {
return newSetStatementImpl(except, true, selects...)
}
// Similar to selectStatementImpl, but less complete
type setStatementImpl struct {
expressionInterfaceImpl
isRowsType
operator string
selects []selectStatement
selects []rowsType
orderBy []orderByClause
limit, offset int64
// True if results of the union should be deduped.
all bool
}
func newSetStatementImpl(operator string, all bool, selects ...selectStatement) setStatement {
func newSetStatementImpl(operator string, all bool, selects ...rowsType) setStatement {
setStatement := &setStatementImpl{
operator: operator,
selects: selects,