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Handle unsupported set operators for MySQL.

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go-jet 2019-08-08 11:44:19 +02:00
parent 4c5584aaae
commit 7930fb23ba
4 changed files with 133 additions and 13 deletions
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22
internal/jet/set_statement.go
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@ -7,37 +7,37 @@ import (
// UNION effectively appends the result of sub-queries(select statements) into single query.
// It eliminates duplicate rows from its result.
func UNION(lhs, rhs SelectStatement, selects ...SelectStatement) SelectStatement {
return newSetStatementImpl(union, false, toSelectList(lhs, rhs, selects...))
return newSetStatementImpl(Union, false, toSelectList(lhs, rhs, selects...))
}
// UNION_ALL effectively appends the result of sub-queries(select statements) into single query.
// It does not eliminates duplicate rows from its result.
func UNION_ALL(lhs, rhs SelectStatement, selects ...SelectStatement) SelectStatement {
return newSetStatementImpl(union, true, toSelectList(lhs, rhs, selects...))
return newSetStatementImpl(Union, true, toSelectList(lhs, rhs, selects...))
}
// INTERSECT returns all rows that are in query results.
// It eliminates duplicate rows from its result.
func INTERSECT(lhs, rhs SelectStatement, selects ...SelectStatement) SelectStatement {
return newSetStatementImpl(intersect, false, toSelectList(lhs, rhs, selects...))
return newSetStatementImpl(Intersect, false, toSelectList(lhs, rhs, selects...))
}
// INTERSECT_ALL returns all rows that are in query results.
// It does not eliminates duplicate rows from its result.
func INTERSECT_ALL(lhs, rhs SelectStatement, selects ...SelectStatement) SelectStatement {
return newSetStatementImpl(intersect, true, toSelectList(lhs, rhs, selects...))
return newSetStatementImpl(Intersect, true, toSelectList(lhs, rhs, selects...))
}
// EXCEPT returns all rows that are in the result of query lhs but not in the result of query rhs.
// It eliminates duplicate rows from its result.
func EXCEPT(lhs, rhs SelectStatement) SelectStatement {
return newSetStatementImpl(except, false, toSelectList(lhs, rhs))
return newSetStatementImpl(Except, false, toSelectList(lhs, rhs))
}
// EXCEPT_ALL returns all rows that are in the result of query lhs but not in the result of query rhs.
// It does not eliminates duplicate rows from its result.
func EXCEPT_ALL(lhs, rhs SelectStatement) SelectStatement {
return newSetStatementImpl(except, true, toSelectList(lhs, rhs))
return newSetStatementImpl(Except, true, toSelectList(lhs, rhs))
}
func toSelectList(lhs, rhs SelectStatement, selects ...SelectStatement) []SelectStatement {
@ -45,9 +45,9 @@ func toSelectList(lhs, rhs SelectStatement, selects ...SelectStatement) []Select
}
const (
union = "UNION"
intersect = "INTERSECT"
except = "EXCEPT"
Union = "UNION"
Intersect = "INTERSECT"
Except = "EXCEPT"
)
// Similar to selectStatementImpl, but less complete
@ -125,6 +125,10 @@ func (s *setStatementImpl) serializeImpl(out *SqlBuilder) error {
return errors.New("jet: UNION Statement must have at least two SELECT statements")
}
if setOverride := out.Dialect.SerializeOverride(s.operator); setOverride != nil {
return setOverride()(SelectStatementType, out)
}
out.newLine()
out.WriteString("(")
out.increaseIdent()