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Additional documentation.

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This commit is contained in:
go-jet 2019-07-18 17:43:11 +02:00
parent d253a35161
commit b10270b502
48 changed files with 892 additions and 699 deletions
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30
set_statement.go
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@ -4,28 +4,40 @@ import (
"errors"
)
// 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...))
}
// 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...))
}
// 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...))
}
// 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...))
}
func EXCEPT(lhs, rhs SelectStatement, selects ...SelectStatement) SelectStatement {
return newSetStatementImpl(except, false, 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))
}
func EXCEPT_ALL(lhs, rhs SelectStatement, selects ...SelectStatement) SelectStatement {
return newSetStatementImpl(except, true, toSelectList(lhs, rhs, selects...))
// 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))
}
func toSelectList(lhs, rhs SelectStatement, selects ...SelectStatement) []SelectStatement {
@ -102,7 +114,7 @@ func (s *setStatementImpl) serializeImpl(out *sqlBuilder) error {
}
if len(s.selects) < 2 {
return errors.New("jet: UNION Statement must have at least two SELECT statements.")
return errors.New("jet: UNION Statement must have at least two SELECT statements")
}
out.newLine()
@ -124,7 +136,7 @@ func (s *setStatementImpl) serializeImpl(out *sqlBuilder) error {
return errors.New("jet: select statement is nil")
}
err := selectStmt.serialize(set_statement, out)
err := selectStmt.serialize(setStatement, out)
if err != nil {
return err
@ -136,7 +148,7 @@ func (s *setStatementImpl) serializeImpl(out *sqlBuilder) error {
out.writeString(")")
if s.orderBy != nil {
err := out.writeOrderBy(set_statement, s.orderBy)
err := out.writeOrderBy(setStatement, s.orderBy)
if err != nil {
return err
}
@ -145,13 +157,13 @@ func (s *setStatementImpl) serializeImpl(out *sqlBuilder) error {
if s.limit >= 0 {
out.newLine()
out.writeString("LIMIT")
out.insertPreparedArgument(s.limit)
out.insertParametrizedArgument(s.limit)
}
if s.offset >= 0 {
out.newLine()
out.writeString("OFFSET")
out.insertPreparedArgument(s.offset)
out.insertParametrizedArgument(s.offset)
}
return nil