Add SQLBuilder support for SQLite databases.

sqlite/select_statement.go

@@ -0,0 +1,186 @@
+package sqlite
+
+import (
+	"github.com/go-jet/jet/v2/internal/jet"
+)
+
+// RowLock is interface for SELECT statement row lock types
+type RowLock = jet.RowLock
+
+// Row lock types
+var (
+	UPDATE = jet.NewRowLock("UPDATE")
+	SHARE  = jet.NewRowLock("SHARE")
+)
+
+// Window function clauses
+var (
+	PARTITION_BY = jet.PARTITION_BY
+	ORDER_BY     = jet.ORDER_BY
+	UNBOUNDED    = jet.UNBOUNDED
+	CURRENT_ROW  = jet.CURRENT_ROW
+)
+
+// PRECEDING window frame clause
+func PRECEDING(offset interface{}) jet.FrameExtent {
+	return jet.PRECEDING(toJetFrameOffset(offset))
+}
+
+// FOLLOWING window frame clause
+func FOLLOWING(offset interface{}) jet.FrameExtent {
+	return jet.FOLLOWING(toJetFrameOffset(offset))
+}
+
+// Window is used to specify window reference from WINDOW clause
+var Window = jet.WindowName
+
+// SelectStatement is interface for MySQL SELECT statement
+type SelectStatement interface {
+	Statement
+	jet.HasProjections
+	Expression
+
+	DISTINCT() SelectStatement
+	FROM(tables ...ReadableTable) SelectStatement
+	WHERE(expression BoolExpression) SelectStatement
+	GROUP_BY(groupByClauses ...GroupByClause) SelectStatement
+	HAVING(boolExpression BoolExpression) SelectStatement
+	WINDOW(name string) windowExpand
+	ORDER_BY(orderByClauses ...OrderByClause) SelectStatement
+	LIMIT(limit int64) SelectStatement
+	OFFSET(offset int64) SelectStatement
+	FOR(lock RowLock) SelectStatement
+	LOCK_IN_SHARE_MODE() SelectStatement
+
+	UNION(rhs SelectStatement) setStatement
+	UNION_ALL(rhs SelectStatement) setStatement
+
+	AsTable(alias string) SelectTable
+}
+
+//SELECT creates new SelectStatement with list of projections
+func SELECT(projection Projection, projections ...Projection) SelectStatement {
+	return newSelectStatement(nil, append([]Projection{projection}, projections...))
+}
+
+func newSelectStatement(table ReadableTable, projections []Projection) SelectStatement {
+	newSelect := &selectStatementImpl{}
+	newSelect.ExpressionStatement = jet.NewExpressionStatementImpl(Dialect, jet.SelectStatementType, newSelect, &newSelect.Select,
+		&newSelect.From, &newSelect.Where, &newSelect.GroupBy, &newSelect.Having, &newSelect.Window, &newSelect.OrderBy,
+		&newSelect.Limit, &newSelect.Offset, &newSelect.For, &newSelect.ShareLock)
+
+	newSelect.Select.ProjectionList = projections
+	if table != nil {
+		newSelect.From.Tables = []jet.Serializer{table}
+	}
+	newSelect.Limit.Count = -1
+	newSelect.Offset.Count = -1
+	newSelect.ShareLock.Name = "LOCK IN SHARE MODE"
+	newSelect.ShareLock.InNewLine = true
+
+	newSelect.setOperatorsImpl.parent = newSelect
+
+	return newSelect
+}
+
+type selectStatementImpl struct {
+	jet.ExpressionStatement
+	setOperatorsImpl
+
+	Select    jet.ClauseSelect
+	From      jet.ClauseFrom
+	Where     jet.ClauseWhere
+	GroupBy   jet.ClauseGroupBy
+	Having    jet.ClauseHaving
+	Window    jet.ClauseWindow
+	OrderBy   jet.ClauseOrderBy
+	Limit     jet.ClauseLimit
+	Offset    jet.ClauseOffset
+	For       jet.ClauseFor
+	ShareLock jet.ClauseOptional
+}
+
+func (s *selectStatementImpl) DISTINCT() SelectStatement {
+	s.Select.Distinct = true
+	return s
+}
+
+func (s *selectStatementImpl) FROM(tables ...ReadableTable) SelectStatement {
+	s.From.Tables = nil
+	for _, table := range tables {
+		s.From.Tables = append(s.From.Tables, table)
+	}
+	return s
+}
+
+func (s *selectStatementImpl) WHERE(condition BoolExpression) SelectStatement {
+	s.Where.Condition = condition
+	return s
+}
+
+func (s *selectStatementImpl) GROUP_BY(groupByClauses ...GroupByClause) SelectStatement {
+	s.GroupBy.List = groupByClauses
+	return s
+}
+
+func (s *selectStatementImpl) HAVING(boolExpression BoolExpression) SelectStatement {
+	s.Having.Condition = boolExpression
+	return s
+}
+
+func (s *selectStatementImpl) WINDOW(name string) windowExpand {
+	s.Window.Definitions = append(s.Window.Definitions, jet.WindowDefinition{Name: name})
+	return windowExpand{selectStatement: s}
+}
+
+func (s *selectStatementImpl) ORDER_BY(orderByClauses ...OrderByClause) SelectStatement {
+	s.OrderBy.List = orderByClauses
+	return s
+}
+
+func (s *selectStatementImpl) LIMIT(limit int64) SelectStatement {
+	s.Limit.Count = limit
+	return s
+}
+
+func (s *selectStatementImpl) OFFSET(offset int64) SelectStatement {
+	s.Offset.Count = offset
+	return s
+}
+
+func (s *selectStatementImpl) FOR(lock RowLock) SelectStatement {
+	s.For.Lock = lock
+	return s
+}
+
+func (s *selectStatementImpl) LOCK_IN_SHARE_MODE() SelectStatement {
+	s.ShareLock.Show = true
+	return s
+}
+
+func (s *selectStatementImpl) AsTable(alias string) SelectTable {
+	return newSelectTable(s, alias)
+}
+
+//-----------------------------------------------------
+
+type windowExpand struct {
+	selectStatement *selectStatementImpl
+}
+
+func (w windowExpand) AS(window ...jet.Window) SelectStatement {
+	if len(window) == 0 {
+		return w.selectStatement
+	}
+	windowsDefinition := w.selectStatement.Window.Definitions
+	windowsDefinition[len(windowsDefinition)-1].Window = window[0]
+	return w.selectStatement
+}
+
+func toJetFrameOffset(offset interface{}) jet.Serializer {
+	if offset == UNBOUNDED {
+		return jet.UNBOUNDED
+	}
+
+	return jet.FixedLiteral(offset)
+}