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[MySQL] Optimizer hints

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go-jet 2022-09-29 13:33:00 +02:00
parent c9967d151e
commit f772f90336
12 changed files with 207 additions and 27 deletions
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52
internal/jet/clause.go
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@ -16,11 +16,35 @@ type ClauseWithProjections interface {
Projections() ProjectionList
}
// OptimizerHint provides a way to optimize query execution per-statement basis
type OptimizerHint string
type optimizerHints []OptimizerHint
func (o optimizerHints) Serialize(statementType StatementType, out *SQLBuilder, options ...SerializeOption) {
if len(o) == 0 {
return
}
out.WriteString("/*+")
for i, hint := range o {
if i > 0 {
out.WriteByte(' ')
}
out.WriteString(string(hint))
}
out.WriteString("*/")
}
// ClauseSelect struct
type ClauseSelect struct {
Distinct bool
DistinctOnColumns []ColumnExpression
ProjectionList []Projection
// MySQL only
OptimizerHints optimizerHints
}
// Projections returns list of projections for select clause
@ -32,6 +56,7 @@ func (s *ClauseSelect) Projections() ProjectionList {
func (s *ClauseSelect) Serialize(statementType StatementType, out *SQLBuilder, options ...SerializeOption) {
out.NewLine()
out.WriteString("SELECT")
s.OptimizerHints.Serialize(statementType, out, options...)
if s.Distinct {
out.WriteString("DISTINCT")
@ -286,12 +311,16 @@ func (s *ClauseSetStmtOperator) Serialize(statementType StatementType, out *SQLB
// ClauseUpdate struct
type ClauseUpdate struct {
Table SerializerTable
// MySQL only
OptimizerHints optimizerHints
}
// Serialize serializes clause into SQLBuilder
func (u *ClauseUpdate) Serialize(statementType StatementType, out *SQLBuilder, options ...SerializeOption) {
out.NewLine()
out.WriteString("UPDATE")
u.OptimizerHints.Serialize(statementType, out, options...)
if utils.IsNil(u.Table) {
panic("jet: table to update is nil")
@ -342,6 +371,9 @@ func (s *SetClause) Serialize(statementType StatementType, out *SQLBuilder, opti
type ClauseInsert struct {
Table SerializerTable
Columns []Column
// MySQL only
OptimizerHints optimizerHints
}
// GetColumns gets list of columns for insert
@ -355,13 +387,15 @@ func (i *ClauseInsert) GetColumns() []Column {
// Serialize serializes clause into SQLBuilder
func (i *ClauseInsert) Serialize(statementType StatementType, out *SQLBuilder, options ...SerializeOption) {
out.NewLine()
out.WriteString("INSERT INTO")
if utils.IsNil(i.Table) {
panic("jet: table is nil for INSERT clause")
}
out.NewLine()
out.WriteString("INSERT")
i.OptimizerHints.Serialize(statementType, out, options...)
out.WriteString("INTO")
i.Table.serialize(statementType, out)
if len(i.Columns) > 0 {
@ -449,17 +483,17 @@ func (v *ClauseQuery) Serialize(statementType StatementType, out *SQLBuilder, op
// ClauseDelete struct
type ClauseDelete struct {
Table SerializerTable
// MySQL only
OptimizerHints optimizerHints
}
// Serialize serializes clause into SQLBuilder
func (d *ClauseDelete) Serialize(statementType StatementType, out *SQLBuilder, options ...SerializeOption) {
out.NewLine()
out.WriteString("DELETE FROM")
if d.Table == nil {
panic("jet: nil table in DELETE clause")
}
out.WriteString("DELETE")
d.OptimizerHints.Serialize(statementType, out, options...)
out.WriteString("FROM")
d.Table.serialize(statementType, out, FallTrough(options)...)
}