48 lines
906 B
Go
48 lines
906 B
Go
package clause
|
|
|
|
type JoinType string
|
|
|
|
const (
|
|
CrossJoin JoinType = "CROSS"
|
|
InnerJoin JoinType = "INNER"
|
|
LeftJoin JoinType = "LEFT"
|
|
RightJoin JoinType = "RIGHT"
|
|
)
|
|
|
|
// Join join clause for from
|
|
type Join struct {
|
|
Type JoinType
|
|
Table Table
|
|
ON Where
|
|
Using []string
|
|
Expression Expression
|
|
}
|
|
|
|
func (join Join) Build(builder Builder) {
|
|
if join.Expression != nil {
|
|
join.Expression.Build(builder)
|
|
} else {
|
|
if join.Type != "" {
|
|
builder.WriteString(string(join.Type))
|
|
builder.WriteByte(' ')
|
|
}
|
|
|
|
builder.WriteString("JOIN ")
|
|
builder.WriteQuoted(join.Table)
|
|
|
|
if len(join.ON.Exprs) > 0 {
|
|
builder.WriteString(" ON ")
|
|
join.ON.Build(builder)
|
|
} else if len(join.Using) > 0 {
|
|
builder.WriteString(" USING (")
|
|
for idx, c := range join.Using {
|
|
if idx > 0 {
|
|
builder.WriteByte(',')
|
|
}
|
|
builder.WriteQuoted(c)
|
|
}
|
|
builder.WriteByte(')')
|
|
}
|
|
}
|
|
}
|