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join_table.go
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join_table.go
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package sq
import "strings"
// JoinType represents the various types of SQL joins.
type JoinType string
// JoinTypes
const (
JoinTypeInner JoinType = "JOIN"
JoinTypeLeft JoinType = "LEFT JOIN"
JoinTypeRight JoinType = "RIGHT JOIN"
JoinTypeFull JoinType = "FULL JOIN"
)
// JoinTable represents an SQL join.
type JoinTable struct {
JoinType JoinType
Table Table
OnPredicates VariadicPredicate
}
// Join creates a new inner join.
func Join(table Table, predicates ...Predicate) JoinTable {
return JoinTable{
JoinType: JoinTypeInner,
Table: table,
OnPredicates: VariadicPredicate{
Predicates: predicates,
},
}
}
// LeftJoin creates a new left join.
func LeftJoin(table Table, predicates ...Predicate) JoinTable {
return JoinTable{
JoinType: JoinTypeLeft,
Table: table,
OnPredicates: VariadicPredicate{
Predicates: predicates,
},
}
}
// RightJoin creates a new right join.
func RightJoin(table Table, predicates ...Predicate) JoinTable {
return JoinTable{
JoinType: JoinTypeRight,
Table: table,
OnPredicates: VariadicPredicate{
Predicates: predicates,
},
}
}
// FullJoin creates a new full join.
func FullJoin(table Table, predicates ...Predicate) JoinTable {
return JoinTable{
JoinType: JoinTypeFull,
Table: table,
OnPredicates: VariadicPredicate{
Predicates: predicates,
},
}
}
// CustomJoin creates a custom join. The join type can be specified with a
// string, e.g. "CROSS JOIN".
func CustomJoin(joinType JoinType, table Table, predicates ...Predicate) JoinTable {
return JoinTable{
JoinType: joinType,
Table: table,
OnPredicates: VariadicPredicate{
Predicates: predicates,
},
}
}
// AppendSQL marshals the JoinTable into a buffer and an args slice.
func (join JoinTable) AppendSQL(buf *strings.Builder, args *[]interface{}, params map[string]int) {
if join.JoinType == "" {
join.JoinType = JoinTypeInner
}
buf.WriteString(string(join.JoinType) + " ")
switch v := join.Table.(type) {
case nil:
buf.WriteString("NULL")
case Query:
buf.WriteString("(")
v.NestThis().AppendSQL(buf, args, nil)
buf.WriteString(")")
default:
join.Table.AppendSQL(buf, args, nil)
}
if join.Table != nil {
alias := join.Table.GetAlias()
if alias != "" {
buf.WriteString(" AS ")
buf.WriteString(alias)
}
}
if len(join.OnPredicates.Predicates) > 0 {
buf.WriteString(" ON ")
join.OnPredicates.toplevel = true
join.OnPredicates.AppendSQLExclude(buf, args, nil, nil)
}
}
// JoinTables is a list of JoinTables.
type JoinTables []JoinTable
// AppendSQL marshals the JoinTables into a buffer and an args slice.
func (joins JoinTables) AppendSQL(buf *strings.Builder, args *[]interface{}, params map[string]int) {
for i, join := range joins {
if i > 0 {
buf.WriteString(" ")
}
join.AppendSQL(buf, args, nil)
}
}