c44405a25b
* Implement Generics API * Add more generics tests * Add more tests and Take method * use delayed‑ops pipeline for generics API * fix generics tests for mysql * Support SubQuery for Generics * Add clause.JoinTable helper method * Fix golangci-lint error * Complete the design and implementation of generic version Join * improve generics version Joins support * allow configuring select/omit columns for joins via subqueries * finish generic version Preload * handle error of generics Joins/Preload * fix tests * Add LimitPerRecord for generic version Preload * fix tests for mysql 5.7 * test for nested generic version Join/Preload * Add WithResult support for generics API * test reuse generics db conditions * fix data race * remove ExampleLRU test * Add default transaction timeout support * fix test
80 lines
1.5 KiB
Go
80 lines
1.5 KiB
Go
package clause
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import "gorm.io/gorm/utils"
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type JoinType string
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const (
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CrossJoin JoinType = "CROSS"
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InnerJoin JoinType = "INNER"
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LeftJoin JoinType = "LEFT"
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RightJoin JoinType = "RIGHT"
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)
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type JoinTarget struct {
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Type JoinType
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Association string
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Subquery Expression
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Table string
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}
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func Has(name string) JoinTarget {
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return JoinTarget{Type: InnerJoin, Association: name}
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}
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func (jt JoinType) Association(name string) JoinTarget {
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return JoinTarget{Type: jt, Association: name}
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}
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func (jt JoinType) AssociationFrom(name string, subquery Expression) JoinTarget {
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return JoinTarget{Type: jt, Association: name, Subquery: subquery}
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}
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func (jt JoinTarget) As(name string) JoinTarget {
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jt.Table = name
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return jt
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}
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// Join clause for from
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type Join struct {
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Type JoinType
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Table Table
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ON Where
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Using []string
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Expression Expression
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}
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func JoinTable(names ...string) Table {
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return Table{
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Name: utils.JoinNestedRelationNames(names),
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}
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}
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func (join Join) Build(builder Builder) {
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if join.Expression != nil {
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join.Expression.Build(builder)
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} else {
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if join.Type != "" {
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builder.WriteString(string(join.Type))
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builder.WriteByte(' ')
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}
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builder.WriteString("JOIN ")
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builder.WriteQuoted(join.Table)
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if len(join.ON.Exprs) > 0 {
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builder.WriteString(" ON ")
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join.ON.Build(builder)
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} else if len(join.Using) > 0 {
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builder.WriteString(" USING (")
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for idx, c := range join.Using {
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if idx > 0 {
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builder.WriteByte(',')
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}
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builder.WriteQuoted(c)
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}
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builder.WriteByte(')')
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}
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}
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}
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