forked from mirror/gorm
43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
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package gorm
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import (
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"fmt"
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"strings"
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)
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type JoinTableHandler interface {
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Add(*DB, *Relationship, interface{}, interface{}) error
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Delete(*DB, *Relationship) error
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Scope(*DB, *Relationship) *DB
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}
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type defaultJoinTableHandler struct{}
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func (*defaultJoinTableHandler) Add(db *DB, relationship *Relationship, foreignValue interface{}, associationValue interface{}) error {
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scope := db.NewScope("")
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quotedForeignDBName := scope.Quote(relationship.ForeignDBName)
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quotedAssociationDBName := scope.Quote(relationship.AssociationForeignDBName)
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sql := fmt.Sprintf(
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"INSERT INTO %v (%v) SELECT ?,? %v WHERE NOT EXISTS (SELECT * FROM %v WHERE %v = ? AND %v = ?);",
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scope.Quote(relationship.JoinTable),
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strings.Join([]string{quotedForeignDBName, quotedAssociationDBName}, ","),
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scope.Dialect().SelectFromDummyTable(),
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scope.Quote(relationship.JoinTable),
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quotedForeignDBName,
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quotedAssociationDBName,
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)
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return db.Exec(sql, foreignValue, associationValue, foreignValue, associationValue).Error
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}
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func (*defaultJoinTableHandler) Delete(db *DB, relationship *Relationship) error {
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return db.Delete("").Error
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}
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func (*defaultJoinTableHandler) Scope(db *DB, relationship *Relationship) *DB {
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return db
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}
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var DefaultJoinTableHandler = &defaultJoinTableHandler{}
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