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package sqlschema
import (
"fmt"
"github.com/uptrace/bun"
"github.com/uptrace/bun/schema"
)
type MigratorDialect interface {
schema.Dialect
NewMigrator(db *bun.DB, schemaName string) Migrator
}
type Migrator interface {
AppendSQL(b []byte, operation interface{}) ([]byte, error)
}
// migrator is a dialect-agnostic wrapper for sqlschema.MigratorDialect.
type migrator struct {
Migrator
}
func NewMigrator(db *bun.DB, schemaName string) (Migrator, error) {
md, ok := db.Dialect().(MigratorDialect)
if !ok {
return nil, fmt.Errorf("%q dialect does not implement sqlschema.Migrator", db.Dialect().Name())
}
return &migrator{
Migrator: md.NewMigrator(db, schemaName),
}, nil
}
// BaseMigrator can be embeded by dialect's Migrator implementations to re-use some of the existing bun queries.
type BaseMigrator struct {
db *bun.DB
}
func NewBaseMigrator(db *bun.DB) *BaseMigrator {
return &BaseMigrator{db: db}
}
func (m *BaseMigrator) AppendCreateTable(b []byte, model interface{}) ([]byte, error) {
return m.db.NewCreateTable().Model(model).AppendQuery(m.db.Formatter(), b)
}
func (m *BaseMigrator) AppendDropTable(b []byte, schemaName, tableName string) ([]byte, error) {
return m.db.NewDropTable().TableExpr("?.?", bun.Ident(schemaName), bun.Ident(tableName)).AppendQuery(m.db.Formatter(), b)
}
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