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