35 lines
978 B
Go
35 lines
978 B
Go
package schema
|
|
|
|
const nilVersion = -1
|
|
|
|
// migrationState is meant to be populated by the generated migration code and
|
|
// contains the internal representation of a schema in the current binary.
|
|
type migrationState struct {
|
|
// binarySchemaVersion provides the database schema version supported by
|
|
// this binary.
|
|
binarySchemaVersion int
|
|
|
|
upMigrations map[int][]byte
|
|
}
|
|
|
|
// migrationStates is populated by the generated migration code with the key being the dialect.
|
|
var migrationStates = make(map[string]migrationState)
|
|
|
|
func getUpMigration(dialect string) map[int][]byte {
|
|
ms, ok := migrationStates[dialect]
|
|
if !ok {
|
|
return nil
|
|
}
|
|
return ms.upMigrations
|
|
}
|
|
|
|
// BinarySchemaVersion provides the schema version that this binary supports for the provided dialect.
|
|
// If the binary doesn't support this dialect -1 is returned.
|
|
func BinarySchemaVersion(dialect string) int {
|
|
ms, ok := migrationStates[dialect]
|
|
if !ok {
|
|
return nilVersion
|
|
}
|
|
return ms.binarySchemaVersion
|
|
}
|