Add disable option to avoid creating migration table on getting db map

migrate.go

@@ -37,6 +37,8 @@ type MigrationSet struct {
 	//
 	// This should be used sparingly as it is removing a safety check.
 	IgnoreUnknown bool
+	// DisableCreateTable disable the creation of the migration table
+	DisableCreateTable bool
 }
 
 var migSet = MigrationSet{}
@@ -106,6 +108,11 @@ func SetSchema(name string) {
 	}
 }
 
+// SetDisableCreateTable sets the boolean to disable the creation of the migration table
+func SetDisableCreateTable(disable bool) {
+	migSet.DisableCreateTable = disable
+}
+
 // SetIgnoreUnknown sets the flag that skips database check to see if there is a
 // migration in the database that is not in migration source.
 //
@@ -752,6 +759,10 @@ Check https://github.com/go-sql-driver/mysql#parsetime for more info.`)
 		table.ColMap("Id").SetMaxSize(4000)
 	}
 
+	if migSet.DisableCreateTable {
+		return dbMap, nil
+	}
+
 	err := dbMap.CreateTablesIfNotExists()
 	if err != nil {
 		// Oracle database does not support `if not exists`, so use `ORA-00955:` error code

migrate_test.go

@@ -648,3 +648,20 @@ func (s *SqliteMigrateSuite) TestRunMigrationObjOtherTable(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(n, Equals, 0)
 }
+
+func (s *SqliteMigrateSuite) TestSetDisableCreateTable(c *C) {
+	c.Assert(migSet.DisableCreateTable, Equals, false)
+
+	SetDisableCreateTable(true)
+	c.Assert(migSet.DisableCreateTable, Equals, true)
+
+	SetDisableCreateTable(false)
+	c.Assert(migSet.DisableCreateTable, Equals, false)
+}
+
+func (s *SqliteMigrateSuite) TestGetMigrationDbMapWithDisableCreateTable(c *C) {
+	SetDisableCreateTable(false)
+
+	_, err := migSet.getMigrationDbMap(s.Db, "postgres")
+	c.Assert(err, IsNil)
+}