Support non-PostgreSQL databases

query.go

@@ -0,0 +1,35 @@
+package migrate
+
+import "database/sql"
+
+func createSchemaIfNotExists(tx *sql.Tx, schema string) error {
+	row := tx.QueryRow(`SELECT 1 FROM information_schema.schemata WHERE schema_name = '` + schema + `'`)
+	err := row.Scan(new(int))
+	if err == sql.ErrNoRows {
+		_, err = tx.Exec(`CREATE SCHEMA ` + schema)
+		if err != nil {
+			return err
+		}
+	}
+	return err
+}
+
+func createTableIfNotExists(tx *sql.Tx, schema, table string) (string, error) {
+	versionTable := table
+	var schemaCond string
+
+	if schema != `` {
+		versionTable = schema + `.` + table
+		schemaCond = ` AND table_schema = '` + schema + `'`
+	}
+
+	row := tx.QueryRow(`SELECT 1 FROM information_schema.tables WHERE table_name = '` + table + `'` + schemaCond)
+	err := row.Scan(new(int))
+	if err == sql.ErrNoRows {
+		_, err = tx.Exec(`CREATE TABLE ` + versionTable + ` (version integer NOT NULL PRIMARY KEY)`)
+		if err != nil {
+			return ``, err
+		}
+	}
+	return versionTable, err
+}