public class DefaultDataSourceManager extends DataSourceManager {
private DataSource dataSource;
Map<String,DataSourceDialect> dialects = new HashMap<>();
//通过MysqlDataSource的第二个参数为`true`来表示生成的API信息所存储的库，有且仅有一个为true
dialects.put("mysql",new MySQLDataSource(dataSource,true));
super.setDialectMap(dialects);