protected SortedMap<String, DataSource> lookupDataSourcesByRouter(
final String statementName, final Object parameterObject) {
SortedMap<String, DataSource> resultMap = new TreeMap<String, DataSource>();
String namespace = StringUtils.substringBeforeLast(statementName, ".");
String dsName = shardStrategy.getShardIdentitiesByNamespace(namespace, parameterObject);
if (dsName == null) {
throw new IllegalStateException("无法找到相应的分库资源，请检查参数列表中是否有传分库字段值, 参数:" + parameterObject);
}
resultMap.put(dsName, shardDataSourceService.getDataSources().get(dsName));
return resultMap;
}
