我正在尝试配置 JdbcPagingItemReader bean，但我不确切知道表中列的名称，因此我想知道是否有一种方法可以在没有排序键的情况下配置 PagingQueryProvider。
@Bean
public JdbcPagingItemReader<Map<String, Object>> pagingItemReader(DataSource dataSource){
JdbcPagingItemReader<Map<String, Object>> itemReader = new JdbcPagingItemReader<>();
itemReader.setDataSource(dataSource);
itemReader.setQueryProvider(queryProvider());
itemReader.setPageSize(1000);
itemReader.setRowMapper(BatchConfiguration::rowMapper);
return itemReader;
}
/* This configuration throws the exception
* 'java.lang.IllegalArgumentException: sortKey must be specified'
*/
private MySqlPagingQueryProvider queryProvider(){
MySqlPagingQueryProvider queryProvider = new MySqlPagingQueryProvider();
queryProvider.setSelectClause("SELECT *");
queryProvider.setFromClause("FROM "+ clientTableName);
return queryProvider;
}
最佳答案
I'd like to know if there is a way to configure a PagingQueryProvider without a sort key.
不，这是不可能的。 sortKey 是构建 SQL 语句所必需的。以下是 reference documentation 的摘录:
The SqlPagingQueryProviderFactoryBean requires that you specify a select clause and a from clause. You can also provide an optional where clause. These clauses and the required sortKey are used to build an SQL statement.
关于java - Spring 批处理 : How to configure PagingQueryProvider without a SortKeys，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54442415/