从数据库读取批量数据（动态查询），并使用spring batch将其写入平面文件

Question

I want to read a bulk data from database, the query to read the tables will be dynamic (table name will be chosen from the config file). and wite the data in a flatfile with a delimiter. As the table name itself dynamic, I cant go with any rowmapper/DTO/VO classes.

Which is reading a custom data and writing it to the flat file with some delimiter.

Can you help to identify how we can achieve this with spring batch.

Answer 1

Write your custom reader implementing ItemStreamReader. Read the config file in the open() method and set the table name as a global variable. read() method you can write the query to fetch the record using the global variable.

Answer 2

使用写入Map的RowMapper并将Map用作返回的项目。