Detailed examples of DB2 paging query and Java implementation

The blogger said: sometimes, we need to perform a lot of processing operations on the existing data in the database (for example, a field in the table needs to be updated). If we directly use select * from tablename, it is easy to cause problems. Therefore, we can choose paging query and batch data processing.

DB2

SQL statement 


As shown above, this is DB2's paging query statement.

Mapper

Java

So far, we have simulated the database mapping mapper XML file, Dao layer and service layer, and in mapper The SQL statement of paging query is written in XML. In particular, in the implementation layer of service, we implement specific paging query operations and process data in batches.

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