today for code development to meet the Type definition error: [simple Type, class oracle JDBC. OracleConnection]; Nested-exception is… After checking all the data, I finally found that it was caused by the wm_concat() function in Oracle. Wm_concat () will return different field types depending on the oracle version. Clob type will be returned in oracle11g and varchar type will be returned in oracle10g.
the solution is as follows:
select qlrid,to_char(wm_concat(qlr)) as qlr,to_char(wm_concat(qlrzjh)) as qlrzjh from qlr t group by qlrid;
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