1、先将数据库中该字段全部转为大写,然后用Upper()函数将条件转为大写:select * from code_table_data t where Upper(t.DETAIL_DESC)=Upper('tr');2、 模糊查询:在Java中将条件转为大写,然后将该变量放入百分号(%)之间!select * from code_table_data t where Upper(t.DETAIL_DESC) like '%T%';