地址:https://blog.csdn.net/u014635374/article/details/107311227
切记:引入MybatisPlus后,禁止引入Mybatis,避免没必要的冲突

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QueryWrapper<User> queryWrapper = new QueryWrapper<>();
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int delete = mapper.delete(queryWrapper);
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System.out.println("delete return count = " + delete);
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