调用 jdbcTemplate.queryForList 时出现错误 spring-org.springframework.jdbc.IncorrectResultSetColumnCountException
时间：2022-03-14 02:37
查找到解决方法： http://www.cnblogs.com/wumian/articles/2012-10-25-2056.html
调用spring jdbc接口：
User user = (User) this.jdbcTemplate.queryForObject(
"SELECT * FROM USER WHERE ID = 1", User.class);
|
报错如下:
Exception in thread "main" org.springframework.jdbc.IncorrectResultSetColumnCountException: Incorrect column count: expected 1, actual 4
at org.springframework.jdbc.core.SingleColumnRowMapper.mapRow(SingleColumnRowMapper.java:87)
at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:92)
at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:1)
at org.springframework.jdbc.core.JdbcTemplate$1QueryStatementCallback.doInStatement(JdbcTemplate.java:445)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:395)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:455)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:463)
at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:471)
at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:476)
at com.ylp.dao.UserDao.getById(UserDao.java:45)
at com.ylp.dao.Test.main(Test.java:17)
|
大概意思是：查出的数据有4列，它把jdbc.queryForObject("SELECT * FROM USER WHERE ID = 1", User.class);中的第一列转换成User.class，所以 expected 1, actual 6，预期1列，但查出来的数据有4列
修改:
RowMapper<User> rm = ParameterizedBeanPropertyRowMapper.newInstance(User.class);
User user = (User) this.jdbcTemplate.queryForObject(
"SELECT * FROM USER WHERE ID = 1", rm);
|
