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You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ”’,”’ at line 1
报错原因:MySql语句中具有?,需要用PreparedStatement对象动态设置值,这时如果调用ResultSetMetaData metaData = pstm.getMetaData();就会产生以上错误;
如果SQL语句中没有?,调用ResultSetMetaData metaData = pstm.getMetaData();就不会报错。
注意:
1.返回单条数据时,以下两种均可用:
ResultSet resultSet = pstm.executeQuery();
ResultSetMetaData metaData = resultSet.getMetaData();// 用于获取列名,
或者:ResultSetMetaData metaData = pstm.getMetaData();// 用于获取列名,
2.若返回多条结果时:只能用如下操作:否则报以上错误
ResultSet resultSet = pstm.executeQuery();
ResultSetMetaData metaData = resultSet.getMetaData();// 用于获取列名,
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