Type mismatch:时间:2023-03-10 07:25:29 Type mismatch: cannot convert from java.sql.PreparedStatement to com.mysql.jdbc.PreparedStatement import java.sql.PreparedStatement; java连接数据库的问题:Type mismatch: cannot convert from ResultSet to ResultSet 包导入错了,你要导入的是import java.sql.ResultSet;