java.sql.SQLException: Illegal operation on empty result set 异常通常在尝试从空的 ResultSet 中提取数据时触发。以下是对该异常发生原因的分析、解决步骤以及一个示例代码修正: 1. 确认异常发生原因 该异常表明,你的代码试图在一个没有数据的结果集(ResultSet)上执行操作,如调用 getString()、getInt() 等方法...
1java.sql.SQLException: Illegal operation on empty result set.import java.sql.Connection;import java.sql.ResultSet;import java.sql.Statement;public class shujuku { public static void main(String args[]) { Connection conn; conn = Conn.getCon(); try{ Statement stmt = conn.createStatement(); Re...
报错信息:Java.sql.SQLException: Illegal operation on empty result set. 报错原因:查询的结果集 ResultSet 是空的,通常是数据库里没有对应的数据或者没有数据导致的,然后你又用了 rs.getString("")或者rs==null 或者 rs.equals("")来判断ResultSet 是否为空,所以就报这个错误了 解决办法:通过 rs.next() ...
empty result ：查询的结果为空 直译：非法操作空的结果集
Java.sql.SQLException: Illegal operation on empty result set. 报错信息:Java.sql.SQLException: Illegal operation on empty result set.报错原因:查询的结果集 ResultSet 是空的,通常是数据库里没有对应的数据或者没有数据导致的,然后你又用了 rs.getString("")或者rs==null 或者 rs.equals("")来判断Resu...
Inserts the specified element at the end of this deque if it is possible to do so immediately without violating capacity restrictions, throwing an IllegalStateException if no space is currently available. Clear() Removes all of the elements from this collection (optional operation). (Inherited fr...
attempting an operation on an ineligible key or value whose completion would not result in the insertion of an ineligible element into the map may throw an exception or it may succeed, at the option of the implementation. Such exceptions are marked as "optional" in the specification for this ...
这里操作 A 的执行结果不需要对操作 B 可见;而且重排序操作 A 和操作 B 后的执行结果,与操作 A 和操作 B 按 happens- before 顺序执行的结果一致。在这种情况下,JMM 会认为这种重排序并不非法(not illegal),JMM 允许这种重排序。 在计算机中,软件技术和硬件技术有一个共同的目标:在不改变程序执行结果的前提...
The Java SE 7 Advanced Platform, available for Java SE Suite, Java SE Advanced, and Java SE Support customers, is based on the current Java SE 7 release. For more information on installation and licensing of Java SE Suite and Java SE Advanced, visit Java SE Products Overview. See the fol...
Note that the-XX:InitalHeapSizeoption can also be used to set the initial heap size. If it appears after-Xmson the command line, then the initial heap size gets set to the value specified with-XX:InitalHeapSize. -Xmxsize Specifies the maximum size (in bytes) of the heap. This value ...