tradeDate=rs2.getString("xxx"); } 执行到while(rs2.next()){ 的时候就报Exception in thread "main" java.sql.SQLException: Statement has already closed. 中间没有关闭Statement , 尝试修改代码顺序如下: ResultSet rs = stmt.executeQuery("select * from xxx"); int countWb =0; while (rs.next(...
Calling the method close on a Statement object that is already closed has no effect. Note:When a Statement object is closed, its current ResultSet object, if one exists, is also closed. Specified by: close in interface AutoCloseable Throws: SQLException - if a database access error occurs ...
以上这段代码在使用jdbc-1.4.jar或者ojdbc14.jar这两个包时是没有问题的,前者是独立的JDBC包,后者是Weblogic9.2使用的包。 但是,如果使用ojdbc6.jar这个包时,问题就会出现了,异常为SQLException: Result set already closed. 个人推测,Oracle在jdbc-1.4.jar这个版本的JDBC实现中,并未遵守JDBC规范,因为Java规范中明确...
"If a thread attempts to use the connection while another one is using it, it will wait until the other thread has finished its current operation. If the operation is a regular SQL statement, then the operation consists of sending the statement and retrieving any ResultSet (in full)." Ther...
If the pay statement has already been posted or submitted for payment, or if the payment has already been issued, you must reverse the pay statement instead of deleting it. For more information, see Work with existing payroll payments. When you delete a pay statement: The earnings statement ...
When reading the value of an out parameter you don't have to use thegetXXXmethod whose Java type XXX corresponds to the parameter's registered SQL type. It's just faster if you do as the data has already been converted to the right type. ...
Project already has a reference to assembly <assemblyidentity> Project has been closed Project-level conditional compilation constant '<constantname>' is not valid: <error> Project-level conditional compilation constant is not valid: <error> Properties cannot be declared '<modifiername>' Prop...
When we have network issues it seems like the pool is not managing the validation or abandoned connections properly because after some time requests start failing with these traces: Raw Caused by: java.sql.SQLException: Connection has already been closed. ...
You can also use theusingstatement and declaration with an instance of aref structthat fits the disposable pattern. That is, it has an instanceDisposemethod, which is accessible, parameterless and has avoidreturn type. Theusingstatement can also be of the following form: ...
Because each physical connection has its own cache, multiple caches can exist if you enable Statement caching for multiple physical connections. When you enable Statement caching on a connection cache, the logical connections benefit from the Statement caching that is enabled on the underlying physical...