1. 什么是 "no_data_found" 异常? "no_data_found" 异常通常出现在数据库操作中,特别是当执行一个查询(如 SELECT 语句)时,如果查询没有返回任何数据行,而程序又期望至少有一行数据时,就会抛出此异常。这种异常是数据库访问层常见的运行时错误之一。 2. 可能导致 "no_data_found" 异常出现的情景 查询条件不...
在MySQL中处理no_data_found异常是非常重要的,它可以帮助我们更好地管理程序的异常情况,并保证程序的稳定性和可靠性。通过合理地编写异常处理代码,我们可以更好地应对no_data_found异常,提高程序的鲁棒性和可维护性。希望本文对您有所帮助!
Bulk collect当没有数据抛出异常跟implicit cursor 处理不一样。 先看一下implicit cursor的处理吧: cl scr;DECLAREl_descr hardware.descr%type;BEGINSELECTdescrINTOl_descrFROMhardwareWHEREaisle=0ANDitem=0; dbms_output.put_line('Item was found'); EXCEPTIONWHENno_data_foundTHENdbms_output.put_line('Inval...
2 (v_no emp.empno%type,v_comm out emp.comm%type) 3 as 4 begin 5 select comm into v_comm from emp where empno=v_no; 6 if v_comm is null then 7 raise_application_error(-20001,'It is no comm for this employee'); 8 end if; 9 exception 10 when no_data_found then 11 dbms_...
WHEN NO_DATA_FOUND THEN -- catches all ’no data found’ errors 2、异常的分类 有两种类型的异常,一种为内部异常,一种为用户自定义异常,内部异常是执行期间返回到PL/SQL块的ORACLE错误或由PL/SQL代码的某操作引起的错误,如除数为零或内存溢出的情况。用户自定义异常由开发者显示定义,在PL/SQL块中传递信息...
This code could throw the no_data_found error. You should avoid using "WHEN OTHERS", since you may not know exactly what caused the exception. CREATE or REPLACE FUNCTION GET_EMP_COUNT_JC450912 ( p_dept_name VARCHAR ) RETURN VARCHAR IS no_of_employees NUMBER; BEGIN SELECT department.dep...
CREATE OR REPLACE TRIGGER visitDeceased BEFORE INSERT ON Visit FOR EACH ROW DECLARE pd Patient.d_date%TYPE; BEGIN SELECT P.d_date INTO pd FROM Patient P JOIN Visit V ON P.idP=:NEW.id_PV; EXCEPTION WHEN NO_DATA_FOUND THEN INSERT INTO Visit(date_V,v_Hospital,id_PV) VALUES(:NEW.dat...
ORA-01403:no data found exception的解决小道 问题:在使用select into from tablename这样的隐式游标的时候,如果查不到数据,那么会报ora-01403的错误。而每次使用显式游标,再打开取值就显得很麻烦。一个经验丰富的老师提出可以用类似max min等这样的聚合函数,来避免select into带来的异常,又避免每次使用游标的麻烦...
oracle.kv.MetadataNotFoundException All Implemented Interfaces: Serializable, oracle.kv.impl.util.FastExternalizable public class MetadataNotFoundException extends FastExternalizableException The exception is thrown when an expected piece of metadata is not found. This probably indicates an inconsistency betwe...
When 'org.springframework.boot:spring-boot-starter-web' dependency is only added and run the following code: @EnableAutoConfiguration @ComponentScan public class Application { public static void main(String[] args) { SpringApplication.run(Application.class); } } Got the following exception: java....