declare continue handler for sqlstate '02000'达梦写法 在达梦数据库中,你可以使用以下语法来声明一个处理程序来处理特定的 SQL 状态码: sql复制代码 DECLARE HANDLER FOR SQLSTATE '02000' BEGIN -- 处理 SQL 状态码 '02000' 的逻辑 END; 上述代码中,SQLSTATE '02000'是要处理的 SQL 状态码。你可以在处理...
02000 主要代表的意思可以理解为：发生下述异常之一：SELECT INTO 语句或 INSERT 语句的子查询的结果为空表。在搜索的 UPDATE 或 DELETE 语句内标识的行数为零。在 FETCH 语句中引用的游标位置处于结果表最后一行之后。就是说你定义了，当fetch游标到了数据库表格最后一行的时候，设置done=1....
declareallNamevarchar(255)default''; declarecur1CURSORFORSELECTnameFROMtest.level; declareCONTINUEHANDLERFORSQLSTATE'02000'SETtmpname =null; #也可以这么写 #DECLARECONTINUEHANDLERFORNOTFOUNDSETtmpname =null; OPENcur1; FETCHcur1INTOtmpName; WHILE ( tmpnameisnotnull) DO settmpName = CONCAT(tmpName ...
DECLARE lista_leghe CURSOR FOR SELECT admin_lega, giornate, playoff, teams, sostituzioni, modulo, difesa, centrocampo, attacco, min_punti, diff_punti, attiva_cap, bonus_cap FROM settings; DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET leghe = 1; #--- #--- Scorrimento leghe --- ...
declare CONTINUE HANDLER FOR SQLSTATE '02000' SET tmpname = null; #也可以这么写 #DECLARE CONTINUE HANDLER FOR NOT FOUND SET tmpname = null; OPEN cur1; FETCH cur1 INTO tmpName; WHILE ( tmpname is not null) DO set tmpName = CONCAT(tmpName ,";") ; set allName = CONCAT(allName ,...
BEGIN /*局部变量的定义*/ declaretmpNamevarchar(20)default''; declareallNamevarchar(255)default''; declarecur1CURSORFORSELECTnameFROMtest.level; declareCONTINUEHANDLERFORSQLSTATE'02000'SETtmpname=null; #也可以这么写 #DECLARE CONTINUE HANDLER FOR NOT FOUNDSETtmpname=null; ...
declare continue handler for sqlstate '02000' set done = 1; 1. 20.查看表的属性结构 <1>.desc ; <2>.show columns from <1>.desc ; <2>.show columns from 24.删除表的某个字段 alter table drop column ; 1. 2. 3. 4. 5. alter table drop column ;25.当表中的字段名和MySQL的关键字...
DECLARE CONTINUE HANDLER FOR SQLWARNING BEGIN -- body of handler END; 1. ● NOT FOUND:以'02'开头的SQLSTATE值的缩写。这在游标上下文中是相关的,用于控制游标到达数据集末尾时发生的操作。如果没有更多的行可用,则会出现No Data情况,SQLSTATE值为'02000'。要检测此条件,可以为它或NOT FOUND条件设置句柄。
DECLARE not_found CONDITION FOR SQLSTATE '02000'; - DECLARE HANDLER:用于声明错误处理器,用于在处理过程中捕获和处理异常。例如: DECLARE CONTINUE HANDLER FOR not_found SET @name = 'Not found'; 5.总结 在达梦数据库管理系统中,DECLARE是一种用于声明变量和游标的关键字。通过DECLARE关键字,可以声明变量,...
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = 1; REPEAT FETCH cur INTO x; IF NOT done THEN SET media := media + x; SET tot := tot + 1; END IF; UNTIL done END REPEAT; CLOSE cur; END; I tried also simple procedures using just a declaration like: ...