1、基本語法： Sql代碼 #定義游標 declare fetchSeqCursor cursor for select seqname, value from sys_sequence; #使用游標 open fetchSeqCursor； #fetch數據 fetch cursor into _seqname, _value; #關閉游標 close fetchSeqCursor; 2、單游標例子： Sql代

1、基本語法：

Sql代碼

#定義游標

declare fetchSeqCursor cursor for select seqname, value from sys_sequence;

#使用游標

open fetchSeqCursor；

#fetch數據

fetch cursor into _seqname, _value;

#關閉游標

close fetchSeqCursor;

2、單游標例子：

Sql代碼

## define the flag for loop judgement

declare fetchSeqOk boolean;

## define the varient for store the data

declare _seqname varchar(50);

declare _value bigint(20);

## define the cursor

declare fetchSeqCursor cursor for select seqname, value from sys_sequence;

## define the continue handler for not found flag

declare continue handler for NOT FOUND set fetchSeqOk = true;

set fetchSeqOk = false;

open fetchSeqCursor;

fetchSeqLoop:Loop

if fetchSeqOk then

leave fetchSeqLoop;

else

fetch cursor into _seqname, _value;

select _seqname, _value;

end if;

end Loop;

close fetchSeqCursor;

3、嵌套的游標循環

Java代碼

## define the flag for loop judgement

declare fetchSeqOk boolean;

## define the varient for store the data

declare _seqname varchar(50);

declare _value bigint(20);

## define the cursor

declare fetchSeqCursor cursor for select seqname, value from sys_sequence;

## define the continue handler for not found flag

declare continue handler for NOT FOUND set fetchSeqOk = true;

set fetchSeqOk = false;

open fetchSeqCursor;

fetchSeqLoop:Loop

if fetchSeqOk then

leave fetchSeqLoop;

else

fetch cursor into _seqname, _value;

#嵌套的游標循環

begin

declare fetchSeqOk boolean default 'inner';

## define the cursor

declare cursor2 cursor for select .... from ...;

## define the continue handler for not

declare continue handler for NOT FOUND set fetchSeqOk = true;

set fetchSeqOk = false;

open cursor2;

fetchloop2 loop

if fetchSeqOk then

else

end if;

end loop;

close cursor2;

end;

#嵌套的游標循環結束

end if;

end Loop;

close fetchSeqCursor;

總結

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