方法一:确保在事务块内声明游标 在PostgreSQL 中,可以使用以下步骤在事务块内声明和使用游标: sql BEGIN; -- 开始事务 -- 声明游标 DECLARE my_cursor CURSOR FOR SELECT column_name FROM table_name WHERE condition; -- 打开游标 OPEN my_cursor; -- 使用游标(例如,通过 FETCH 循环获取数据) LOOP FETCH FR...
As you have outlined above through theSQL DECLARE documentation, the PostgreSQL client will submit a query likeDECLARE liahona CURSOR FOR ..., which CrateDB doesn't know how to process. With kind regards, Andreas. P.S.:@bputtalready reported the same thing within#7573. I don't know whethe...
Unless WITH HOLD is specified, the cursor created by this command can only be used within the current transaction. Thus, DECLARE without WITH HOLD is useless outside a transaction block: the cursor would survive only to the completion of the statement. Therefore PostgreSQL reports an error if ...
递归PostgreSQL函数失败,并显示«游标已在使用»消息 、、、 as $$ curcursor(a int) for select * from generate_series(1,a); for c in cur(3在谷歌搜索了一个变通方法后,我在邮件列表存档中找到了这个,它提到了未绑定的游标没有这个限制,即: mycursor refcursor; open mycursorfor ...;但是我不知...
PostgreSQL Supported SQL99 Syntax and Description TheDECLARE CURSORcommand works by specifying aSELECTstatement. Each row returned by theSELECTstatement may be individually retrieved and manipulated. TheDECLARE CURSORcommand also defines the characteristics of a server-side cursor. The characteristics might ...
linux的declare linux中declare linux中的declare declare postgresql declare postgres declare js declare mysql declare用法 mysql declare日期 mysql 视图declare declare-styleable DECLARE_DYNAMIC和DECLARE_DYNCREATE之间的区别? declare在mysql中 Declare cursor未执行 页面内容是否对你有帮助? 有帮助 没帮助 ...
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存储过程开发语言 存储过程开发语言是业务应用常用的一种数据库开发语言,被很多应用开发同学所熟悉,PolarDB PostgreSQL版(兼容Oracle)对Oracle存储过程语言有着很高的兼容度,包括COLLECTION、GOTO、SAVEPOINT、ROLLBACK TO、CURSOR、... 声明变量 例如,将 SYSDATE 分配给 DATE 类型的变量会使该变量具有当前调用的时间,而不...
存储过程中使用holdable cursor 背景信息 在存储过程中使用动态游标时,PostgreSQL原生不支持将动态游标设置为holdable模式(非存储过程中支持),如果在存储过程中打开一个动态游标并执行事务修改保存操作后,再次尝试获取数据将会报错,因为进行事务保存操作时当前事务... PL 编译和调试 本文档以创建 OceanBase Oracle 类...
In PostgreSQL you can use the following procedure: PostgreSQL: CREATEORREPLACEPROCEDUREsp_getCities(OUTcur REFCURSOR)AS$$BEGINOPENcurFORSELECT'Boston'ascityUNIONALLSELECT'Barcelona'ascityUNIONALLSELECT'Munich'ascity;END; $$LANGUAGEplpgsql; Note that a RECURSOR parameter is added and the cursor declara...