PostgreSQL 提供了 4 种循环执行命令的语句:LOOP、WHILE、FOR 和 FOREACH 循环,以及循环控制的 EXIT 和 CONTINUE 语句。 首先,LOOP 用于定义一个无限循环语句: [<<label>>]LOOPstatementsENDLOOP[label]; 一般需要使用 EXIT 或者 RETURN 语句退出循环,label 可以用于 EXIT 或者
7.带参数的cursor CURSOR C_USER(C_ID NUMBER) IS SELECT NAME FROM USER WHERE TYPEID=C_ID; OPEN C_USER(变量值); LOOP FETCH C_USER INTO V_NAME; EXIT FETCH C_USER%NOTFOUND; do something END LOOP; CLOSE C_USER; 1. 2. 3. 4. 5. 6. 7. 8. 8.用pl/sql developer debug 连接数据...
create or replace procedure allEmps is --声明游标 cursor c1 is select * from emps; begin for v_row in c1 loop dbms_output.put_line(v_row.ename||'--->'||v_row.job||'--->'||v_row.sal); end loop; end; --调用 begin allemps(); end; 1. 2. 3. 4. 5. 6. 7. 8. 9....
This topic provides reference information about cursor compatibility between Microsoft SQL Server 2019 and Amazon Aurora PostgreSQL. It introduces the concept of cursors and their role in database operations, explaining how they allow developers to work with result sets ...
Stored procedure cursor variables: SQL%ISOPEN,SQL%FOUND,SQL%NOTFOUND,SQL%ROWCOUNT,cursor%ISOPEN,cursor%FOUND,cursor%NOTFOUND,cursor%ROWCOUNT; Scheduled task advanced package: DBMS_JOB.SUBMIT,DBMS_JOB.ISUBMIT,DBMS_JOB.REMOVE,DBMS_JOB.BROKEN,DBMS_JOB.CHANGE,DBMS_JOB.WHAT,DBMS_JOB.NEXT_DATE,DBMS_...
One alternative is to use a temporary table and a cursor. Binds Unlike other relational databases like Oracle, PostgreSQL does not support bind variables. Instead, PostgreSQL uses the PREPARE statement to achieve similar results. SQL Server supports bind variables. Each parameter marker in ...
nested loop join: The right relation is scanned once for every row found in the left relation. This strategy is easy to implement but can be very time consuming. (However, if the right relation can be scanned with an index scan, this can be a good strategy. It is possible to use valu...
moving your cursor over a resource icon. –View which resources at each layer are affected when the resource running status is abnormal. –Double-click a resource icon to go to the Topology page. Only details of some resources can be viewed. ...
WHILE row_count() > 0 LOOP DELETE FROM num_test WHERE ctid IN ( SELECT ctid FROM num_test LIMIT 10) END LOOP; Examples Change the time zone of the connected session. SET SESSION DateStyle to POSTGRES, DMY; SET SELECT NOW(); now Sat 09 Sep 1...
CREATE OR REPLACE FUNCTION public.foo() RETURNS refcursor AS $$ declare c cursor for select 1; r refcursor; begin open c; r := 'c'; return r; end; $$ LANGUAGE plpgsql; select * from plpgsql_check_function('foo', extra_warnings =>false, compatibility_warnings => true); ┌────...