/* Open up a cursor for loop, also selecting * the "p" function which will write rows to * t2 for every row fetched from t1. */ FOR crec IN (Select tcol, p(tcol) FROM t1) LOOP -- Break out of the loop immediately EXIT; END LOOP; END; / Select COUNT(*) FROM t2; 注意:%...
mycursor cursor(p_year integer) for select title,release_year from film where release_year=p_year; --定义游标并绑定sql语句 begin open mycursor(p_year); --打开游标 loop --定义一个loop循环,来循环的抓取游标的行 fetch mycursor into res_film; exit when not found; --当循环抓取带最后一行之...
opencurs1forselectreplace(word,' ','') from spam_keyword; --在loop前打开游标并绑定好范围,query定义范围的时候就把空格都替换掉 <<loop1>> --标签 loop fetch curs1 into str; ifnot foundthenexit; endif; i:=0; --每一次游标完成赋值后就把i初始化为0 <<loop2>> loop i:=i+1; strreturn...
end loop_cursor_for; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 复制代码 当游标中的所有记录都取出来后,FOR循环就会自动终止,这里不用显示OPEN、CLOSE游标,PL/SQL引擎会自动处理。 上面的循环语句都可以用EXIT 或者 EXIT WHEN来终止其循环,但最好不要这样做,因为这样可能会造成循环的逻辑出现问题...
cursor=conn.cursor() cursor.execute(f'LISTEN tab;') def attach_partition(table,date): with conn.cursor()as cs: cs.execute('ALTER TABLE "%s" ATTACH PARTITION "%s_%s" FOR VALUES IN (\'%s\')' %(table, table, date,date)) ...
2.1. OPEN FOR query OPEN unbound_cursorvar[ [ NO ]SCROLL ] FOR query; The cursor variable here should be a simple refcursor variable that has not been opened. The query must be a SELECT, or something else that returns rows (such as EXPLAIN). The query is treated in the same way as...
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: [<>]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 CONTINUE 语句退出或者跳到执行的嵌套循环中...
关闭游标:在循环结束后,使用CLOSE语句关闭游标。例如:CLOSE cursor_name; 完整的示例代码如下所示: 代码语言:sql 复制 DECLAREcursor_nameCURSORFORSELECTcolumn1,column2FROMtable_name;OPENcursor_name;LOOPFETCHcursor_nameINTOvariable1,variable2;EXITWHENNOTFOUND;-- 在这里进行处理操作ENDLOOP;CLOSEcursor_name; ...
END LOOP; RETURN encrypted_text; END; $$ LANGUAGE plpgsql; CREATE OR REPLACE FUNCTION custom_decrypt(encrypted_text text) RETURNS text AS $$ DECLARE decrypted_text text := ''; char_code integer; BEGIN FOR i IN 1..length(encrypted_text) LOOP ...
Define an implicit PL/SQL cursor using a FOR Loop. The cursor runs a query and stores values returned into a record. A loop iterates over the cursor data set and prints the result. BEGIN FOR item IN (SELECT last_name, job_id FROM employees WHERE job_id LIKE '%MANAGER...