You would use aCURSOR FOR Loopwhen you want to fetch and process every record in a cursor. TheCURSOR FOR Loopwill terminate when all of the records in the cursor have been fetched. 译:当你每次想通过cursor来对每条记录进行取及操作时,就可以使用CURSOR FOR Loop。当cursor中所有的记录都取后,CUR...
cursormycursorisselect*fromcat; begin openmycursor; loop fetchmycursorintov_tablename,v_tabletype; null;--youcanusetablenameandv_tabletype endloop; closemycursor; endStudyCursor; 最近在看代码是,发现其实我们还有一个更方便的方法就是使用for in loop … end loop createorreplaceprocedureStudyFor( r...
FORrecordIN(select_statement)LOOPprocess_record_statements;ENDLOOP;Code language:PostgreSQL SQL dialect and PL/pgSQL(pgsql) In this case, the cursorFOR LOOPdeclares, opens, fetches from, and closes an implicit cursor. However, the implicit cursor is internal; therefore, you cannot reference it....
在PL/SQL中,游标可以用于遍历结果集并对每一行进行操作。游标通常与FOR循环一起使用。以下是一个示例,展示了如何在PL/SQL中使用游标和FOR循环: DECLARE CURSOR my_cursor IS SELECT column1, column2 FROM my_table; BEGIN FOR my_record IN my_cursor LOOP -- 在此处编写对每一行记录的操作 DBMS_OUTPUT.PUT...
The syntax for the CURSOR FOR LOOP in Oracle/PLSQL is: FORrecord_indexincursor_nameLOOP {...statements...} END LOOP; Parameters or Arguments record_index The index of the record. cursor_name The name of the cursor that you wish to fetch records from. ...
END LOOP; 关闭游标 CLOSE emp_cursor; 输出总薪水 DBMS_OUTPUT.PUT_LINE('Total salary: ' || total_salary); END; 相关问题与解答 问题1:PL/SQL游标是否可以用于INSERT、UPDATE或DELETE操作? 答案:不可以,PL/SQL游标主要用于检索查询结果集,而不是直接修改数据库中的数据,如果需要对数据进行插入、更新或删除...
1 PL/SQL中有两种类型的FOR循环：数字型FOR循环和游标型FOR循环。数值型FOR循环式传统的大家熟悉的“计数”循环，这种FOR循环的迭代次数在循环开始的时候就知道了。如果在FOR循环的范围处没有设置循环索引的递进方向从低到高或者从高到低（reverse将范围条件置反）。语法如下：FOR loopIndex IN [REVERSE] ...
简化了对游标的处理。当使用游标开发pl/sql应用程序时,为了简化程序代码,建议大家使用游标for循环。 1.语句格式一:先在定义部分定义游标,然后在游标for循环中引用该游标。 for record_name in cursor_name loop statement1; statement2; end loop; --curosr_name是已经定义的游标名,record_name是oracle系统隐含定义...
oracle pl sql for循环游标 EMP表在SCOTT用户下。用SCOTT/TIGER登录。 代码: DECLARE CURSOR C_JOB IS SELECT EMPNO, ENAME, JOB, SAL FROM EMP WHERE JOB = 'MANAGER'; C_ROW C_JOB%ROWTYPE; BEGIN FOR C_ROW IN C_JOB LOOP DBMS_OUTPUT.put_line(C_ROW.EMPNO || '-' || C_ROW.ENAME || '...
CURSOR c_employees IS SELECT name, salary FROM employees; v_name employees.name%TYPE; v_salary employees.salary%TYPE; BEGIN OPEN c_employees; LOOP FETCH c_employees INTO v_name, v_salary; EXIT WHEN c_employees%NOTFOUND; DBMS_OUTPUT.PUT_LINE('Name: ' || v_name || ', Salary: ' ||...