2009-11-02 | oracle批量绑定table类型变-- forall bulk collect用法以及测试案例
采用bulk collect可以将查询结果一次性地加载到collections中。而不是通过cursor一条一条地处理。可以在select into,fetch into,returning into语句使用bulk collect。注意在使用bulk collect时,所有的into变量都必须是collections.
--在select into语句中使用bulk collect
DECLARETYPE SalList IS TABLE OF emp.sal%TYPE;sals SalList;BEGIN-- Limit the number of rows to 100.SELECT sal BULK COLLECT INTO sals FROM empWHERE ROWNUM <= 100;-- Retrieve 10% (approximately) of the rows in the table.SELECT sal BULK COLLECT INTO sals FROM emp SAMPLE 10;
--在fetch into中使用bulk collect
DECLARETYPE DeptRecTab IS TABLE OF dept%ROWTYPE;dept_recs DeptRecTab;CURSOR c1 ISSELECT deptno, dname, loc FROM dept WHERE deptno > 10;BEGINOPEN c1;FETCH c1 BULK COLLECT INTO dept_recs;END;/
--在returning into中使用bulk collect
CREATE TABLE emp2 AS SELECT * FROM employees;DECLARETYPE NumList IS TABLE OF employees.employee_id%TYPE;enums NumList;TYPE NameList IS TABLE OF employees.last_name%TYPE;names NameList;BEGINDELETE FROM emp2 WHERE department_id = 30RETURNING employee_id, last_name BULK COLLECT INTO enums, names;dbms_output.put_line('Deleted ' || SQL%ROWCOUNT || ' rows:');FOR i IN enums.FIRST .. enums.LASTLOOPdbms_output.put_line('Employee #' || enums(i) || ': ' || names(i));END LOOP;END;/DROP TABLE emp2;oracle批量绑定forall bulk collect
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