在PL/SQL中,我们需要使用DECLARE语句来声明游标。例如,以下代码声明了一个名为my_cursor的游标,用于查询dept表中的dname字段: DECLARE CURSOR my_cursor IS SELECT dname FROM dept; 打开游标 在声明游标后,我们需要使用OPEN语句来打开游标。例如: OPEN my_cursor; 获取数据 使用FETCH语句从游标中获取数据。FETCH语句...
CURSOR c_emp IS SELECT ename,sal FROM emp; BEGIN OPEN c_emp; FETCH c_emp INTO v_ename,v_salary; DBMS_OUTPUT.PUT_LINE('Salary of Employee'|| v_ename ||'is'|| v_salary); FETCH c_emp INTO v_ename,v_salary; DBMS_OUTPUT.PUT_LINE('Salary of Employee'|| v_ename ||'is'|| v_...
from pm4h_mo.mdl_resmodel t1, pm4h_mo.mdl_resmodeltable t2 where t1.modelname='''||moTypeName||'''and t1.modelid=t2.modelid';executeimmediate v_sqlintov_count_number;if(v_count_number<>0)then--存在实体表,查询实体表名v_sql :='select t2.tablename from pm4h_mo.mdl_resmodel t...
cursor cursor_name (parameter list) is select ... 游标从declare、open、fetch、close是一个完整的生命旅程。当然了一个这样的游标是可以被多次open进行使用的,显式cursor是静态cursor,它的作用域是全局的,但也必须明白,静态cursor也只有pl/sql代码才可以使用它。下面看一个简单的静态显式cursor的示例: declare ...
%ROWCOUNT---SQL语句影响的行数 %ISOPEN---游标是否打开,始终为FALSE (1)%NOTFOUND的使用 (2)%FOUND的使用 (3)%ROWCOUNT的使用 (二)显式游标 1)基本用法:使用(用cursor .. is标明): 1.声明游标:cursor .. is select 2.打开游标:open 3.结果集控制:fetch .. into .. ...
open c1;fetch c1 into r;whilec1%found loopifr.flowsid=PFlowsID thenv:=1;elsev:=0;endif;UPDATEwf_flowsSETisValid=vWHERECURRENTOFc1;fetch c1 into r;end loop;close c1;commit;end; 引用游标ref cursor 弱类型引用游标,就是不指定游标将要提取的数据行的类型 ...
Make sure the cursor was declared properly. PLS-00121 only the set function COUNT may take * as an argument Cause: The asterisk (*) option was used in the argument list of a SQL group function other than COUNT. For example, the code might look like: SELECT SUM(*) INTO emp_count ...
Action: Remove the function call from the SQL statement. Or, replace the function call with a local variable. For example, the following statement is illegal: INSERT INTO errors VALUES (SQLCODE, SQLERRM); However, you can assign the values of SQLCODE and SQLERRM to local variables, then use...
PL/SQL过程;除了抓取部分,我还包括了ref游标内容的显示: SQL> declare 2 cursor c is select t_row(deptno, dname, loc) from dept; 3 pt1 t_tab; 4 rcur sys_refcursor; 5 -- 6 -- local variables to check what's in ref cursor
You can declare a PL/SQL record that resembles a row in a database table without listing all the columns using the % ROWTYPE attribute. Even when columns are added to the table, your code continues to work. You can build a view or declare a cursor to choose the right columns and ...