11.1 execute immudiate

 

用法1：立刻执行sql语句

v_sql := 'insert into tt';

execute immediate v_sql;

用法2：立刻执行sql语句，并赋值给某个变量

    v_sql := 'select count(1) from student';

execute immediate v_sql into v_num;

这是为了举例,实际直接’select count(1) intp v_num from student’ 就可以.

用法3：带参数的sql

    v_sql:='select * from student t where t.name=:1 and t.age=:2';

    execute immediate v_sql using 'ZhangSan',23;

使用execute immudiate 为了拼接sql语句的情况:

Declare

 v_l1 varchar2(255);

 v_l2 varchar2(255);

Select compare,qty into v_l1,v_l2 from a;

Execute immudiate ‘select * from a1 where a1’||v_l1||’v_l2’

--compare的值为> < =