绑定变量学习示例-未完待续

 

 

示例一 plsql中使用绑定变量

[oracle@Oracle11g 2016]$ cat 021801.sql  修改前的sql语句 declare     type rc is ref cursor;     l_rc rc;     l_dummy all_objects.object_name%type;     l_start number default dbms_utility.get_time;     begin      for i in 1..1000 loop      open l_rc for    'select object_name from all_objects where object_id='||i;    fetch l_rc into l_dummy;    close l_rc;    end loop;    dbms_output.put_line(round((dbms_utility.get_time-l_start)/100,2)||'seconds...');    end;   /   [oracle@Oracle11g 2016]$ cat 021802.sql 修改后的sql语句 declare       type rc is ref cursor;     l_rc rc;     l_dummy all_objects.object_name%type;     l_start number default dbms_utility.get_time;     begin      for i in 1..1000 loop      open l_rc for    'select object_name from all_objects where object_id=:x' using i;    fetch l_rc into l_dummy;    close l_rc;    end loop;    dbms_output.put_line(round((dbms_utility.get_time-l_start)/100,2)||'seconds...');    end;   /

 

 

 

 

 

 

示例二 简单sql语句中使用绑定变量

定义变量 SQL> var a number;   给变量赋值 SQL> exec :a := 7803;   PL/SQL procedure successfully completed.   使用绑定变量 SQL> select object_id,object_name from all_objects where object_id=:a;    OBJECT_ID OBJECT_NAME ---------- ------------------------------       7803 V$DIAG_IPS_PACKAGE_INCIDENT