练习 1:导入型形式参数(in类型)
CREATE OR REPLACE PROCEDURE raise_salary (p_id IN emp.empno%TYPE) IS --变量声明 BEGIN UPDATE emp SET sal = sal * 1.1 WHERE empno = p_id; END raise_salary; /
存储过程的调用:
--方法一: EXECUTE raise_salary (7839); --方法二: declare v_empno emp.empno%type :=&p_empno; begin RAISE_SALARY(v_empno); end; / SQL>SHOW ERROR --查看编译错误;
练习 2:导出型形式参数(out类型)
CREATE OR REPLACE PROCEDURE query_emp (p_id IN emp.empno%TYPE, p_name OUT emp.ename%TYPE, p_salary OUT emp.sal%TYPE, p_comm OUT emp.comm%TYPE) IS BEGIN SELECT ename, sal, comm INTO p_name, p_salary, p_comm FROM emp WHERE empno = p_id; END query_emp; /
存储过程的调用:
----方法一: VARIABLE g_name VARCHAR2(25) VARIABLE g_sal NUMBER VARIABLE g_comm NUMBER EXECUTE query_emp(7369, :g_name, :g_sal, :g_comm); PRINT ----方法二: declare v_empno emp.empno%type:=7499; v_sal emp.sal%type; v_ename emp.ename%type; v_comm emp.comm%type; begin query_emp(v_empno,v_ename,v_sal,v_comm); dbms_output.put_line(v_ename||‘ ‘||v_sal||‘ ‘||v_comm); end; /
练习 3:导入/导出型形式参数(in/out类型)
CREATE OR REPLACE PROCEDURE format_phone (p_phone_no IN OUT VARCHAR2) IS BEGIN p_phone_no := ‘(‘ || SUBSTR(p_phone_no,1,3) || ‘)‘ || SUBSTR(p_phone_no,4,3) || ‘-‘ || SUBSTR(p_phone_no,7); END format_phone; /
存储过程的调用:
----方法一: VARIABLE g_phone_no VARCHAR2(15); BEGIN :g_phone_no:=‘8006330575‘; format_phone (:g_phone_no); END; / ----方法二: VARIABLE g_phone_no VARCHAR2(15); :g_phone_no:=‘8006330575‘; PRINT g_phone_no EXECUTE format_phone (:g_phone_no) PRINT g_phone_no
练习 4:带有default值的参数
----创建序列: create sequence departments_seq start with 50; CREATE OR REPLACE PROCEDURE add_dept (p_name IN dept.dname%TYPE DEFAULT ‘unknown‘, p_loc IN dept.loc%TYPE DEFAULT ‘BJ‘) IS BEGIN INSERT INTO dept(deptno, dname, loc) VALUES (departments_seq.NEXTVAL, p_name, p_loc); END add_dept; / ----存储过程的调用: BEGIN add_dept; add_dept (‘TRAINING‘, ‘SH‘); END; /
练习 5:校验数据存在否
CREATE OR REPLACE PROCEDURE valid_deptno (v_deptno IN d.deptno%TYPE,V_RETURN OUT BOOLEAN) IS v_dummy VARCHAR2(1); BEGIN SELECT ‘x‘ INTO v_dummy FROM d WHERE deptno = v_deptno; IF SQL%FOUND THEN V_RETURN:=TRUE; END IF; EXCEPTION WHEN NO_DATA_FOUND THEN V_RETURN:=FALSE; END valid_deptno; / ----调用 DECLARE V_FLAG BOOLEAN; BEGIN valid_deptno(90,V_FLAG); if v_flag then DBMS_OUTPUT.PUT_LINE(‘The department exist!‘); else DBMS_OUTPUT.PUT_LINE(‘The department not exist!‘); end if; END; /
练习 6:创建增加雇员的过程
CREATE OR REPLACE PROCEDURE new_emp (v_ename emp.ename%TYPE, v_job emp.job%TYPE DEFAULT ‘SALESMAN‘, v_mgr emp.mgr%TYPE DEFAULT 7839, v_sal emp.sal%TYPE DEFAULT 1000, v_comm emp.comm%TYPE DEFAULT 0, v_deptno emp.deptno%TYPE DEFAULT 30) IS V_FLAG BOOLEAN; BEGIN valid_deptno(v_deptno,V_FLAG); IF V_FLAG THEN INSERT INTO emp VALUES (seq_empno.NEXTVAL, v_ename, v_job, v_mgr, TRUNC (SYSDATE, ‘DD‘), v_sal, v_comm, v_deptno); ELSE DBMS_OUTPUT.PUT_LINE(‘Invalid Deptno ,try again!‘); END IF; END new_emp; /
练习 7:分页查询
create or replace procedure TABLEPAGE_SELECT (v_page_size number,v_current_page number) as cursor c(v_page_size number,v_current_page number) is SELECT * FROM (select rownum rn,emp.* FROM emp WHERE rownum <= v_page_size*v_current_page) WHERE rn >= (v_page_size*v_current_page-(v_page_size-1)); begin dbms_output.put_line(‘pagesize : ‘||v_page_size||‘ rows‘); dbms_output.put_line(‘current page : ‘||v_current_page||‘ page‘); for r in c(v_page_size,v_current_page) loop dbms_output.put_line(‘employee name : ‘||r.ename||‘ employee‘‘s salary : ‘||r.sal); end loop; end; / 存储过程的调用: exec TABLEPAGE_SELECT(5,2);
练习 8:本地动态SQL语句(execute immediate)
create or replace procedure proc_test ( table_name in varchar2, --表名 field1 in varchar2, --字段名 datatype1 in varchar2, --字段类型 field2 in varchar2, --字段名 datatype2 in varchar2 --字段类型 ) as str_sql varchar2(500); begin str_sql:=‘create table ‘||table_name||‘(‘||field1||‘ ‘||datatype1||‘,‘||field2||‘ ‘||datatype2||‘)‘; execute immediate str_sql; --动态执行DDL语句 exception when others then null; end ; /
给动态语句传值(USING 子句)
declare l_depnam varchar2(20) := ‘testing‘; l_loc varchar2(10) := ‘Dubai‘; begin execute immediate ‘insert into dept values (:1, :2, :3)‘ using 50, l_depnam, l_loc; commit; end;
为procedure加密(Wrap加密)
用法:
wrap的用法还是比较简单的,一个命令就可以实现加密,以下是命令的格式:
wrap iname=input_file [ oname=output_file ]
iname:指定的是源文件
oname:指定的是转换后加密文件,oname选项可以省略如果省略wrap命令会自动生成文件名一模一样的加密文件,后缀为.plb,当然你也可以指定自己命名方式。
执行编译方法:在SQLplus环境执行 @output_file.plb
注:目前该加密方式已经被破译。