ORACLE中建存储过程

--创建测试表
CREATE TABLE XIAOYAN
(
ID NUMBER PRIMARY KEY,
USERNAME VARCHAR2(24),
AGE VARCHAR2(3),
ADDRESS VARCHAR2(1024),
OTHER VARCHAR2(1024)
);

COMMENT ON TABLE XIAOYAN
    IS 'XIAOYAN表';
    COMMENT ON COLUMN XIAOYAN.ID
        IS '主键ID';
        COMMENT ON COLUMN XIAOYAN.USERNAME
            IS '用户名';
            COMMENT ON COLUMN XIAOYAN.AGE
                IS '年龄';
                COMMENT ON COLUMN XIAOYAN.ADDRESS
                    IS '地址';
                    COMMENT ON COLUMN XIAOYAN.OTHER
                        IS '其它';
--构造数据
INSERT INTO XIAOYAN(ID,USERNAME,AGE,ADDRESS,OTHER) VALUES (1, 'XIAOYAN', '24', 'CHINA', 'SUPERMAN');
INSERT INTO XIAOYAN(ID,USERNAME,AGE,ADDRESS,OTHER) VALUES (2, NULL, '24', 'CHINA', 'SUPERMAN');
                   
--创建测试存储过程                   
CREATE OR REPLACE PROCEDURE PRO_XIAOYAN
(
    T_ID IN NUMBER,
    T_NAME OUT VARCHAR2
)
IS
    V_USERNAME VARCHAR2(1024);
    V_COUNT NUMBER(8);
BEGIN
     SELECT COUNT(*) INTO V_COUNT FROM XIAOYAN;
     DBMS_OUTPUT.PUT_LINE('当前总数为：'||V_COUNT);
     IF V_COUNT = 0
        THEN DBMS_OUTPUT.PUT_LINE('等于：'||V_COUNT);
        ELSIF V_COUNT >=1
           THEN DBMS_OUTPUT.PUT_LINE('大于：'||V_COUNT);
           --具体业务
           SELECT nvl(USERNAME, 'NULL') INTO V_USERNAME FROM XIAOYAN WHERE ID = T_ID;
           T_NAME := V_USERNAME;
           DBMS_OUTPUT.PUT_LINE(T_NAME);
          
           ElSE
               DBMS_OUTPUT.PUT_LINE('其它：'||V_COUNT);
     END IF;
EXCEPTION
    WHEN OTHERS THEN
         T_NAME := 'EXCEPTION';
       ROLLBACK;

END PRO_XIAOYAN;

--回滚存储过程
DROP PROCEDURE PRO_XIAOYAN;