plsql

1.HelloWorld

DECLARE
	i integer;
begin
	DBMS_OUTPUT.PUT_LINE(‘hello world‘);
end;

2.Assignment

DECLARE
	V_NAME varchar(20) := ‘张三‘;
	V_SAL NUMBER;
	V_ADDR VARCHAR(200);
BEGIN
	V_SAL := 1500
	DBMS_OUTPUT.PUT_LINE(‘姓名：‘||V_NAME||‘, 薪水‘||V_SAL)
END

3.SELECT

DECLARE
	V_NAME emp.ename%TYPE;
	V_SAL emp.sal%TYPE;
BEGIN
	SELECT ename, sal into V_NAME, V_SAL FROM emp where empno=7839;
	DBMS_OUTPUT.PUT_LINE(‘姓名：‘||V_NAME||‘, 薪水‘||V_SAL)
END

4.RECORD

DECLARE
	v_emp emp%ROWTYPE
BEGIN
	SELECT * into v_emp FROM emp where empno=7839;
	DBMS_OUTPUT.PUT_LINE(‘姓名：‘||v_emp.ename||‘, 薪水‘||v_emp.sal);
END

5.IF STMT

DECLARE
	v_count NUMBER;
BEGIN
	SELECT count(1) INTO v_count FROM EMP;
	IF v_count > 20 THEN
		DBMS_OUTPUT.PUT_LINE(‘记录超过20条‘||NUMBER);
	ELSIF v_count >= 10 THEN
		DBMS_OUTPUT.PUT_LINE(‘记录超过10条‘||NUMBER);
	ELSE
		DBMS_OUTPUT.PUT_LINE(‘记录10条以下‘||NUMBER);
	END IF;
END;

6.LOOP

-- 循环打印1~10
DECLARE
	v_num NUMBER := 1;
BEGIN
	LOOP
		EXIT WHEN v_num > 10;
		DBMS_OUTPUT.PUT_LINE(v_num);
	END LOOP;
END;

7.CURSOR

DECLARE
	-- cursor
	CURSOR c_emp IS SELECT ename, sal FROM emp;
	-- data
	v_ename emp.ename%TYPE;
	v_sal emp.sal%TYPE;
BEGIN
	-- open cursor
	OPEN c_emp;
	-- loop
	LOOP
		-- get data
		FETCH c_emp INTO v_ename, v_sal;	
		-- exit
		EXIT WHEN c_emp%NOTFOUND;
		DBMS_OUTPUT.PUT_LINE(v_ename||‘-‘||v_sal);
	END LOOP;
	-- close
	CLOSE c_emp;
END;

8.PARAM CURSOR

DECLARE
	-- cursor
	CURSOR c_emp(v_deptno emp.deptno%TYPE) IS SELECT ename, sal FROM emp where deptno=v_deptno;
	-- data
	v_ename emp.ename%TYPE;
	v_sal emp.sal%TYPE;
BEGIN
	-- open cursor
	OPEN c_emp(10);
	-- loop
	LOOP
		-- get data
		FETCH c_emp INTO v_ename, v_sal;	
		-- exit
		EXIT WHEN c_emp%NOTFOUND;
		DBMS_OUTPUT.PUT_LINE(v_ename||‘-‘||v_sal);
	END LOOP;
	-- close
	CLOSE c_emp;
END;

9.Procedure

-- 创建存储过程
CREATE OR REPLACE PROCEDURE p_hello as
BEGIN
	DBMS_OUTPUT.PUT_LINE(‘hello world‘);
END p_hello;

-- 调用存储过程
BEGIN
	p_hello;
	p_hello;
	p_hello;
END;
-- 或者
exec p_hello;

10.PARAM Procedure

-- 创建存储过程
CREATE OR REPLACE PROCEDURE query_emp(i_empno IN emp.empno%TYPE) as
	v_name emp.name%TYPE;
	v_sal emp.sal%TYPE;
BEGIN
	SELECT ename, sal into v_name, v_sal FROM emp where empno = i_empno
	DBMS_OUTPUT.PUT_LINE(v_name || ‘ - ‘ || v_sal);
END query_emp;

-- 调用
DECLARE
	i INTEGER := 7839;
BEGIN
	query_emp(i);
END;

-- 或者
exec query_emp(7839);

11.INPUT OUTPUT

-- 创建存储过程
CREATE OR REPLACE PROCEDURE query_emp(i_empno IN emp.empno%TYPE, o_sal OUT emp.sal%TYPE) AS
BEGIN
	SELECT sal into sal FROM emp where empno = i_empno
END query_emp;

-- 调用
DECLARE
	v_sal emp.sal%TYPE ;
BEGIN
	query_emp(7839, v_sal);
	DBMS_OUTPUT.PUT_LINE(v_sal);
END;

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