Oracle database pl/sql procedure body, cursor, stored procedure

PL/SQL The process of body 
DECLARE
      -- Declaration part 
BEGIN
      -- Executive part 
END;      

DECLARE
	sname varchar(20):='Jack';
BEGIN
	sname :='HI!'||sname;
	DBMS_OUTPUT.PUT_LINE(sname);
END;
-- Results output  ： HI!Jack

The cursor
A cursor is a pointer to a query result set , The records in the query result set can be fetched one by one through the cursor .

 Cursor declaration 
CURSOR  You name 
IS SELECT Result set query statement ;

 Execute cursor 
OPEN  You name 
FETCH  You name  INTO  Variable 1[, Variable 2..]
 perhaps 
FETCH  You name  INTO  Cursor variable ;
CLOSE;

Cursor properties ：%FOUND and %NOTFOUND
%FOUND： Used to determine whether the cursor extracts data from the result set . If data is extracted , The return value is TRUE, Otherwise, the return value is FALSE.
%NOTFOUND： And %FOUND contrary , If data is extracted, the return value is FALSE, Otherwise TRUE.

DECLARE
	CURSOR mycursor
	IS SELECT sname FROM student_0;
	row_cursor  mycursor%ROWTYPE;
BEGIN
	OPEN mycursor;
	LOOP
		FETCH mycursor INTO row_cursor;
		EXIT WHEN mycursor%NOTFOUND;
		DBMS_OUTPUT.PUT_LINE(row_cursor.sname);
	END LOOP;
	CLOSE mycursor;
END;

DECLARE
	CURSOR mycursor
	IS SELECT sname FROM student_0;
BEGIN
	FOR row_cursor IN mycursor LOOP
		DBMS_OUTPUT.PUT_LINE(row_cursor.sname);
	END LOOP;
END;	

Create stored procedure

CREATE [OR REPLACE] PROCEDURE  The process of ( Parameters 1 [IN | OUT | IN OUT]  data type , Parameters 2[IN | OUT | IN OUT]  data type ...)
IS | AS
PL/SQL  Process style sentences ;

Calling stored procedure

BEGIN
	 The process of [ Parameters ];
END;

Delete stored procedure

DROP PROCEDURE  The process of ;

CREATE OR REPLACE PROCEDURE SP_MYEMP(P_DEPTNO IN NUMBER,
									 P_HIREDATE OUT DATE,
									 P_JOB_ENAME IN OUT VARCHAR2)
AS
	V_SAL NUMBER;
BEGIN
	SELECT E.ENAME,E.SAL,E.HIRDATE
	INTO P_JOB_ENAME,V_SAL,P_HIRDATE
	FROM EMP E
	WHERE E.DEPTNO=P_DEPTNO
	AND E.JOB=P_JOB_ENAME;
	DBMS_OUTPUT.PUT_LINE(P_JOB_NAME||' '||V_SAL||' '||P_HIREDATE);
END;
	-- Calling stored procedure 
DECLARE 
	V_JOB_ENAME varchar2(20) :='MANAGER';
	V_HIREDATE DATE;
BEGIN
	SP_MYEMP(20,V_HIREDATE,V_JOB_ENAME);
END;

A package is a collection of related stored procedures 、 function 、 Variable 、 Constants and cursors, etc PL/SQL Put together , And a program block endowed with certain management functions .
Create enclaves

CREATE [OR REPLACE] PACKAGE BODY mypackage
AS | IS

PROCEDURE  The process of ( Parameters )
IS | AS
BEGIN
	 The process of body ;
END [ The process of ];

END;