1、简单SQL语句，HellWorld示例
–输出信息
begin
dbms_output.put_line(‘Oracle Hello World!’);
end;
2、变量的定义、使用
–定义变量
declare
sName varchar2(20);
begin
sName := ‘jack’;
dbms_output.put_line(sName);
end;
–常用类型
declare
sNum number(1);
sCount binary_integer := 0;
sSal number(7, 2) := 5000.00;
sDate date := sysdate;
sPI number(3, 2) := 3.14;
sValid boolean := true;
sName varchar2(20) := ‘Jackson’;
begin
dbms_output.put_line(‘sName:’ || sName);
dbms_output.put_line(‘sCount:’ || sCount);
dbms_output.put_line(‘sSal:’ || sSal);
dbms_output.put_line(‘sDate:’ || sDate);
dbms_output.put_line(‘sPI:’ || sPI);
–dbms_output.put_line(‘sValid:’ || sValid);
dbms_output.put_line(‘sName:’ || sName);
end;
–定义Table变量类型
declare
type type_table_emp_empno is table of emp.empno%type index by binary_integer;
empnos type_table_emp_empno;
begin
empnos(0) := 7369;
empnos(2) := 6789;
empnos(-1) := 6543;
dbms_output.put_line(empnos(-1));
end;
–定义record变量类型
declare
type type_record_dept is record (
deptno dept.deptno%type,
dname dept.dname%type,
loc dept.loc%type
);
temp type_record_dept;
begin
temp.deptno := 56;
temp.dname := ‘software’;
temp.loc := ‘gz’;
dbms_output.put_line(temp.deptno || ‘ ‘ || temp.dname || ‘ ‘ || temp.loc);
end;
–使用rowtype声明record变量
declare
temp dept%rowtype;
begin
temp.deptno := 57;
temp.dname := ‘it’;
temp.loc := ‘sz’;
dbms_output.put_line(temp.deptno || ‘ ‘ || temp.dname || ‘ ‘ || temp.loc);
end;
–sql语句完成变量赋值
declare
v$sal emp.sal%type;
v$ename emp.ename%type;
begin
select sal, ename into v$sal, v$ename from emp where rownum = 1;
dbms_output.put_line(v$sal || ‘ ‘ || v$ename);
end;
–sql语句完成rowtype变量赋值
declare
v_row_emp emp%rowtype;
begin
select * into v_row_emp from emp where empno = 7698;
dbms_output.put_line(v_row_emp.sal || ‘ ‘ || v_row_emp.ename);
end;
–sql语句完成变量插入数据
create table dept2 as select * from dept;
declare
deptno dept.deptno%type := 57;
dname dept.dname%type := ‘software’;
loc dept.loc%type := ‘gz’;
begin
insert into dept2 values(deptno, dname, loc);
commit;
end;