--第一個PL/SQL程序 declarevar_empname??varchar2(20)?; begin select?empname??into?var_empname?from??employeewhere?empid=&param_empid;dbms_output.put_line(var_empname); end; --rowtype declare row_result?employee%rowtype; begin select?*??into?row_result?from?employee?where?empid=&param_empid; dbms_output.put_line(row_result.empid||'-'||row_result.empname||'--'||row_result.Salary); end;---------------------------Day1203練習------------------------------------- ---1.?圓周率PI?假定取常量3.14?，讓用戶輸入圓的半徑，用PL/SQL?程序計算出圓的面積， --并輸出到控制臺。 declare constant_PI??number(3,2):=3.14; var_r?number:=&param_r; begin dbms_output.put_line('圓的面積是'||round(constant_PI*var_r*var_r,3)); end;--2.用戶輸入的某員工號查詢出該員工所在的部門， --根據其所在部門的不同，修改工資。比如：如果部門編號（自己定）是10， --該部門全體員工的工資工資改為1000；如果部門編號是20，工資改為1200； --如果部門編號是30，工資定為1500；以此類推...如果都不滿足，工資定為1800。 --分別用if和case語句實現--case declare var_deptid?employee.deptid%type; row_result?employee%rowtype; begin select?*?into?row_result?from?employee?where?empid=&param_empid; var_deptid:=row_result.deptid; case?var_deptidwhen?110?then?update?employee?set?Salary=1000?where?deptid=110;when?120?then?update?employee?set?Salary=1200?where?deptid=120;when?130?then?update?employee?set?Salary=1500?where?deptid=130;elseupdate?employee?set?Salary=1800?;end?case; end; select?*?from?employee--if declare var_deptid?employee.deptid%type; row_result?employee%rowtype; begin select?*?into?row_result?from?employee?where?empid=&param_empid; var_deptid:=row_result.deptid; if?var_deptid=110?thenupdate?employee?set?Salary=180?where?deptid=110;elsif?var_deptid=120?then?update?employee?set?Salary=1200?where?deptid=120;elsif?var_deptid=130?then?update?employee?set?Salary=1500?where?deptid=130;elseupdate?employee?set?Salary=1800?;end?if; end; ------------------- select?*?from?employee---4:屬性數據類型type,if..then..else....end?if --根據用戶用戶輸入的員工號，查詢某個員工的工資， --如果工資大于某個數（比如1000）,將該員工工資減100，否則加100。 select?*?from?employeedeclarevar_sal?employee.salary?%type; begin select?Salary?into?var_sal?from?employee?where?empname='武器大師'; if?var_sal?<600?thenupdate?employee?set?Salary?=Salary+100?where?empname='武器大師';else?update?employee?set?Salary?=Salary-100?where?empname='武器大師';end?if;? end;--5:?case..when..else --輸入一個字母A、B、C分別輸出對應的級別信息。具體為： --A對應“Excellent”，B對應“Very?Good”,?C對應"Not?Bad",其他則對應“No?Such?Data” declare var_zimu?varchar2(20):='&ss'; var_result?varchar2(20); begin var_result:=case?var_zimu? when?'A'?then?'Excellent' when?'B'?then?'Very?Good' when?'C'?then?'Not?Bad' else?'No?Such?Data' end; dbms_output.put_line(var_result); end;--6:從1到100的累加?（循環結構）while+loop declare v_num?integer?:=1; v_sum?integer?:=0; begin while?v_num<=100loopv_sum?:=?v_sum+v_num;dbms_output.put(v_num);if?v_num<10??thendbms_output.put('+');end?if;v_num:=v_num+1;end?loop;dbms_output.put('=');dbms_output.put_line(v_sum); end;--6:從1到100的累加?for...in.+loop declare?var_num?integer;var_sum?integer:=0; begin? for?var_num?in?1..100 loop?var_sum?:=var_sum+var_num;dbms_output.put(var_num);if?var_num<100?then?dbms_output.put('+');end?if; end?loop; dbms_output.put('='); dbms_output.put_line(var_sum); end;----無參存儲過程 create?or?replace?procedure?getempCount asempcount??number;beginselect?count(*)?into?empcount?from??employee;dbms_output.put_line('總共有'||empcount||'個員工');end; --- call?getempcount();-----只帶輸入參數的存儲過程 create?or?replace?procedure?showsalarybyempid(param_empid?number) as var_salary?number; beginselect?salary??into?var_salary?from?employee?where?empid=param_empid;dbms_output.put_line('該員工的工資為：'||var_salary); end;? -- call?showsalarybyempid(1); --帶輸入和輸出參數的存儲過程 create?or?replace?procedure?showempbyempid(param_empid?number,oneemp?out?employee%rowtype) as? begin select?*?into?oneemp?from?employee?where?empid=param_empid; end; --- declare row_oneemp?employee%rowtype; beginshowempbyempid(&empid,row_oneemp);--實際參數dbms_output.put_line(row_oneemp.empname||'--'||row_oneemp.hiredate);end;--cursor(游標)對結果集的操作 declare?cursor??cur_emp(minSalary?in?number,maxSalary?in?number) is? select?*?from?employee?where?Salary>=minSalary?and?Salary<=maxSalary;oneemp?employee%rowtype; beginopen?cur_emp(500,800);fetch?cur_emp?into?oneemp;while?cur_emp%found?loopdbms_output.put_line(oneemp.empname||'--'||oneemp.Salary);fetch?cur_emp?into?oneemp;?end?loop;close?cur_emp; end; --trigger(觸發器) create?or?replace?trigger?tri_department_id?beforeinsert?on?department?for?each?rowbeginselect?seq_department.nextval??into?:new.departid??from?dual;end;------------ insert?into?department(departname,remark)?values('打野部','先buff')select?*?from?department------------------------select?*?from?employee----分頁?先有結果集再有rownum --考慮排序必須得有三層查詢 select?*?from?( select?rownum?num,r.*?from(select?*?from?employee?order?by?empid)?r?where?rownum?<=7) where?num>=3; ------ select?*?from?(select?rownum?num,e.*?from?employee?e?where?rownum?<=7) where?num>=3

轉載于:https://blog.51cto.com/xiangzhengxian/1593041

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