Oracle實踐--PL/SQL綜合之分頁存儲過程

Oracle PL/SQL分頁的存儲過程

         Oracle，分頁，存儲過程三個詞結合起來，來個綜合點的小練習，運用之前的PL/SQL創建一個分頁的存儲過程，只需要簡單幾步即可。

1.聲明一個引用遊標

create or
replace package cur_ref_type
as-- is or as can be used
type cur_ref is ref 
cursor;
end;

create or replace package cur_ref_type
as-- is or as can be used
type cur_ref is ref cursor;
end;

2.編寫存儲過程

create or
replace procedure divideByPge
         (tableName varchar2,pageSize number,currentPage number,
                 totalPage out number,totalRecord
out number,results out cur_ref_type.cur_ref)--要帶包名
is
v_sql varchar2(200);--用於寫sql語句的
v_begin number;--開始位置
v_end number;--結束位置
begin
v_begin := (currentPage -1) * pageSize;
v_end := currentPage * pageSize;
v_sql :='select count(*) from '||tableName;--將表名字符串拼接sql語句
execute immediate v_sql into totalRecord;--查詢所有記錄
totalPage :=ceil(totalRecord/pageSize);--計算總頁數
v_sql :='select * from (select rownum rn,'||tableName||'.* from '||tableName||' where rownum <= '||v_end||')
where rn > '||v_begin;
open  results for v_sql;
end;

create or replace procedure divideByPge
         (tableName varchar2,pageSize number,currentPage number,
                 totalPage out number,totalRecord out number,results out cur_ref_type.cur_ref)--要帶包名
is
 v_sql varchar2(200);--用於寫sql語句的
 v_begin number;--開始位置
 v_end number;--結束位置
begin
 v_begin := (currentPage -1) * pageSize;
 v_end := currentPage * pageSize;
 v_sql :='select count(*) from '||tableName;--將表名字符串拼接sql語句
 execute immediate v_sql into totalRecord;--查詢所有記錄
 totalPage :=ceil(totalRecord/pageSize);--計算總頁數
 v_sql :='select * from (select rownum rn,'||tableName||'.* from '||tableName||' where rownum <= '||v_end||') where rn > '||v_begin;
 open  results for v_sql;
end;

3.Java客戶端調用

String driver ="oracle.jdbc.driver.OracleDriver";
        String url  = "jdbc:oracle:thin:@localhost:1521:orcl";
        String username = "scott";
        String password = "ysjian";
        try {
           Class.forName(driver);
           Connection conn =
                        DriverManager.getConnection(url,username,password);
           CallableStatement cs = conn.prepareCall("{call
                                         divideByPge(?,?,?,?,?,?)}");
           cs.setString(1,"emp");//表名
           cs.setInt(2, 3);//分頁單位
           cs.setInt(3, 
1);//當前頁
           cs.registerOutParameter(4, OracleTypes.INTEGER);//註冊輸出參數
           cs.registerOutParameter(5, OracleTypes.INTEGER);
           cs.registerOutParameter(6, OracleTypes.CURSOR);//註冊輸出參數遊標
           cs.execute();//執行
           ResultSet rs = (ResultSet)cs.getObject(6);//獲得遊標
           while(rs.next()){
               int empno = rs.getInt("empno");
               String ename = rs.getString("ename");
               System.out.println(empno+"-->"+ename);
           }
        } catch (ClassNotFoundException | SQLException e) {
           e.printStackTrace();
        }