Oracle实践--PL/SQL综合之分页存储过程

Oracle PL/SQL分页的存储过程

         Oracle，分页，存储过程三个词结合起来，来个综合点的小练习，运用之前的PL/SQL创建一个分页的存储过程，只需要简单几步即可。

1.声明一个引用游标

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.编写存储过程

create or
replace procedure divideByPge
         (tableName varchar2,pageSize number,currentPage number,
                 totalPage out number,totalRecord
out number,results out cur_ref_type.cur_ref)--要带包名
is
v_sql varchar2(200);--用于写sql语句的
v_begin number;--开始位置
v_end number;--结束位置
begin
v_begin := (currentPage -1) * pageSize;
v_end := currentPage * pageSize;
v_sql :='select count(*) from '||tableName;--将表名字符串拼接sql语句
execute immediate v_sql into totalRecord;--查询所有记录
totalPage :=ceil(totalRecord/pageSize);--计算总页数
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)--要带包名
is
 v_sql varchar2(200);--用于写sql语句的
 v_begin number;--开始位置
 v_end number;--结束位置
begin
 v_begin := (currentPage -1) * pageSize;
 v_end := currentPage * pageSize;
 v_sql :='select count(*) from '||tableName;--将表名字符串拼接sql语句
 execute immediate v_sql into totalRecord;--查询所有记录
 totalPage :=ceil(totalRecord/pageSize);--计算总页数
 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客户端调用

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);//分页单位
           cs.setInt(3, 
1);//当前页
           cs.registerOutParameter(4, OracleTypes.INTEGER);//注册输出参数
           cs.registerOutParameter(5, OracleTypes.INTEGER);
           cs.registerOutParameter(6, OracleTypes.CURSOR);//注册输出参数游标
           cs.execute();//执行
           ResultSet rs = (ResultSet)cs.getObject(6);//获得游标
           while(rs.next()){
               int empno = rs.getInt("empno");
               String ename = rs.getString("ename");
               System.out.println(empno+"-->"+ename);
           }
        } catch (ClassNotFoundException | SQLException e) {
           e.printStackTrace();
        }