JDBC2.0 和可滚动的ResultSet,游标

JDBC2.0

ResultSet对象中的光标能够上下自由移动

能直接使用Java程序语言更新数据库表格的内容,而不需要写SQL语法

可以进行数据库的批处理操作

可滚动的ResultSet

TYPE_FORWARD_ONLY:

TYPE_SOROLL_SENSITIVE

       可以上下滚动,数据库中有更新的话,不能取得结果集改变的值

TYPE_SCROLL_INSENSITIVE

       可以上下滚动,能够取得结果集改变的值

以性能一个比一个差

这些定位操作都是在内存这中,而是全部把数据读出来再进行位,à性能差不建议使用

直接使用结果集更新操作

<%@page contentType="text/html;charset=gb2312"%> <%@page import="java.sql.*"%> <%        //定义数据库驱动程序        String dbdriver="sun.jdbc.odbc.JdbcOdbcDriver";        //定义数据库连接地址        String url="jdbc:odbc:mldn";        //定义数据库连接对象,用于操作数据库        Connection con=null;        //定义Statement对象,用于操作数据库        Statement stmt =null;        String sql=null;        ResultSet rs=null;        try        {               Class.forName(dbdriver);                      con =DriverManager.getConnection(url);                      stmt =con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);                      sql="select id,name,password,age from person";                      rs=stmt.executeQuery(sql);                      rs.last();                      rs.updateString("name","孟凡龙");                      rs.updateString("password","龙凡孟");                      rs.updateInt("age",21);                      rs.updateRow();                      while(rs.next())                      {                             int id=rs.getInt(1);                             String name=rs.getString(2);                             String password=rs.getString(3);                             int age=rs.getInt(4); %>               <h2>ID:<%=id%>,姓名:<%=name%>,密码:<%=password%>,年龄<%=age%></h2>        <%                      }        }          catch(Exception ex)        {                      }        try        {               rs.close();               stmt.close();               con.close();        }        catch(Exception e)        {} %>以下是数据的插入

<%@page contentType="text/html;charset=gb2312"%> <%@page import="java.sql.*"%> <%        //定义数据库驱动程序        String dbdriver="sun.jdbc.odbc.JdbcOdbcDriver";        //定义数据库连接地址        String url="jdbc:odbc:mldn";        //定义数据库连接对象,用于操作数据库        Connection con=null;        //定义Statement对象,用于操作数据库        Statement stmt =null;        String sql=null;        ResultSet rs=null;        try        {               Class.forName(dbdriver);                      con =DriverManager.getConnection(url);                      /*stmt =con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);*/                      stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);                      sql="select id,name,password,age from person";                      rs=stmt.executeQuery(sql);                      //rs.last();定位到最后                      rs.moveToInsertRow();//定位到插入的行                      rs.updateString("name","孟凡龙先生");                      rs.updateString("password","龙凡孟mm");                      rs.updateInt("age",21);                      //rs.updateRow();                      rs.insertRow();//插入行                      while(rs.next())                      {                             int id=rs.getInt(1);                             String name=rs.getString(2);                             String password=rs.getString(3);                             int age=rs.getInt(4); %>               <h2>ID:<%=id%>,姓名:<%=name%>,密码:<%=password%>,年龄<%=age%></h2>        <%                      }        }        catch(Exception ex)        {                      }        try        {               rs.close();               stmt.close();               con.close();        }        catch(Exception e)        {} %>

批处理语句: