JDBC数据库中表更新

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;

 public class JdbcUpdate {

     /**
      * @param args
      */
     public static void main(String[] args) {
         try {
             //加载驱动
             Class.forName("oracle.jdbc.driver.OracleDriver");
             //获取连接
             Connection con = DriverManager.getConnection("jdbc:oracle:thin:@192.168.16.111:1521:orcl","scott","tiger");
             //获得句柄
             Statement sta = con.createStatement();

             //SQL查询命令
             String sqlFind = "select * from empbak";
             //从emp中复制一个新表为empbak
             String sqlCreTable = "create table empbak as select * from emp";
             //NVL (expr1, expr2)：expr1为NULL，返回expr2；不为NULL，返回expr1。注意两者的类型要一
             String sqlUpdate = "update  empbak set sal = sal+200,comm = nvl(comm+100,100) where sal > (select avg(sal) from empbak )";
             //复制表
             int temp = sta.executeUpdate(sqlCreTable);

             //初始查询
             //发送SQL语句，如果发送的是select,使用executeQuery；如果发送的是INSERT,DELETE,UPDATE，使用executeUpdate
             ResultSet rs1 = sta.executeQuery(sqlFind);
             while(rs1.next()){
                 System.out.print(rs1.getInt("empno")+"\t");
                 System.out.print(rs1.getString("ename")+"\t");
                 System.out.print(rs1.getString("job")+"\t");
                 System.out.print(rs1.getInt("mgr")+"\t");
                 System.out.print(rs1.getString("hiredate")+"\t");
                 System.out.print(rs1.getFloat("sal")+"\t");
                 System.out.print(rs1.getFloat("comm")+"\t");
                 System.out.println();
             }
             System.out.println("********************更新以后*********************");
             int temp1 = sta.executeUpdate(sqlUpdate);
             ResultSet rs = sta.executeQuery(sqlFind);
             while(rs.next()){
                 System.out.print(rs.getInt("empno")+"\t");
                 System.out.print(rs.getString("ename")+"\t");
                 System.out.print(rs.getString("job")+"\t");
                 System.out.print(rs.getInt("mgr")+"\t");
                 System.out.print(rs.getString("hiredate")+"\t");
                 System.out.print(rs.getFloat("sal")+"\t");
                 System.out.print(rs.getFloat("comm")+"\t");
                 System.out.println();
             }
             rs.close();
             sta.close();
             con.close();
         } catch (ClassNotFoundException e) {
             // TODO 自动生成的 catch 块
             e.printStackTrace();
         } catch (SQLException e) {
             // TODO 自动生成的 catch 块
             e.printStackTrace();
         }
     }

 }